Novametrix Medical Systems MARS PO2 TECH 2001 Service Manual page 36

Section 7
Electronic Tests
1. Attach line cord and set rear panel Mains switch to "|". Verify that the green
panel illuminates.
The monitor may power up when the Mains switch is set to"|", if this occurs turn the monitor off
with the front panel button.
2. Measure the voltage at J102 pin 2 and verify 13.2 VDC ± 0.4 volts.
3. Simultaneously press the left most softkey and the power button.
While "Calculating Checksum" is displayed, press and hold the third softkey from the right until
"Novametrix Inc Production Test" appears.
4. Measure the voltage at TP1. Verify 5.000V ± 50mV. Adjust VR1 if necessary.
To adjust VR1, power down the monitor. Remove the 2776-01 board. Power up the monitor.
Adjust the voltage at TP1. Power down the monitor, re-install the 2776-01 board. Re-start the
test at step 3.3.
5. Verify the following voltages on the 2775-01 board:
6. Verify the following voltages on the 2776-01 board:
7. Verify D1 on the 2776-01 board is flashing at approximately 1/2 HZ with a 50% duty cycle. Verify
there is no DSP error message displayed.
30
Model 2001 Service Manual
Location
IC40 pin 4
IC40 pin 8
IC20 pin 28
IC37 pin 14
IC37 pin 7
IC37 pin 10
IC36 pin 1
IC30 pin 14
Location
TP2
TP5
Signal Name
-VA
+VA
VBACK
+V5
-V5
VREF
4VREF
-4VREF
Signal Name
+3.3
+2.5V
Voltage
-12.00V ± 500mV
12.00V ± 500mV
4.75V ± 250mV
5.00V ± 250mV
-5.00V ± 250mV
2.500V ± 5mV
4.045V ± 50mV
4.045V ± 100mV
Voltage
3.3V ± 66mV
2.5V ± 50mV
Procedure
LED on the front
Rev. 01