OKI Microline ML320/321 Troubleshooting Manual
This troubleshooting flow chart is created for the purpose of repairing the ML320/321 printed circuit board assemblies. Those who are engaged in the repair work are expected to have an adequate level of experience and ability.
The following tools are required for ordinary repair work in addition to generally used tools.
Osci I loscope
Approximately 100 MHz
Soldering iron
Any soldering iron available on the market (preferably with a pointed tip)
A special soldering iron
set can be used to work
more efficiently
Troubleshooting Items
One of the operating voltages is missing.
(1-1) There is no + 40V output
(1-2-) There is no + 8V output
(1-3) There is no + 5V output
(7) There is no 1 OV AC output
(1-5) There is no output
Only the power lamp is illuminated.
Printer alarm occurs,
(TQ
Internal CPU RAM error
(TJ ROM error
( 3 - 3 ) RAM error 0 3 4
Serial interface error
( 3-5 Spacing error
Printing wrong character or some characters are not printed.
Line feed malfunction.
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