VC-M321HM (serv.man3). Adjustment, replacement and assembly of mechanical units - Sharp VCR Service Manual (repair manual). Page 2

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10
VC-M321HM
VC-M331HM
MAINTENANCE CHECK ITEMS AND EXECUTION TIME
Perform the maintenance with the regular intervals as follows so as to maintain the quality of machine.
Parts
Maintained 500
hrs.
1000
hrs.
1500
hrs.
2000
hrs.
Guide roller ass’y
Sup Guide Shaft
Retaining guide
Slant pole
Full-erase head
Colour and beating
Upper and lower drum ass’y
Pinch roller
Capstan D.D. Motor
Reel belt
Idler ass’y
Tension band ass’y
Screen swaying
Loading Motor
Limiter pulley
Supply/take-up Main brake levers
Tape slack
AHC (Automatic Head Cleaner)
A/C head
NOTE          : Part replacement.        : Cleaning        : Apply grease
<Specified> Cleaning liquid Industrial ethyl alcohol
* This mechanism does not need electric adjustment with variable resistor. Check parts. If any deviation is found, clean
or replace parts.
Possible symptom
encountered
Lateral noises Head
occasionally blocked
Small sound or sound
distortion
Poor S/N ratio, no colour
Poor flatness of the enve-
lope with alignment tape
No tape running, uneven
colour
No tape running, tape
slack
No tape running, tape
slack, no fast forward/
rewind motion
Cassette not loaded or
unloaded
No tape running, tape
slack
Clean tape contact part with the
specified cleaning liquid.
Abnormal rotation or significant vibra-
tion requires replacement.
Remarks
Clean rubber and rubber con-
tact area with the specified clean-
ing liquid.
Clean tape contact area with the
specified cleaning liquid.
Replace the roller of the
cleaner when it wears
down.
Just change the AHC roller as-
sembly for new one.

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