Epson EPL-N4000, Руководство по обслуживанию

Страница: 106 / 306

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 voltage readings at certain test points
within the printer. Refer to “Appendix” for signal information, if
necessary.
7. FIPs often ask you to replace a printer component. Chapter 4
Disassembly and Assembly provides you detailed steps for
removing and replacing 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 using the FIPS, we recommend
that you replace the printer controller.
2. FIPs frequently use new or "known good" components as
troubleshooting tools. We recommend you carry a spare Print
Cartridge (EP Cartridge), 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 through power-on diagnostics and warm-up until it is on-
line and ready to print.
4. Conventions used to represent connectors:
*P/J XX means a Plug and its corresponding Jack are connected.
*PXX means a Plug is disconnected. (Unless this plug 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 voltage reading 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 voltage readings between "P/J X
and P/J Y" (without specified pin numbers), check all voltage
carrying pins. Refer to the Wiring Diagrams for signals and pin
numbers.
7. When you are instructed to take a voltage reading, the black probe
(–) is generally connected to a pin that is either RTN (Return) or SG
(Signal 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 measuring voltages
make sure the printer is switched ON, the Print Cartridge and the
Paper Cassette are installed, and the Main Interlock Switch is
actuated.