Read Sony HCD-N455KW / LBT-N455KRW Service Manual online
— 10 —
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw so
that outputs match within 1 dB of peak.
that outputs match within 1 dB of peak.
output
level
level
3. Mode: Playback
Tape Speed Adjustment (Deck A)
Note: Start the Tape Speed adjustment as below after setting the test
mode.
The tape speed can be changed with the HIGH SPEED
DUBBING button during the test mode.
The tape speed can be changed with the HIGH SPEED
DUBBING button during the test mode.
Method :
1. Turn the power switch on.
2. Press the DISPLAY/DEMO button, FILE 1 button and TUNER/
1. Turn the power switch on.
2. Press the DISPLAY/DEMO button, FILE 1 button and TUNER/
BAND button simultaneously.
To exit from the test mode, Press the SYSTEM POWER button.
Procedure :
Mode: Playback
Mode: Playback
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location: Playback Head (Deck A)
Record/Playback/Erase Head (Deck B)
45˚
90˚
135˚
180˚
wrong
good
in phase
R
set
FWD side
REV side
L-CH
peak
peak
screw
position
position
R-CH
peak
peak
within
1dB
1dB
within 1dB
L-CH
peak
peak
R-CH
peak
peak
screw
position
position
test tape
P-4-A100
(10kHz, –10dB)
P-4-A100
(10kHz, –10dB)
main board
CN403
Pin
CN403
Pin
3
(L-CH)
oscilloscope
Pin
2
(GND)
L
Pin
1
(R-CH)
Waveform of oscilloscope
Adjustment screw
+
–
–
main board
CN403 Pin
CN403 Pin
3
(L-CH)
Pin
1
(R-CH)
set
test tape WS-48B
(3kHz, 0dB)
(3kHz, 0dB)
frequency counter
1. Insert the WS-48B into the deck A to playback.
2. Press the HIGH SPEED DUBBING button. Then at HIGH
2. Press the HIGH SPEED DUBBING button. Then at HIGH
SPEED mode.
3. Adjust the RV652 on the AUDIO board so that the frequency
counter reading becomes 6,000 ± 30 Hz.
4. Press the HIGH SPEED DUBBING button again to be set the
NORMAL SPEED mode.
5. Set to the playback mode.
6. Adjust the RV651 on the AUDIO board so that the frequency
6. Adjust the RV651 on the AUDIO board so that the frequency
counter reading becomes 3,000 ± 15 Hz.
Frequency difference between deck A and deck B the beginning
of the tape should be within ± 1.5%.
of the tape should be within ± 1.5%.
Adjustment Location: AUDIO board
Playback Level Adjustment (Deck A, Deck B)
Procedure:
Mode: Playback
Mode: Playback
set
test tape P-4-L300
(315Hz, 0dB)
(315Hz, 0dB)
main board
CN403 Pin
CN403 Pin
3
(L-CH)
Pin
1
(R-CH)
level meter
Deck A is RV311 (L-CH) and RV411 (R-CH), deck B is RV301
(L-CH) and RV401 (R-CH)
so that adjustment within the following adjustment level.
(L-CH) and RV401 (R-CH)
so that adjustment within the following adjustment level.
Adjustment level:
CN403 playback level: 301.5 to 338.3 mV (–8.2 to –7.2 dB)
level difference between the channels: within ± 0.5 dB
Adjustment Location: AUDIO board
CN403 playback level: 301.5 to 338.3 mV (–8.2 to –7.2 dB)
level difference between the channels: within ± 0.5 dB
Adjustment Location: AUDIO board
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