Sharp VC-G20SM Serviceanleitung Seite 28

VC-G20SM/G200SM
VC-G201SM/G401SM
SERVO CIRCUIT ADJUSTMENT
ADJUSTMENT OF HEAD SWITCHING POINT
Measuring Oscilloscope
instrument
Mode Playback
Cassette Aligment Tape (VROCBZF)
Test point Pin(2) of TP201 (H.SW.P.) to CH-
1, VIDEO OUT jack to CH-2
(CH-1 trigger slope switch at (+),
Internal trigger at CH-1 side.)
6.5 ± 0.5H (lines)
Specification
1. Insert the Aligment Tape (VRO-CBZF) and set to PB Mode.
2. Transmit the TEST code (R/C code 47H) to VCR.
Or, once, short the TP801 at the main PWB
(By doing this,LCD will all light up and become the PB
Tracking Center value.
~ As for the recover equipment,prepare the memory-remote
control.
But,while adjust the running, at non cassete control unit
condition but have the cassete control JP(TP801 short on
the main PWB), if press TRACKING UP and DOWN key at
the same time, it'll become the TRACKING CENTER (for
Running Ajustment)
3. Again, transmit the PLAY (PB), or Press PLAY Key.After
AUTO PG ADJ mode is finished, make sure the PB Switch-
ing Point is inside standard range.
~ During Flashing of PLAY(casette mark) is AUTO PG ADJ,
finish the AUTO PG ADJ,by light off.
~ When using the manual PG ADJ,finish the No.2, and it is
able to adjust the PG using FF key or REW key.
TRIG INT CH-1,H:50 µsec/div
CH-2
Video output
CH-1 6.5H
V: 2V/div
ADJUSTMENT OF PAL SYSTEM SP/LP SLOW
TRACKING PRESET
Measuring
instrument
Mode
Cassette
Control
Specification
1. PB the self-REC tape.
2. Set to SLOW PB mode by pressing the SLOW key.
3. Transmit the TEST(R/C code 47H).Or short the TP801
on the main PWB once.
4. Adjust the noise bar at the botton of monitor screen
using TRACKING UP,DOWN key until it dissapear.
5. Press the PB key to PB and during this time, press the
PB/STILL for few times repeatedly and during STILL
make sure no noise appear.
Same with the SP, do the 1~5 items.(for LP )
~. For LP, skew will appear at the above. (Only for VC-
G401SM)
ADJUSTMENT OF PAL SYSTEM FV (False
Vertical Sync) OF STILL PICTURE
Measuring
instrument
Mode
Cassette
V: 1V/div
Control
Specification
1. PB the self-REC tape.
2. Press the PAUSE/STILL key and STILL the picture.
3. As looking at the monitor, using the TRACKING UP+,
DOWN− adjust till the perpendicular jitter dissapear.
~
For the LP also, while PB the self-REC tape, for STILL,
it is better to confirm that no perpendicular jitter appear.
28
Monitor Screen
Playback
Self-recorded tape
(SP/LP mode)
Tracking control buttons (]) or ([)
Minimized noise on
monitor screen
Monitor Screen
Playback still
Self-recorded tape
(SP/LP mode)
Tracking control buttons (]) or ([)
No vertical jitter of picture