7 Troubleshooting
M1207026
7-7
7.3 Troubleshooting guide
Symptom
Probable cause
Action
• Shut down mode
1. Cable from CSB to DMB.
2. CSB
3. DMB
1. Check cable connection.
2. Replace CSB.
3. Replace DMB.
The system will check the connection between CSB and DMB when it is power on.
Symptom
Probable cause
Action
• AC LED not lit
(Power cord plugged into
live receptacle; AC Inlet
circuit breaker On)
(The problem is most likely
in the +15V supply or in the
LED circuit.)
1. Universal power supply
2. Front panel keyboard (LED is part of it)
3. DMB
1. Check power supply output (Section 2.7.2).
2. Check ribbon cable connection; replace front
panel keyboard.
3. Replace DMB.
The LED is powered by the +15V supply from the universal power supply. Turn system switch to On. If ventilator operates from the
main supply, check 1. If ventilator operates from backup battery, check 2 and 3.
Symptom
Probable cause
Action
• Nothing happens when
System switch is turned
On
(The problem is most likely
somewhere between the
system switch and the
control sample board.)
1. Cable from J8 of CSB to system switch.
2. Cable from CSB to DMB.
1. Check/jumper cable connection; replace cable.
2. Check cable connection; replace cable.
Turning the system switch to On should connect the power to the system. It is a physical connection for the power supply.
Symptom
Probable cause
Action
• No display
(System switch On; LED lit)
(The problem is most likely
in the Display Module.)
1. Ribbon cable, DMB to LCD display
2. LCD display
3. DMB
1. Check cable connection.
2. Replace LCD display.
3. Replace DMB.
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 15V
to power the LED.
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. DMB
1. Ensure cable is plugged in.
2. Replace speaker.
3. Replace DMB.
Power for the speaker comes from the Power Section of the DMB. Drive for the speaker comes from the Digital Section of the DMB
board.
M1207027
004
MANUAL−DOC, Technical Reference Manual, Technical Reference Manual for 9100c, English−default
Reproduced from the electronic master in MATRIX