PCB TEST MODE Procedure
MAIN
RAM (IC8,9), ROM
(IC6) check
1. Connect the CHECKING DEVICE to CN9 on the MAIN P.C.B., and turn on the CHECKING DEVICE s
2. Turn on the power switch.
CPL
CPU (IC1) check
1. Connect the CHECKING DEVICE to CN9 on the MAIN P.C.B. (the Checking Device switch should be
2. Press and hold the two D keys shown below, and then turn on the power switch.
When the power switch is turned on, the LED of the CHECKING DEVIC
flashes 8 times. The first 4 flashes are for the RAM check, and the later
flashes are for the ROM check. The order of the LED flashes correspon
the respective IC numbers as shown below. If an IC is defective, the
corresponding flash time is longer.
Connection between serving CHECKING DEVICE and MAIN P.C.B.
13
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