Problem Isolation - Epson FX-870 Service Manual

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Troubleshooting

Problem Isolation

Most printer problems can be corrected by replacing the defective unit. First, identify the
problem from the symptoms you observe using the table below. Then, follow the instructions in
the corresponding flowchartto correct the problem.
Symptom
Printer dead, or abnormal
operation at power on.
Carriage does not move, or
carriage operation abnormal.
Paper does not feed, or
paper feeds abnormally.
Self-test printout has poor
quality.
Printing is darker on one
side of the page than on
the other side.
Printing is intermittently
dark and light.
Data from the host is
printed incorrectly. (Host is
assumed to have checked
out OK with another printer.)
3-6
Table 3-8. Symptoms and Flowchart References
Possible Problems .
Possible power supply voltage problem.
l
A motor or printhead may be shorted.
l
. CO94 MAIN board may be bad.
Something in the mechanism may be catching.
l
Sprocket or ribbon driie gears may be stuck or broken.
l
CR HOME sensor may be bad.
l
Carriage motor may be bad.
l
Driver for CR on CO94 MAIN board may be bad.
l
Something in the mechanism may be catching.
l
Paper feed motor may be bad.
l
l
Platen gap may be incorrect.
l
Printer may need bidirectional adjustment.
l
Head cable may be bad.
l
l
Printhead drivers on CO94 MAIN board may be bad.
l
Platen may not bs parallel to carriage guide shaft.
l
Ribbon may be bad.
l
Ribbon mask may be damaged.
l
Sprocket or ribbon drive gears may be stuck or broken.
l
Platen gap may be incorrect.
l
Printer default settings may be wrong for application.
l
Interface cable may have a problem.
l
Software settings may be incorrect for printer.
l
Possible problem with ROM or CO94 MAIN board.
l
Flowchart
or Solution
See
Chart 1.
See
chart 2.
See
Chart 3.
See
Chart 4.
gap adjustment.
See
Chart 5.
See
Chart 6.
E p s o n F X - 8 7 0 0 1 7 0

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