
- 12 -
Fig. 6
3-7 WDT alarm, BRK command alarm
• Is the alarm canceled by turning on power?
• No Replace ROM, Q1 or the Power & Control Board.
3-8 NMI alarm
• Is the alarm canceled by turning on power?
• No Replae Power & Control Board.
3-9 Printer external RAM alarm.
• Do signal of Q3, Q4 (DRAM) of the Power & Control Board such as RAS-N, CAS-N, OE,
WE have the waveforms shown in Fig. 7?
RAS-N (Q3, Q4-5)
CAS-N (Q3, Q4-16)
RD-N (Q3, Q4-1)
WRL-N (Q3, Q4-4)
• No Is the dumping resistance of each signal broken?
Check Q502 (Power & Control Board)?
• Yes Replace the dumping resistance or Q502
▼
• No
▼
• Yes Replace Q3, Q4.
EECS-P
EECLK-P
EEDIN-P
EEDOUT-P
MIN
100 ns
MIN
100 ns
MIN
500 ns
MIN
50 ns
MIN
450 ns
MIN
450 ns
MIN
0 ns
MIN
500 ns
MIN
100 ns
+5V
0V
+5V
0V
+5V
0V
+5V
0V
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