Welch Allyn
WelchAllyn Vital Signs Monitor 5200 Series
Spot Vital Signs Monitor Series 5200 Service Manual Rev 4 Sept 1998
Service Manual
164 Pages
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Manuals Service Manual
Service Manual
Welch Allyn Vital Signs Monitor
Medical Division 4341 State Street Road, P.O. Box 220 Skaneateles Falls, NY 13153-0220 PN 95P360E Copyright 1996
Welch Allyn Vital Signs Monitor Service Manual Revision 4.0
SECTION 1:
General Information
SERVICE MANUAL
Welch Allyn Vital Signs Monitor
Copyright 1996 Welch Allyn Co. 4341 State Street Road Skaneateles Falls, NY 13153-0220
Service Manual pn95P360E Rev. 4, 9/98
Welch Allyn Vital Signs Monitor Service Manual Revision 4.0 *Note: All drawings enclosed are for reference only. Consult the system or the factory for all current drawings.
Revision History Revision
Sections
Date
Author
Description
1.00 2.00
All All
4/18/96 7/9/96
JDB/RJS JDB
3.00
All
5/28/97
JDB
4.00
All
10/1/98
JDB
Introduction of manual. Revision made due to problems found in training and changes to the repair software. Revisions made for support of Nellcor SpO2 module. Added schematics, board layouts and bill of materials, miscellaneous corrections.
Welch Allyn Vital Signs Monitor Service Manual Revision 4.0
Table Of Contents SECTION 1:
General Information Sub-Section: To Service Personnel ... 1.1 Limited Warranty/Warranty Assistance ... 1.2 Basic System Description ... 1.3 Basic System Operation Index ... 1.4 Basic System Operation ... 1.4 Block Diagram of Unit Operation ... 1.5 Specifications ... 1.6 Serial numbering system defined ... 1.7 Firmware Identification ... 1.8
SECTION 2:
Service Set Up Service Manual Intent & Scope ... Test Equipment Bench Layout ... Required Tools/Equipment List ... Replacement Parts List ... Maintenance/Service Support ...
2.1 Fig 2.2.1 2.2.2 2.3 2.4
1 3-4 5 7-9 11
Problem Diagnosis Overview ... Diagnostic Process/Returned units ... When and how to calibrate ... Loading Unit Software ... Welch Allyn Monitor Self Diagnostic Fault Codes ... “Complaint/Cause/Corrective Action” ...
3.1 3.2 3.3 3.4 3.5 3.6
1 3-5 7-8 9 11-13 15-19
Major Component Removal/Replacement (IN ORDER OF REMOVAL ACCESS) Front Housing ... Main Fuse F1 on Main PCB ... Main Printed Circuit Board (PCB) ... DC TO DC Converter (SpO2 units) ... Pressure Transducer on Main PCB ... Display PCB ... Key Pad (front housing) ... Temperature PCB ... Specific Oxygen Board (Nonin) ... Specific Oxygen Board (Nellcor) ... Pump ... Pressure Switch MPL-503 ... Valve (Pneutronics) ... Printer/Printer PCB/keypad ... Battery ...
4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.14 4.15
1-2 3-4 5-6 7-8 9-10 11-12 13-14 15-16 17-19 21-22 23-24 25-26 27-28 29-30 31-32
SECTION 3:
SECTION 4:
Page: 1 3-4 5 7 8-14 16-17 19-23 25 27
Welch Allyn Vital Signs Monitor Service Manual Revision 4.0
SECTION 5:
Test Procedures Sub-Section: Calibration test ... 5.1 Current tests ... 5.2 Noise test... 5.3 Button Test ... 5.4 Print quality ... 5.5 Pneumatic test ... 5.6 Hardware Fail-safe Tests ... 5.7 5.8 SpO2 option testing ... Temperature option testing ... 5.9 Check List for CBPM Service Work ... 5.10
SECTION 6:
Drawings, Schematics, Board Layouts, Bill of Materials
SECTION 7:
Repair Test Specifications Specifications ...
7.1
Page: 1-2 3 5 7 9 11-12 13 15 17 19-20
1-5
CAUTION: PRIOR TO DOING REPAIR WORK, USE GROUNDING MAT AND ANTI-STATIC WRIST STRAP TO MINIMIZE RISK OF DAMAGE TO SENSITIVE ELECTRONIC COMPONENTS.
Welch Allyn Vital Signs Monitor Service Manual
Section 1: General Information
Revision 4.0
1.1 To Service Personnel: Read and understand the Welch Allyn Vital Signs Monitor Operator Manual and this Service Manual. The information contained in both of these publications is subject to change without notice and should not be construed as a commitment by Welch Allyn, Inc. Welch Allyn assumes no responsibility for any errors that may appear in this manual. If the product and/or its operation varies significantly from any description herein, please contact the WELCH ALLYN TECHNICAL SERVICE DEPARTMENT: 1-800-450-9275 (828) 684-4895 Fax (828)687-9323 Welch Allyn, Inc. 95 Old Shoals Road Arden, North Carolina 28704 This product has been designed to provide a high degree of safety and reliability. However, we can not guarantee against: deterioration of components due to aging, normal wear, tampering, and abuse. All service and repairs must be performed by authorized Welch Allyn personnel or agents, using approved Welch Allyn replacement parts and approved process materials. Failure to so will invalidate the product warranty. Please refer to the product warranty for specific coverage. Welch Allyn, Inc. 95 Old Shoals Road Arden, North Carolina 28704 USA 1 800 450-9275
CAUTION WHEN USING ADHESIVES: ALWAYS WEAR SAFETY GLASSES AND PROVIDE ADEQUATE VENTILATION WHEN USING ADHESIVES, THEIR ACCELERATORS AND RTV SEALANTS. READ, UNDERSTAND, AND COMPLY WITH SAFETY RECOMMENDATIONS IN THE MATERIAL SAFETY DATA SHEET MSDS) FOR THESE MATERIALS. SUPER-GLUES (CA ADHESIVES) CAN CAUSE CORNEAL DAMAGE IF ACCIDENTLY SQUIRTED IN THE EYES, AND CAN SPONTANEOUSLY COMBUST IF SPILLAGE IS WIPED UP WITH CLOTH OR PAPER TISSUES. READ THE WARNINGS AND CAUTIONS PRINTED ON THE BOTTLES OR TUBES OF THESE GLUES!
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Welch Allyn Vital Signs Monitor Service Manual
Section 1: General Information
Revision 4.0
1.2 Limited Warranty Welch Allyn warrants the Welch Allyn Vital Signs Monitor, when new, to be free of defects in material and workmanship and to perform in accordance with manufacturer’s specifications for a period of two years from the date of purchase from Welch Allyn or its authorized distributors or agents. Welch Allyn will either repair or replace any components found to be defective or at variance from manufacturer’s specifications within this time at no cost to the customer. It shall be the purchaser’s responsibility to return the instrument to Welch Allyn or an authorized distributor, agent or service representative. This warranty does not include breakage or failure due to tampering, misuse, neglect, accidents, modification or shipping. This warranty is also void if the instrument is not used in accordance with manufacturer’s recommendations or if repaired by other than Welch Allyn or an authorized agent. Purchase date determines warranty requirements. No other express warranty is given.
To receive service assistance or to ask questions regarding this warranty, please call or write: Welch Allyn Technical Services Dept. 95 Old Shoals Road Arden, North Carolina 28704 USA 1 (800) 450-9275 or (828) 684-4895 Fax: (828) 687-9323
Service Policy All repairs on products under warranty must be performed or approved by a Welch Allyn Service Center. Unauthorized repairs will void the warranty. Products out of warranty should be repaired by qualified electronics personnel or a Welch Allyn Service Center.
Technical Assistance If you have an equipment problem that you cannot resolve, call the Welch Allyn Service Center nearest you for assistance. Technical service support is available to you by telephone on normal business days, from 8:30AM until 4:30PM Eastern Standard Time at the phone numbers listed on the next page.
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Section 1: General Information
Welch Allyn Vital Signs Monitor Service Manual Revision 4.0
Before returning a product for repair you must obtain authorization from Welch Allyn. An RGA (Return Goods Authorization) number will be given to you by our service personnel. Be sure to note this number on the outside of your shipping box. Returns without an RGA number will not be accepted for delivery.
Welch Allyn Service Centers For Service or Repair USA Customers Welch Allyn, Inc. Technical Service Centers 95 Old Shoals Road Arden, NC 28704-9739 USA Phone: 828-684-4895 Fax: 828-687-9323
CANADA Customers Welch Allyn Canada Limited Technical Service Centers 160 Matheson Blvd., East Mississauga, Ontario L4Z1 V4 CANADA Ph: 905-890-0004 or 1 800-561-8797 Fax: 905-890-0008 INTERNATIONAL Customers
Welch Allyn GmbH Technical Service Center Zollerstrasse 2-4 Road D-7241 7 Jungingen GERMANY Phone: [49]-7477-9271-73 Fax: [49]-7477-9271-93
Welch Allyn Australia Pty. Ltd. Technical Service Center Ground Floor, 18-20 Orian Road Lane Cove NSW 2066 AUSTRALIA Phone: [61]-29-4183-155 Fax: [61]-29-4183-650
Welch Allyn Ltd. 21-09 Golden Mile to 6001 Beach Road Singapore 199589 REPUBLIC OF SINGAPORE Phone: [65]-29l-0882 Fax: [65]-291-5780 LATIN AMERICA Customers MDI International Technical Service Centers 7324 SW 48th Street Miami, FL 33155 USA Phone: 305-669-9591 Fax: 305-669-l 971 4
Welch Allyn N!!
Welch Allyn Vital Signs Monitor Service Manual
Section 1: General Information
Revision 4.0
1.3 Basic System Description Introduction The Welch Allyn Vital Signs Monitor is designed to non-invasively and automatically measure systolic and diastolic pressure, pulse rate, temperature and oxygen saturation (SpO2) for adult and pediatric patients. All pressure, pulse, temperature and SpO2 values are displayed on large, easy-toread displays, and may be printed via an integrated thermal printer, as desired. The rechargeable battery and wide variety of mounting accessories make the Clinical Monitor convenient for many locations. The operator may choose any combination of simultaneous measurement modalities. This flexibility, combined with features such as programmable alarms and automatic BP cycles, makes the Clinical Monitor ideal for a wide variety of patient monitoring needs.
Refer to the Operator Manual PART NUMBER 5200-85 (SPECIFY LANGUAGE) Section 1 for complete information on Indications For Use, Special Features, Supplies and Accessories
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Welch Allyn Vital Signs Monitor Service Manual
Section 1: General Information
Revision 4.0
1.4 Basic System Operation INDEX 1.5.1 Blood Pressure Operating Modes a. Max/Min Blood Pressure and Pulse Ranges b. Blood Pressure Manual Mode c. Blood Pressure Auto Mode 1.5.2 Temperature Operating Modes a. Max/Min Temperature Ranges b. Temperature Normal Mode c. Temperature Monitor Mode 1.5.3 SpO Operating Mode 2 a. Max/Min SpO2 Ranges b. SpO2 Monitor Mode 1.5.4 Pulse Rate Feature Max/Min Pulse Rate Ranges
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Welch Allyn Vital Signs Monitor Service Manual Revision 4.0
1.4.1 Blood Pressure Operating Modes When a blood pressure measurement cycle is initiated, the cuff will automatically be inflated to the operator selected pressure level. The cuff will immediately begin to deflate in a stepped fashion and will determine systolic pressure and diastolic pressure from the pulses sensed by the cuff at various pressure levels. This is the oscillometric method of non-invasive blood pressure monitoring. Blood pressure measurements may be initiated manually, or automatically at time intervals determined by the user. At the completion of a measurement cycle the systolic and diastolic pressures are displayed. If the Monitor is in Automatic Mode, the measured values are kept on display until the next BP measurement is initiated. When not in Automatic Mode, the measured values are displayed for two minutes, after which time the display screen is blanked. The most recent BP measurement may be recalled by pressing the REVIEW button. When in Automatic Mode, if the unit is unable to determine the systolic or diastolic value, the measurement will be automatically repeated once.
1.4.1.a. Max/Min Blood Pressure Ranges The maximum and minimum ranges of blood pressure are detailed below: Measurement
Maximum
Minimum
Systolic Pressure
250 mmHg
60 mmHg
Diastolic Pressure
160 mmHg
30 mmHg
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Welch Allyn Vital Signs Monitor Service Manual
Section 1: General Information
Revision 4.0
1.4.1.b. Blood Pressure Manual Mode In the Manual Mode, a single blood pressure determination is made only when the START button is pushed. The manual mode is the default mode of operation for blood pressure determinations. A measurement cycle may be canceled at any time by pressing the CANCEL button. This action immediately initiates a rapid cuff deflation. The blood pressure measurement data will appear on the display immediately following the measurement. The display will blank after two minutes. If the display is blanked, pressing the REVIEW button on the front panel will recall the measurement. Up to 99 prior measurements are available for review or printing. In Blood Pressure Manual Mode, the following alarm limits may be activated; SYSTOLIC HIGH LIMIT, SYSTOLIC LOW LIMIT, DIASTOLIC HIGH LIMIT, DIASTOLIC LOW LIMIT, PULSE RATE HIGH LIMIT and PULSE RATE LOW LIMIT. Blood pressure determinations which activate alarms are indicated by flashing displays and a repetitive audible tone. If an alarm limit is violated, subsequent blood pressure determinations may be made only after the alarm condition is reset by pressing any button on the Monitor’s display.
1.4.1.c. Blood Pressure Automatic Mode The Automatic Blood Pressure Mode is entered by pressing the AUTO button. Pressing the AUTO button displays a choice of 10 cycle interval times as follows: “st” (STAT mode) 3 min, 4 min, 5 min, 10 min, 15 min, 30 min, 45 min, 60 min and 90 min. These choices represent the time interval from the beginning of one cycle to the beginning of the next automatic cycle. STAT mode allows the monitor to take continuous blood pressure measurements for 15 minutes. In addition, the operator may choose to disable the Auto Mode by choosing “-” (two dashes). A measurement cycle may be canceled at any time by pressing the CANCEL button. This action immediately initiates a rapid cuff deflation. The blood pressure measurement data will appear on the display immediately following the measurement and will remain displayed until the next measurement cycle is initiated.
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Section 1: General Information
Welch Allyn Vital Signs Monitor Service Manual Revision 4.0
1.4.1.c. Blood Pressure Automatic Mode continued In Blood Pressure Auto Mode, the following alarm limits may be activated; SYSTOLIC HIGH LIMIT, SYSTOLIC LOW LIMIT, DIASTOLIC HIGH LIMIT, DIASTOLIC LOW LIMIT, PULSE RATE HIGH LIMIT and PULSE RATE LOW LIMIT. Blood pressure determinations which activate alarms are indicated by flashing displays and a repetitive audible tone. Any alarm limit violation must be reset to continue automatically timed blood pressure determinations. The alarm may be reset by pressing any button on the monitor’s display.
1.4.2. Temperature Operating Modes Thermistor Thermometry measurements are made with the DIATEK/Welch Allyn SureTemp4TM thermometer. Oral and rectal probes utilize single-use disposable probe covers which limit cross-contamination. Oral or rectal temperatures are taken using ‘Normal’ or ‘Monitor’ operating modes. Auxiliary temperatures may be taken using the oral probe in the monitor operating mode. In the normal mode the thermometer’s microprocessor “predicts” body temperature in about 4 seconds for oral temperatures and in about 15 seconds for rectal temperatures. The monitor mode displays the patient’s actual temperature after 3 minutes and will continue to display an updated temperature as long as the probe remains in place. Temperature readings may be displayed in Fahrenheit or Celsius scales.
1.4.2.a. Max/Min Temperature Ranges Readings
Normal Mode
Monitor Mode
Temperature
Max 108.0F Max 42.2C
Max 108.0F Max 42.2C
Min 84.0F Min 28.9C
Min 84.0F Min 28.9C
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Welch Allyn Vital Signs Monitor Service Manual
Section 1: General Information
Revision 4.0
1.4.2.b. Temperature Normal Mode In Normal Mode, the device will measure temperature at discrete intervals and then calculate the rate of change according to a known algorithm. This allows the thermometer to predict the end point that the thermistor would reach if it were left in the mouth until it reached mouth temperature. This predictive feature allows the thermometer to arrive at an accurate oral temperature reading in approximately 4 seconds. Normal mode is the default operating mode for temperature determinations. Operator selectable patient alarm limits are not available in Temperature Normal Mode. However, temperatures which are outside of the operating range of the device will be noted on the temperature display.
1.4.2.c. Temperature Monitor Mode Continuous Monitor Mode operation is normally used for longer term monitoring and when difficult situations prevent accurate temperatures from being taken in the normal mode. The probe must be in contact with tissue for at least three (3) minutes for accurate temperature measurement. Monitor mode temperatures may not be identical to predicted ‘Normal’ temperatures because of ambient temperature influence and other factors. The trend in temperature is the important standard to be observed when in the ‘Monitor’ mode.
Operator selectable patient alarm limits are not available in Temperature Normal Mode. However, temperatures which are outside of the operating range of the device will be noted on the temperature display.
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Section 1: General Information
Welch Allyn Vital Signs Monitor Service Manual Revision 4.0
1.4.3 SpO2 Operating Mode The Welch Allyn Vital Signs Monitor incorporates either the Nonin® pulse oximetry system or the Nellcor® pulse oximetry system which determines arterial oxyhemoglobin saturation (% SpO2) by measuring the absorption of red and infrared light passed through the tissues. Changes in absorption caused by pulsation of blood in the vascular bed are used to determine arterial saturation and pulse rate. Oxygen saturation percent is calculated with each pulse detected, and thus the monitor display is continually updated. The pulse signal bar graph is an indicator of the strength and quality of the detected pulses. When SpO2 is measured, the patient’s pulse rate is also measured and displayed. A pulse rate measurement from the SpO2 determination overrides a pulse rate measurement derived from a blood pressure measurement. In SpO2 monitoring mode operator selectable alarm limits for low SpO2 % may be activated. A condition which violates the SpO2 low limit alarm is indicated by a flashing display and repetitive audible tone. Should a patient alarm condition for ≤ or pulse rate occur, the Monitor will indicate an alarm condition (flashing & beeping) while continuing to monitor and display the patient’s current SpO2%. The alarm will automatically reset when the patient’s condition returns to within the preset alarm parameters. Should a patient alarm condition for SpO2 or pulse rate occur, the operator may invoke “Silence Mode” by pressing the SILENCE button. This will silence the audible tone (display will continue to flash), while the practitioner attends to the patient and the monitor. Silence mode resets automatically after 30 seconds, or when the patient’s condition returns to within the preset alarm parameters. Removal of the SpO2 sensor from the patient will initiate an alarm. To reset the sensor alarm, press any button on the monitor’s display. SpO2 is generally measured via pulses detected using a finger sensor. However, for certain situations SpO2 may be measured at alternate sites including the earlobe, forehead and toes. Special sensors must be employed in these situations.
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Welch Allyn Vital Signs Monitor Service Manual
Section 1: General Information
Revision 4.0
1.4.3.a. Max/Min SpO2 Ranges The SpO2 sensor is designed to detect oxygen saturation as follows.
SpO2
Maximum
Minimum
99%
40%
1.4.3.b. SpO 2 Monitor Mode The SpO2 monitor performs most accurately with the finger clip sensor, which may be used on all fingers except the thumb. The finger clip sensor is recommended for spot checks or short term (<30 minutes) continuous monitoring. The device determines arterial oxyhemoglobin saturation (SpO2 %) by measuring the absorption of red and infrared light passed through the tissue. Oxygen saturation and pulse rate are displayed on the LED digital display. On each detected pulse, the pulse signal bar graph flashes. The intensity of this signal is a simple visual indicator of waveform signal strength, and can identify situations where the pulsatile nature of the tissue may not be adequate for an accurate SpO2 reading. The update interval of the bar graph should correspond to the patient’s pulse rate. This is an indication of the quality of the SpO2 signal.
1.4.4 Pulse Rate Feature The Welch Allyn Vital Signs Monitor is capable of determining pulse rate as an adjunct to the blood pressure measurement and the SpO 2 measurement. The pulse rate, in beats per minute, will be determined primarily from the SpO2 measurement methodology. In the case where SpO2 is not available, or is disabled, the pulse rate display will be driven from data collected as part of the blood pressure measurement method. There are two operator selectable alarm limits for the pulse rate. They are PULSE RATE HIGH LIMIT and PULSE RATE LOW LIMIT. Pulse rates which activate alarm limits are indicated by a flashing display and a repetitive audible tone. Should a pulse rate alarm occur when the pulse rate measurement is derived from the blood pressure measurement, no subsequent blood pressure or pulse rate measurements may be made until the alarm is reset. The alarm may be reset by pressing any button on the monitor’s display.
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Section 1: General Information
Welch Allyn Vital Signs Monitor Service Manual Revision 4.0
Should a pulse rate alarm occur when the pulse rate measurement is derived from the SpO2 measurement, the monitor will indicate an alarm condition (flashing & beeping) while continuing to monitor and display the patient’s current SpO2% and pulse rate. The alarm will automatically reset when the patient’s condition returns to within the preset alarm parameters. Should a patient alarm condition for pulse rate occur during SpO2 monitoring, the operator may invoke “Silence Mode” by pressing the SILENCE button. This will silence the audible tone (display will continue to flash), while the practitioner attends to the patient and Monitor. Silence mode resets automatically after 30 seconds, or when the patient’s condition returns to within the preset alarm parameters.
1.4.4.a. Max/Min Pulse Rate Ranges The maximum and minimum pulse rate ranges are as follows:
Pulse Rate
14
Maximum 200 bpm
Minimum 40 bpm
Welch Allyn Vital Signs Monitor Service Manual
Section 1: General Information
Revision 4.0
Figure 1.5 Block Diagram of Unit Operation Yes Is Start ➤ Is Power Button Yes ➤ Is Cancel Yes ➤ Button Pressed? Button Pressed? Pressed? No No No
➤
Off
➤
D
➤
➤
➤ C
Post
F2 ➤
➤
➤ F1
Ready State Power
Feed
➤ Start
Print Select
➤
➤
Silence Alarm for 30 Seconds
Reset Display ➤
➤
➤
Is Select Pressed? Yes
No
Record Setting for Displayed Alarm
➤ Yes Any button than auto select? No Is 10 sec. Yes since last action? No
➤ ➤
➤
➤
➤
Display Next Setting?
No
Display Next Setting?
➤
➤
➤
➤
➤ ➤
➤
Is Auto Pressed? Yes
➤
➤
➤
➤
➤
➤
➤
Yes
➤
Record Setting
Is Adjust Pressed? No
➤
➤
➤
Is 10 sec. since last action? No No
Display Current Timer Setting
Reset Display
Yes Any button than review select? No
Yes Any button than adjust select? No Is 10 sec. Yes since last action? No
➤
➤
16
Record Setting
➤
➤ Display Last Reading
Display Next RDG?
Display Current Setting of 1st Alarm ➤
Is Reading Finished? No
➤ M1 M2
➤
Is Cancel Pressed? No
Is Review Pressed? Yes
➤
Is Alarm Activated? Yes
Reset Display?
Yes
Mode
➤
➤
➤ ➤
➤
No
➤
Yes
Auto
➤
➤
Yes
Silence
➤ P2
➤
➤
Review
Start Taking Reading
➤ P1
Display Next Alarm @ Current Setting
➤
Welch Allyn Vital Signs Monitor Service Manual
Section 1: General Information
Revision 4.0
M1
➤
Both BP and SpO2 module active
F2
Print Report
F1 Advance Paper One line
➤
BP module active, SpO 2 module inactive
P1
➤
➤
➤
P2
➤
M2
➤
Figure 1.5 Block Diagram of Unit Operation
Review advances to next box Power returns to “O” at any time Cancel resets changes
D ➤ Post
➤
➤
SpO2 module active, BP module inactive
Show Versions Print produces version report
C ➤
Calibration Start closes valve Cancel opens valve Auto runs pump while pressed
Post ➤ Show Versions Print produces version report
➤
➤
Battery Voltage Start closes valve Cancel opens valve Auto runs pump while pressed ➤
Calibration Start closes valve Cancel opens valve Auto runs pump while pressed ➤
Temp Module Setup Adjust changes setup ➤
Battery Voltage Start closes valve Cancel opens valve Auto runs pump while pressed ➤
Set Date Adjust changes flashing display Select makes next display flash ➤
Temp Module Setup Adjust changes setup ➤
Set Time Adjust changes flashing display Select makes next display flash
Set Date Adjust changes flashing display Select makes next display flash ➤
➤
➤
➤
➤
Review advances to next box Power returns to “O” at any time Cancel resets changes
A/D Channel Noise Select changes A/D channels RS232/Service Port Test
SpO2 perfusion signal - systolic display, display perfusion status
Life Test Start begins cycling Cancel halts cycling
➤
Set Time Adjust changes flashing display Select makes next display flash
➤
➤
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