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TROUBLESHOOTING
1. POWER PART
Turn power on.
YES
NO PN402, PN804 +5V(AII) NO
IC402 Pin 1 input +5V(D1) PN402, PN804 Defective.
check?
YES YES
IC402 Pin 6 PCTL output? IC802, 805 Surrounding
circuitry defective.
OFF ON 5V
NO