Troubleshooting - Sharp VC-GH60SM Serviceanleitung

FLOW CHART NO.6 POWER TROUBLESHOOTING(6)
In case of output voltage at low level.
NO
Check peripheral circuits IC901, IC903,
C9336, R932, R930 and R933.
YES
NO
Check C901 and peripheral circuits of
IC901.
YES
NO
Check short-circuit or leak of T901.
YES
Check primary circuit and peripheral
circuit of Q901 and Q902.
FLOW CHART NO.7 KEY CONTROL TROUBLESHOOTING(2)
Key-in input is not received
<Except for jog shuttle
Does the key switch make good
NO
contact, when the cassette tape is
inserted?
YES
Is there the function control voltage
NO
inputted at the pins(88) and (89) of
IC701, when the keys are activated?
YES
SWITC
Replace IC701.
Ref No.
S805
S806
S807
S808
S883
S884/S885
S886/S887
-
-
KEY-1 IN
(Pin88 of IC701)
The result of IC901, IC903, C9336, R932,R930 and
R931. Replace where necessary.
Replace IC901.
Replace T901.
mode.>
Check switch contact.
Check peripheral circuit of pins(88)
and (89) of IC701, and the function
keys.
FUNCTION SWITC FUNCTION TERMINAL
Ref No. VOLTAGE
SET S801 POWER 0.000V
CH(+) S802 EJECT 0.652V
TAPE SPEED / PAUSE S803 MENU 1.250V / 1.864V
PAUSE / REC S804 CH(-) 1.864V / 2.561V
REC / NO USE S881 PLAY
REW S882 STOP 3.081V
FF TP801 TEST 3.694V
- TP802 CASSETTE 4.279V
- - - 5.000V
KEY-0 IN
(Pin89 of IC701)
FLOW CHART NO.8 INFRARED R/C TROUBLESHOOTING
No operation is possible from the infrared remote control.
Does the infrared remote control NO
function?
YES
Is the supply voltage of 5V fed to pin(2)
NO
of RMC801?
YES
Is "L" pulse sent out from pin(1) of the
NO
receiver when the infrared remote control
is activated?
YES
Check between at pin(1) of receiver and
NO
all the way up through to pin (4) of IC701.
FLOW CHART NO.9 CASSETTE CONTROL TROUBLESHOOTING(1)
A cassette tape is not take in.
NO
Is the cassette housing distorted?
YES
Does the start sensor cover go to open NO
when the cassette tape is inserted?
YES
Does pin(87) of IC701 change from"H"
NO
to "L" level when the cassette tape is
inserted?
YES
Does pin(10) of P701 go to a "H" level
NO
when the cassette tape is inserted?
YES
Check IC on mechanism.
NO
Does IC on mechanism output to about
10V when the cassette tape in inserted?
YES
Is the specified voltage applied at the
NO
loading motor terminal when the cassette
tape is inserted?
YES
Replace loading motor.
Replace infrared remote control as
required.
Check AT 5V and GND lines.
Replace receiver.
Replace IC701.
Fix or replace the cassette housing.
Check start sensor cover.
Check line between start sensor and
pin (87) of IC701
Check line between pin (92) of IC701
and pin(10) of P701.
YES
Is the supply voltage of 12V fed to pin
(8) of P701?
NO
Check M 12V lines.
Check line between IC on mechanis
and loading motor.