HCD-N455K, LBT-N455K - Sony Audio Service Manual (repair manual). Page 10

— 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.

3. Mode : Playback (FWD)

test tape
P-4-A100
(10kHz, –10dB)

main board
CN403
Pin 

3

4. Repeat steps 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the

parts adjusted.

Adjustment Location : Record/Playback Head (Deck A and B)

L-CH
peak

screw
position

R-CH
peak

within
1dB

output
level

R-CH
peak

L-CH
peak

within 1dB

screw
position

FWD side

REV side

Adjustment screw

Start the tape speed adjustment as bellow after setting 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, MENU 1 button and TUNER/

BAND button simulateously.

Procedure :
Mode : Playback (FWD)

main board
CN403 (Pin 

3

 : L-CH)

(Pin 

1

 : R-CH)

frequency counter

test tape
WS-48B
(3kHz, 0dB)

level meter

set

test tape
P-4-L300
(315Hz, 0dB)

main board
CN403 (Pin 

3

 : L-CH)

(Pin 

1

 : R-CH)

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.

CN403 PB level : 301.5 to 338.3 mV (–8.2 to –7.2 dB)
level difference between the channels : within 

±

 0.5 dB

Adjustment Location : MD board

1. Insert tha WS-48B into the deck A to playback.
2. Press the HIGH SPEED DUBBING button. Then at HIGH

SPEED mode.

3. Adjust RV652 on the MD 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 RV651 on the MD 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%.

Adjustment Location : MD board

Mode : Playback (FWD)

Pin 

2

L

R

Pin 

1

oscilloscope

set

Waveform of oscilloscope

good

wrong

in phase

45

°

90

°

135

°

180

°

set