Table of Contents
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4. Front Circuit (Digitron & Key)
START
Is LED On?
YES
Power On
Is LED Off ?
YES
Does bar appear
on FLD ?
YES
Does all the buttons
work normally?
YES
Does remote control
work normally?
YES
OK
NO
Is 5.2V applied
to CN61 Pin 12 ?
NO
Check Power Circuit.
YES
NO
Is HIGH State appear
on IC91 Pin 2 ?
NO
Does "Main Error"
appear on FLD?
YES
NO
Check waveform of
IC91 Pin 14
YES
Check R904, 906, 909, 910,
R911, 916, 919, 924
NO
Does waveform of
IC92 Pin 1 appear?
YES
Is IC91 Pin 24 connected
to IC92 Pin 1 ?
YES
Replace IC91
YES
Check L901
Check Q901, Q904, D902
NO
Check the oscillation of X901
and Replace IC91 or X901
NO
Check Power Circuit
NO
Check S902-S907, S909
Check Solder
NO
Is 5V applied to
IC92 Pin 3 ?
NO
Replace IC92
Check Solder
2-7
NO
YES
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