JVC DD-9 A - Main Parts Location and Maintenance; Cleaning Procedures; Demagnetizing Heads

Main Parts Location
Maintenance
To get long, trouble-free service, maintenance is important.
Do not forget cleaning and demagnetizing.
Cleaning
After long use, the heads and tape part — capstan, pinch
roller, etc. — will become dirty with dust or magnetic
particles. Dirty heads cause imperfect erasing or high fre-
quency drop-off. A dirty capstan and pinch roller will cause
unstable tape speed, leading to increased wow and flutter.
Always keep them clean by following the procedure below.
1. Heads
1) Push Eject button to open the cassette holder.
2) Use the head cleaning stick provided to wipe the surface
where the tape comes into contact with the head.
(It is effective to moisten the cotton with alcohol.)
2. Pinch roller and capstan
Do the samemethod as heads.
3. Cabinet
When the cabinet becomes dirty, wipe it with a soft cloth
soaked with a neutral cleaning solution of a polishing cloth.
* Do not use thinner or benzine.
| DD-9A/B/C/E/J/U
Power switch
Pin jack ass‘y
Computer P.W.B. ass’y
Power supply P.W.B. ass’y
Power transformer
Front plate ass’y
F.L. P.W.B. ass’y
Gear-oiled damper
Mechanical assembly
Mecha. control P.W.B. ass’y
Auto stop pulley
POSEN OAPWN > _— —
Mechanical parts are the same as location of model DD-7,
Please refer to the service manual of DD-7A/B/C/E/J/U
(No. 4195 — page 3).
Demagnetizing
The heads are made from a material resistant to magneti-
zation, but after long use they may become magnetized.
A magnet brought into their vicinity can magnetize the
heads, causing excess noise. If noise seems to have increased,
demagnetize the heads with a head demagnetizer through
the following procedure.
1. Turn the POWER switch OFF.
2. Wrap the tip of the demagnetizer with vinyl tape or soft
cloth so as not to damage the head surface. Switch on
the demagnetizer and bring it close to the head.
3. Move the tip of the demagnetizer slowly first to the left
and right, then up and down in front of the head.
Gradually move it away from the head and switch it off
at a distance of more than 30 cm (12”).
4. The erase head need not be demagnetized. The capstan
shaft and tape guide should be demagnetized in the same
way as the record/playback head.
Do not bring a magnetized metallic object (a screwdriver,
for example) near the head as this will increase noise.
No. 4198
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