Table of Contents
Advertisement
Example of error buffer: 12 9 6 0 0
After entering SDM:
1. 1 long blink of 750 ms followed by a pause of 1.5 s,
2. 2 short blinks followed by a pause of 3 s,
3. 9 short blinks followed by a pause of 3 s,
4. 6 short blinks followed by a pause of 3 s,
5. 1 long blink of 3 s to finish the sequence,
6. the sequence starts again.
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 over voltage
protection (errors 70 - 74). Possible causes:
–
A short-circuit present on PSU.
–
A short-circuit present in PSU load circuit.
–
The converter is 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 the PFC works, check the V_cego.
3. If V_cego is high, check V_s on the LLC (Vs_unsw).
4. If there is no V_s, check pin 15.
5. If the voltage is OK, check pins 12 and 14.
6. If there are no pulses, check controller pin 10.
7. If pin 10 < 1 V, the IC is probably defect.
•
If fuse 1004 (diagram P6) 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 6605 and 6606, and MOSFET 7610 (diagram
P5).
•
The set does not react on the 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.
Service Modes, Error Codes, and Fault Finding
FM23, FM24, FM33
5.
EN 29
Advertisement
Table of Contents
