Outline; Tools; Troubleshooting Items - Oki MICROLINE ML320 Maintenance Manual

4. Outline

This troubleshooting flow chart is created for the
circuit board assemblies. Those who are engaged
adequate level of experience and ability.

Tools

The following tools are required for ordinary repair work in addition to generally used tools.
Osci I loscope
Soldering iron

3. Troubleshooting Items

One of the operating voltages is missing.
(1-3) There is no + 5V output
Only the power lamp is illuminated.
Printer alarm occurs,
Internal CPU RAM error
( 3 - 3 ) RAM error
3 4 Serial interface error
( 3-5 Spacing error
Printing wrong character or some characters are not printed.
Line feed malfunction
Approximately 100 MHz
Any soldering iron available on the market (preferably with a pointed tip)
A special soldering iron
purpose of repairing the ML320/321 printed
in the repair work are expected to have an
set can be used to work
l - l
more efficiently.