Epson EPL-N4000 - How to Follow a FIP; General Notes on Using Fips

EPSON EPL-N4000/EPL-N4000+ Chapter 3 Troubleshooting
Rev.B 92
3.1.2.2 How to follow a FIP
1. Each numbered step in a FIP instructs you to perform a certain
action or procedure.
2. The action box may contain additional information and numbered
substeps you must follow to perform the action.
3. The action is followed by a question.
4. If your response to the question is
Yes
, then follow the instructions
for a Yes reply.
5. If your response to the question is
No
, then follow the instructions
for a No reply.
6. FIPs often ask you to take volta
g
e readin
g
s at certain test points
within the printer. Refer to “Appendix” for si
g
nal information, if
necessary.
7. FIPs often ask you to replace a printer component. Chapter 4
Disassembly and Assembly provides you detailed steps for
removin
g
and replacin
g
all major parts of the printer.
3.1.2.3 General Notes on Using FIPs
1. FIPs assume there is no malfunction in the printer controller (ESS).
If you are unable to fix a problem usin
g
the FIPS, we recommend
that you replace the printer controller.
2. FIPs frequently use new or "known
g
ood" components as
troubleshootin
g
tools. We recommend you carry a spare Print
Cartrid
g
e (EP Cartrid
g
e), Fuser Assembly, MCU PWB, ESS PWB,
and LVPS PWB.
3. Unless indicated otherwise, the instruction "switch ON main power"
means for you to switch ON printer power and let the printer
proceed throu
g
h power-on dia
g
nostics and warm-up until it is on-
line and ready to print.
4. Conventions used to represent connectors:
*P/J XX means a Plu
g
and its correspondin
g
Jack are connected.
*PXX means a Plu
g
is disconnected. (Unless this plu
g
is soldered to
a PWB).
*JXX means a Jack is disconnected. (Unless this jack is soldered to
a PWB).
5. When you are instructed to take a volta
g
e readin
g
between "P/J A–
B and P/J X–Y", place the red probe (+) of your meter on pin B of P/
J A, and place the black probe (–) of your meter on pin Y of P/J X.
6. When you are instructed to take volta
g
e readin
g
s between "P/J X
and P/J Y" (without specified pin numbers), check all volta
g
e
carryin
g
pins. Refer to the Wirin
g
Dia
g
rams for si
g
nals and pin
numbers.
7. When you are instructed to take a volta
g
e readin
g
, the black probe
(–) is
g
enerally connected to a pin that is either RTN (Return) or SG
(Si
g
nal Ground). You can substitute any RTN pin or test point in the
printer, and you can use FG (Frame Ground) in place of any SG pin
or test point.
8. Unless a FIP instructs you otherwise; before measurin
g
volta
g
es
make sure the printer is switched ON, the Print Cartrid
g
e and the
Paper Cassette are installed, and the Main Interlock Switch is
actuated.