DOWNLOAD Sony HCD-XG55 Service Manual ↓ Size: 7.96 MB | Pages: 80 in PDF or view online for FREE

21

Mode: Playback

1. Insert the WS-48B into the deck B.
2. Press the H button on the deck B.
3. Press the 

[H SPEED DUB]

 button in playback mode.

Then at HIGH speed mode.

4. Adjust RV1001 on the LEAF SW board do that frequency

counter reads 6,000 

±

 180 Hz.

5. Press the 

[H SPEED DUB]

 button.

Then back to NORMAL speed mode.

6. Adjust RV1002 on the LEAF SW board so that frequency

counter reads 3,000 

±

 90 Hz.

Adjustment Location: LEAF SW board
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)

(WS-48B)

Procedure:
Mode: Playback

Deck A is RV311 (L-CH), Deck B is RV301 (L-CH) so that ad-
justment within specification values as follows.

J101 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 board

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

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

pats adjusted.

°

°

°

°

 Perform this adjustments for both decks

Procedure:
1. Mode: Playback (FWD)

Adjustment Location: Playback Head (Deck A).

Record/Playback/Erase Head (Deck B).

22

Procedure:
1. Mode: Record

FUNCTION: VIDEO

2. Mode: Playback

3. Confirm playback the signal recorded in step 1 become speci-

fication values as follows.
If these values are out of specification values, adjust the RV341
(L-CH) and RV441 (R-CH) on the AUDIO board to repeat
steps 1and 2.

Specification values: Playback output of 315 Hz to playback

output of 10 kHz: 

±

 0.5 dB

Adjustment Location: AUDIO board

Procedure:
1. Mode: Record

FUNCTION: VIDEO

2. Mode: Playback

3. Confirm playback the signal recorded in step 1 become speci-

fication values as follows.
If these values are out of specification values, adjust the RV301
(L-CH) and RV351 (R-CH) on the MAIN board to repeat steps
1 and 2.

Specification values:
J101 PB level:  47.2 to 53.0 mV (– 24.3 to – 23.3 dB)

Adjustment Location: MAIN board







Ω

Ω





 





























































23

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

fore, 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 10 M

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.

Procedure:
1. Connect oscilloscope to TP (FE) and TP (VC).
2. Connect between TP (FE1) and TP (VC) by lead wire.
3. Connect between TP (AGCCON) and TP  (GND)  by lead wire.
4. Turn the power ON.
5. Load a disc (YEDS-18) and actuate the focus search. (In con-

sequence of open and close the disc tray, actuate the focus
search)

6. Cofirm that the oscilloscope waveform (S-curve) is symmetri-

cal between A and B.  And confirm peak to peak level within
4 

±

 1 Vp-p.

S-curve waveform

7. After check, remove the lead wire connected in step 2 and 3.

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

or B : A is more than 10 : 7.

• T ake sweep time as long as possible and light up the brightness

to obtain best waveform.

Procedure:
1. Connect oscilloscope to TP (RF) and TP (VC).
2. Connect between TP (AGCCON) and TP (GND) by lead wire.
3. Turn the power ON.
4. Load a disc (YEDS-18) and press the

H

 

X

button to play.

5. Confirm that the oscilloscope waveform is clear and check RF

signal level is correct or not.

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

Clear RF signal waveform means that the shape “ ” can be clearly
distinguished at the center of the waveform.

±

±

Procedure :
1. Connect oscilloscpe to TP (TE) and TP (VC).
2. Turn the power ON.
3. Load a disc (YEDS-18) and playback the number five track.
4. Press the

H

 

X

button. (Becomes the 1 track jump mode)

5. Confirm that the level B and A (DC voltage) on the oscillo-

scope waveform.

1 track jump waveform

Specified level:          

×

 100 = less than 

±

 22%

6. After check, remove the lead wire connected in step 1.

A
B

±

24

Note on Printed Wiring Board:
•

X

: parts extracted from the component side.

•

Y

: parts extracted from the conductor side.

•

: Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

• Indication of transistor.

Caution:
Pattern face side:

Parts on the pattern face side seen from

(Side B)

the pattern face are indicated.

Parts face side:

Parts on the parts face side seen from

(Side A)

the parts face are indicated.

B

These are omitted.

C

E

Q

B

These are omitted.

C

E

Q

C

B

These are omitted.

E

Q

Note on Schematic Diagram:
• All capacitors are in 

µ

F unless otherwise noted. pF: 

µµ

F

50 WV or less are not indicated except for electrolytics
and tantalums.

• All resistors are in 

Ω

 and 

1

/

4

 

W or less unless otherwise

specified.

•

2

: nonflammable resistor.

•

5

: fusible resistor.

•

C

: panel designation.

•

f

: internal component.

•

A

: B+ Line.

•

B

: B– Line.

•

H

: adjustment for repair.

• Voltages are taken with a VOM (Input impedance 10 M

Ω

).

Voltage variations may be noted due to normal produc-
tion tolerances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal produc-
tion tolerances.

• Circled numbers refer to waveforms.

• Signal path.

F

: TUNER (FM/AM)

E

: TAPE PLAY (DECK A)

d

: TAPE PLAY (DECK B)

G

: RECORD

J

: CD PLAY (ANALOG OUT)

c

: CD PLAY (DEGITAL OUT)

N

: MIC INPUT

Note: The components identified by mark 

0

 or dotted line

with mark 

0

 are critical for safety.

Replace only with part number specified.