GE Giraffe, Руководство по обслуживанию, Страница: 104 / 212

Chapter 4: Troubleshooting
Troubleshooting Tables
4-42 Service Manual
4.4.11 Electronics – Heat Control
4.4.11.1 Heat Engine Failure
4.4.12 Electronics – Power Failure
4.4.12.1 Unit Will Not Turn On (Power Fail Alarm)
Possible Causes Step Troubleshooting Procedure Comments
No signal from Heat
Control Processor
1.
Refer to section “4.4.5.13 Sys Fail 11 [AA AA AA AA]”
for information.
Possible Causes Step Troubleshooting Procedure Comments
No 12V DC power
supply
1.
Remove the rear cover. Using a DC Volt Meter,
check the voltage from chassis to the top of fuse,
F7, on the Power PCA. If 12V is present, skip to
Step 5. Otherwise, continue.
2.
Check the connection from the power supply to
the Power PCA (J20). Make sure the connector and
pins are properly seated.
3.
If OK, remove the connector, J20, on the Power
PCA. Using a DC Volt Meter, check for 12V at
pins 1,5 on the cable side.
4. If there is still no DC, skip to Step 8.
Blown fuse on
Power PCA
5.
Using a DC Volt Meter, check the voltage from
chassis to the bottom side of fuses F7 (12V) and
F8 (3.5V). If there is no voltage, continue with steps,
to find/correct the short before replacing the
fuse(s).
6.
Disconnect J22 on the Power PCA. Test for power-
to-ground short on the Control PCA by probing the
harness connector: Pin 1, 2 (BLK) Ground; Pin 3
(RED) 3.5V; Pin 4 (ORN) 12V. DC Power SpO
2
warmer harness
part #:
6600-1587-700
7.
Isolate location of short: Disconnect the ribbon
cable from the Control PCA to the Alarm/ Light
PCA; Disconnect the flat flex cable from the Control
PCA to the LCD Module. Replace the PCA or module
that contains the short.
No AC voltage to
Power PCA
8.
*Assuming that the unit is plugged into the wall
and the rear main switch is turned On*
Turn on
the front panel switch. Disconnect J28 from the
Power PCA and test at pins 2,5 (center pins). If
there is no AC voltage, continue with steps. If OK,
then proceed to
Step 10 .