Epson EPL-N4000 - Page 116

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