Oki ML490 Maintenance Manual - Page 132

Before Repairing a Fault, Troubleshooting

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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? 90ns + 4 to + 5V V T (ns) 0 to + 1V Figure C-4 No Replace the OSC. Yes Is a RST signal in Q3 is as specified in Figure C-5? 5V 0V Figure C-5 No Check the RST circuit on the Control Board. A 42114101 Rev.1 132 /

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42114101
Rev.1
132 /
No
Check the RST circuit on the Control Board.
A
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?
No
Replace the OSC.
Yes
Is a RST signal in Q3 is as specified in Figure C-5?
Figure C-4
Figure C-5
V
T (ns)
+ 4 to + 5V
0 to + 1V
90ns
5V
0V