Read Sharp VC-M315HM (serv.man7) Service Manual online
40
VC-M305HM/LM
VC-M315HM/LM
SWITC
FUNCTION
SWITC
FUNCTION
TERMINAL
Ref No. Ref No.
VOLTAGE
S805
SET
S801
POWER
0.000V
S806
CH(+)
S802
EJECT
0.652V
S807
PAUSE
S803
MENU
1.864V
S808
REC
S804
CH(-)
2.561V
S883
NO USE
S881
PLAY
S884/S885
REW
S882
STOP
3.081V
S886/S887
FF
TP801
TEST
3.694V
-
-
TP802
CASSETTE
4.279V
-
-
-
-
5.000V
KEY-1 IN
KEY-0 IN
(Pin88 of IC701)
(Pin89 of IC701)
Is the cassette housing
distorted?
distorted?
NO
YES
YES
YES
YES
NO
YES
NO
NO
YES
NO
YES
FLOW CHART NO.8 CASSETTE CONTROL TROUBLESHOOTING(1)
A cassette tape is not take in.
NO
NO
Check start sensor cover.
Check line between start sensor
and pin(87) of IC701.
and pin(87) of IC701.
Check line between pin(92) of
IC701 and pin(10) of P701.
IC701 and pin(10) of P701.
Is the supply voltage of 12V fed
to pin(8) of P701?
to pin(8) of P701?
Check M 12V lines.
Check IC on mechanism.
Check line between IC on mechanism
and loading motor.
and loading motor.
Replace loading motor.
Is the specified voltage applied
at the loading motor terminal
when the cassette tape is inserted?
at the loading motor terminal
when the cassette tape is inserted?
Does IC on mechanism output
about 10V when the cassette
tape in inserted?
about 10V when the cassette
tape in inserted?
Does pin(10) of P701 go to a
"H" level when the cassette tape
is inserted?
"H" level when the cassette tape
is inserted?
Does pin(87) of IC701 change
from "H" to "L" level when the
cassette tape is inserted?
from "H" to "L" level when the
cassette tape is inserted?
Does the start sensor cover go
to open when the cassette tape
is inserted?
to open when the cassette tape
is inserted?
Does the key switch make good
contact, when the cassette tape is
inserted?
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?
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.
(89) of IC701, and the function keys.
YES
NO
NO
YES
Key-in input is not received
FLOW CHART NO.7 INFRARED R/C TROUBLESHOOTING
No operation is possible from the infrared remote control.
Does the infrared remote control
function?
function?
Replace infrared remote control
as required.
as required.
Is the supply voltage of 5V fed to
pin(2) of RMC801.
pin(2) of RMC801.
Check AT 5V and GND lines.
Is "L" pulse sent out from pin(1) of
the receiver when the infrared remote
control is activated?
the receiver when the infrared remote
control is activated?
Replace receiver.
Check between at pin(1) of receiver
and all the way up thru to pin(4) of
IC701.
and all the way up thru to pin(4) of
IC701.
Replace IC701.
YES
NO
YES
NO
NO
NO
YES
A/D KEY INPUT
SPECIFICATION:-
FLOW CHART NO.6 TIMER TROUBLESHOOTING (2)
Fix or replace the cassette
housing.
housing.
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