Erratic Operation - Epson EPL-N4000 Service Manual

EPSON EPL-N4000/EPL-N4000+

3.3.2 Erratic Operation

The printer has a variety of intermittent problems,but generally does not
complete a print cycle. The problems are generally not identified by
displayed Error Codes.
Table 3-13. Erratic Operation
Step Actions and Questions
SUSPECT COMPONENTS
The following components are
associated with this specific problem.
One or more of these components may
have failed partially or completely. If you
cannot isolate the problem using this FIP,
replace each component listed below,
one at a time, until the problem
disappears.
• Printer options
1 Does the printer frequently fail to
enter printer warm-up or is the Control
Panel frequently inoperative?
2 LVPS +5VDC UNDER LOAD
CHECK
1. Remove the Rear Cover.
2. Generate 50 Grid Test Patterns.
3. While the printing is generating the
Test Patterns, measure the voltage
between J400-7 and FG on the MCU
PWB.
Does the +5VDC measured between
J400-7 and FG remain relatively
constant throughout the print run, and
does not deviate more than a volt
during the print run?
Rev.B
Yes No
Go to Go to Stpe2
"Inoperative
Printer
Go to Step3 Replace the
LVPS
Assembly
Table 3-14. Erratic Operation
Step Actions and Questions
3 LVPS +24VDC UNDER LOAD
CHECK
1. Generate 50 Grid Test Patterns.
2. While the printing is generating the
Test Patterns, measure the voltage
between J400-5 and FG on the MCU
PWB.
Does the +24VDC measured
between J400-5 and FG remain
relatively constant throughout the
print run, and does not deviate more
than a few volts during the print
run?
4 TEST PRINT CHECK
Was the printer able to generate all
of the Test Prints requested in steps
2 and 3?
TEST PRINT CHECK
5
Does the printer stop and reset while
making test prints?
6 HOST SOFTWARE
MENT
Reload the Host Drive Software or Host
Application Software.
Does the printer still exhibit erratic
operation?
Chapter 3 Troubleshooting
Yes No
Go to step 4 Replace the
LVPS
Assembly.
(See
Chapter 4)
Go to step 5 Replace the
MCU PWB
(See
Chapter 4)
Go to FIP Go to step 6
Electrical
Noise
REPLACE- Go to step 7 Problem
solved
103