Sharp VC-H992U Service Manual page 12

VC-H992U
VC-H992U(A)
MAINTENANCE CHECK ITEMS AND EXECUTION TIME
Perform the maintenance with the regular intervals as follows so as to maintain the quality of machine.
Maintained 500
Parts
Guide roller ass'y
Sup guide shaft
Reverse guide
Slant pole or pole base
Full erase head
A/C head
Upper and lower drum ass'y
Capstan D.D. motor
Pinch roller
Reel belt
Tension band ass'y
Loading motor
Idler ass'y
Limiter pulley
Supply/take-up main brake levers
AHC(Automatic head cleaner)
NOTE: : Part replacement.
<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.
1000 1500 2000
hrs. hrs. hrs. hrs.
: Cleaning : Apply grease
12
Possible symptom
encountered
Lateral noises Head
occasionally blocked
Colour and beating
Small sound or sound dis-
tortion
Poor S/N ratio, no colour
Poor flatness of the envelope
with alignment tape
No tape running, uneven col-
our
No tape running, tape
slack
No tape running, tape
slack, no fast forward/re-
wind motion
Screen swaying
Cassette not loaded or un-
loaded
No tape running, tape
slack
Tape slack
Remarks
Abnormal rotation or significant vi-
bration requires replacement.
Clean tape contact part with
the specified cleaning liquid.
Clean tape contact area with
the specified cleaning liquid.
Clean rubber and rubber
contact area with the speci-
fied cleaning liquid.
Replace the roller of the
cleaner when it wears down.
Just change the AHC roller
assembly for new one.