Epson AcuLaser C4000 Service Manual page 171

EPSON AcuLaser C4000/C4100/C3000
Step
PWBA MCU & HVPS (PL15.1.2) power supply circuit continuity
1. Disconnect the P/J11 connector from the PWBA MCU & HVPS.
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2. Check the continuity between P11-18 <=> P/J13-1.
Is there continuity between P11-18 <=> P13-1?
Harness Assy DRV 1 (PL15.2.2) continuity
1. Remove the PHD Assy (PL11.1.3).
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2. Measure the voltage between P41-23 <=> P/J41-22/21 of the PWB Drive (PL15.1.15).
Is there 3.3V DC between P/J41-23 <=> P/J41-22/21?
PWB Drive (PL15.1.15) power supply circuit continuity
1. Remove the PHD Assy (PL11.1.3).
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2. Measure the voltage between P61-6 <=> P/J61-5 of the PWB Drive (PL15.1.15).
Is there 3.3V DC between P/J61-6 <=> P/J61-5?
Harness Assy LVNC (PL15.2.1) continuity
1. Remove the PHD Assy (PL11.1.3).
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2. Measure the voltage between P165-3 <=> P/J165-4 of the LVPS (PL15.1.10).
Is there 3.3V DC between P/J165-3 <=> P/J165-4?
Sensor Paper (PL7.1.4) (Dup Jam) signal check
1. Remove the PHD Assy (PL11.1.3).
2. Remove the Sensor Paper (Dup Jam), and then reconnect the connector.
3. Move a piece of paper into and away from the sensor element of the Sensor Paper (Dup
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Jam).
4. Measure the voltage between P/J133-1 <=> P/J133-2.
Is the voltage between J133-1 <=> J133-2 0V DC when the paper is inserted, and 3.3V
DC when the paper is removed?
Harness Assy Front 2 (PL7.1.2) continuity check
1. Disconnect the P/J133 connector from the Sensor Paper (PL7.1.4) (Dup Jam).
2. Disconnect the P/J139 relay connector between the Harness Assy Front 1 (PL15.2.7) and
the Harness Assy Front 2.
3. Check the continuity for the following lines.
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J133-1 <=> J139-3
J133-2 <=> J139-2
J133-3 <=> J139-1
Is the continuity between J133 <=> J139 normal?
Troubleshooting
Check
Level 2 FIP
Treatment
Yes
Replace the PWBA MCU &
Go to step 9.
HVPS. (Refer to Ch4-4.2.18.1)
Replace the Harness Assy
Go to step 10.
DRV1 (PL15.2.2).
Replace the PWB Drive.
Go to step 11.
(Refer to Ch4-4.2.18.5)
Replace the Harness Assy
Go to FIP-DC (Page 5-280).
LVNC (PL15.2.1).
Go to step 13. Go to step 15.
Replace the Harness Assy Front 1
Go to step 14.
(PL7.1.2).
Revision F
No
3-155