DOWNLOAD Sony FST-ZX9 / HCD-ZX9 / LBT-ZX9 Service Manual ↓ Size: 8.81 MB | Pages: 94 in PDF or view online for FREE

25

0 dB=0.775 V

1. Demagnetize the record/playback head with a head

demagnetizer.

2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the

parts adjust.

4. The adjustments should be performed with the rated power

supply voltage unless otherwise noted.

5. The adjustments should be performed in the order given in this

service manual.  (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)

6. The adjustments should be performed for both L-CH and R-

CH.

7. Switches and controls should be set as follows unless otherwise

specified.

8. Set to the test mode.

(1) Press the  ?/1  button to turn the power ON.
(2) Select the function “TAPE A or B”.
(3) Press the button of  x (TC-B)  , [TUNER ENTER], and [DISC

3] simultaneously, to set the tape deck test mode and displays
“TEST MODE” on the fluorescent indicator tube.

(4) To release from the test mode, press the  ?/1  button.

• Test Tape

1. Clean the following parts with a denatured alcohol-moistened

swab:

record/playback heads

pinch rollers

erase head

rubber belts

capstan

idlers

2. Demagnetize the record/playback head with a head

demagnetizer.

3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the

parts adjusted.

5. The adjustments should be performed with the rated power

supply voltage unless otherwise noted.

Mode

Torque Meter

Meter Reading

2.9 – 6.9 mN • m

FWD

(30 to 70 g • cm)

CQ-102C

(0.42 – 0.97 oz • inch)

FWD

0.19 – 0.59 mN • m

back tension

(2 to 6 g • cm)

(0.03 – 0.08 oz • inch)

7.8 – 16.7 mN • m

FF/REW

CQ-201B

(80 to 170 g • cm)

(1.11 – 2.36 oz • inch)

Tape

Signal

Used for

P-4-A100

10 kHz, –10 dB

Azimuth Adjustment

WS-48B

3 kHz, 0 dB

Tape Speed Adjustment

26

 Perform this adjustments for both decks

Procedure:
1. Mode:  Playback (FWD)

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.

Screw
position

L-CH
peak

within
1dB

Output
level

L-CH
peak

R-CH
peak

within
1dB

Screw
position

R-CH
peak

set

test tape
P-4-A100
(10 kHz, – 10 dB)

R-CH

oscilloscope

L-CH

R-CH

V

H

waveform of oscilloscope

in phase 45

°

90

°

135

°

180

°

good

wrong

MAIN board
VIDEO/MD

 OUT jack (J701)

L-CH

reverse

forward

Adjustment Location: Playback Head (Deck A).

Record/Playback/Erase Head (Deck B).

set

MAIN board
VIDEO/MD OUT jack (J701)
L-CH, R-CH

+

level meter

test tape
P-4-A100
(10 kHz, – 10 dB)

27

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

Therefore, check each item in order given.

2. Use YEDS-18 (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M 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 TP102 (FE1) and TP117 (VC).
2. Press the  ?/1  button to turn the power ON.
3. Load a disc (YEDS-18) and actuate the focus search. (In

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

4. Confirm that the oscilloscope waveform (S-curve) is

symmetrical between A and B. And confirm peak to peak level
within 3 ±0.5 Vp-p.

• 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.

Procedure:
1. Connect oscilloscope to TP124 (RFACO) and TP117 (VC).
2. Press the  ?/1  button to turn the power ON.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check RFAC

signal level is correct or not.

BD81A board

Oscilloscope

TP0102(FE1)
TP117(VC)

TP124(RFACO)
TP117(VC)

BD81A board

oscilloscope

Clear RF signal waveform means that the shape “

◊” can be

clearly distinguished at the center of the waveform.

VOLT/DIV : 200mV
TIME/DIV : 500ns

level : 1.3 

±

 0.3Vp-p

TP117
 (VC)

TP124
(RFACO)

TP0102
 (FE1)

IC101

symmetry

S-curve waveform

within 3 

±

0.5Vp-p

A

B

28

VOLTAGE SELECTOR board

LIGHTING board

POWER SWITCHING

PANEL board

POWER SWITCH board

TC-A board

VOL board

MIC board

TC-B board

GAME-IN/HP board

CD-R board

CURSOR board

CD-L board

JOG board

FUNCTION SW board

MAIN board

SENSOR board

TRANS board

SURROUND board

POWER board

MD-94 board

SE-130 board

BD81A board