Datex-Ohmeda 7100, Technical Reference Manual

Page: 83 / 158

5 Troubleshooting
1006-0836-000 02/03 5-3
Symptom Probable cause Action
• No display
(System switch On;
LED lit;
Fan running)
(The problem is most likely
in the Control Module.)
1. Ribbon cable, control board to LCD display
2. LCD display
3. Control board
1. Check cable connection.
2. Replace LCD display.
3. Replace control board.
The lit LED indicates that AC power is getting to the power supply. The power supply is most likely OK since it’s supplying the 6V
( V V V VM M M MA A A AIIIIN N N N ) to power the LED and fan (and the rest of the circuitry).
Symptom Probable cause Action
• Fan doesn’t run
(Everything else OK)
(The problem is most likely
the fan or control
board.)
1. Fan harness
2. Fan
3. Control board
1. Ensure fan harness is plugged in.
2. Replace fan.
3. Replace control board.
Power for the fan (derived from V V
V VB
B
B BU
U
U US
S
S S
) comes from the Power Section of the control board.
Symptom Probable cause Action
• No alarm audio
(Alarm messages OK)
(The problem is most likely
the speaker or control
board.)
1. Speaker cable
2. Speaker
3. Control board
1. Ensure cable is plugged in.
2. Replace speaker.
4. Replace control board.
Power for the speaker comes from the Power Section of the control board. Drive for the speaker comes from the Digital Section of
the control board.