Dräger Babytherm 8000 Repair Instructions page 44

- Switch on unit
What How
+ 5 V digital Measure with
multimeter between
test points 2 and 1
(GNDD)
Battery Measure with
voltage multimeter between
test points 3 and 1
(GNDD) with mains
connection
Battery Measure with
voltage multimeter between
test points 3 and 1
(GNDD) without mains
connection, however
with device switched on
4.4.3.2 Testing heating actuation, safety relay and heating feedback
Preparation for testing:
- Interrupt mains connection to Babytherm.
- Remove electronics assembly and heating panel with sensors from
Babytherm.
- Remove cover from electronics assembly.
- Interrupt ribbon cable connection between power PCB and controller PCB;
this involves disconnecting power PCB.
- Connect up Uni test board, complete 79 00 610 with 40-pin ribbon cable to
power PCB.
- Connect up heating on power PCB.
- Establish mains connection:
6132.200 Babytherm 8000
Test value
+ 5.0 ± 0.2 VDC
≥ 3.5 VDC
≥ 3.5 VDC
Repair Instructions
Possible faults
- Mains fuses defective
- Fuse F2 defective
- Voltage regulator defective
- 9 VAC from transformer
defective
- Gold cap C25 defective
- Gold cap C25 not charged
(charging time approx. 15
min), because + 5V
defective
- Charging circuit for gold cap
C25 defective
- Gold cap C25 defective, if
previous test with voltage
supply OK
04.01 Page 44 of 115