Sony HTCNX-1 Service manual

HTC-NX1

SERVICE MANUAL

HTC-NX1 is the CD player and Tape
Deck section in MHC-NX1/NX3AV.

Dolby noise reduction manufactured under license
from Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol a are trade­marks of Dolby Laboratories Licensing Corporation.

CD
Section

Tape Deck
Section

US Model

Canadian Model

AEP Model

UK Model

E Model

Australian Model

Tourist Model

Model Name Using Similar Mechanism HCD-MD555
CD Mechanism Type CDM53D-K1BD33
Base Unit Name Type BU-K1BD33
Optical Pick-up Name KSM-213BFN-C2NP
Model Name Using Similar Mechanism HCD-GRX7
Tape Transport Mechanism Type TCM-230AWR2

SPECIFICATIONS

MICROFILM

MINI Hi-Fi COMPONENT SYSTEM

SECTION 1

SERVICING NOTES

TABLE OF CONTENTS

1. SERVICING NOTES ............................................... 2

2. GENERAL

Location of Controls ....................................................... 5

3. DISASSEMBLY ......................................................... 6

4. TEST MODE.............................................................. 13

5. MECHANICAL ADJUSTMENTS....................... 14

6. ELECTRICAL ADJUSTMENTS

TAPE DECK Section ...................................................... 14

CD Section ...................................................................... 17

7. DIAGRAMS

7-1. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 19

7-2. Printed Wiring Board – BD Board – ............................. 20

7-3. Schematic Diagram – BD Board – ................................ 21

7-4. Printed Wiring Boards

– CD MOTOR/SENSOR Section – ................................ 22

7-5. Schematic Diagram

– CD MOTOR/SENSOR Section – ................................ 23

7-6. Printed Wiring Board – AUDIO Board – ...................... 24

7-7. Schematic Diagram – AUDIO Board – ......................... 25

7-8. Printed Wiring Board – LEAF SW Board –.................. 26

7-9. Schematic Diagram – LEAF SW Board –..................... 26

7-10. Printed Wiring Board – MAIN Board – ........................ 27

7-11. Schematic Diagram – MAIN Board (1/2) – .................. 28

7-12. Schematic Diagram – MAIN Board (2/2) – .................. 29

7-13. Printed Wiring Boards – PANEL Section – .................. 30

7-14. Schematic Diagram – PANEL Section – ....................... 31

7-15. IC Pin Function Description ........................................... 34

This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on
the rear exterior.

Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.

The following caution label is located inside the unit.

CAUTION :

INTERLOCKS DEFEATED. AVOID EXPOSURE TO BEAM.

ADVARSEL :

SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION. UNDGÅ UDSAETTELSE
FOR STRÅLING.

VORSICHT :

ABDECKUNG GEÖFFNET UND SICHEREITSVERRIEGELUNG
ÜBERBRÜCKT. NICHT DEM STRAHL AUSSETZEN.

VARO!:

TIINA NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN.

VARNING :

OCH SPÄRREN ÄR URKOPPLAD. BETRAKTA EJ STRÅLEN.

ADVERSEL :

SIKKERHEDSLÅS BRYTES. UNNGÅ EKSPONERING FOR STRÅLEN.

VIGYAZAT!:

GÁRVESZÉLY

INVISIBLE LASER RADIATION WHEN OPEN AND

USYNLIG LASERSTRÅLING VED ÅBNING NÅR

UNSICHTBARE LASERSTRAHLUNG, WENN

AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALT -

OSYNLING LASERSTRÅLING NÄR DENNA DEL ÄR ÖPPNAD

USYNLIG LASERSTRÅLING NÅR DEKSEL ÅPNES OG

A BURKOLAT NYITÁSAKOR LÁTHATATLAN LÉZERSU-

!

KERÜLJE A BESUGÁRZÁST!

NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electro­static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.

8. EXPLODED VIEWS ................................................ 37

9. ELECTRICAL PARTS LIST ............................... 44

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ! OR DOTTED
LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANU AL OR IN SUPPLEMENTS PUB­LISHED BY SONY.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS P AR UNE MARQ UE !
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM­POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

NOTES ON LASER DIODE EMISSION CHECK

The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis­sion, observe from more than 30 cm away from the objecti ve lens.

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam­aged by heat.

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270 ˚C dur­ing repairing.

• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering
or unsoldering.

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra­diation exposure.

2

POWER SUPPLY DURING SERVICING

l

Connection:

• As this set has not own power supply, it does not operate inde­pendently. Therefore, during servicing, connect it to the Pre­Main amplifier and T uner Unit (STR-NX1/NX3) of MHC-NX1/
NX3AV.

SYSTEM CONTROL termina

Set

SYSTEM CONTROL terminal

Pre-Main AMP
and T uner Unit

Connector cable (19P)

AC IN

If STR-NX1/NX3 are not available, use the Po wer Feed Jig (PFJ-

1) and Relay Connector Jig.
In this case, after turn on the POWER switch on the Power Feed
Jig, supply power with the following methods.

Procedure:

1. Press three buttons of s (DECK B), A (DISC 1),

and s (CD) simultaneously.

2. The G (CD) and S (CD) LEDs blink, and then pressing G

(CD), G / g (DECK A), or G / g (DECK B) button can
make each play possible.

3. Also, the other functions are enabled by pressing two buttons

simultaneously.
A combination of respective functions and buttons is as fol­lows.

Connector cable (17P) of
attachment to power feed jig

Power feed jig
(PFJ-1)

CDP/TC

P707, P909

Relay connector jig
(J-2501-174-A)

ST

Exclusive cable (15P)

CD/TC signal
change switch

CN101 (15P)
SYSTEM CONTROL
terminal

Set

system cable

function button

CD AMS – s (DECK A), S (CD)

AMS + s (DECK A), s (CD)
FR s (DECK B), S (CD)
FF s (DECK B), s (CD)

Deck-A REW/AMS – s (CD), g (DECK A)

FF/AMS + s (CD), G (DECK A)

Deck-B REW/AMS – s (CD), g (DECK B)

FF/AMS + s (CD), G (DECK B)

3

OPTICAL PICK-UP CLEANING

1

Remove the case. (Refer to disassembly page 8)

2

four screws
(BVTP M2.6)

4

Cleaning the
optical pick-up.

3

Open the magnet
ass’y.

Note 1: In cleaning the lens, do not apply an excessive force.

As the optical pick-up is vulnerable, application of
excessive force could damage the lens holder.

Note 2: In cleaning, do not use a cleaner other than exclusive clean-

ing liquid (KK-91 or isopropyl alcohol).

Note 3: Wipe the objective lens spirally from center toward outside.

(See Figure A)

(Figure A)

4

• LOCATION OF CONTROLS

– Front Panel –

SECTION 2

GENERAL

6
7
8

123 45

qs qd qf qg qh qj qk

9
q;
qa

1 G (CD) button and indicator
2 S (CD) button and indicator
3 s (CD) button
4 DISC1 to 5 buttons and indicators
5 A (DISC1 to 5) buttons and indicators
6 g (DECK A) button and indicator
7 G (DECK A) button and indicator
8 s (DECK A) button
9 s (DECK B) button
q; G (DECK B) button and indicator
qa g (DECK B) button and indicator
qs A (DECK A) button
qd DIRECTION button
qf DOLBY NR button
qg HI DUB button
qh CD SYNC button and indicator
qj REC PAUSE/START button and indicator
qk A (DECK B) button

5

SECTION 3

r

DISASSEMBLY

Note: Follow the disassembly procedure in the numerical order given.

CASE

2

two screws
(case 3 TP2)

A

1

screw
(BVTP3

×

10)

3

Remove the case
in the arrow
direction.

2

two screws
(case 3 TP2)

A

FRONT PANEL SECTION

1

flat cable (15 core)
(CNS101)

4

claw

5

front panel
section

3

1

flat cable (17 core)
(16 cm)(CNS104)

two screws
(BVTP3 × 10)

4

claw

1

flat cable (21 core)
(CN102)

2

connecto
(CN105)

3

four screws
(BVTP3 × 5)

6

CD MECHANISM DECK SECTION

3

four screws
(BVTP3 × 10)

1

flat cable (17 core)
(12 cm) (CN112)

4

Remove the CD mechanism deck
section (CDM53D-K1BD33) in
the arrow A direction.

1

flat cable (19 core)
(CN111)

2

connector
(CN713)

A

to fitting base (guide)
ass’y, bracket (chassis)
and magnet ass’y
(page 9)

)

(CDM53D-K1BD33)

TAPE MECHANISM DECK SECTION
(TCM-230AWR2)

3

spring (eject A)

6

step screw

8

eject lever (A)

1

step screw

qa

bracket (MD A)

A

5

Remove the tape mechanism deck
section (TCM-230AWR2) in the
arrow A direction.

qs

shield plate

q;

4

two screws
(BVTP3 × 10)

1

step screw

2

spring (eject B)

6

step screw

7

eject lever (B

bracket (MD B)

9

two screws
(BVTT 2.6 × 6)

7

CD BASE UNIT (BU-K1BD33)

3

compression spring
(black)

1

two screws
(PTPWH M2.6)

4

CD base unit
(BU-K1BD33)

2

1

two screws
(PTPWH M2.6)

compression spring
(silver)

MAIN BOARD

2

4

two screws
(BVTP3 × 8)

A

Remove the MAIN board
in the arrow A direction.

3

three PC board
holders

2

1

connection cord
(CN101)

two screws
(BVTP3 × 10)

8

FITTING BASE (GUIDE) ASS’Y, BRACKET (CHASSIS) AND
MAGNET ASS’Y

5

bracket
(chassis)

screw
(BVTP M2.6)

from CD mechanism
deck section
(CDM53D-K1BD3)
(page 7)

3

fitting base
(guide) ass’y

2

four screws
(BVTP M2.6)

1

two connectors
(CN709, 715)

4

7

four screws
(BVTP M2.6)

4

screw
(BVTP M2.6)

6

connector
(CN710)

8

magnet ass’y

TRAY (SUB)

1

Rotating the pulley (LD), shift the slider (selection) in the arrow A direction.

2

Rotating the pulley (mode) in the arrow direction, adjust the tray (sub) to be removed.

3

Rotating the pulley (LD), shift the slider (selection) in the arrow B direction.

4

Rotating the pulley (mode) in the arrow direction, remove the tray (sub) to be removed.

pulley (LD)

stocker
section

tray (sub)

A

slider (selection)

B

pulley (mode)

9

CHASSIS (MOLD B) SECTION, STOCKER SECTION AND

)

SLIDER (SELECTION)

Note: In mounting the parts, refer to page 11 and 12.

6

two screws
(PTPWH M2.6)

5

stocker

4

section

pulley (LD)

two step
screws

7

slider (selection)

8

9

compression
spring

washer

1

three screws
(BVTP M2.6)

GEARS INSTALLATION

3

gear (gear B)

Adjust the gear (gear B) with the
portion A as shown.

1

Slide the slider (U/D)
fully in the arrow
direction.

portion A

4

two step screws

3

gear (eject)

2

chassis (mold B) section

Note: Rotating the pulley (LD),

shift the slider (selection
to the left.

10

2

gear (U/D slider)

slider (U/D) gear

Adjust the gear so that it meshes with
the bottom tooth of slider (U/D)gear,
as shown.

4

gear (gear A)

gear
(gear B)

Adjust so as to be aligned with
gear (B) linearly,as shown.

linearly

SLIDER (SELECTION) INSTALLATION

2

gear (chuking)

rotary encoder

Align with the slot of
rotary encoder.

1

rotary encoder

6

two screws
(PTPWH M2.6)

5

washer

4

compression spring

7

3

Insert the slider (selection)
into the portion A.

portion A

convex portion of
slider (selection)

gear (chuking)

align marking

STOCKER SECTION INSTALLATION

3

two step screws

1

stocker section

Insert a convex portion into
a groove of gear (chuking).

2

portion A of tray (sub)

Hook the portion A of tray (sub)

to the slider (selection).

potion A
of tray (sub)

sticking of
slider (selection)

3

two step screws

11

CHASSIS (MOLD B) SECTION INSTALLATION

n

3

three screws
(BVTP M2.6)

2

Insert the gear (eject)
under the gear (LD
deceleration).

gear (LD deceleration)

portion A

1

Insert the portion A of
chassis (mold B) sectio
into the portion B of
slider (selection).

portion B of
slider (selection)

12

SECTION 4

TEST MODE

[LED All Lit, Key Check Mode]

Procedure:

1. Press the ?/1 button to turn the power ON.

2. Press three buttons of s (DECK B), A (DISC 1), and

[DISC 5] simultaneously.

3. LEDs are all turned on.

Press the G (CD) button, and the key check mode is acti vated.
LEDs are all OFF.

4. When a button is pressed, the LED near the pressed button

blinks or lights up.
Also, if all buttons are pressed, all LEDs light up (not blink).

5. To release from this mode, press three buttons in the same

manner as step 2, or remove the power cord.

[CD Delivery Mode]

• This mode moves the optical pick-up to the position durable to
vibration. Use this mode when returning the set to the customer
after repair.

Procedure:

1. Press the ?/1 button to turn the power ON.

2. Press the s (DECK B) and [DISC 1] buttons simultaneously.

3. A message “LOCK” is displayed on the liquid crystal display

of the STR-NX1/NX3, and the CD delivery mode is set.

[Tape Deck Test Mode]
(In case of connected to the STR-NX1/NX3)

• If connected to the STR-NX1/NX3, the mode also acts as the
STR-NX1/NX3 amplifer test mode.

Procedure:

1. Press the ?/1 button to turn the power ON.

2. Press three buttons of s (DECK B), A (DISC 1), and S (CD)

simultaneously.

3. On liquid crystal display of the STR-NX1/NX3, the disc cal-

endar blinks, and “ALC OFF” is displayed, then the function
which was set before the test mode became active is displayed.

4. The automatic level control of the tape deck is in OFF status,

but while the
pressed during recording, automatic level control goes in ON
status.

[Tape Deck Test Mode]
(In case of connected to the power feed jig)

Procedure:

1. Turn on the Power switch on the power feed jig.

2. Press three buttons of s (DECK B), A (DISC 1),

and s (CD) simultaneously.

3. The G (CD) and S (CD) LEDs blink, and then pressing G

(CD), G / g (DECK A), or G / g (DECK B) button can
make each play possible.

4. Also, the other functions are enabled by pressing two buttons

simultaneously.
A combination of respective functions and buttons is as fol­lows.

s (CD) and [REC PAUSE/START] buttons are

function button

CD AMS – s (DECK A), S (CD)

AMS + s (DECK A), s (CD)
FR s (DECK B), S (CD)
FF s (DECK B), s (CD)

Deck-A REW/AMS – s (CD), g (DECK A)

FF/AMS + s (CD), G (DECK A)

Deck-B REW/AMS – s (CD), g (DECK B)

FF/AMS + s (CD), G (DECK B)

Note: Check that CD/TC signal change switch of relay connector jig is

set to the TC position.

13

SECTION 5

k

MECHANICAL ADJUSTMENTS

SECTION 6

ELECTRICAL ADJUSTMENTS

Precaution

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.

Torque Measurement

Mode

FWD
FWD

back tension
REV

REV
back tension

FF/REW

FWD tension

REV tension

Torque meter

CQ-102C

CQ-102C

CQ-102RC

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

Meter reading

31 to 71 g • cm

(0.43 – 0.98 oz • inch)

2 to 6 g • cm

(0.03 – 0.08 oz • inch)

31 to 71 g • cm

(0.43 – 0.98 oz • inch)

2 to 6 g • cm

(0.03 – 0.08 oz • inch)

71 to 143 g • cm

(0.99 – 1.99 oz • inch)

100 g or more

(3.53 oz or more)

100 g or more

(3.53 oz or more)

TAPE DECK SECTION

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 R­CH.

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

8. Set to the DOLBY NR OFF.

9. Set to the test mode. (See page 13)

• Test Tape

Tape Signal Used for

P-4-A100 10 kHz, –10 dB Azimuth Adjustment

WS-48B 3 kHz, 0 dB Tape Speed Adjustment

P-4-L300 315 Hz, 0 dB Level Adjustment

Record/Playback Head Azimuth Adjustment

DECK A DECK B

Note: Perform this adjustments for both decks

Procedure:

1. Mode: Playback

test tape
P-4-A100
(10 kHz, –10 dB)

set

PFJ-1

or

STR-NX1/

NX3

level meter

+
–

AUDIO OUT jac

14

2. T urn the adjustment screw and check output peaks. If the peaks

+

–

AUDIO OUT jack

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

frequency counter

set

STR-NX1/

NX3

+
–

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

level meter

AUDIO OUT jack

PFJ-1

or

STR-NX1/

NX3

set

do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.

Tape Speed Adjustment DECK B

• Execute only if connected to the STR-NX1/NX3

Mode: Playback

L-CH
peak

R-CH

Screw
position

peak

3. Mode: Playback

test tape
P-4-A100
(10 kHz, –10 dB)

L-CH

R-CH

in phase 45°90°135°180

within
1dB

Output
level

L-CH
peak

set

waveform of oscilloscope

STR-NX1/

good

R-CH
peak

AUDIO OUT (L) jack

PFJ-1

or

NX3

AUDIO OUT (R) jack

wrong

L-CH

R-CH

°

within
1dB

Screw
position

oscilloscope

H

V

1. Insert the WS-48B into the deck B.

2. Press the G (DECK B) button.

3. Press the [HI-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 [HI-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)

Playback level Adjustment

DECK A DECK B

Procedure:

Mode: Playback

4. Repeat step 1 to 3 in playback (REV) mode.

5. After the adjustments, apply suitable locking compound to the
pats adjusted.

Adjustment Location:Playback Head (Deck A).

Record/Playback/Earth Head (Deck B).

Open the cassette holder
and unhock six claws of
the sub panel (TC2)
with tweezers or something,
then remove the sub panel (TC2).

Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301
(L-CH) and RV401 (R-CH) so that adjustment within specified
value as follows.

Specified Value:

AUDIO OUT jack 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

forward

reverse

15

REC Bias Adjustment DECK B

Procedure:

1. Mode: Record

Specified value:

AUDIO OUT jack PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)

Adjustment Location: MAIN board

AUDIO IN jack



50 mV (–23.8 dB)




600

Ω

PFJ-1

or

STR-NX1/

NX3

blank tape
CN-123

set

AF OSC

1) 315 Hz

2) 10 kHz

attenuator

2. Mode: Playback

recorded
portion

set

PFJ-1

or

STR-NX1/

NX3

level meter

+
–

AUDIO OUT jack

3. Conf irm playback the signal recorded in step 1 become speci­fied value as follows.
If these values are out of specified value, adjust the RV341 (L­CH) and RV441 (R-CH) on the AUDIO board to repeat steps
1and 2.

Specified value: Playback output of 315 Hz to playback

output of 10 kHz: ± 0.5 dB

Adjustment Location: AUDIO board

REC Level Adjustment DECK B

Procedure:

1. Mode: Record

AUDIO IN jack

315 Hz, 50 mV (–23.8 dB)

AF OSC

attenuator

600

Ω

PFJ-1

or

STR-NX1/

NX3

set

blank tape
CN-123

– MAIN BOARD (Conductor Side) –

REC

LEVEL

– AUDIO BOARD (Component Side) –

RV441

RV401

RV301

LR

PB LEVEL

– DECK B –

– LEAF SW BOARD (Component Side) –

TAPE SPEED



(NORMAL) (HIGH)

RV1002



REC BIAS

RV1001

IC602

RL



CN601

RV341



CN1001

RV351




(R-CH)









RV311

LR

PB LEVEL

– DECK A –

IC301

RV301
(L-CH)

CN301

RV411



1

3

2. Mode: Playback

recorded
portion

set

PFJ-1

or

STR-NX1/

NX3

level meter

+
–

AUDIO OUT jack

3. Conf irm playback the signal recorded in step 1 become speci­fied value as follows.
If these values are out of specified value, adjust the RV301 (L­CH) and RV351 (R-CH) on the MAIN boar d to repeat ste ps 1
and 2.

16