Oki ML490 Maintenance Manual - Page 134
Are RxD and SSD of Q3 as specified in C-7?
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2 In receiving by serial interface, printing data is omitted or printing operation is not performed. Are RxD and SSD of Q3 as specified in Figure C-7? No Replace the Q2. Yes Are, WR, and BUS signals of Q3 pin 3 as specified in Figure C-8? 542ns WR 5V 0V Q3-3 5V 0V Figure C-8 No Replace the Q3. Yes Is the level of a BUS signals at Q7 pins 2-9 the same as that of DB0-7 when WR signal is started? No Replace the Q7. Yes Is 4 pin of Q6 identical to WR signal in Figure C-8? No Replace the Q6. Yes Check Q3 in the Control Board. 42114101 Rev.1 134 /
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42114101
Rev.1
134 /
2
In receiving by serial interface, printing data is omitted or printing operation is not performed.
Are RxD and SSD of Q3 as specified in Figure C-7?
No
Replace the Q2.
Yes
Are, WR, and BUS signals of Q3 pin 3 as specified in Figure C-8?
No
Replace the Q3.
Yes
Is the level of a BUS signals at Q7 pins 2-9 the same as that of DB0-7 when
WR signal is started?
No
Replace the Q7.
Yes
Is 4 pin of Q6 identical to WR signal in Figure C-8?
No
Replace the Q6.
Yes
Check Q3 in the Control Board.
Figure C-8
542ns
5V
0V
5V
0V
WR
Q3-3