Epson EPL-N2050 Service Manual page 61

EPSON EPL-N2050
3.1.2.3 General Notes on the FIPs
1. FIPs assume there is no malfunction in printer controller. If you are
unable to fix a problem using the FIPS, we recommend that you replace
the printer controller.
2. FIPs use new and "known good" components as troubleshooting tools.
We recommend you carry a spare CRU, PWBA HKB MCU, and PWB ESS.
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/Connection 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 CRU and Cassette Assy are installed,
and the Cover Assy Front and Cover Assy Rear are closed (Interlock
Switch is actuated).
9. All voltage values given in the FIPs are approximate values. Actual
measured voltages may vary somewhat from the given values.
Troubleshooting
10. FIPs may instruct you to remove or replace a component. Refer to Section
9 Removal and Replacement, for information on how to remove and
reinstall a component.
11. When a FIP instructs you to replace a component, and that component is
part of a larger assembly, you should replace the entire assembly.
Start
Is the printer
message
indicated?
Abnormal
operations which
are not indicated
by error codes?
Any problems
on image
quality?
Electrical Noise
(Secondary FIPs)
Troubleshooting
Yes
Go to Troubleshooting by
Printer Message.
No
Go to Troubleshooting by
Yes
Printer Performance (not
indicated by error codes).
No
Yes
Go to Troubleshooting by
Image Quality.
No
Figure 3-1. FIP Flowchart
Revision B
61