DOWNLOAD Sharp DV-NC70H (serv.man9) Service Manual ↓ Size: 14.28 MB | Pages: 113 in PDF or view online for FREE

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.

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

AHC (Automatic head cleaner)

Colour and beating 

Small sound or sound 
distortion

Poor S/N ratio, no colour
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.

Replace the roller of the cleaner 
when it wears down.
Just change the AHC roller 
assembly for new one.

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.

1

Full erase head

2

Supply pole base ass’y

3

Tension arm ass'y

4

Idler wheel ass’y

5

Open guide

6

Supply reel disk

7

Supply main brake

8

Take-up main brake ass'y

9

Pinch drive cam

10

A/C head ass’y

11

Reverse guide lever ass’y

12

Reel relay gear

13

Take-up reel disk

14

Pinch roller lever ass’y

15

Drum ass'y

16

Loading motor

17

Drum motor

18

Take-up pole base ass'y

26

Auto head cleaner Ass'y

17

15

26

11

5

9

14

12

8

16

13

4

6

2

7

3

1

18

10

19

Syncro Gear

20

Master cam

21

Capstan D.D. motor

22

Reel belt

23

Clutch lever

24

Limitter pulley ass’y

25

Shifter

25

24

21

22

19

20

23

INSTALLING THE CASSETTE HOUSING
When the cassette housing is installed on the mechanism,
the initial setting is essential condition.
There are two initial setting methods, namely electrical and
mechanical.

1. Electrical initial setting
So as to perform initial setting of mechanism execute the Step
1 of Installation of cassette housing. After ascertaining the
return to the initial setting position install the cassette housing.
(Conditions: When mechanism and Main PWB have been
installed)

1. When removing the mechanism from the set.

Remove the two screws 1 which connecting mechanism
and main frame.
Take out vertically the mechanism with attention to its
edges, so that it does not damage the adjacent parts.

2. Removing the mechanism and cassette housing.

Remove the two screws 2 fixing the cassette housing
to the mechanism, and remove the cassette housing.

Pinch

 Drive Cam

Synchro Gear

Master cam

Main Chassis

Drive Lever

The engaging groove on 
the drive lever must be 
located as shown in the figure.

The hole of the pinch drive cam 
must be directed toward 
the synchro gear shaft.

Cassette Control
Housing

Mechanism
Chassis

Main PWB

2

1