VC-M305HM (serv.man7). Electrical adjustments - Sharp VCR Service Manual (repair manual). Page 2

Measuring
instrument

Mode

Cassette

Oscilloscope

Playback

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.)

Specification

6.5 

±

 0.5H (lines)

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.

Measuring
instrument

Mode

Cassette

Monitor Screen

Playback

Self-recorded tape
(SP/LP mode)

Control

Tracking control buttons (

]

) or (

[

)

Specification

Minimized noise on
monitor screen

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.

Measuring
instrument

Mode

Cassette

Monitor Screen

Playback still

Self-recorded tape
(SP/LP mode)

Control

Tracking control buttons (

]

) or (

[

)

Specification

No vertical jitter of picture

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.

CH-2

Video output

CH-1

V: 2V/div

V: 1V/div

TRIG INT CH-1,H:50 

µ

sec/div

6.5H