Dräger Babytherm 8000 Repair Instructions page 53

Keyboard
Refer also to testing of keypad under 4.8.3.2.
4.5.3.2 Testing displays and LEDs in situ
Prerequisite: "Check" key OK (see 4.5.3.1).
Press "Check" key during operation:
⇒
All LEDs (and horn) are actuated for one second; "88.8" appears on the
7-segment displays.
Possible faults:
Display
LEDs "40°C", "±1°C", ">37°C/<35°C"
and "horn off" defective (off or flash);
7-segment displays not OK
6132.200 Babytherm 8000
F2 F1
PCB Controller
EPROM
4 Service-LEDs
4 Service-LEDs on Controller PCB
V1 V2 V3 V4
Repair Instructions
PCB Display
during switch-on test after swich-on test
EPROM defective no key pressed = V1 to V3 off
1 key pressed = 1 LED flashes
RAM defective
2 keys pressed = 2 LEDs flash
PCB Display INOP
3 keys pressed = 3 LEDs flash
Processor ok Processor ok
Possible faults
- Display PCB defective
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