REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Wednesday, 20 March 2019

ATLAS PATIENT MONITOR - TROUBLESHOOTING [MEDICAL EQUIPMENT]

ATLAS PATIENT MONITOR - TROUBLESHOOTING [MEDICAL EQUIPMENT]

TROUBLESHOOTING
Static Manometer Accuracy Test
Static Manometer Accuracy Test
Required materials.
  1. Serial interface cable
  2. PC with HyperTerminal (Windows 95 or above)
  3. 500cc vessel with inflation system.
  4. Calibrated manometer
  • Turn computer on and activate Hyper terminal. 
Hyper Terminal Settings are:
  • 9600 Baud, 8 bit word, 1 stop bit no parity, no flow control ANSI character set Start àPrograms àAccessories àCommunication àHyperTerminal
  • Turn Atlas on. 
  • Enter the following command sat the PANGEA> prompt.
PANGEA> bp safety off<ENTER>
PANGEA> bp valve close<ENTER>
Pressurize the Atlas monitor to the applied pressures in Table.
  • To compare the applied pressure to the transducer readings use the following command.
  • PANGEA> bp press<ENTER>
  • Verify that the primary transducer and secondary transducer are within the specifications listed in Table.
NOTE: The Atlas monitor will return a response to the computer screen as follows.
If you tested at the 50mmHg pressure you would receive a message similar to: px = 5279,sx = 5305 x 0.01. Where px is the primary transducer and 5279 = 52.79 mmHg and sx is the secondary transducer and 5305 = 53.05 mmHg.
BP Leak Test
NOTE: Unit must not leak more than 5 mmHg in a 15 second interval while attached to a 100cc test cavity pressurized at50 mmHg, 150 mm Hg and 250 mmHg.
  • Required Materials: 100cc test vessel (+10cc/-0cc), stopwatch, and squeeze bulb, calibrated manometer.
  • Connect Atlas to 100cc test vessel and calibrated manometer.
  • Turn Atlas on.
  • Press DATE/TIME button then press LEAD SELECT button to access the Service Mode.
  • Press SELECT button and choose Verify manometer.
  • Pressurize the Atlas with squeeze bulb to 50mmHg and allow reading to stabilize.
  • Observe pressure for 15 seconds.
  • Unit should not leak more than 5mmHg during this time.
  • Repeat this process at 150mmHg and 200mmHg.
BP Dump Verification Test
  • Connect the Atlas to a 500 cc vessel.
  • Turn Atlas on.
  • Press DATE/TIME button then press LEAD SELECT button to access the Service Mode.
  • Select Verify manometer.
  • Pressurize the Atlas to just over 260 mmHg.
  • Allow reading to stabilize for 15 seconds.
  • Ensure the reading is still over 260 mmHg.
  • Start the stop watch when you press the SELECT button. When the SELECT button is pressed the Atlas will start a pressure dump.
  • Verify that the pressure drops to below 15 mmHg within 10 seconds.
Hardware Fail Safe Tests
  • NOTE: Atlas hardware must detect over pressure on unit pneumatic system between 296.0 mmHg and 330.0 mmHg.
  • Connect the Atlas for testing.
  • Turn Atlas on.
  • Press CLOCK/DATE button then press LEAD SELECT button to access Service Mode.
  • Press SET button to highlight the Manometer.
  • Pump system up and record at what pressure the Atlas dumps.
ECG/Respiration Test
NOTE: Simulator should support ECG impedance respiration.
  • Cycle power on Atlas, connect a 5 lead ECG cable set to the simulator. Configure the simulator for NSR, 100 bpm and set the impedance respiration rate to 20.
  • Press DATE/TIME button then press TREND button to access Advanced Configuration menu.
  • Press SELECT button to highlight ECG lead set and press SET button to select 5 wire.
  • Set ECG gain to Automatic, ECG speed to 25mm/s, ECG bandwidth to Monitor, Second trace selection to ECG.
  • Press TREND button to return to idle screen.
  • Verify you see:
1. ECG cascading onto second line
2. Scale bar on top left of CRT
3. Heart rate displayed as set on simulator
4.Lead Selected = II
5. Pulse tone high pitched
  • Press LEAD Select button and step through each of the lead settings. (I,II,III,aVR,aVL,aVF,V)
  • Verify that you see a different ECG waveform for each lead selected.  Heart Rate will go to dashes and alarms on some leads.
  • Set lead selected to II.
  •  Press DATE/Time button then press Trend button to access Advanced Configuration menu.
  •  Change Second trace selection to Respiration. Press Trend button to return to idle screen.
  • Verify that you see:
1. ECG on top line
2. Scale bar on left of top line
3. Heart rate displayed as set on simulator
4. Lead Selected = II 5. Pulse tone high pitched
6. Respiration trace on second line and rate as set on simulator
7. Respiration rate displayed on CRT as set on simulator.
  • Disconnect ECG simulator.
SpO2 Test
  • Turn SpO2 alarms on.
  • Connect SpO2 cable to simulator.
  • Set simulator pulse rate to 60 beats/minute and verify that pulse rate is 60 ±3 beats/minute or3%, whichever is greater.
  • Set SpO2 between 70% and 100% and verify that SpO2 is accurate ±2 digits.
Posted By: FRANK at 03:06
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