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Fault in the digital signal processor system
Fault in the digital signal processor system
YES
Are there normal 3Vp-p pulse
outputs (video signal) available at
Pins 122 to 159 (except for the
VDD, GND, and JL connector
terminals) of IC8501?
NO
Are pulses of 3Vp-p (video signal)
normally generated at Pins 80 to
98 (except for VDD and VSS) of
IC7506?
NO
Fault in peripheral circuits of IC8501
Are pulses of 3Vp-p (video signal)
normally generated at Pins 1 to 24
(except for VCC, GND, and CE)
of IC7503?
NO
Fault in peripheral circuits of IC7506
Are pulses of 3Vp-p (video signal)
normally generated at Pins 45 to
122 (except for VDD, GND, VO,
DE, and HO) of IC6502?
NO
Fault in peripheral circuits of IC7503
Is the input any of the VIDEO, DVD, RGB VIDEO inputs?
YES
Fault in peripheral circuits of IC9004
YES
YES
YES
Fault in peripheral circuits of IC8701
YES
Are pulses of 3Vp-p (video signal) normally
generated at Pins 70 to 98 (except for VDD
and VSS) of IC7506?
Are pulses of 3Vp-p (video signal) normally
generated at Pins 1 to 36 (except for VCC, GND,
CE, and MSEL) of IC7503?
YES
Fault in peripheral circuits of IC7506
Are pulses of 3Vp-p (video signal) normally
generated at Pins 122 to 159 (except for the VDD,
GND, and JL connector terminals) of IC8501?
YES
Fault in peripheral circuits of IC7503
Are pulses of 3Vp-p (video signal) normally
generated at Pins 91 to 150 (except for VDD
and GND) of IC8701?
YES
Fault in peripheral circuits of IC7503
Are pulses of 3Vp-p (video signal) normally
generated at Pins 45 to 122 (except for VDD,
GND, VO, DE, and HO) of IC6502?
YES
Fault in peripheral circuits of IC8701
TROUBLESHOOTING
NO
NO
NO
NO
NO
4-2
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