11
11
WM-GX780/GX788
SECTION 4
MECHANICAL ADJUSTMENT
SECTION 5
ELECTRICAL ADJUSTMENT
PRECAUTION
1.
Specified voltage
: 1.3 V (DC)
2.
Switch and control position
MENU switch
HOLD
: OFF
VOL
: MAX
ISS
: 1
TAPE SECTION
Tape Speed Adjustment
Procedure:
1.
Enter the FWD playback mode.
2.
Confirm RV602 at center value. (mechanical center)
3.
Adjust RV601 so that the value of the frequency counter reading
becomes 3,000 Hz.
Specification value:
Frequency counter
2,955 Hz – 3,045 Hz
4.
Check that the frequency deviation at the beginning and ending
of a tape is within 1.5 % (45 Hz).
5.
Select switch to 2X (2.4 cm/s), then depress play button in and
adjust RV603 (2,955 Hz–3,045 Hz) at tape center.
PRECAUTION
1.
Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback/erase head
pinch roller
rubber belts
capstan
2.
Demagnetize the record/playback/erase head with a head
demagnetizer. (Do not bring a head demagnetizer close to the
erase head.)
3.
The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
• Torque Measurement
Signal
3 kHz, 0 dB
3 kHz, 0 dB
Used for
Tape Speed Adjustment
Tape Speed Adjustment
Tape
WS-48A (4.8cm/s)
WS-24CC (2.4cm/s)
Test tape
WS-48A/24CC
(3kHz, 0dB)
Set
i
REMOTE jack (J301)
16
Ω
Frequency counter
+
–
[MAIN BOARD] — SIDE B —
Adjustment Parts Location :
[MAIN BOARD] — SIDE A —
Mode
FWD
FWD
Back Tension
REV
REV
Back Tension
FF, REW
Torque Meter
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
Meter Reading
1.47 to 2.45 mN•m
(15 to 25 g•cm)
(0.21 to 0.34 oz•inch)
Less than 0.20 mN•m
(Less than 2.0g•cm)
(Less than 0.028 oz•inch)
1.47 to 2.45 mN•m
(15 to 25 g•cm)
(0.21 to 0.34 oz•inch)
Less than 0.20 mN•m
(Less than 2.0g•cm)
(Less than 0.028 oz•inch)
More than 4.90 mN•m
(More than 50 g•cm)
(More than 0.69 oz•inch)
CT1
L1
L5
L5 : AM frequency coverage
adjustment
CT1 : AM frequency coverage
adjustment
L1 : FM frequency coverage
adjustment
J501
J301
RV603
RV601
WS-48A (4.8 cm/s)
adjustment
WS-24CC (24 cm/s)
adjustment
[AM]
BAND switch : AM
[FM]
BAND : FM
• Repeat the procedures in each adjustment several times.
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
620 kHz (US)
621 kHz (Except US)
CT1
1400 kHz (US)
1395 kHz (Except US)
TUNER SECTION
0.01
µ
F
FM RF signal
generator
to ANT
22.5kHz frequency deviation by 400Hz signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
AM RF signal
generator
16
Ω
set
+
–
level meter
i
REMOTE jack (J301)
0dB=1µV
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
76 MHz
Confirmation
108 MHz
