– 16 –
SECTION 4
ADJUSTMENTS
4-1. MECHANICAL ADJUSTMENTS
TAPE RECORDER SECTION
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 demag-
netizer.
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 sup-
ply voltage unless otherwise noted.
Torque Measurement
Torque
Torque Meter
Meter Reading
Forward
CQ-102C
36 to 61 g • cm
(0.5 to 0.84 oz • inch)
Forward
CQ-102C
2 to 6 g • cm
Back Tension
(0.028 to 0.083 oz • inch)
Reverse
CQ-102RC
36 to 61 g • cm
(0.5 to 0.84 oz • inch)
Reverse
CQ-102RC
2 to 6 g • cm
Back Tension
(0.028 to 0.083 oz • inch)
FF/REW
CQ-201B
61 to 143 g • cm
(0.85 to 1.98 oz • inch)
Tape Tension Measurement
Mode
Tension Meter
Meter Reading
FWD
CQ-403A
more than 100g
(more than 3.53 oz)
REV
CQ-403A
more than 100g
(more than 3.53 oz)
4-2. ELECTRICAL ADJUSTMENTS
TAPE RECORDER SECTION
0dB = 0.775V
1. The adjustnemts should be performed in the order in the service
manual. (As a general rule playback circuit adjustment should
be completed beforeming recording circuit adjustment.)
2. The adjustments should be performed for bothe L-CH and R-
CH unless otherwise indicated.
Standard Intput Level
Input terminal
LINE IN
source impedance
10k
Ω
input signal level
0.5V (–3.8dB)
Standard Output Level
Output terminal
LINE OUT
load impedance
47k
Ω
output signal level
0.5V (–3.8dB)
Test Tape
Type
Signal
Used for
P-4-A100
10kHz, –10dB
Azimuth Adjustment
WS-48B
3kHz,
0dB
Tape Speed Adjustment
Record/Playback/Erase Head Azimuth Adjustment
Procedure :
1. Mode : FWD playback
2. Turn the adjustment screw for the maximum output levels. If
these levels do not match, turn the adjustment screw until both
of output levels match together within 1dB.
3. Phase Check
Mode : FWD playback
4. Change the reverse playback mode and repeat the step 1 to 3.
5. After the adjustment, lock the adjustment screw with suitable
locking compound.
Adjustment Location : – record/playback/erase head –
set
LINE OUT (JK301)
47K
Ω
level meter
test tape
P-4-A100
(10kHz, –10dB)
L-CH
peak
R-CH
peak
L-CH
peak
R-CH
peak
Screw
position
output
level
within
1 dB
within
1 dB
screw position
V
H
in phase
90
°
45
°
135
°
180
°
good
wrong
set
L-CH
R-CH
screen pattern
test tape
P-4-A100
(10kHz, –10dB)
Osilloscope
LINE OUT (JK301)
47K
Ω
47K
Ω
adjustment screw
FWD side
REV side
