Sharp DV-NC70U Service Manual - Page 16

Maintenance Check Items And Execution Time

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DV-NC70U/C DV-NC72U 8-2 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 1000 1500 2000 hrs. hrs. hrs. hrs. Guide roller ass'y Possible symptom encountered Remarks Abnormal rotation or significant vibration requires replacement. Sup guide shaft Reverse guide Lateral noises Head occasionally blocked Clean tape contact part with the specified cleaning liquid. Slant pole on 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 Color and beating Small sound or sound distortion Poor S/N ratio, no color Poor flatness of the envelope with alignment tape No tape running, uneven color No tape running, tape slack No tape running, tape slack, no fast forward/ rewind motion Clean tape contact area with the specified cleaning liquid. Clean rubber and rubber contact area with the specified cleaning liquid. Screen swaying Cassette not loaded or unloaded No tape running, tape slack Supply/take-up main brake levers Tape slack NOTE : Part replacement. : Cleaning : Apply grease 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. Video head cleaning procedure 1. Apply one drop of cleaning liquid to the cleaning paper with the baby oiler. 2. Gently press the cleaning paper against the video head to fix your finger, and move the upper drum so that each head is passed to and fro 5 times (do not move the cleaning paper). 3. Wipe with the dry cleaning paper. Notes : • Use the commercially available ethanol of Class 1 as cleaning liquid. • Since the video head may be damaged, do not move up and down the cleaning paper. Rotate the upper drum with one hand. Gently press the cleaning paper to fix with your finger, and rotate the upper drum to clean. Move to and fro 5 times for each head. (Do not move the cleaning paper.) • Whenever the video head is cleaned, replace the cleaning paper. Parts Code Description Code • Do not apply this procedure for the parts other than the ZPAPRA56-001E Cleaning Paper AW video head. ZOiLR-02-24TE Babe Oiler (Spoit) AH 16

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16
DV-NC70U/C
DV-NC72U
8-2 MAINTENANCE CHECK ITEMS AND EXECUTION TIME
Perform the maintenance with the regular intervals as follows so as to maintain the quality of machine.
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.
Maintained
Parts
Remarks
500
hrs.
1000
hrs.
1500
hrs.
2000
hrs.
Possible symptom
encountered
Guide roller ass’y
Sup guide shaft
Reverse guide
Slant pole on 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
Color and beating
Small sound or sound
distortion
Poor S/N ratio, no color
Poor flatness of the
envelope with alignment
tape
No tape running,
uneven color
No tape running, tape
slack
No tape running, tape
slack, no fast forward/
rewind motion
Lateral noises Head
occasionally blocked
Abnormal rotation or significant
vibration 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 specified cleaning
liquid.
Screen swaying
Cassette not loaded or
unloaded
No tape running, tape
slack
Tape slack
Video head cleaning procedure
1.
Apply one drop of cleaning liquid to the cleaning paper with the baby oiler.
2.
Gently press the cleaning paper against the video head to fix your finger, and move the upper drum so that each head
is passed to and fro 5 times (do not move the cleaning paper).
3.
Wipe with the dry cleaning paper.
Notes :
•
Use the commercially available ethanol of Class 1 as
cleaning liquid.
•
Since the video head may be damaged, do not move up
and down the cleaning paper.
•
Whenever the video head is cleaned, replace the clean-
ing paper.
•
Do not apply this procedure for the parts other than the
video head.
Parts Code
Description
Code
ZPAPRA56-001E
Cleaning Paper
AW
ZOiLR-02-24TE
Babe Oiler (Spoit)
AH
Gently press the cleaning paper to
fix with your finger, and rotate the
upper drum to clean.
Move to and fro 5 times for each head.
(Do not move the cleaning paper.)
Rotate the upper drum
with one hand.