System 5000 Service Manual with Schematics Rev R Jan 2008

LIMITED WARRANTY For a period of two years following the date of delivery, CONMED Corporation warrants the CONMED System 5000™ Electrosurgical Generator against any defects in material or workmanship and will repair or replace (at CONMED’s option) the same without charge, provided that routine maintenance as specified in this manual has been performed using replacement parts approved by CONMED. This warranty is void if the product is used in a manner or for purposes other than intended.

© 2008 CONMED Corporation 525 French Road Utica, New York 13502 U.S.A.

U.S. Patent Nos. 4,961,739 - 5,152,762 - 5,626,5756,830,569 - 6,835,082 - 6,875,210 - 6,939,347 D477,082 - D477,408. For Technical Service or Return Authorization Phone: 303-699-7600 / 1-800-552-0138 Extension 5274 Fax 303-699-1628 For Customer Service or to order parts phone: 1-800-448-6506 / 315-797-8375 / Fax 315-735-6235 or contact your CONMED Representative. European Authorized Representative MDSS GmbH Schiffgraben 41 D - 30175 Hannover Germany The revision level of this manual is specified by the highest revision letter found on either the inside front cover or enclosed errata pages (if any).

Manual Number 60-8017-ENG Rev. R 01/08 Unit Serial Number_________________________________

TM

Table of Contents & List of Illustrations

Section

3.0

Title

Page

Theory of Operation ... 3-1

3.1

Mode Descriptions ... 3-1

3.2

System Overview ... 3-2

3.3

Optional System Configurations ... 3-7

3.1.1 3.1.2 3.1.3 3.1.4 3.2.1 3.2.2 3.2.3 3.2.4 3.2.5 3.2.6 3.2.7 3.2.8 3.2.9 3.2.10 3.2.11

4.0

Cut Major Modes ...3-1 COAG Major Modes ...3-1 Bipolar Major Modes ...3-2 Advanced Specialty Modes ...3-2

High Voltage Power Supply (HVPS) ...3-3 RF Amplifier and Transformer ...3-4 Electrosurgical Outputs ...3-5 Activation Command Sensing ...3-5 Automatic Return Monitor (A.R.M.™) ...3-5 Low Voltage Power Sources ...3-5 System Controllers and Monitor ...3-5 Low Voltage Power Monitoring ...3-6 Operator Control Panel ...3-6 Activation Tones...3-6 Activation Relay Connector...3-7

Maintenance ... 4-1

4.1 4.2 4.3

General Maintenance Information... 4-1 Maintenance Personnel... 4-1 Assembly Breakdown/Parts Access ... 4-1

4.4 4.5

Cleaning ... 4-8 Periodic Inspection ... 4-8

4.7

System Calibration ... 4-14

4.3.1 4.3.2 4.3.3 4.3.4 4.3.5 4.3.6 4.3.7 4.3.8 4.3.9 4.3.10 4.3.11 4.3.12

4.6 4.6.1 4.6.2 4.6.3 4.6.4 4.6.5 4.6.7 4.7.1 4.7.2 4.7.3 4.7.4

Top Cover Removal and Replacement ...4-1 Bezel Removal and Replacement ...4-2 Processor Board Removal and Replacement ...4-3 Transformer Board Removal and Replacement ...4-3 Output Board Removal and Replacement ...4-4 RF Amp Board Removal and Replacement ...4-4 Low Voltage Power Supply Module Removal and Replacement...4-5 High Voltage Power Supply Removal and Replacement ...4-6 Rear Panel with Board Removal and Replacement ...4-6 Back Panel Board Removal and Replacement ...4-7 Display Boards Removal and Replacement ...4-7 Power Transistor Replacement...4-8

Periodic Performance Testing ...4-9 Chassis Ground Integrity...4-9 Displays, Alarms and Commands ...4-9 Output Power ...4-9 RF Leakage Measurement ...4-10 Line Frequency Leakage ...4-12 Output Coupling Capacitor Check ...4-14 Calibration Preliminaries ...4-14 Selecting the Mode to Calibrate ...4-16 Calibrating a Monopolar Mode ...4-16 Calibrating Bipolar Modes ...4-16

Section

Title

Page

4.7.5 4.7.6

Calibrating A.R.M.™ ...4-16 Completing Calibration ...4-17

4.8.1 4.8.2

Last Fault Code Retrieval ...4-17 Clearing Last Fault Codes ...4-18

4.8

Last Fault Code Retrieval and Clear ... 4-17

4.9 4.10 4.11 4.12

Displaying Optional System Configuration ... 4-18 DACview ... 4-20 Setting the Clock ... 4-21 Troubleshooting ... 4-21

4.13 4.14

Parts Ordering Information ... 4-24 Fault Codes ... 4-24

4.12.1

Figure/Title

HVPS Troubleshooting Hints ...4-23

Page

Figure 3.1 RF Controller Block Diagram ...3-3 Figure 3.2 System Block Diagram ...3-4 Figure 4.1 Calibration Procedure Flow Chart ...4-15 Figure 4.2 DIP Switch Positions ...4-18 Figure 4.3 Module Diagram ... A-1 Figure 4.4 A12 Back Panel PCB Assembly ... A-4 Figure 4.5 A9 RF Power Supply PCB Assembly ... A-7 Figure 4.6 A7 RF Transformer PCB Assembly ... A-9 Figure 4.7 A6 RF Amplifier PCB Assembly ... A-11 Figure 4.8 A5 RF Output PCB Assembly ... A-14 Figure 4.9 A4 Microcontroller PCB Assembly... A-19 Figure 4.10 A2 Display Controller PCB Assembly ... A-21 Figure 4.11 A3 Display Light Panel PCB Assembly ... A-23 Table 4.1 Monopolar Cut Mode RF Output Power Accuracy ...4-9 Table 4.2 Monopolar Coag Mode RF Output Power Accuracy ...4-10 Table 4.3 Bipolar Mode RF Output Power Accuracy ...4-10 Table 4.4 Allowable RF Leakage Current to Ground ...4-11 Table 4.5 Allowable RF Leakage Current - Inactive Monopolar Outputs ...4-12 Table 4.6 Allowable RF Leakage Current - Inactive Bipolar Outputs ...4-12 Table 4.7 Line Frequency Allowable Leakage - Inactive...4-12 Table 4.8 Line Frequency Allowable Leakage - Active ...4-13 Table 4.9 DIP Switch Settings ...4-19 Table 4.10 DACview Channels ...4-20 Table 4.11 Troubleshooting ...4-21 Table 4.12 Fault Codes ...4-25 Schematic 4.1 Interconnect Diagram ... A-2 Schematic 4.2 A12 Back Panel PCB ... A-3 Schematic 4.3a A9 RF Power Supply PCB - Power Factor Controller... A-5 Schematic 4.3b A9 RF Power Supply PCB - Forward Converter ... A-6 Schematic 4.4 A7 RF Transformer PCB ... A-8 Schematic 4.5 A6 RF Amplifier PCB ... A-10 Schematic 4.6a A5 RF Output PCB - Interconnect & Switching Isolation... A-12 Schematic 4.6b A5 RF Output PCB - Relays & Sensing ... A-13 Schematic 4.7a A4 Microcontroller PCB - Controller Interconnect ... A-15 Schematic 4.7b A4 Microcontroller PCB - Microcontroller ... A-16 Schematic 4.7c A4 Microcontroller PCB - RF Controller ... A-17 Schematic 4.7d A4 Microcontroller PCB - RF Monitor ... A-18 Schematic 4.8 A2 Display Controller PCB ... A-20 Schematic 4.9 A3 Display Light Panel PCB ... A-22

TM

Theory of Operation Section 3.0

System 5000™ functions and essential circuit information are provided in this section. This section begins with a description of the key parameters for each mode. This is followed by an overview of how the system functions and some key operational information for the modules within the system.

3.1

Mode Descriptions

The key functional parameters for each mode are presented here. Nominal mode specifications are provided in section 1.2.11. 3.1.1

Cut Major Modes

Major mode

Minor Mode

RF frequency

Modulation: Number of Pulses, Time on/off

Modulation: Frequency & period

CUT

PURE

391 KHz

None

None

BLEND 1

391 KHz

16 pulses

20 KHz

40µs/10µs

50µs

11 pulses

20 KHz

28µs/23µs

50µs

10 pulses

20 KHz

26µs/24µs

50µs

BLEND 2 BLEND 3

391 KHz 391 KHz

Activation of Pulse Cut will make the selected cut mode, Pure Cut, Blend 1, Blend 2, or Blend 3 active for 70 milliseconds every 600 milliseconds. NOTE: The low duty cycle of Pulsed Cut mode makes the average power very low – about 12%– when compared with the power displayed on the 3.1.2

front panel. The period is also long causing most ESU analyzers to provide erratic or erroneous readings. Correct power can be verified by measuring the peak to peak current and comparing the value with the current measured in the non-pulsed mode.

COAG Major Modes

Major mode

Minor Mode

RF frequency

COAG

PINPOINT

391 KHz

Modulation: Number of Pulses, Time on/off

Modulation: Frequency & period

4 pulses

20 KHz

10µs/40µs

50µs

STANDARD

562 KHz

Single pulse

39 KHz

SPRAY

562 KHz

Single pulse

19 KHz

Activation of Pulse Coag will make the selected coag mode, either Standard or Spray, active for 2.5 milliseconds every 5 milliseconds. Displayed power setting will represent the average power being delivered which is approximately half the power delivered during the pulses.

Standard and Spray Coag modes are fundamentally different from the Cut modes in that the resonant circuit of the RF Amplifier and Transformer combination is excited by the energy of a single pulse, causing the resonant circuit to ring until the energy is dissipated. Circuitry in the amplifier

3-1

provides further damping to dissipate the energy more quickly to minimize RF leakage effects. Spray Coag provides the maximum open circuit voltage for which the system is rated. 3.1.3

Bipolar Major Modes

Major mode

Minor Mode

RF frequency

Modulation: Number of Pulses, Time on/off

Modulation: Frequency & period

BIPOLAR

MACRO

391 KHz

None

None

MICRO

391 KHz

None

None

3.1.4

Advanced Specialty Modes

Specialty Mode

Effect

General

Normal open surgery mode – Parameters noted above.

Fluids

Temporarily increases power upon activation for faster initiation. Duration and power increase vary with mode and power setting

Lap

Limits maximum peak voltage for safer laparoscopic surgery. This action does affect the load curves when in high impedance tissue, or using normally high voltage modes.

3.2

System Overview

Mains power is converted to electrosurgical output power through the High Voltage Power Supply (HVPS), the RF Amplifier, and the Transformer and Output sections of the system. Mains power is converted to high voltage direct current power in the HVPS to supply the RF Amplifier. This universal input power factor corrected, single output, switch mode power supply is adjustable under software control with 10-bit resolution. The HVPS output and power factor correction sections of the HVPS can be enabled or disabled under software control. The HVPS uses a current mode two-switch forward converter topology with short circuit protection and over voltage limiting. Pulses generated in the RF Controller are amplified to electrosurgical power and voltage levels in the RF Amplifier and Transformer portions of the power train. The RF Amplifier and Transformer form a resonant switched mode amplifier with multiple outputs that are selected on a mode-bymode basis using relays on the primary and secondary side of the transformers. One transformer is used for monopolar outputs, while the other transformer is for the bipolar output. Electrosurgical power flows from the RF Amplifier and Transformer sections to the Output section where the power is switched to the specific electrosurgical outputs. The Output section also has circuitry to detect activations from accessories

3-2

and the circuitry to perform the Automatic Return Monitor (A.R.M.™) function to ensure the integrity of the dispersive electrode connection. The power section also includes a number of output voltage and current sensors that are used by the RF Controller for control of power delivery and by the Monitor to detect errant output conditions. The RF Controller is a Digital Signal Processor (DSP) that generates an RF Amplifier drive signal based upon measured parameters compared with settings-based parameters. The pulse train sequence is a settings-based parameter that is dependent on the selected mode. Target power, current limit, voltage limit, and impedance thresholds are all settings-based parameters derived from a load curve that is specific to the front panel power setting. The RF Controller samples electrosurgical output voltage and output current from sensors over 450,000 times per second and uses these sampled values to calculate output power and sensed impedance. The output power, output current, output voltage, and sensed impedance are compared with corresponding settingsbased parameters of target power, current limit, voltage limit, and impedance threshold; respectively; and the RF Controller adjusts the width of individual pulses within each mode-based pulse train sequence in a closed-loop fashion to control corresponding output power. The RF Controller also adjusts the HVPS output more slowly, allowing adjustment of the RF Amplifier drive pulses

Power setting – watts displayed on the front panel

200 180

Desired Power

160 140

180

120 100 80

90

60 40 20

35

0 0

500

1000

1500

Voltage sampled 450,000 times per second

Calculate measured resistance

Current sampled 450,000 times per second

Calculate measured power

2000

Compare

Adjust output waveform (power)

Patient

Measured Power

Figure 3.1 RF Controller Block Diagram to optimize the electrosurgical output waveform. Finally, the RF Controller minimizes RF leakage currents using the CONMED Leakage Abatement System (CLAS™), which imposes a duty cycle on the electrosurgical output when sensed impedance and output voltage exceed settings-based impedance thresholds and voltage limits in the Coag modes. The RF Monitor is also a DSP, but it is used to monitor the system for a variety of conditions that could lead to safety problems, including: • The Monitor has independent sensors for output voltage and current, which it uses to calculate power for comparison with the power that the RF Controller senses and for comparison with the generator power setting. • To ensure that the correct outputs are activated, the Monitor also independently senses current at each of the outputs, looking for current flow that would indicate electrosurgical power at outputs other than the selected output. • The Monitor senses the voltage at the output of the HVPS to ensure that it is reasonable for the power setting. • The Monitor senses the audio output to ensure that a tone occurs whenever electrosurgical outputs are active. • The RF Amplifier drive signal is sensed by the Monitor to detect improper frequencies or improper pulse sequences for the selected mode.

• The Monitor independently compares the activation signal with that seen by the System Controller to ensure that the activation signal is consistent. The Monitor has the capability to independently disable the electrosurgical output if a problem is detected. The System Controller provides the primary control interface to the user and other outside systems, including the serial interface, the activation relay, tone generation, and displays. Finally, the Display accepts all user input and provides all user feedback. The Display is controlled by the System Controller through a serial interface and illuminates the LED display elements in a time division multiplexed fashion; the illuminated LED display elements are actually on less than half the time. The Display also provides for user input through the buttons on the control panel, including switch de-bouncing and conditioning. Figure 3.2 illustrates the key elements of the system in block diagram form. 3.2.1

High Voltage Power Supply (HVPS)

The HVPS is comprised of a Power Factor Control (PFC) section and a Forward Converter (FC) section. The PFC converts Mains power to approximately 400 volts using techniques that ensure the mains current into the supply is sinusoidal and in phase with the mains voltage. By doing so, RMS current and harmonic distortion are reduced. The Forward Converter then

3-3

Keyboard Modes / Power

Activation Request

Indicators: Power, Mode, & bipolar current

Displays

Activation Relay Connector Serial Interface

ACT RLY RS232

SPI

Real Time Clock (5K)

Connector

AL TONE ACT TONE BIP TONE

System Controller

RF Output Board

VARM

Mon

RLY DRV

Bip

RF Transformer Board

RF INH PFC EN RF BP IS RF BP VS

Mon

RF MP IS RF MP VS

Host Bus

Patient

RF Amp

WFORM

RF Controller

Tone Mon

RFHVSup

DAMP CNTL HV Power Supply

HV SET WF EN /HV EN

RF Monitor

MRF MP ISN MRF MP VSN

M HVDC MRF BP ISN MRF BP VSN

MRF H1 SN MRF H2 SN MRF FT SN

Figure 3.2 System Block Diagram converts the PFC output to an adjustable DC voltage for use by the RF amplifier. The System Controller can enable or disable the PFC section of the HVPS. The PFC is normally enabled during operation to ensure a resistive load is presented to the Mains. The Forward Converter is a switch-mode power converter that adjusts its operating frequency between 25KHz and 100KHz to ensure proper resolution for the commanded output voltage. Isolation between Mains power and the

3-4

HVPS output occurs in the Forward Converter. Forward Converter output voltage is set from the RF Controller by the /HVSET signal. The RF Monitor enables the output of the HVPS. The forward converter includes current limiting on the output and has provisions to shutdown when the output of the Low Voltage Supply exceeds limits. 3.2.2

RF Amplifier and Transformer

The RF Amplifier and Transformer portions use a switch-mode resonant amplifier to convert the power from the HVPS to the RF energy neces-

sary for electrosurgery. One may think of the amplifier as a high-speed switch that pulses current through a resonant circuit, which is formed by the monopolar or bipolar transformer together with capacitors and inductors connected to the transformer primary and secondary windings. Two Metal-Oxide-Semiconductor Field Effect Transistors (MOSFETs) are connected in a parallel fashion provide the switching. The pulses to drive the gates on the MOSFETs in this arrangement come from the RF Controller. Adjusting the width of the drive pulses regulates the output power in this arrangement; as the pulses become longer, the output power increases. As noted in the RF Controller discussion, the RF Controller compares the output power with the desired power and adjusts the pulse width to minimize the difference. A drive of several pulses at a frequency that closely matches the resonant frequency of the amplifier characterize Cut, Blend, and Pinpoint modes, and the output pulses substantially correspond to the drive. Spray and Standard Coag modes, however, are characterized by pulses that occur less frequently where the amplifier is allowed to “ring” at its resonant frequency. A damping capability is provided to enhance the surgical effect by damping the ringing effect for each drive pulse.

The Monitor utilizes sensors implemented on each electrosurgical output to determine whether current is flowing only to the correct outputs. In the event that current flows in an output that is not selected, the Monitor can independently disable RF. The System 5000™ output panel connectors are illuminated to aid visibility in low lighting situations. This illumination is provided by a single LED on the display board that is distributed to the receptacles through a fiber-optic bundle. 3.2.4

Activation Command Sensing

Each of the Hand Controlled Accessory receptacles incorporate inputs that are used to sense an activation command from the user. Each monopolar hand controlled accessory receptacle has an input for cut and an input for coag. The bipolar receptacle incorporates a single activation input. Each of these five inputs is isolated from the other electrosurgical outputs and from other low-level circuitry in the system. All are powered by a multiple output isolated power supply. The footswitch activation inputs on the back panel are configured in a similar way and share one of the isolated power supply outputs. 3.2.5

Automatic Return Monitor (A.R.M.™)

Because the transformer windings and the resonant frequencies between the cut and coag modes are different, a method of selecting resonating components is implemented using relays. These relays switch in the relevant components for the selected mode based upon commands from the System Controller.

The patient return connector interfaces to single and dual dispersive electrodes using a two-pin connector. A.R.M.™ circuitry uses an actively driven impedance measurement circuit, which allows the System Controller to detect the type of dispersive electrode connected and verify its integrity.

A Balun transformer is provided for the monopolar modes to reduce differences between the source and return currents, thus reducing RF leakage.

3.2.6

Finally, the RF Amplifier and Transformer provide capabilities for sensing RF output current and voltage. These are transformer-isolated representations of the current flowing in the leads and the voltage across the output, which are supplied to the RF Controller and the Monitor processors. 3.2.3

Electrosurgical Outputs

Relays are provided to isolate electrosurgical outputs and select which outputs are active. The System Controller selects the appropriate output relays based upon activation command inputs.

Low Voltage Power Sources

The low voltage power supply is a medical-grade universal input offline triple output switching power supply. The power supply is active anytime Mains power is connected to the unit with the Mains power switch turned on. 3.2.7

System Controllers and Monitor

Three processors are used for system interface & control, RF control, and system monitor functions. The ESU control section consists of dual channel architecture with two independent channels where one is used exclusively for RF output control and the other is used for safety monitoring. All three of these processors are located on

3-5

the Control board, along with circuitry to isolate them from RF noise. • System Controller (System Microcontroller): A dedicated microcontroller that handles the entire user interface, Serial Interface, real time clock functions, and enables/disables the power factor control section of the HVPS using the PFC_EN signal. The System Controller can also disable the signal used to drive the RF Amplifier and can terminate RF drive at any time without interaction from either the RF Controller or the Monitor. The System Controller is comprised of an standard architecture microprocessor together with Field Programmable Gate Array (FPGA), which provides interface logic to a variety of signals, a 3.68MHz oscillator, independent voltage regulators, a processor supervisory reset circuit, and other interface logic. • RF Controller: A DSP that is dedicated to the output and control of RF power using the DAMPCNTRL and RF_DRV outputs. To reduce the effects on the microprocessor circuits on the Controller board from RF noise at the output, DAMPCNTRL and RF_DRV are both differential mode signals running between the RF Controller and the RF Amplifier. The RF Controller is capable of disabling RF output power and putting the system into a safe state without any interaction from the Monitor or the System Controller. The RF Controller independently monitors the RF output voltage and current for control purposes through several scaled inputs. It sets the output voltage of the HVPS using the HV_SET signal dependent on the output Mode and power selected. The RF Controller controls the fan based upon temperature measurements supplied from the RF Amplifier through the System Controller. The RF Controller is comprised of a DSP, together with circuitry necessary for converting the signals used for control purposes between analog and digital form, independent voltage regulators, and other interface logic. • RF Monitor: A DSP that is dedicated to safety monitoring activities. The Monitor is capable of disabling RF output power and putting the system into a safe state without any interaction from the RF Controller or the System Controller. To ensure that the Monitor can correctly perform its function, the Monitor is

3-6

resistively isolated from the other two processors and has independent voltage regulation. The RF Monitor independently monitors a variety of inputs to detect safety problems and has control of disable signals for both the HVPS and RF Amplifier drive. The Monitor is comprised of the same DSP as the RF Controller, together with circuitry necessary for converting the signals monitored between analog and digital form, an FPGA to provide interface logic, independent voltage regulators, isolation resistors and other interface logic. 3.2.8

Low Voltage Power Monitoring

The low voltage power supply is monitored in hardware and resets the processors if it is out of range. The microprocessor supervisory device on the Controller board monitors +5V and +3.3V and will reset the system should the levels drop approximately 0.3V. The Controller assembly has the circuit that will reset the system should the 3.3V supply exceed 3.6V. The High Voltage power supply has a circuit that will inhibit HVDC should the +5V supply exceed 5.7V. 3.2.9

Operator Control Panel

Keyboard: The main operator input device for choosing operating modes and settings is the membrane keyboard panel. Tactile-feedback mechanical switches allow the operator to set modes and adjust power settings. Display Panel: Consists of 7-segment displays, discrete dual colored LED’s, and light bars that will display all controls and settings. LED display elements are illuminated in a time division multiplexed fashion; the illuminated LED display elements are actually on less than half the time. Bipolar Current Meter: The System 5000™ has a bargraph display that provides an indication of measured bipolar impedance. A special tone works in conjunction with this bargraph to indicate when the measured bipolar impedance exceeds a particular limit. 3.2.10 Activation Tones Tone is generated for all activation requests, fault detection and changes made on the Control Panel. The System Controller generates the tone signal (ACT_TONE, AL_TONE, & BP_TONE), which is amplified by a driver on the Backpanel PCB Assembly. The activation tone and bipolar tone

are individually adjustable, but alarm tones are not adjustable and are set to generate tone greater than 65 dB. Circuitry on the Backpanel PCB permits the Monitor to verify the oscillation from voltage measured across the speaker, which provides confirmation that the speaker is indeed generating audible tones during activation. RF output is inhibited should the speaker drive current be absent or too low. 3.2.11 Activation Relay Connector There is an Accessory Relay Connector, which provides a relay closure (SPST switch) that may be used for activating external accessories such as smoke evacuation units.

3.3

Optional System Configurations

An eight-position configuration dipswitch (S2), located on the Controller PCB Assembly (A4) allows a qualified service technician to change some of the factory default settings. With the exception of the DACview switch, the configuration dipswitch settings are only detected when power is initialized, so any changes to the switch positions must be made with the main power off. Each switch is OFF in the Down position and ON in the UP position. The system detects changes in the DACview switch while power is on, so it is treated differently. Relevant information for the configuration dipswitches appears in Section 4.9.

3-7

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3-8

TM

Maintenance Section 4.0

This section contains information useful in the maintenance and repair of the System 5000™. WARNING: High voltages are present at the connections and within the System 5000™. Maintenance personnel should take precautions to protect themselves. Read the safety summary in Section 1.1.4 before working on the ESU.

4.1

4.3.1

Top Cover Removal and Replacement

Top Removal: 1) Remove the two screws located on rear of unit as shown. 2) Pull back and up to remove top. Cover Screws

General Maintenance Information

Cover Screws

Although the System 5000™ has been designed and manufactured to high industry standards, it is recommended that periodic inspection and performance testing be performed to ensure continual safe and effective operation. Ease of maintenance was a primary consideration in the design of the System 5000™. Maintenance features of this unit include microprocessor aided troubleshooting aids and push button calibration, built in fault detection, circuit protection, and easy access to circuitry while the unit is operational. These features, coupled with the warranty, local support, loaner equipment, factory support, toll free phone service to the factory and available factory training ensure the user of a minimal maintenance effort with extensive support available.

4.2

Maintenance Personnel

Only qualified biomedical engineers should perform service on the System 5000™. Refer all servicing to a qualified biomedical engineer. If necessary, your CONMED sales representative will be happy to assist you in getting your equipment serviced.

4.3

Cover Screws

Side Clips

Assembly Breakdown/Parts Access

CAUTION: This device contains components that can be damaged by static electricity. Proper handling by grounding of personnel during servicing is mandatory. Following are instructions for unit disassembly and reassembly instructions.

4-1

Top Replacement: 1) Place top approximately ¾” from front bezel on top of unit. 2) Press forward, aligning lip of front bezel with groove in top and side clips with tabs on casting. 3) Re-install screws.

3) Unlatch display ribbon cable, dispersive electrode connector, ReadiPlug™ cable connector and two ground connectors. 4) In most situations, it is not necessary to remove the four power switch connectors. The bezel can be rotated off to the right side for output board removal. To fully remove the bezel, these connectors must be disconnected. AC Power Switch

Slide top forward.

White

Blue

4.3.2

Black

Brown

Bezel Removal and Replacement

Bezel Removal: 1) Remove Top. 2) Remove two flat-head screws on side of bezel and two pan-head screws on bottom of bezel.

Bezel Replacement: 1) Connect power switch connectors as shown, if required. 2) Connect dispersive electrode connector and ReadiPlug™ cable connector prior to sliding bezel into place. 3) Slide bezel into unit. As shown in figure, the output board insulator is positioned between the sheet metal base and the Output Board.

Insulating Sheet

4) Reconnect cables and replace and tighten screws. Spring contacts are exposed and can be deformed, causing erratic operation. Handle with care.

4-2

4.3.3 Processor Board Removal and Replacement Processor Board Removal: 1) Remove Top. 2) Loosen the two screws holding the board to slots in the brackets. 3) Unlatch the ribbon cable going to the display. 4) Pull board up and out of unit.

3) Unlatch the ribbon cable and power cable on the top of the board. 4) Pull board towards inside of unit so screws line up with keyholes, then up and out of unit. The power cable to RF Amp must be unplugged to completely remove transformer board. Processor Board Replacement: 1) Align board into the two slots of the brackets attached to the heatsinks. Align with connector on Output Board and press firmly to engage it fully. Tighten the two screws. 4.3.4 Transformer Board Removal and Replacement

Transformer Board Replacement: 1) Reverse board removal operation. NOTE: When servicing unit, board can be supported in heatsink as shown. This will provide access to the lower boards while the unit is functional.

Transformer Board Removal: 1) Remove Top. 2) Loosen the two screws mounting the board to the keyhole slots on standoffs and two screws mounting the board to the heatsink.

Align slot in board with rib on heatsink.

Route cable through slot.

4-3

4.3.5 Output Board Removal and Replacement

4.3.6 RF Amp Board Removal and Replacement

Output Board Removal:

RF Amp Board Removal:

1) Remove Top, Bezel and Processor Board.

1) Remove Top, Bezel and Transformer Board.

Note: It is not necessary to remove power switch connections from the bezel.

2) Remove the four screws that attach the heatsink to the sheet metal chassis. One for the handle, one on the back panel, and two below the heatsink. Remove the two screws that attach the board to the sheet metal chassis as shown. Note: These screws are in holes, not slots.

2) Remove the seven cables along the rear side of the board and the three screws shown.

3) Unlatch three cables – two cables from the RF Output Board and a cable from the RF Power Supply Board. 4) Loosen the smaller hex standoff. Spring contacts are exposed and can be deformed, causing erratic operation. Handle with care.

5) Slide RF Amp Board with heatsink off the base as shown.

Output Board Replacement: 1) Prior to replacing board, assure that the insulator sheet is positioned properly as shown.

Note: The insulator sheet provides an important dielectric barrier. For safe operation, position over center standoff as shown.

2) Replace board on standoffs. 3) Route cables as they were prior to removal and connect them back to their proper connectors. 4) Replace and tighten the three screws.

4-4

RF Amp Board Replacement: 1) Slide board with heatsink back into its previous position on the sheet metal chassis. The heatsink has two pins that align into holes on the sheet metal chassis. 2) Tighten hex standoff onto board. It provides an electrical ground to Transformer Board. 3) Reinstall and tighten the six screws and latch the three cables.

4.3.7 Low Voltage Power Supply Module Removal and Replacement NOTE: This module is not user serviceable at the component level. If faulty, the entire circuit board must be replaced. Replacements are available from CONMED Customer Service. Do not discard the module cover, mounting plate and hardware; the replacement part includes only the circuit board. Low Voltage Power Supply Module Removal: 1) Remove Top Cover. 2) Loosen four screws located in slots and unlatch the two cables. 3) Slide Low Voltage Power Supply Module inward off the slots, then upward to remove.

Circuit Board

NOTE: When servicing unit, board can be held in heatsink as shown. This will provide access to the lower boards while the unit is functioning.

4) Remove the cover by removing four screws. Then remove the four standoffs to separate the Low Voltage Power Supply from its mounting plate.

Low Voltage Power Supply Module Replacement: 1) Replace Low Voltage Power Supply on mounting plate, fasten standoffs, replace cover and tighten screws. 2) Place Low Voltage Power Supply Module into unit on standoffs. Tighten the loose screws and latch the two connectors.

4-5

4.3.8 High Voltage Power Supply Removal and Replacement High Voltage Power Supply Board Removal: 1) Remove Top Cover. Position Transformer Board in its servicing position to gain access to screws. If desired, remove the Low Voltage Power Supply. 2) Unlatch the Mains Power Cable, RF Amp Cable, and Output Board Ribbon Cable. 3) Loosen the two screws holding the edge of the board to the chassis.

Note: Observe the position of the insulating sheet under the High Voltage Power Supply. If the insulating sheet is removed, replace it as shown. It is important to maintain its function as a dielectric barrier and to protect the ribbon cable from the leads of the High Voltage Power Supply Board.

Insulating Sheet

4) Remove the screw to the handle, the screw to the back panel, the two screws on the bottom of the heatsink and slide out the heatsink with the board attached.

4.3.9 Rear Panel with Board Removal and Replacement Rear Panel with Back Panel Board Removal:

High Voltage Power Supply Board Replacement:

1) Remove Top Cover. 2) Unlatch the Ribbon Cable. 3) Remove the four screws on the bottom of the Rear Panel, and the three screws shown on the Rear Panel.

1) Slide board with heatsink back into its previous position on the sheet metal chassis. The heatsink has two pins that align into holes on the sheet metal chassis. 2) Reinstall and tighten the six screws and latch the three cables.

4) Slide the Rear Panel with Back Panel Board back toward the handle and then down to remove.

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Rear Panel with Back Panel Board Replacement: 1) Slide Rear Panel with Back Panel Board back into place on the unit. 2) Reinstall and tighten the seven screws and latch the ribbon cable. 4.3.10 Back Panel Board Removal and Replacement Back Panel Board Removal: 1) Remove Top Cover and Rear Panel. 2) Unlatch the Activation Relay and Fan connectors. 3) Remove the four screws for the foot switch connectors, the two nuts on the volume potentiometers and the two screws to the rear panel sheet metal standoffs. This will free the Back Panel Board from the Rear Panel. 7) Remove the Display Controller Board by separating it from the display board and pulling it off the studs. There are two 40-pin connectors between these boards that may require separation by prying with a blunt object. 8) Remove the five hex standoffs and pull the Display board off the studs. Display Boards Replacement: Back Panel Board Replacement: 1) Install Back Panel Board to Rear Panel 2) Reinstall and tighten the six screws, two nuts. Latch the RSA and fan cables.

Caution: When reinstalling Boards and display shield, take care to route fiber optic cable as shown to avoid crimping it between the bezel and display shield.

4.3.11 Display Boards Removal and Replacement Display Boards Removal: 1) Remove the Top Cover and Bezel. 2) Remove 8 nuts and two ground cables on the back of the display shield. 3) Disconnect the ribbon cable and remove the sheet metal display shield. 4) Slide the round spacers off their studs. 5) Disconnect the flex circuit connector. Caution: The flex circuit has a short service loop and is fragile; handle with care. 6) Pull to disconnect the fiber optic cable from LED. Caution: The fiber optic cable is fragile; handle with care.

1) Reinstall boards in the reverse order described above. Latch the flex circuit connector, press fiber optic cable onto the LED and press the Display Controller Board firmly into place on the two 40 pin connectors.

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4.3.12 Power Transistor Replacement Caution: This device contains components that can be damaged by static electricity. Proper handling by grounding of personnel during servicing is mandatory. All RF Power Supply and RF Amp components mounted to the heatsink may be replaced. Use only components supplied by CONMED. Follow these instructions for replacement: 1) No thermal compound is necessary, but the mating surfaces of the transistor, insulator pad and surface of casting should be clean. Always replace the insulator pad associated with the transistor. Always fasten or clamp the part to the heat sink surface prior to soldering it to the board. This will assure good thermal contact is maintained.

4) When installing the RF Power Supply transistors or diodes, replace components as shown and ensure the insulating tube is installed over the clip. Locate the part on the clip so that the bend of the clip is approximately centered on the body of the part as shown. Tighten screw to 8-10 in-lbs. When tightening screw, hold the clip to prevent it from rotating. Clamp the part to the heatsink surface prior to soldering to the board.

2) In order to maintain alignment with the heat sink surface, the leads of these parts have been bent to the proper shape. They should be purchased from CONMED with bent leads. 3) When installing the RF Amp transistors or diodes, be sure to orient the Bellville washer as shown with the convex surface next to the head of the screw. Tighten screws to 5-7 inch pounds.

4.4

Cleaning

The interior of the unit may be vacuumed or blown out as required. The exterior of the unit may be cleaned by wiping it with a cloth that has been dampened (not dripping) with a mild detergent such as Windex® or Formula 409®. Windex® is a registered trademark of the S.C. Johnson Company. Formula 409® is a registered trademark of the Clorox Company.

4.5

Periodic Inspection

The System 5000™ should be visually inspected at least every six months. This inspection should include checks for the following: 1) Damage to the power cord and plug. 2) The proper mating and absence of damage to the accessory connectors. 3) Any obvious external or internal damage to the unit. 4) An accumulation of lint or debris within the unit or heatsink. 5) Control Panel cuts, punctures, or dents.

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