−107−
(3) Electrical components
Troubles Cause (1) Cause (2) Checking order and adjusting method
1. The display fails to light.
2. A key switch on the operation panel fails
to work.
1-1) The power is not supplied to the
POWER circuit board.
1-2) The power is not supplied to the
MAIN circuit board.
1-3) Operation panel ←→ Main circuit
board are not connected.
1-4) Trouble on the MAIN circuit board
2-1) Failure with the switch
2-2) Failure with the circuit board
1-A) Disconnected J30 connector
1-B) Fuse F1 or F2 has blown.
2-A) Disconnected J37 connector
(POWER circuit board)
2-B) Disconnected J16 connector (MAIN
circuit board)
2-C) Fuse F3 has blown.
2-D) Fuse F6 has blown.
3-A) Disconnected J23 connector (MAIN
circuit board)
4-A) Direction of the system ROM is
reverse.
4-B) System ROM is not correctly
inserted.
4-C) Wiring pattern near the data ROM
has broken.
Securely connect the connector.
Replace the fuse after removing the cause. (10A)
Securely connect the connector.
Replace the fuse after removing the cause. (F3 = 10A), F6 = 3A)
Securely connect the connector.
Correctly insert it.
Replace the MAIN circuit board.
Look for the defective switch using the input check mode CP-1 and
replace the operation box or the operation circuit board.
Replace the operation box or the operation circuit board.
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