DOWNLOAD Sony HTC-NX1 / MHC-NX1 / MHC-NX3AV Service Manual ↓ Size: 4.1 MB | Pages: 52 in PDF or view online for FREE

17

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.

5. Use the following extension cables and relay connector.

• Extension cable (19P) (Part No. J-2501-011-B)

Relay connector (Part No. J-2501-167-A)
(BD board CN101 to MAIN board CN111)

• Extension cable (17P) (with connector) (Part No. J-2501-167-A)

(CONNECTOR board CN701 to MAIN board CN301)

Procedure:
1. Connect oscilloscope to TP (FEO).
2. Connect between TP (FEO) 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 turn the power ON again and ac-

tuate the focus search.  (Actuate the focus search when disc
tray is moving in and out)

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

between A and B.  And confirm peak to peak level within
2.4±0.7 Vp-p.

S-curve waveform

7. 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.

A

B

symmetry

within 2.4 

±

 0.7 Vp-p

+
–

BD board

TP (RF)
TP (VC)

oscilloscope

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

level:
1.2 

±

 0.2 Vp-p

+
–

BD board

TP (FEO)
TP (VC)

oscilloscope

Procedure:
1. Connect oscilloscope to TP (RF).

As TP (RF) and TP (VC) are located at the edge of board, clip
them together with the board using alligator clips.

2. Turn the power ON.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check RF sig-

nal level is correct or not.

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

RF signal waveform

18

– BD  BOARD (Side B) –

IC102

TP

(VC)

TP

(RF)

TP

(FEO)

IC101

TP (FEI)

TP (VC)

TP

(TEO)

TP

(GND)

TP

(AGCCON)

IC103

– MAIN  BOARD (Conductor Side) –

IC101

SL101
(ADJ)

19

19

Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted.  pF: µµF

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.

•

f

: internal component.

•

5

: fusible resistor.

•

C

: panel designation.

•

U

: B+ Line.

•

V

: 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.

E

: TAPE PLAYBACK (DECK A)

d

: TAPE PLAYBACK (DECK B)

G

: RECORD

J

: CD PLAY (ANALOG OUT)

c

: CD PLAY (DIGITAL OUT)

• Abbreviation

AUS

: Australian model

CND : Canadian model
JE

: Tourist model

KR

: Korean model

MY

: Malaysia model

SP

: Singapore model

TH

: Thai model

Note:
The components identi-
fied by mark 

0

  or dotted

line with mark 

0 

 are criti-

cal for safety.
Replace only with part
number specified.

Note:
Les composants identifiés par
une marque 

0

  sont critiques

pour la sécurité.
Ne les remplacer que par une
pièce por tant le numéro
spécifié.

Note on Printed Wiring Board:
•

X

: parts extracted from the component side.

•

Y

: parts extracted from the conductor side.

•

x

: parts mounted on the conductor side.

•

b

: Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

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.

• Indication of transistor.

C

B

These are omitted.

E

Q

B

These are omitted.

C

E

Q

B

These are omitted.

C

E

Q

CLAMP MOTOR board

BD board

IN SW board

INT/COUNT SW board

MAIN board

CONNECTOR board

LOAD MOTOR board

AUDIO board

OUT SW board

PANEL TC-A board

PANEL TC-B board

LEAF SW board

PANEL board

SENSOR board

SENSOR 2 board

20

20

TP

(GND)

Ref. No.

Location

Q101

C-3

Ref. No.

Location

IC101

C-2

IC102

B-3

IC103

B-3

(Page 27)