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EN 22
5.
5.7
Protections
You can read the error codes of the error buffer via the service
menu (SAM), the blinking LED procedure, or via ComPair. If a
fault situation is detected an error code will be generated and if
necessary, the set will be put in the protection mode. Blinking
of the red LED at a frequency of 5 Hz indicates the protection
mode.
In some error cases, the microprocessor does not put the set
in the protection mode. The error codes are indicated by an
orange front LED.
To get a quick diagnosis the chassis has three service modes
implemented:
•
The Customer Service Mode (CSM): easy way to read out
the status of the set.
•
The Service Default Mode (SDM): start-up of the set in a
predefined way.
•
The Service Alignment Mode (SAM): adjustment of the set
via a menu and with the help of test patterns.
5.8
Repair Tips
Below some failure symptoms are given, followed by a repair
tip.
•
Error code indicates an under- or overvoltage
protection (errors 70 - 74). Possible causes:
–
Short-circuit present on PSU.
–
Short-circuit present in PSU load circuit.
–
Converter not functioning (no start-up, or non short-
circuit failure).
•
Set starts up, but switches 'off' soon.
1. Check the PSU outputs. If no output at all, verify the
Power Factor Corrector (= PFC or pre-conditioner) e.g.
the relays. When PFC is not switching, the LLC is
actively held off.
2. If PFC works, check VCEGO.
3. If VCEGO is high, check LLC (VS_UNSW).
4. If no VS, check pin 15.
5. If voltage is OK, check pins 12 and 14.
6. If no pulses, check controller pin 10.
7. If pin 10 < 1 V, the IC is probably defect.
•
If fuse 1004 (diagram P5) is blown. Check items 7005
and 7006. If one of them is defect, replace both!
•
If fuse 1400 (diagram P2) is blown. Check diode bridge
6600, diodes 6606 and 6607 and MOSFET 7610.
•
Set does not react on Remote Control Transmitter. If
the monitor is set (by accident or deliberate) in ICONN-
mode (via SAM - Options), and there is no ICONN-Box
connected, the RC-signal line to the OTC is interrupted.
This can be solved by connecting pin 8 and 9 of the RS232
connector at the rear of the monitor.
FM24
Service Modes, Error Codes and Fault Finding
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