VC-V50S
VC-V80T
VC-V91T
37
FLOW CHART NO.8 CASSETTE CONTROL TROUBLESHOOTING(1)
A cassette tape is not taken in.
Is the cassette housing distorted?
Fix or replace the cassette housing.
NO
YES
YES
YES
YES
NO
YES
NO
YES
NO
NO
NO
Check start sensor cover.
Check line between start sensor and
all the way up to pin(4) of IC801.
Check line between IC801 and all the
way up to pin(11) of IC706.
Check IC706.
Check line between IC706 and all the
way up to loading motor.
Replace loading motor.
Is the specified voltage, (about 10V)
applied at the loading motor terminal
when the cassette tape is inserted?
Does pin(13) of IC706 change to
about 10V when the cassette tape is
inserted?
Does pin(11) of IC706 go to a "H"
(about 0.7V) level when the cassette
tape is inserted?
Does pin(4) of IC801 change 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?
FLOW CHART NO.6 SYSTEM CONTROL TROUBLESHOOTING(2)
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 pin(2) of IC801,
when the keys are activated?
Peplace IC801.
YES
YES
NO
Check peripheral circuit of pin(2) of IC801,
and the function keys.
0.000V ~ 0.325V
OPERATE
NO
Key-in input is not received.
0.325V ~ 0.945V
STOP/EJECT
0.945V ~ 1.580V
PLAY
1.580V ~ 2.185V
FF
2.185V ~ 2.810V
REW
2.810V ~ 3.430V
PAUSE/STILL
3.430V ~ 4.045V
REC
4.045V ~ 4.680V
S.S. PICTURE
4.680V ~ 5.000V
no key
FLOW CHART NO.7 INFRARED R/C TROUBLESHOOTING
No operation is possible from the infrared remote control.
Operation is possible from the VCR,
but no operation is possible from the
infrared remote control.
Is the supply voltage of 5V fed to
pin(2) terminal of remote control
receiver?
Check AT 5V and GND lines.
Is "L" pulse sent out pin(1) terminal
receiver when the infrared remote
control is activated?
Replace the remote control receiver
or replace the remote control
transmitter if necessary.
Is inputted to pin(73) of IC801?
Check between at pin(1) of terminal
receiver and all the way up to
pin(73) of IC801.
YES
YES
NO
NO
NO
YES
Replace IC801.
YES
Содержание VC-V50S
Страница 46: ...VC V50S VC V80T VC V91T 8 BLOCK DIAGRAM SYSTEM SERVO BLOCK DIAGRAM 46 47 ...
Страница 48: ...VC V50S VC V80T VC V91T 50 POWER CIRCUIT BLOCK DIAGRAM ...
Страница 58: ...VC V50S VC V80T VC V91T 66 A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 LED PWB VC V91T OPERATION PWB ...
Страница 73: ...Ref No Part No Description Code Ref No Part No Description Code VC V50S VC V80T VC V91T 81 ...