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RN-109
RN-109
DISASSEMBLY INSTRUCTIONS
Notes:
1. Because
this 'unit is very small, and therefore the
screws are also especially small, be careful not to
lose any parts during disassembly.
2. Be very careful, when
replacing parts or checking,
not to damage the lead wiring, because
it is much
thiner than lead wiring used in other sets.
A. How to remove the cassette lid assembly (M84).
e
As shown in fig. 3, push the claw in the direction
of arrow) , then pull cassette lid assembly in the
direction of arrow @.
Then, it can be removed.
B. How to remove main case assembly (K1).
1. Remove two screws-A (1.64). (Fig. 3)
2. As shown in fig. 3, push the main case assembly
in the direction of arrow @ while pulling portion
(B) in the direction of arrow® .
Then, the main case assembly can be removed.
C. How to remove the bottom case (K2).
1. Remove
two screws-C
(2x1.6) and one screw-D
(1.6x4). (Fig. 4)
2. Desolder the point (E) joining the battery terminal
and the FPC board.
The bottom case assembly can be, then, removed
as shown in fig. 6.
NOTE:
Be careful not to lose the shelter (K19) since it is
easy to come off as shown in fig. 7.
D. How to remove FPC board
e
Remove one screw-F (1.6x2.2), one screw-G (1.6x3)
and one screw-H (1.6x1.5). (Fig. 7)
@:-
preaeren
(A)
removing the
cap (K16).
Fig. 5
Bottom Case
Assembly
"Shelter (K19)
i Epc
(F) (G) (H)
eg
SF
|
1
>
REPLACING THE MAIN PARTS OF THE MECHANISM UNIT
A. How to replace the motor assembly
1. Remove
two
screws
(A) to remove
the
motor
assembly. (See fig. 8.)
2. Mount the motor assembly so that its lead wires
direct as shown in fig. 8.
Flywheel Assembly
Flywheel Belt
Wires
B. How to replace record/playback head
1. Remove the pinch roller spring as shown in fig. 9.
2. Remove the poly washer (B) to remove the pinch
roller arm assembly. (See fig. 9.)
3. Remove
two
screws
(C) to remove
the record/
playback head. (See fig. 9.)
4. When
the
record/playback
head
is_ installed,
reverse the disassembly procedure above.
5. Readjust the head, referring to measurement and
adjustment in this service manual.
Motor Assembly
Record/Playback Head
Printed Circuit
Board
Switch
Lever
(M36)
Mechanism
Unit
Assembly notes:
eWhen installing the printed circuit board on the mechanism
unit, note the following:
Check that the reocrd/playback (S1), play (S5) and fast forward/rewind (S4) switches are placed in their
specified positions as shown in fig. 10.
MEASUREMENT AND ADJUSTMENT METHODS
NOTES:
Keep good condition, set switch buttons and controls in the following positions, unless otherwise
specified.
e Make sure heads are clean.
e Make sure capstan and pinch roller are clean.
e Judgeable room temperature: 20+5°C (68+9° F)
e Volume control: Maximum
e Tape speed select switch: 2.4cm/s
e FF/REW switch: OFF
ITEM
MEASUREMENT
& ADJUSTMENT
Adjusting the
Note:
governor circuit
This unit is designed to supply the motor and motor governor circuit board to-
(u adjustment)
gether, thus requiring no governor circuit adjustment when the motor is replaced.
However, the R103 adjusting resistor in the motor governor circuit uses 10k to
20k depending on the product.
When replacing the resistance of R103, be sure to use a resistance of the same
value.
e VAS/Pause switch: OFF
. Test equipment connection is shown in fig. 11.
. Apply 3V to DC IN.
. Connect the monitor output (8) to the counter.
. Playback the tape speed
adjusting
tape (for
:
eds,
QZZMWA,
for
1.2cm/s
oc power supply miayoackemons Digital electronic counter
. Measure this frequency.
Fig. 11
®
Tape speed
adjustment
Condition:
* Playback mode
Equipment:
* DC power supply
* Digital electronic
counter
* Test tape
..-QZZMWA for
2.4cm/s
.--QZZMWBL for
1.2cm/s
Standard value: 3000:90Hz (2.4cm/s), 3000 * 2° Hz (1.2cm/s)
6. If measured value is not within standard, adjust as follows.
A) 1.2cm/s adjustment
1. Set the tape speed selector switch (S2) to 1.2cm/s.
2. Adjust tape speed adjustment VR101 (for 1.2cm/s adjustment) so that fre-
;
+ 90
quency is 3000 * 150 Hz.
B) 2.4cm/s adjustment
1. Set the tape speed selector switch (S2) to 2.4cm/s.
2. Measure
in the same
way as 1.2cm/s and adjust tape speed adjustment
VR102 (for 2.4cm/s adjustment) so that frequency is 3000+90 Hz.
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