
- 9 -
At the rising edge of PSEN-N and RD-N/WRL-N, the bus line level is decisively
set to “H” or “L”.
• No Replace Q501 of the Power & Control Board.
▼
• Yes Does the OPCLK-N/OPTXD signal arrive at CN1 of the operation panel?
See Fig. 5.
OPCLK-N (CN1-3 pin)
OPTXQ (CN1-4 pin)
• No Is the flexible calbe of the operation panel connected without break?
• No Replace the flexible cable.
▼
• Yes Replace CN3 of the Driver Board.
▼
• Yes Does the OPRXD signal arrive at CN1 of the operation panel? See Fig. 5.
OPRXD (CN1-2 pin)
• No Replace IC1 of the operation panel.
▼
• Yes Does the OPRXD signal arrive at CN3 of the Driver Board? See Fig. 5.
• No Is the flexible cable of the operation panel connected without break?
• No Replace the flexible cable
▼
• Yes Replace CN3 of the Driver Board.
▼
• Yes Replace Q501 of the Power & Control Board.
▼
• Yes Do bus line signals of 4C (67 x 640) of the Power & Control Board such as ALE-
P, PSEN-N, LSICS-N and RDN/WRL-N have waveforms as shown in Fig. 4?
Fig. 4
ALE-P
LSICS-N
PSEN-N
RD-N/WRL-N
62 ms
102 ms
203 ms
76 ms
+5V
0V
+5V
0V
+5V
0V
+5V
0V
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