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TAPE DECK ADJUSTMENTS
1. HEAD REPLACEMENT
• After replacement, demagnetize the heads by using a degausser.
• Be sure to clean the heads before attempting to make any adjustments.
• All wiring should be returned to the original position after work is completed.
2. HEAD AZIMUTH ADJUSTMENT
(1) Load the test tape(VTT-703, etc., 10 kHz) for azimuth
adjustment.
(2) Press the PLAY button.
(3) Use a cross-tip screwdriver to turn the screw for azimuth
adjustment so that the left and right output are maximized.
(4) Press the STOP button.
(5) After completion of the adjustment, use thread lock(TB-1401B)
to secure the azimuth-adjustment screw.
3. AC BIAS FREQUENCY ADJUSTMENT
(1) Connect counter to T201(BS).
(2) R/P switch in recording state.
(3) Adjustment T801 a plastic screw , AC bias frequency : 80 kHz.
4. MOTOR SPEED ADJUSTMENT
(1) Insert the test tape(TCC-119, etc., 3,000 Hz).
(2) Press the PLAY button.
(3) Use a flat-tip screwdriver to turn the SVR(located inside the
rear of the motor) to adjust SVR so that the frequency counter
become 3,000 Hz.
5. CHECKING THE MECHANISM TORQUES AND TENSION
• Clean the head, capstan and pinch roller before making any measurement.
Measurement
Cassette for
measurement
PLAY
F.FWD
REW
This is a basic adjustment.
IC BLOCK DIAGRAM & DESCRIPTION
IC903 LA6541D(CD Driver)
Vcc
Vref
VIN4
VG4
Vo8
24
23
22
21
11k
Level
Sift
Level
Sift
11k
1
2
3
4
Vcc
Mute
VIN1
VG1
Vo1
Take-up torque
PLAY : TW-211A
F.FW/REW : TW-2231
30 - 60 gr.cm
55 - 120 gr.cm.
55 - 120 gr.cm.
Vo7
GND
20
19
Vcc
BTL
Driver
BTL
Driver
5
6
Vo2
GND
Back tension
PLAY : TW-2111A
2.0 - 4.5 gr.cm
-----
-----
Vo6
Vo5
VG3
VIN3
CD
18
17
16
15
14
11k
BTL
Level
RESET
Driver
Sift
BTL
Level
Regulator
Driver
Sift
11k
7
8
9
10
11
Vo3
Vo4
VG2
VIN2 Reg OUT Reg IN
- 3 -
Tape tension
Drive-power cassete
TW-2412
60 gr or more.
-----
-----
RES
13
12
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