Model 950 Service Guide Rev 3

Safety Precautions when Operating the Generator The safe and effective use of electrosurgery depends to a large degree on factors solely under the control of the operator. There is no substitute for a properly trained and vigilant medical staff. It is important that they read, understand, and follow the operating instructions supplied with this electrosurgical equipment. To promote the safe use of the Aaron 950 Electrosurgical Generator, please refer to the User’s Guide for standard operating precautions.

Applicable Safety Standards CSA C22.2, NO. 601.1 – M90 UL 2601 – 1 – UL IEC 60601 – 2 – 2 (1998 – 09) CLASS 1 EQUIPMENT, TYPE BF CENELEC EN 60601 – 1 – 2 FCC PART 15, CLASS A IEC 60601-1 2nd Edition (1988)

Conventions Used in this Guide WARNING: Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION: Indicates a hazardous situation which, if not avoided, may result in minor or moderate injury.

NOTICE: Indicates an operating tip, a maintenance suggestion, or a hazard that may result in product damage.

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TABLE OF CONTENTS Preface ...ii Equipment Covered in this Manual ...ii For Information Call ...ii Safety Precautions when Operating the Generator ...iii Applicable Safety Standards ...iii Conventions Used in this Guide ...iii The Aaron 950 Electrosurgical Generator ...1-1 Functional Description ...1-2 Unit Description ...1-3 Safety Precautions when Repairing the Generator ...1-3 General Warnings, Cautions, and Notices ...1-3 Active Accessories ...1-4 Fire / Explosion Hazards ...1-4 Generator Electric Shock Hazards ...1-5 Servicing ...1-5 Cleaning ...1-5 Controls, Indicators, and Receptacles ...2-1 Front Panels ...2-2 Controls and Indicators Overview ...2-3 Cut, Blend, and Coag Controls ...2-5 Fulguration, Bipolar, and Preset Controls ...2-6 Indicators and Receptacles ...2-7 Symbols on the Front Panel ...2-8 Rear and Side Panels ...2-9 Symbols on the Rear Panel ...2-9 Symbols on the Side Panel ...2-9 Technical Specifications ...3-1 Performance Characteristics ...3-2 Input Power ...3-2 Duty Cycle ...3-2 Dimensions and Weight ...3-2 Operating Parameters ...3-2 Transport and Storage ...3-2 Audio Volume ...3-3 Low Frequency (50-60 Hz) Leakage Current ...3-3 High Frequency (RF) Leakage Current ...3-3 Standards and IEC Classifications ...3-4 Class I Equipment (IEC 60601-1) ...3-4 Type BF Equipment (IEC 60601-1) / Defibrillator Proof ...3-4 Drip Proof (IEC 60601-2-2) ...3-4 Electromagnetic Interference ...3-4 Electromagnetic Compatibility (IEC 60601-1-2 and IEC 60601-2-2) ...3-4 Voltage Transients (Emergency Generator Mains Transfer) ...3-4 Output Power Characteristics ...3-5 Maximum Output for Bipolar and Monopolar ...3-5 Output Power Curves ...3-6 Monopolar Cut Curves ...3-6 Additional Monopolar Output Power Curves ...3-7 Bipolar Curves ...3-10 Reference Output Waveforms ...3-11

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Theory of Operation ...4-1 Block Diagram ...4-2 Functional Overview of Key Circuits ...4-2 High Voltage DC Supply ...4-2 Low Voltage DC Supply (9VDC and 5VDC) ...4-2 DC Supply Check Circuit ...4-2 Temperature Sensing Circuit (TEMP_SEN) ...4-3 Activation Request Sensing Circuit (Hand and Foot) ...4-3 Up Sensing Circuit (REQ_UP) ...4-3 Down Sensing Circuit (REQ_DOWN) ...4-3 Patient Plate Sensing Circuit (PAD_SNS_ERROR) ...4-4 Front Panel Controls ...4-4 System Logic ...4-4 Speaker Circuit (AUD_DRV) ...4-4 Front Panel Display (Indicators) ...4-5 Digital PWM Circuit ...4-5 RF Drive (RF_DRV) ...4-5 RF Amplifier Circuit ...4-5 TAP Select Circuit (TAP_SEL) ...4-5 Ground Select Circuit (GND_SEL) ...4-5 Output Select Circuit (OUT_SEL) ...4-5 Aaron 950 Control Signal Inputs and Outputs ...4-6 Operating the Aaron 950 ...5-1 Inspecting the Generator and Accessories ...5-2 Service Personnel Safety ...5-2 Installation and Placement ...5-4 Functional (Operational) Checks ...5-5 How to Set Up and Start the Aaron 950 Unit ...5-5 How to Check the Unit Operation with a Footswitch ...5-5 How to Check the Monopolar Modes with a Handpiece ...5-5 How to Check the Patient Plate Alarm Function ...5-6 Unit Operation ...5-6 Maintenance ...6-1 Cleaning the Unit ...6-2 Performing Periodic Inspection ...6-2 Replacing Fuses ...6-3 Fuse Information...6-3 Troubleshooting ...7-1 Recommended Equipment for Troubleshooting ...7-2 Troubleshooting the Aaron 950 ...7-2 Inspecting the Generator ...7-2 Inspecting the Receptacles ...7-2 Inspecting Internal Components ...7-3 Understanding Error Codes and Audio Tones ...7-4 Correcting Common Problems ...7-5 Main Board Test Points ...7-9 Display Board Test Points ...7-9

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Repair Policy and Procedures ...8-1 Responsibility of the Manufacturer ...8-2 Returning the Generator for Service ...8-2 Step 1 – Obtain a Returned Goods Authorization Number ...8-2 Step 2 – Clean the Generator ...8-2 Step 3 – Ship the Generator ...8-3 Warranty ...A-1 Board Drawings, Schematics, and Assemblies ...B-1 How to Order Parts from Aaron Medical ...B-2 Aaron 950 Design Breakdown and Drawing Reference ...B-2 Aaron Drawing and Schematic Package ...B-2

LIST OF FIGURES Figure 2 – 1 Layout of controls, indicators, and receptacles on the front panel...2-2 Figure 2 – 2 Controls for the cut, blend, and coag modes ...2-5 Figure 2 – 3 Controls for the fulguration and bipolar modes and presets ...2-6 Figure 2 – 4 Indicators and receptacles...2-7 Figure 2 – 5 Layout of controls and indicators on the rear and side panels ...2-9 Figure 2 – 5 Layout of controls on the rear and side panels...2-9 Figure 3 – 1 Output power versus impedance for cut mode ...3-6 Figure 3 – 2 Peak voltage versus setting for cut mode ...3-6 Figure 3 – 3 Output power versus impedance for blend mode ...3-7 Figure 3 – 4 Peak voltage versus power setting for blend setting...3-7 Figure 3 – 5 Output power versus impedance for fulguration mode ...3-8 Figure 3 – 6 Peak voltage versus power setting for fulguration mode ...3-8 Figure 3 – 7 Output power versus impedance for coagulation mode...3-9 Figure 3 – 8 Peak voltage versus power setting for coagulation mode...3-9 Figure 3 – 9 Output power versus impedance for bipolar mode ...3-10 Figure 3 – 10 Peak voltage versus power setting for bipolar mode ...3-10 Figure 3 – 11 Cut mode waveform...3-11 Figure 3 – 12 Blend mode waveform ...3-11 Figure 3 – 13 Coag mode waveform...3-11 Figure 3 – 14 Fulguration mode waveform ...3-11 Figure 3 – 15 Bipolar mode waveform ...3-11 Figure 4 – 1 Functional block diagram of the Aaron 950 system ...4-2 Figure 5 – 1 Installation and placement...5-4 Figure 6 – 1 Fuse location ...6-3

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BOARD DRAWINGS AND SCHEMATICS Schematic 1 Main Board ...B-3 Schematic 2 RF Amplifier Circuit ...B-4 Schematic 3 Power Supply...B-5 Schematic 4 Display Board ...B-6 Schematic 5 Logic Control Center...B-7 Schematic 6 Request Activation Sense Circuit (Foot)...B-8 Schematic 7 Request Down Sense Circuit...B-9 Schematic 8 Request Up Sense Circuit ...B-10 Schematic 9 Request Activation Sense Circuit (Hand)...B-11 Schematic 10 Patient Plate Sense Circuit...B-12 Schematic 11 Main Printed Circuit Board...B-13 Schematic 12 Top Display Circuit Board ...B-14 Schematic 13 Bottom Display Circuit Board...B-14 Schematic 14 Final Assembly Wiring Drawing ...B-15 Schematic 15 Final Assembly Drawing ...B-16

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THE AARON 950 ELECTROSURGICAL GENERATOR This section includes the following information:  Functional Description  Unit Description  Safety Precautions When Repairing the Generator

CAUTIONS: Read all warnings, cautions, and instructions provided with this generator before using. Read the instructions, warnings, and cautions provided with electrosurgical accessories before using. Specific instructions are not included in this manual.

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FUNCTIONAL DESCRIPTION The Aaron 950 is a multipurpose Electrosurgical Generator for use in physician’s offices and surgi-centers. It provides unsurpassed performance, flexibility, reliability, and user convenience in one compact package. The Aaron 950 Electrosurgical Generator includes digital technology. This new technology is evident in the selfchecking circuitry and error code readouts. The unit offers monopolar and bipolar electrosurgical operations. The following are Aaron 950 key advantages and benefits. Power Capabilities

Up to 60 watts of Pure Cut @ 500 Ω Up to 60 watts of Blend @ 800 Ω Up to 60 watts of Coagulation @ 1000 Ω Up to 35 watts of Fulguration @ 1000 Ω Up to 30 watts of Bipolar @ 200 Ω

Memory

Six user-defined presets recall frequently used power and mode settings.

Two Levels of Coagulation

Pinpoint Coagulation - provides precise control of bleeding in localized areas. Fulguration - provides greater control of bleeding in highly vascular tissue over broad surface areas.

Self Diagnostics

These diagnostics continually monitor the unit to ensure proper performance. Whenever a problem is detected, medical personnel receive audible alarm responses, and the output is suspended until the alarm condition is cleared.

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Isolated RF output for Cut, Blend, and Coagulation Modes

This minimizes the potential of alternate site burns.

Ground Referenced RF Output for Fulguration Mode

This output allows flexibility to use the generator without a return electrode in fulguration mode.

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UNIT DESCRIPTION The Aaron 950 Electrosurgical Generator is a self-contained unit, consisting of the main enclosure and power cord. The main components incorporated in the generator include: • FRONT PANEL COMPONENTS Dial for controlling power output; switches and indicators for Cut, Blend, Coagulation, Fulguration, and Bipolar selection; receptacles for connecting electrosurgical accessories – Monopolar handpiece receptacle, Patient Plate receptacle, Bipolar cord receptacle, Footswitch receptacle, user Presets control and display, and digital indicators that show the current settings. • REAR PANEL COMPONENTS Volume control • OTHER COMPONENTS Power switch (located on side of unit), power cable receptacle (located on bottom of unit), A901 Remote Receptacle (located on the bottom of the unit) • INTERNAL COMPONENTS Main PCB, Barrier PCB, Line transformer

SAFETY PRECAUTIONS WHEN REPAIRING THE GENERATOR Before servicing the Aaron 950 Electrosurgical Generator it is important that you read, understand, and follow the instructions supplied with it. Also, be familiar with any other equipment used to install, test, adjust, or repair this generator.

General Warnings, Cautions, and Notices WARNINGS: Use the generator only if the self-test has been completed as described. Otherwise, inaccurate power outputs may result. The instrument receptacles on this generator are designed to accept only one instrument at a time. Do not attempt to connect more than one instrument at a time into a given receptacle. Doing so will cause simultaneous activation of the instrument.

CAUTIONS: Do not stack equipment on top of the generator or place the generator on top of electrical equipment. These configurations are unstable and/or do not allow adequate cooling. The unit is designed to be wall mounted or mounted on a mobile stand. Provide as much distance as possible between the electrosurgical generator and other electronic equipment (such as monitors). An activated electrosurgical generator may cause electrical interference with them. Do not turn the activation tone down to an inaudible level. The activation tone alerts the surgical team when an accessory is active.

NOTICES: If required by local codes, connect the generator to the hospital equalization (grounding) connector with an equipotential cable. Connect the power cord to a wall receptacle having the correct voltage. Otherwise, product damage may result.

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Active Accessories WARNINGS: Shock Hazard – Do not connect wet accessories to the generator. Shock Hazard – Ensure that all accessories and adapters are correctly connected and that no metal is exposed.

CAUTIONS: Accessories must be connected to the proper receptacle type. In particular, bipolar accessories must be connected to the Bipolar instrument receptacle only. Improper connection may result in inadvertent generator activation. Set power levels to the lowest setting before testing an accessory.

NOTICE: During bipolar electrosurgery, do not activate the generator until the forceps have made contact with the patient. Product damage may occur.

Fire / Explosion Hazards WARNINGS: Explosion Hazard – Do not install the generator in the presence of flammable anesthetics, gases, liquids, or objects. Fire Hazard – Do not place active accessories near or in contact with flammable materials (such as gauze or surgical drapes). Electrosurgical accessories that are activated or hot from use can cause a fire. Use a holster to hold electrosurgical accessories safely away from personnel and flammable materials. Fire Hazard – Do not use extension cords. Fire Hazard – For continued protection against fire hazard, replace fuses only with fuses of the same type and rating as the original fuse.

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Generator Electric Shock Hazards WARNINGS: Connect the generator power cord to a properly grounded receptacle. Do not use power plug adapters. Do not connect a wet power cord to the generator or to the wall receptacle. To allow stored energy to dissipate after power is disconnected (caps discharge), wait at least five minutes before replacing parts. Always turn off and unplug the generator before cleaning. Do not touch any exposed wiring or conductive surfaces while the generator is disassembled and energized. Never wear a grounding strap when working on an energized generator. When taking troubleshooting measurements use appropriate precautions such as using isolated tools and equipment, using the “one hand rule,” etc. Potentially lethal AC and DC voltages are present in the AC line circuitry, high voltage DC circuitry, and associated mounting and heat sink hardware described in this manual. These potentials are not isolated from the AC line. Take appropriate precautions when testing and troubleshooting this area of the generator. High frequency, high voltage signals that can cause severe burns are present in the RF output stage and in the associated mounting and heat sink hardware. Take appropriate precautions when testing and troubleshooting this area of the generator.

Servicing CAUTIONS: Read all warnings, cautions, and instructions provided with this generator before servicing. The generator contains electrostatic-sensitive components. When repairing the generator, work at a static-controlled workstation. Wear a grounding strap when handling electrostatic-sensitive components, except when working on an energized generator. Handle circuit boards by their nonconductive edges. Use an anti-static container for transport of electrostatic-sensitive components and circuit boards.

Cleaning NOTICE: Do not clean the generator with abrasive cleaning or disinfectant compounds, solvents, or other materials that could scratch the panels or damage the generator.

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CONTROLS, INDICATORS, AND RECEPTACLES This section describes the front, rear, and side panels, including all controls, indicators, receptacles, and ports.

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FRONT PANELS

Figure 2 – 1 Layout of controls, indicators, and receptacles on the front panel

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CONTROLS AND INDICATORS OVERVIEW Users may control most Aaron 950 functions from the front panel. Each control is plainly marked and colored on the front panel for quick reference. The volume control is located on the rear panel. Normal operations involve activating the generator with either a front connected handswitch or footswitch. The following components are the User Interface for the Aaron 950 Electrosurgical Generator: Power Switch

The rocker ON/OFF switch on the lower right side corner allows the Aaron 950 to be shut off when the unit is not in use.

Power Output Control Knob

The rotary knob allows you to select the desired RF power level for all modes of operation. The Power Control Knob moves at a graduated 1 watt per notch (incrementally) for Cut, Blend, and Coagulation (1 to 60); Fulguration (10 to 35); and Bipolar (10 to 30). The Power Control Knob moves at a graduated .1 watt per notch (incrementally) in Fulguration and Bipolar modes below 10 watts (.1 to 10).

Power Display

The large power output display reports the generator’s output power setting. During operation, the numeral output of the display gives the surgeon an indication of available generator power.

Membrane Function Switches

The front panel overlay contains 7 membrane function switches (sometimes called matrix switches). There is a membrane switch dedicated for each operational mode. These switches toggle the unit between mode settings.

Visual LED Indictors

Mode LEDs indicate the mode setting. The YELLOW indicators and controls indicate cutting and blending operations. The yellow LED indicates that either a Cut or Blend mode is activated. The BLUE indicators and controls indicate Coagulation, Fulguration, and Bipolar operation. The blue LED indicates either Coagulation, Fulguration, or Bipolar mode is activated. The Patient Plate Alarm is indicated by the red LED located at the bottom of the front panel. Operating only in the Cut, Blend, and Coagulation modes, this indicates that no return electrode is sensed by the unit.

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Audible Indicators

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An activation tone sounds whenever the Aaron 950 Electrosurgical Generator is activated. The volume may be adjusted up or down on the rear of the unit using a small screwdriver. An alarm siren sounds during all alarm conditions. The volume of this alarm cannot be adjusted.

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CUT, BLEND, AND COAG CONTROLS Figure 2 – 2 Controls for the cut, blend, and coag modes

Cut, Blend Active Indicator (yellow) Indicates that the power has been activated in the selected mode.

Cut Mode Selector When pressed, selects the pure cut mode.

Cut Indicator Indicates when pure cut mode is selected.

Blend Mode Selector When pressed, selects the blended cut mode.

Power Display (watts) Indicates the power set for the selected mode.

Coag, Fulguration, Bipolar Active Indicator (blue) Indicates that the power has been activated in the selected mode.

Blend Indicator Indicates when blended cut mode is selected. RF Isolated Indicator Indicates when the RF output is isolated from the ground.

Coag Mode Selector When pressed, selects the coagulation mode.

Coag Indicator Indicates when coagulation mode is selected.

Service Guide • Aaron 950

Power Output Control Knob Turn clockwise to increase power output, counterclockwise to decrease power output.

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FULGURATION, BIPOLAR, AND PRESET CONTROLS Figure 2 – 3 Controls for the fulguration and bipolar modes and presets

Fulguration Mode Selector When pressed, selects the fulguration mode.

Fulguration Indicator Indicates when fulguration mode is selected.

Cut, Blend Active Indicator (yellow) Indicates that the power has been activated in the selected mode.

Power Display (watts) Indicates the power set for the selected mode.

Bipolar Mode Selector When pressed, selects the bipolar mode.

Coag, Fulguration, Bipolar Active Indicator (blue) Indicates that the power has been activated in the selected mode.

Bipolar Indicator Indicates when bipolar mode is selected. RF Ground Referenced Indicator Indicates when the RF output is ground referenced. Only applies to the fulguration mode.

Presets Display Indicates which preset is selected (A-F). B and D are displayed in lowercase letters (b and d). No Presets Indicator Red dot blinks to indicate when no user defined preset is being used.

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Presets Recall Selector When pressed, selects the next preset setting.

Presets Set Button When depressed for 2 seconds, makes the current settings the preset letter shown in the indicator window.

Power Output Control Knob Turn clockwise to increase power output, counterclockwise to decrease power output.

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INDICATORS AND RECEPTACLES Figure 2 – 4 Indicators and receptacles

Monopolar Handpiece Receptacle Accepts the Aaron A901 3-button handpiece cord.

Patient Plate Receptacle Accepts the Aaron A1202C reusable grounding cord.

Bipolar Cord Receptacle Accepts the Aaron A827EU bipolar forceps cord.

Footswitch Receptacle Accepts the Aaron A1203W footswitch cord.

Patient Plate Alarm Indicates (red LED) an alarm condition regarding the return electrode cord or pad.

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