DOWNLOAD Sony HCD-XB33K / HCD-XB44K / LBT-XB33K / LBT-XB44K Service Manual ↓ Size: 9.04 MB | Pages: 80 in PDF or view online for FREE

— 21 —

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 1dB of peak.

3. Mode:  Playback (FWD)

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

pats adjusted.

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

and main board.

• Start the Tape Speed adjustment as below after setting to the test

mode.

• In the test mode, the tape speed is high during pressing the

H. SPEED DUB  button.

Procedure:
1. Turn the power switch on.
2. Press the GROOVE button, ENTER/NEXT button and

DISC 4 button simultaneously.

To exit from the test mode, press the POWER button.

Mode:  Playback (FWD)

Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301
(L-CH) and RV401 (R-CH) so that adjustment within adjustment
level as follows.
Adjustment Level:
CN207 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:  AUDIO and main boards

1. Insert the WS-48B into the deck A and the blank tape into the

deck B.

2. Press the REC button and · button on the deck B.  Then

the deck B is at recording mode.

3. Set the deck A to playback mode.
4. Keep pressing the H. SPEED DUB button in playback mode.

Then at HIGH speed mode.

5. Adjust RV652 on the AUDIO board do that frequency counter

reads 6,000 ± 180 Hz.

6. Take off the H. SPEED DUB button.

Then at NORMAL speed mode.

7. Adjust RV651 on the AUDIO  board so that frequency counter

reads 3,000 ± 90 Hz.

8. Frequency difference between deck  A and deck B the beginning

of the tape should be within ± 1.5%.

Adjustment Location:  AUDIO board

Screw
position

L-CH
peak

within
1dB

output
level

L-CH
peak

R-CH
peak

within
1dB

Screw
position

R-CH
peak

main
board
CN207
set

test tape
P-4-A100
(10kHz, –10dB)

pin 

3

oscilloscope

L-CH

R-CH

V

H

waveform of oscilloscope

in phase 45

°

90

°

135

°

180

°

good

wrong

pin 

2

pin 

1

L

R

reverse

forward

+
–

set

test tape
WS-48B 
(3 kHz, 0 dB)

main board
CN207 (Pin 

1

 : L-CH)

     (Pin 

3

 :R-CH)

frequency counter

+
–

set

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

main board
CN207 (Pin 

1

: L-CH)

(Pin 

3

: R-CH)

level meter

W.RMS (JIS) within 0.3%
(test tape: WS-48B)

Procedure:
Mode:  Playback (FWD)

— 22 —

Procedure:
1. Mode:  record

2. Mode:  Playback

Confirm playback that the signal recorded in step 1 becomes adjustable
limits as follows.
If these levels are not adjustable limits, adjust the RV341 (L-CH) and
RV441 (R-CH) on the AUDIO board to repeat steps 1 and 2.
Adjustable limits: Playback output of 315 Hz to playback output

of 10kHz:  0±0.5 dB

Adjustment Location: AUDIO and main boards

Procedure:
1. Mode:  record

2. Mode:  Playback

Confirm playback that the signal recorded in step 1 becomes
adjustable limits as follows.
If these levels are not adjustable limits, adjust the RV1501 (L-CH)
and RV1551 (R-CH) on the main board to repeat steps 1 and 2.

CN207 PB level:  47.3 to 53.1 mV (–24.3 to –23.3 dB)

Adjustment Location:  main board

[MAIN  BOARD] (Component Side)

[AUDIO  BOARD]  (Conductor Side)

attenuator

set

Pin 

6

 (L-CH) of IC1501 on the main board.

Pin 

#¶

 (L-CH) of IC1501 on the main board.

1) 315 Hz
2) 10 kHz

50 mV (–23.8 dB)







Pin 

2

 (GND) of ICN207 on the main board.

600 

Ω

blank tape
CN-123

AF OSC

+
–

set

recorded
portion

CN207 (Pin 

1

: L-CH)

(Pin 

3

: R-CH)

level meter

set

Pin 

6

  (L-CH) of IC1501 on the main board.

Pin 

#¶

  (R-CH) of IC1501 on the main board.

315 Hz, 50 mV (–23.8 dB)

blank tape
CS-123

Pin 

2

  (GND) of CN207 on the main board.

600 

Ω

attenuator

AF OSC

+
–

set

recorded
portion

CN207 (Pin 

1

: L-CH)

(Pin 

3

: R-CH)

level meter

RV1501

IC1501

CN205

CN207

RV1551

RECORD LEVEL

IC301

IC201

RECORD

BAIS

TAPE SPEED

(NORMAL)

RV651

®

(HIGH)

RV652

®

RV311

L 

®

RV411

R 

®

PB

LEVEL

RV441 RV341

RV301

®

L

RV401

®

R

R

L

– DECK B –

– DECK A –











PB LEVEL

    

































— 23 —

1. CD Block is basically designed to operate without adjustment.

Therefore, check each item in order given.

2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M

Ω

 impedance.

4. Clean the object lens by an applicator with neutral detergent when the

signal level is low than specified value with the following checks.

5. Adjust the focus bias adjustment when optical block is replaced.

Procedure:
1. Connect oscilloscope to test point TP (RF). (GND terminal :

VC)

2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that the shape “

≈

” can be clearly distinguished at the

center of the waveform and check the RF signal level.

Procedure:
1. Connect oscilloscope to test point TP (FEO).
2. Connect between test point TP (FOK) and GND by lead wire.
3. Turn Power switch on.
4.  Put disc (YEDS-18) in and turned Power switch on again and

actuate the focus search.  (actuate the focus search when disc
table is moving in and out.)

5. Check the oscilloscope waveform (S-curve) is symmetrical

between A and B.  And confirm peak to peak level within 3±1
Vp-p.

S-curve waveform

6. After check, remove the lead wire connected in step 2.

• Try to measure several times to make sure than the ratio of A : B

or B : A is more than 10 : 7.

• Take sweep time as long as possible and light up the brightness

to obtain best waveform.

+
–

BD board

TP (RF)

VC

oscilloscope

(DC range)

VOLT/DIV: 200 mV
TIME/DIV: 500 ns

level:
1.3 

±

 0.3Vp-p

+

–

BD board

TP (FEO)
TP (VC)

oscilloscope

A

B

symmetry

within 3 

±

 1 Vp-p

Procedure:
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal

level is correct or not.

  

Clear RF signal waveform means that the shape “

≈” can be

clearly distinguished at the center of the waveform.

+
–

BD board

TP (RF)
TP (VC)

oscilloscope

VOLT/DIV: 200 mV
TIME/DIV: 500 ns

level:
1.3 

±

 0.3Vp-p

— 24 —

Procedure:
1. Connect oscilloscope to test point TP (TEO) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the “P (Pause)” button.  (Becomes the 1 track jump mode)
5. Check the level B of the oscilloscope's waveform and the A

(DC voltage) of the center of the Traverse waveform.
Confirm the following:

A – B

2 (A + B)  

×

 100 = ±7 (%)

+
–

BD board

TP (TEO)
TP (VC)

oscilloscope

Center of the waveform

B

level : 500 mV 

±

 100 mVp-p

symmetry

A (DC voltage)

0V

IC103

CNU102

IC101

IC
I02

TP
(RF)

TP
(FOK)

TP
(VC)

TP (FEO)

TP (TEO)

TP
(GND)

CNU101

1 track jump waveform

[BD BOARD]  (Conductor Side)