Samsung ML-7000P Service Manual page 5

5-3 Malfunction
Error status
No Power
Internal Error 11
(Fuser Error)
Cover open
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Check
1. Check FUSE
- F1(8A), F2(5A) OPEN.
2. Check FUSE.
- F3(250V/3A) OPEN.
1. Check Fuser unit
- Thermostat open
- hallogen lamp defect
Normal : 110V version - 2~3•
220V version - 5~6•
2. Check themistor wire assembly defect.
Normal : 2~400k•
3. Check SMPS
- CN2 conection on SMPS
- Fuse(F2) open
- Defect of component related to Fuser
control.
4. Check Engine Board
- CN7 connection
- Fuser control line:
Cn5-2 level (Lamp on : 0.2V, Lamp off:24V)
Check the Cover Open operation
1. Cover open unit defect
2. Cable damage and connection
3. Engine board defect
Solution
1. Replace SMPS.
- Refer to "4-12"
2. Measure the resistance +5V and GND.
(Engine board CN5-pin6 and CN5-
pin9). If find the short circuit, replace
the Engine board.
To disassemble the Fuser unit,
refer to "4-5".
1. If the thermostat of the fuser unit
is opened. replace it.
2. If the thermistor wire of the fuser unit
is defected, replace it.
3. If the fuser unit is normal,
replace SMPS.
4. If not normal operation after replacing
it, replace the engine board.
1. Replace cover open Unit
-Refer to "4-6"
2. Replace cover open switch
assembly, and connect properly.
3. Replace the engine board.