A SERVICE OF

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5-17
BJC-7100
Part 5: Maintenance
Check motor drive voltage.
OK?
Check carriage motor.
OK?
Replace carriage motor.
Check power cable.
No
Yes
Yes
No
A
OK?
Replace AC adaptor. Replace power cable.
No
Yes
Check the connection and conductivity
of the power cable that links the logic
board with the AC adaptor.
Measuring point
Logic board CNPWR
Pin No. 3
Normal value
27.6 ± 1.5VDC (no load max 33V)
Measuring point Normal value
Approx. 8.3CNCR
1-4
2-3
Replace logic board.
• Faulty motor driver IC
• Faulty MPU
• Faulty PCB
soldering/conductivity
1
4
Red 1
2
3
4
A
B
B
A
Approx.
8.3/phase
Carriage motor
Blue
Orange
Yellow
Logic board side
AC adaptor side
1
2
3
4
5
6
7
8