Troubleshooting Flowchart; Before Repairing A Fault; Troubleshooting - Oki ML490 Maintenance Manual

3.

TROUBLESHOOTING FLOWCHART

3.1

Before Repairing a Fault

Before servicing the printer, ask the customer in what situation the trouble occurred and record
the response.
Before starting troubleshooting, operate the printer in the same situation as that at the time of
trouble occurrence to see if the same trouble occurs again. If not, perform the printers self test
and thoroughly test the printers functionality. If the trouble is reproducible proceed to the
troubleshooting section.
3.2

Troubleshooting

(1) The data is not received using a serial interface.
(2) Using a serial interface, the print data is omitted or the print operation is not performed.
1
The data is not received using a serial interface.
(A protocol is set to READY/BUSY state, and BUSY LINE is in SSD + state.)
Is the OSC oscillation waveform as specified in Figure C-4?
Yes Is a RST signal in Q3 is as specified in Figure C-5?
A
42114101 Rev.1
90ns
V
No Replace the OSC.
No Check the RST circuit on the Control Board.
T (ns)
Figure C-4
5V
0V
Figure C-5
+ 4 to + 5V
0 to + 1V
132 /