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ROQ-J20X
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Fig. 4
Procedure
To remove ——
Remove ——
Shown in fig. ——
.
- Battery cover
1
+ 2 screws
1
+ 3 black screws
2
- As shown in fig. 1, push the claw in the
direction of arrow ©, then lift bottom case
assembly in the direction of arrow @).
Bottom case assembly
+ 2 screws
* 1 red screw
- First, press the stop/eject button, and
open the cassette compartment cover.
Main case assembly
Press the playback button, and push the
mechanical assembly up in the direction of
arrow @) while pulling portion @) in the
direction of arrow @), as shown in Fig. 3.
Then, the main case assembly can be
removed.
> 1 red screw
+ 2 screws
+ 2 black screws
- Unsolder the soldered portion of the
brush holder assembly
CHIP PARTS REPAIR PROCEDURE
(transistor, diode, resistor and capacitor, etc.)
Main circuit board and motor
governor circuit board
A. Removal
1. Remove all solder from both ends of chip using a solder sucker
(RP8062) or desoldering wick.
Tweezers
2. While the chip is hot remove it by turning with tweezers, as shown
in fig. 1.
* Make sure that the unit is turned OFF when checking the resistance
and polarity of a chip.
Soldering iron
Unsolder
B. Mounting
Place solder on the foil chip mounting, and solder the chip while applying
Soldering iron
the soldering iron in the direction of the arrow, as shown in the diagram
y
&
(point must
(fig. 2).
be clean)
Fig. 2
Solder
C. Precautions in mounting the chip
1. Do not heat the chip beyond 3 seconds.
2. Do not rub the electrode.
3. Use tweezers to prevent any damage to the surface.
4. It is recommended that a pencil-type soldering iron be used.
5. Maintain temperature control under 260°C (500°F) when soldering.
* Chip resistance (of not more than 100Q) may vary greatly with the direction of mounting; therefore, mount the white side
on the pattern side.
6. Do not re-use the tantalum capacitors or ceramic capacitors after removal (use new components).
7. Do not subject the components (chips) to excessive stress.
ok, 3
—
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