Epson AcuLaser M4000N, Service Manual

Page: 111 / 477

EPSON EPL-N3000/AcuLaser M4000N Revision C
Troubleshooting Troubleshooting for Individual Units 111
Confidential
3.4.1 LVPS
Table 3-60. Troubleshooting for LVPS
Step Action and Question Yes No
Parts below can be the source of this error (
Chapter 4 Disassembly and Assembly
)
• LVPS
(p.287)
• HVPS/MCU
(p.301)
• HARNESS ASSY LVPS
1
LVPS control power
1. Remove the SHIELD PLATE LVPS. (p.285)
2. Disconnect P/J41 from the LVPS.
(Refer to “Connectors (p.406)” )
3. Turn on the main power.
4. Measure the voltages between the following pins of
P/J41 to see if the values are as follows:
P/J41-1
↔
P/J41-2 3.3V
P/J41-4
↔
P/J41-3 5V
♦
Are the voltages between the pins of P/J41 as specified?
Go to Step 2 Replace the LVPS
2
LVPS drive power
1. Disconnect P/J42 from the LVPS.
2. Turn on the main power.
3. Measure the voltages between the following pins of
P/J42 to see if the values are as follows:
P/J42-1
↔
P/J42-2 24V
♦
24V between P/J42-1
↔
P/J42-2?
Go to Step 3
Go to 3.4.7
INTERLOCK S/W
24V
(p.119)
or 3.4.9
INTERLOCK S/W
REAR
(p.121)
or 3.4.10 SWITCH
I/L ASSY
(INTERLOCK S/
W FRONT R)
(p.121)
3
HARNESS ASSY LVPS
1. Turn off the main power.
2. Disconnect the P/J11 from the HVPS/MCU.
3. Disconnect the P/J41 from the LVPS.
♦
Is there continuity in each wiring between P/J11
↔
P/J41?
Go to Step 4
Replace the
HARNESS ASSY
LVPS
4
AC Power Supply
1. Check the AC power connection.
♦
Is the AC power cable connected and grounded properly?
Replace the
HVPS/
MCU Notify the
customer or its
electrical engineer.