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Trouble
Probale cause
Check point
12) The unit doesn't start recording
at set time by the timer.
o
When the preset time arrives, check if
pin ©) of EC becomes "'high"' level.
13) Cassette cannot be taken out.
—
Check for base input voltage of eject solenoid
driver-at pin @) of EF.
14) Loading motor stops in the
midst of loading.
15) The unit stops irregularly in
the midst of playback or
recording.
—.
o
Flaw in tape.
o
Take-up reel is stopping.
o
Cassette lamp is broken.
{A protective circuit is built in, which is
designed to prevent loading motor from
operating more than 10 seconds continu-
oulsly.]
o
End sensor.
o
Reel sensor pulse.
o
Lamp breakage sensor.
16) Drum motor and capstan motor
L
can't be muted.
o
Check if Q809 and Q810 are normal.
17) Play, record and FF lamps
light up, but the mechanism
does not work.
83
o
Check if EF connector is normal.
Check if loading arm is locked in the midway.
TROUBLESHOOTING OF VIDEO SEARCH CIRCUIT
Trouble
~T!
O°
|
Probable cause
Check point
1801 is defective.
The unit is in AUDIO DUB mode.
The unit is in STILL mode.
Check if pin (2) of 1801 is at "high"
level.
Check if pin (3) of 1801 is at "high"
level.
Check if video search switch is normal.
Check if VS speed signal (at pin @ of
EG) is at '"'high"' level.
2) FV signal doesn't appear.
Head switching pulse doesn't
appear.
1707 is defective.
84
Check if pins GB) and @3) of I707 are at
"high"? level.
Check if head switching pulse is found at
pins (3) and
a) of 1707.
Check if there appear pulses (ca. 200ps) at
pins @) and (9) of 1707.
Check if pin G) or @ of AF is at "high"
level.
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