6
TCM-450DV
SECTION 3
MECHANICAL ADJUSTMENTS
Tape Tension Measurement
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback head
pinch roller
erase head
rubber belt
capstan
2. Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head demagnetizer close to
the erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to
the parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage (2.5 V) unless otherwise noted.
Mode
Torque Meter
Meter Reading
1.97 – 3.92mN•m
FWD
(20 – 40 g•cm)
CQ-102C
(0.28 – 0.55 oz•inch)
0.05 – 0.49 mN•m
Forward Back
(0.5– 5 g•cm)
Tension
(0.007 – 0.069 oz•inch)
FF, REW
CQ-201B
more than 4.91 mN•m
(more than 50 g•cm)
(more than 0.69 oz•inch)
Mode
Tension Meter
Meter Reading
FWD
CQ-403A
more than 50 g
(more than 1.76 oz)
Torque Measurement
SECTION 4
ELECTRICAL ADJUSTMENTS
Tape Speed Adjustment
Mode: playback
Setting:
• Supplied voltage: 2.5 V
• Switch and control position
VOL contorl (RV101)
: mechanical center
PAUSE switch (S301)
: OFF
SPEED CONTROL (RV201)
: center click
VOR switch (S501)
: OFF
Test Tape
0 dB=0.775 V
Type
Signal
Used for
WS-48A
3 kHz, 0 dB
tape speed adjustment
frequency
counter
test tape
WS-48A
(3 kHz, 0 dB)
16
Ω
EAR jack (J102)
set
+
–
RV602
Tape Speed Adjustment
(Double Speed)
RV601
Tape Speed Adjustment
(Normal Speed)
Procedure:
1. Set
[REC TIME / PLAY MODE]
switch (S601) to NORMAL
(4.8 cm/s) position, and playback the tape (WS-48A) .
2. Adjust RV601 so that frequency counter reading becomes
3,000 Hz.
Specification values: 2,985 to 3,015 Hz
3. Set
[REC TIME / PLAY MODE]
switch (S601) to DOUBLE
(2.4 cm/s) position.
4. Playback the tape from the beginning for two minutes, then
adjust RV602 so that frequency counter reading becomes 1,500
Hz.
Specification values: 1,493 to 1,507 Hz
Confirm that deflection of the frequency counter reading between
the beginning and the end of tape is within 2% (NORMAL: approx.
60 Hz, DOUBLE: approx. 30 Hz) .
Adjustment Location:
– MAIN BOARD (Side B) –
