This section is extracted
from instruction manual.
7
8
• ILLUST LATION:WM-GX512 MODEL
9
— 3 —
SECTION 2
SERVICE NOTE
[Service Mode]
Mode which enables the mechanism to be operated with the
MAIN board opened.
Photo sensor PH701 mounted on the MAIN board is used to
detect rotaion of the reels. Because it is mounted on the MAIN
board, when the MAIN board is being removed, rotation of the
reels cannot be detected and the auto-off/tape-end detector
circuit does not operate correctly.
F/R switch (S701) is also mounted on the MAIN board.
Therefore, without the MAIN board, the head cannnot be
placed in playback position, and power cannot be supplied to
the circuitry of the playback system.
When the MAIN board is being removed, follow the
procedures below, in order to check operation of the
mechanisms of the tape deck and to check voltages supplied to
each circuit.
1. Setting
1) Refer to “Disassembly” and remove the cabinet and open
the MAIN board.
2) Connect the MAIN board to the motor and plunger using a
jumper wire. Use “Extension tool (1-769-143-11)) (one set
10 tools)” to make connection simple.
3) Short-circuit the service mode land (4 points) by soldering.
4) Apply a square wave signal to TP20. (See the figure on the
right.)
5) Supply 1.5V to the battery terminals (+) and (–) using a
DC power supply.
[MAIN Board]
— Side A —
AF OSCILLATOR
Connect to
plunger
S713
(ENTER)
S712
(TUNING –)
S704
S711
(TUNING +)
S707
(RADIO ON
BAND)
— Side B —
(REPEAT œ)
Battery Terminal (–)
S703
(RADIO OFF p)
SQUARE WAVE (SINE WAVE)
10Hz
3.5 dB (1.5V)
Service mode land
S709
(SET)
Service
mode land
S710
(MENU)
(AMS REW
PRESET –)
S705
(AMS FF
PRESET +)
S706
TP20
Battery
Terminal (+)
Connect to
motor
2. Preset State
This state must be set to set the PLAY, FF, and REW
modes.
1) Check that the lever (NR SW) is at the center and F/R
switch (S701) is at the center. If not, set the preset state as
follows.
2) Move the F/R switch (S701) according to the side faced by
the lever (NR SW).
3) Turn OFF the DC power supply switch once and then turn
it ON again so that the lever (NR SW) can be moved.
Move the F/R switch (S701) according to this timing and
set to the center.
3. FF REW Mode
1) Set the preset state and press the FF switch and REW
switch.
4. PLAY Mode
1) Set the preset state.
2) Press the œ switch. The lever (NR SW) will move to the
F side once and then to the R side. Move the F/R switch
(S701) according to this timing to set the PLAY (R side)
mode. Press the œ switch another time and move the F/
R switch (S701) according to the movement of the lever
(NR SW) to set the PLAY (F side) mode.
Note 1 : If the above cannot be performed, start again from
preset.
Note 2 : Use the remote control œ , p , FF, and REW
switches as much as possible. If the remote control is
not available, do not touch S703 to S706 with the
hand and use something with a round tip to press
them.
F side
[Lever (FR SW)]
PH701
S701 F/R SWITCH
(FWD N STOP n REV)
R side
Center
R side
Lever (NR SW)
Center
F side
S702
(HOLDER
SWITCH)
S714
(C HOLD)
C
HOLD
— 4 —
[Rotation system]
Rotation system during PLAY.
Reel table
(T side)
Gear (A)
Gear (K)
Capstan wheel (N)
assembly
Clutch assembly
Gear (B)
Gear (C)
Gear (NR)
(REV : Left side/
FWD : Right side)
Capstan wheel (R)
assembly
Reel table
(S side)
Motor pully
Pulley
(REVERSE)
Rotation system during REW.
Gear (B)
Reel table
(T side)
Gear (K)
Capstan wheel (N)
assembly
Gear (NR)
(REW : Left side)
Gear (NR)
Gear (A)
Capstan wheel (R)
assembly
Motor pully
Clutch assembly
Pulley
(REVERSE)
Rotation system during FF.
Gear (FR)
Clutch assembly
Gear (K)
Capstan wheel (N)
assembly
(FF : Right side)
Gear (NR)
Reel table
(S side)
Gear (C)
Capstan wheel (R)
assembly
Motor pully
Pulley
(REVERSE)
— 5 —
SECTION 3
DISASSEMBLY
Note :Follow the disassembly procedure in the numerical order given.
3-1. BRACKET ASSEMBLY AND CASSETTE HOLDER ASSEMBLY
1
Screw (M1.4x1.1)
2
Bracket assembly
4
Lock lever (B)
3
Screw (M1.4x1.1)
3-2.TUNER BOARD
3
Tuner board
5
Screw (M1.4x1.1)
1
Three screws (1.7x2.5)
(tapping)
2
TU cover
6
Cassette holder assembly
Note for installation
— 6 —
3-3. MAIN BOARD AND SUB BOARD
2
Remove the solder of the
plunger solenoid.
8
Remove the Main board
direction of arrow.
1
Flexible board
(Head)
7
Screw (M1.4x2.0)
S701
3
Remove the solder of the
ATS flexible board.
6
Tapping screw
ATS flexible board
4
5
Battery terminal
Remove the solder of the
motor.
Lever (NR switch)
Note : Confirm if the switch lever
installs it self in the groove
of a lever (NR switch) for
assembling.
— 7 —
SECTION 4
SECTION 5
MECHANICAL ADJUSTMENT
PRECAUTION
1. Before adjusting, clean the following parts with a piece of
cotton moistened with alcohol.
REC/PB headpinch roller
rubber beltcapstan
2. Demagnetize the playback head using a head
demagnetizer.
3. Do not use a magnetized screwdriver for adjustments.
4. After adjusting, apply screw-locking compound onto the
adjusted parts.
5. Unless specified otherwise, use a specified voltage (1.3V)
to perform the adjustments.
[Torque Measurement]
Mode
FWD
FWD
Back tension
REV
REV
Back tension
FF
REW
Torque MeterMeter Reading
18 — 33 g • cm
CQ-102C
0.5 — 3.0 g • cm
18 — 33 g • cm
CQ-102RC
0.5 — 3 g • cm
CQ-201B
More than 40 g • cm
ELECTRICAL ADJUSTMENT
PRECAUTION
1. Specified voltage : 1.3V.
2. Switch position
DOLBY NR switch : OFF
MEGA BASS switch: NORM
AVLS: OFF
CASSETTE SECTION
Test tape
Type
[Tape Speed Adjustment]
Procedure :
Test tape
WS-48A
(3kHz, 0dB)
1. Playback WS-48A (tape center part) in the FWD state and
adjust RV601 so that the frequency counter reading
becomes 3000 ± 10 Hz.
2. Playback WS-48A (tape center) in the REV state.
Check that the frequency counter reading is within 2.5%
of the reading of step 1.
SignalUsed for
16
Tape Speed AdjustmentWS-48A
frequency
counter
3 kHz, 0 dB
set
PHONES jack
Adjustment Point :
[MAIN BOARD] — Side A —
S714
(HOLD)
IC601
RV601
— 8 —
TUNER SECTION
[AM]
BAND switch : AM
NOTE: The adjustment should be performed setting the area indication
to “Eur”. (Refer to “Receiving Stations Outside Your Country”
on page 3.)
After the adjustment, reset the area indication as it was.
AM RF SSG
30% amplitude modulation by
400Hz signal
output level : as low as possible
Put the lead-wire
antenna close to
the set.
[FM]
BAND switch : FM
FM RF SSG
0.01µF
22.5kHz frequency deviation
by 400Hz signal.
output level : as low as possible
32
set
PHONES
to ANT (TP1)
VTVM
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM VT VOLTAGE ADJSTMENT
BAND switch : AM
TP22
(VT)
AM VT VOLTAGE ADJUSTMENT
Adjust for following values on digital voltmeter.
Display indication
Digital voltmeter reading1.5V
Adjustment part
digital
voltmeter
+
–
AM531 kHz
T1
[FM VCO Adjustment]
Procedure :
Carrier frequency : 98MHz
Modulation: no modulation
output level: 0.1V (100dB)
FM RF SSG
0.01µF
to ANT (TP1)
1. Connect frequency counter to the positions shown below.
2. Tune the to 98 MHz.
3. Adjust RV1 for 19 kHz ± 100Hz reading on the frequency
counter.
frequency
counter
TP23
(IC2 Pin !™)
1µF
100k
AM IF ADJUSTMENT
Adjust for a maximum reading on VTVM.
T2450 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on VTVM.
L5
CT1
FM IF ADJUSTMENT
Adjust for a maximum reading on VTVM.
L310.7 MHz
621 kHz
1,395 kHz
— 9 —
(IC2 Pin 9)
•Adjustment Parts Location
[TUNER BOARD] — Component side —
T2 : AM IF
T1 : AM VT
TP23
TP22
RV1 : VCO
L3 : FM IF
TP1
CT1 : AM TRACKING
L5 :
AM
TRACKING
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