
48
VC-A582U
VC-A582U(A)
VC-H982U
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
FLOW CHART NO.23 Hi-Fi TROUBLESHOOTING
No Hi-Fi E-E sound heard.
Audio signal input from tuner.
Line Audio signal input.
Is audio signal
inputted to pins (6)
(L-CH), (44)
(R-CH) of IC651?
Check line
between MTS
decoder circuit and
the Hi-Fi circuit.
Is audio signal
inputted to pin (61)
(L-CH) and (52)
(R-CH)of IC651?
Check lines
between the
audio input
terminal and Hi-Fi
circiut.
Are serial data and serial
clock at pins (31) and (32) of
IC651?
Check IC651 and IC701, and
all the way thru between ther.
Is "H" level applied at pin (8)
of IC651?
Check between pin (8) of
IC651 and all the way up
thru to pin (21) of IC701.
Line coupling: Is audio signal outputted at pins (58) and (56) of IC651?
RF coupling : Is audio signal outputted at pin (57) of IC651?
Line coupling: Check line ranging from pins (58) and (56) of IC651 to the audio
output terminal.
RF coupling : Check line ranging from pin (57) of IC651 to the audio input terminal
pin (2) of tuner (TU101).
Replace IC651.
Hi-Fi sound cannot be recorded (E-E mode is normal).
Is 600 mVp-p record FM signal (L-ch) output to the
IC651 pin 29 monitor terminal?
YES
YES
YES
NO
NO
NO
Is record FM signal output to the IC651 pins 26 to
22 (ch-1)/pins 26 and 25 (ch-2)?
Check the AA-MZ connector.
Is the IC651 pin 33 in BIAS CTL (L) state?
Check the record current setting resistor R353 of IC651 pin 27.
Check BIAS CTL (L) line.
Replace IC651.
FLOW CHART NO.24
Hi-Fi sound cannot be played back (E-E mode is normal).
Is playback envelope signal output to the IC651
pins 19 and 18? (300 mVp-p)
YES
YES
NO
NO
Replace IC651.
Replace IC651.
Is A-H.SW.P input into the IC651 pin 35?
Check the A-H.SW.P. line from the IC651
pin 35 to the IC701 pin 26.
FLOW CHART NO.25
Recording in linear audio is impossible (Hi-Fi E-E mode is normal).
YES
YES
YES
YES
NO
NO
NO
Is audio signal input into the IC201 pin 8?
Is the IC201 pin 99 in "L" level?
Does the bias oscillation circuit operate normally?
Is audio signal on which bias signal is superposed
output to the IC201 pin 6?
Check the AA-MZ harness and A/C head.
Check the bias oscillation circuit (T601, Q602,
Q603, Q604).
Check the line between the IC651 pin 53 to the
IC201 pin 8.
Check the periphery of IC201 pin 99.
FLOW CHART NO.26
Содержание VC-A582U
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