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CPU (U5) pins 52 to 55, pins 56 to 59, and pins 1 and 81 are also used for the carriage motor drive
circuit, paper feed motor drive circuit, and operation panel control circuit. The pins are used to
read DIP switches temporarily immediately after the printer initialization (or the power is
turned on).
U5
(*1): Resistance between E and B is used for pull-up resistors in the transistor.
+5V
{ 5V
(*1)
Q14 Q15 Q16 Q17 Q18 Q19 Q20 Q21
52
P20
53
P21
54
P22
55
P23
56
P90
57
P91
58
P92
59
P93
1
2
3
4
5
D24 D23 D22 D21 D20 D19 D18 D17
1
P57
80
P56
+5V
+5V
{ 5 V
R33
Q38
3
P100
+5 V
R32
Q28
4
P101
Figure 2-24 DIP switch read circuit
— 49 —
Q36 Q35
DSW1
6
7
8
1
D14 D25
{ 5 V
R29
Q39
DSW2
2
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Troubleshooting
