– 19 –
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 –
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
47k
Ω
47k
Ω
5-2. 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.
set
LINE OUT
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
FWD side REV side
adjustment screw
