Read Sharp VC-M305HM (serv.man7) Service Manual online
• Before the adjustment:
cal parts such as video heads.
Check that the mechanism and all electric components are in good working condition prior to the adjustments,
otherwise adjustments can not be completed.
Screwdriver for adjustment
When the IC710 (E
Note that the servo circuit requires readjustments for the head switching point, slow and still modes.
1, VIDEO OUT jack to CH-2
(CH-1 trigger slope switch at (+),
Internal trigger at CH-1 side.)
2. Set to SLOW PB mode by pressing the SLOW key.
3. Transmit the TEST(R/C code 47H).Or short the TP801
make sure no noise appear.
Same with the SP, do the 1~5 items.(for LP )
2. Transmit the TEST code (R/C code 47H) to VCR.
(By doing this,LCD will all light up and become the PB
Tracking Center value.
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
ing Point is inside standard range.
finish the AUTO PG ADJ,by light off.
able to adjust the PG using FF key or REW key.
Vertical Sync) OF STILL PICTURE
2. Press the PAUSE/STILL key and STILL the picture.
3. As looking at the monitor, using the TRACKING UP+,
it is better to confirm that no perpendicular jitter appear.
the above diagram
(SP/LP mode)(See Note below)
Confirm the white peak frequency follow
the standard value.
(the deviation between shinkchip and f
white peak is 1MHz
left diagram <Diagram A>.
and weakness electrics signal.
put port using the 75
confirm the diagram same
as the left diagram.
Confirmation : make sure no black split at the mono-sco
picture during the self-Rec PB when the S-PICTURE is
ON with the S-PICTURE ON/OFF,make sure the picture
level at the wedge part is change.
(S-PICTURE OFF about 240 line)
on TEST KEY R/C) and select E-12ch.
on TEST KEY R/C) and select F-10ch.
on TEST KEY R/C) and select F-4ch.