Epson EPL-N4000, Service Manual

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EPSON EPL-N4000/EPL-N4000+ Chapter 3 Troubleshooting
Rev.B 93
9. All voltage values given in the FIPs are approximate values. Actual
measured voltages may vary more than 25% from the values stated
in the FIPs. The main purpose of most voltage readings taken in the
FIPs is to determine whether or not a component is receiving the
correct HIGH voltage value from the power supply and if gating (a
voltage drop) occurs during component actuation. Gating signals
may be nothing more than a pulse, resulting in a momentary drop in
voltage that may be difficult or impossible to read on the average
multimeter.
10. FIPs may instruct you to remove or replace a component. Refer to
Section 10 Removal and Replacement Procedures 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.
Figure 3-1. FIP Flowchart
Start
Is
the printer
message
indicated?
Abnormal
operations which
are not indicated
by error codes.
Any
problems on
image quality?
Electrical Noise
(Secondary FIPs)
Go to Troubleshooting
by printer message
Go to Troubleshooing
by Printer Performance
(not indicated by error codes)
Go to Troubleshooting
by Image Quality
Yes
No
Yes
No
No
Yes