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Main Parts Location; Maintenance - JVC KD-A77 A Service Manual

Stereo cassette deck
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KD-A77 A/B/C/E/J/U
Main Parts Location
2
3
4
5
6
7
9
" - - - - - - - - 8
1 1
1 2
1 3
(Mechanical parts)
1.
Front panel assembly
1.
Switch holder
(U
2. DC solenoid for playback
2. Supply reel ass'y
3.
Reel motor
3.
Idler ass'y
4.
Geared and oil-damped brake ass'y
4.
Reel motor ass'y
5.
Variable resistor (INPUT LEVEL control)
5.
Take-up reel ass'y
6. Meter cover
6. Switch holder (R)
7.
LED P.W. Board ass'y
7.
Connecting wire (for play solenoid)
8.
Hall element P.W. Board ass'y
8.
Capstan
9.
Power switch
9.
Slide base ass'y
10. Power transformer
10. Stad with pad (for back tension)
11. Remote control socket (DIN socket)
11. Erase head
12.
Pin jacks ass'y
12.
Combined SA (SEN-ALLOY) record/play heads
13. Mecha. control P.W. Board ass'y
13. Pinch roller ass'y
Other mechanical parts are the same as location of model KD-A6:
Please refer to the service manual
0
KD-A6 A/B/C/E/J/U (No. 4179 -
page 4).
Maintenance
To get long, trouble-free service, maintenance is important.
Do not forget cleaning and demagnetizing.
Cleaning
After long, the heads and tape part - capstan, pinch roller,
etc. -
will become dirty with dust or magnetize particles.
Dirty heads cause imperfect erasing or high frequency
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 the EJECT button to open the cassette holder.
2)
Push up the transparent cover to remove it.
3)
Use the head cleaning stick 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
Close the cassette holder with its transparent cover remov-
ed. Press the tape detection pin inside the cassette com-
partment and set the deck in the playback mode. Insert the
cleaning stick into the hole on the right side at the bottom
of the cassette holder and clean the pinch roller and
oop"an.
~~:,"'h
" " , ,
~.~
Cleaning stick
No. 4186
- 4 -
3.
Cleaning the cabinet and panel
Wipe the cabinet and panel clean with a soft cloth dipped in
a neutral cleaner. Do not use thinner, benzine, alcohol or
other strong solvents, as these will cause damage to the
surface finish of the cabient and panel.
Demagnetizing
The heads are made from a material resistant to magnetiza-
tion, 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 inceased,
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 of 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 (1 2").
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.
Oiling
Feed one or two drops of machine oil to pinch roller shaft
once or twice a year under normal conditions of use.
Avoid oiling them excessively, or rotation may become ir-
regular because of oil splashes.

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