Epson EPL-N4000 Service Manual page 116

EPSON EPL-N4000/EPL-N4000+
Table 3-11. Inoperative Printer
Step Actions and Questions
2 AC POWER CHECK
Check the voltage at the AC wall outlet.
Is there approximately 110VAC (or
220VAC if the printer is the 220VAC
model) at the AC wall outlet?
ESS PWB CHECK
3
1. Switch off the Main Switch.
2. Remove the ESS PWB
3. Switch on the Main Switch.
Do the Control Panel LEDs light up
and does the printer go into warm-
up?
LVPS +5VDC CHECK
4
1. Remove the Rear Cover.
2. Measure the voltage between J400-
7 and FG, and between J400-8 and
FG on the MCU PWB.
Is there +5VDC between J400-7 and
FG, and is there +5VDC between
J400-8 and FG.
5 LVPS +24VDC CHECK
Measure the voltage between J400-5
and FG, and between J400-6 and FG
on the MCU PWB.
Is there +24VDC between J400-5 and
FG, and is there +24VDC between
J400-6 and FG?
Rev.B
Yes No
Go to step 3 Troublesho
ot the AC
power at
the wall
outlet
Replace the Go to step 4
ESS PWB
with a new
one (See
Chapter 4)
Go to step 5 Go to step 6
Go step 8 Go to step 6
Table 3-12. Inoperative Printer
Step Actions and Questions
6 AC POWER IN CHECK
Measure the voltage between J19-1
and J19-3 on the Noise Filter PWB.
Is there 110VAC between J19-1 and
J19-3?
AC POWER TO LVPS CHECK
7
Measure the voltage between J20-1
and J20-3 on the AC Drive PWB.
Is there 110VAC between J20-1 and
J20-3?
8 OPTION ISOLATION
Remove all options, such as the Duplex
Unit or the High Capacity Feeder, from
the base printer.
Do the Control Panel LEDs light up
and does the printer go into warm-
up?
Chapter 3 Troubleshooting
Yes No
Go to step 7 Replace the
Noise Filter
PWB (See
Chapter 4)
Replace the Replace the
LVPS Main Power
Assembly Switch.
(See (See Chapter
Chapter 4) 4)
Replace the Go to Suspect
options one Components
by one until
the printer
becomes
inoperative
again. Go to
the
Technical
Manual of
the problem
option and
troubleshoo
t for
possible
electrical
short.
102