37
VC-AA350A/L/M/W
VC-AA352W,AA360A,AA370A
VC-AA550A/L/W,AA560A,AA570A
FLOW CHART NO.7 KEY CONTROL TROUBLESHOOTING
Does the key switch make good
contact, when the cassette tape is
inserted?
Check switch contact.
Is there the function control voltage
inputted at the pins(88) and (89) of
IC701, when the keys are activated?
Replace IC701.
Check peripheral circuit of pins(88)
and (89) of IC701, and the function
keys.
YES
NO
NO
YES
Key-in input is not received
<Except for jog shuttle mode
.>
SWITC
FUNCTION
SWITC
FUNCTION
VOL
T
.REF
.
Ref No. Ref No.
S805
SET
S801
POWER
0.000V
S806
CH(+)
S802
EJECT
0.652V
S807
T.Speed/P
AUSE
S803
MENU
1.250V / 1.864V
S808
P
AUSE/REC
S804
CH(-)
1.864V /
2.561
V
S883
REC
S881
PLA
Y
2.561V
S884/S885
REW
S882
ST
OP
3.081V
S886/S887
FF
No Use
No Use
3.694V
No Use
No Use
TP801
TEST
3.712V
No Use
No Use
TP802
CASSETTE
4.285V
KEY
-1 IN
KEY
-0 IN
(Pin88 of IC701)
(Pin89 of IC701)
A/D KEY
INPUT
SPECIFICA
TION:-
FLOW CHART NO. 6 TIMER TROUBLESHOOTING
The LCD display fails to light up.
Is the supply voltage of 5V fed to
pin(37) of IC8001?
Check
A
T
5V line.
Is the supply voltage of 3.4V
, 1.7V
feed to pin(38) and pin(39) of IC8001?
Check pin(38), (39) of IC8001
and peripheral circuits.
Is it possible to confirm signals
LCD RESET
, LCD CS, LCD CLOCK
and LCD DA
T
A
on the pins(36),
(42), (43) and (44) of IC8001?
Are the segment signals
supplied to the LCD display
(LC8001) fromthe driver IC
(IC8001)?
Check peripheral circuit of pin(41)
of IC8001.
Check that the LCD display is
free from damages such as
crack.
Replace IC8001.
YES
YES
YES
YES
NO
NO
NO
NO
NO
Check the signal line between
IC701 and IC8001.
YES
IC8001 present?
Is the OSC signal at pin(41) of