Mitsubishi Electric HS-U449, Service Manual

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Lightly apply the cloth
on the UPPER DRUM
ASSY. Do not move the
cloth.
Video Head
Cleaning
Cloth
!1
!2
w
u y
!0
e
r
q
t
i
o
Fig. 1-1
1. DECK Cleaning
The following parts require cleaning whenever serviced in
order to maintain satisfactory performance.
1-1. VIDEO HEAD
1. Clean the VIDEO HEAD according to the following
method. Dust and other foreign objects on the VIDEO
HEAD disturb the normal PLAYBACK picture. To
clean the VIDEO HEAD, hold a VIDEO HEAD cleaning
cloth dampened with alcohol against the DRUM and
slowly turn the DRUM counter-clockwise.
Note : Do not directly touch the HEADS attached to the
UPPER DRUM ASSY. The HEADS are very hard
but brittle to shock (especially to shock in the
vertical direction) and are easily broken.
Never apply force to it in the vertical direction.
2. Allow the residual alcohol to dry thoroughly before
running a tape. The residual alcohol on the HEADs
may damage the tape if not dried completely.
MECHANICAL ADJUSTMENT AND REPLACEMENT
1-2. Tape Running System
Clean the following parts of the Tape Running System.
1. TENSION PIN
2. F/E HEAD
3. SLANT POLE (SP)
4. SLANT POLE (TU)
5. A/C HEAD
6. GUIDE POLE (TU)
7. PINCH ROLLER
8. GUIDE PIN (TU)
9. GUIDE ROLLER (SP)
10. UPPER / LOWER DRUM ASSY
11. GUIDE ROLLER (TU)
12. CAPSTAN SHAFT
1. Clean the Tape Running System using a piece of
gauze dampened with alcohol except for the GUIDE
ROLLER (SP), GUIDE ROLLER (TU), and PINCH
ROLLER which require to be cleaned with a piece of
dry gauze.
2. Allow the residual alcohol to dry thoroughly before
running the tape. The residual alcohol on the
SYSTEM may damage the tape if not dried
completely.
1-3. REEL DISK Drive System
1. Clean the BRAKE side and the REEL BELT of the
REEL DISK Drive System.
2. Clean the REEL DISK Drive System using a piece of
gauze dampened with alcohol except for the REEL
BELT which requires cleaning with a piece of dry
gauze.
3. Allow the residual alcohol to dry thoroughly before
operation.
Fig. 1-2
UPPER DRUM ASSY cleaning