Aiwa CX-LDB30, CX-LDB50 Schematic

CX-LDB30/LDB50

SERVICE MANUAL

Ver. 1.1 2005.04

CX-LDB30/LDB50 are the Amplifier, CD player,
Tape Deck and Tuner section in XR-DB30/DB50.

CD CD Mechanism Type CDM80BV-F4BD81
Section Base Unit Name BU-F4BD81B

TAPE Model Name Using Similar Mechanism CX-LEM330
Section Tape Transport Mechanism T ype CMAL5Z220A

AEP Model

CX-LDB30/LDB50

UK Model

CX-LDB30

E Model

CX-LDB30/LDB50

Model Name Using Similar Mechanism NEW

Optical Pick-up Name KSM-215CFP/C2NP

CX-LDB50

European model:
DIN power output (rated): 60 + 60 W

(6 ohms at 1 kHz, DIN)

Continuous RMS power output (reference):

80 + 80 W
(6 ohms at 1 kHz, 10%
THD)

Music power output (reference):

200 + 200 W
(6 ohms at 1 kHz, 10%

THD)
Other models:
The following measured at AC 220 – 240 V, 50/60 Hz
DIN power output (rated): 60 + 60 W

(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference):

80 + 80 W

(6 ohms at 1 kHz, 10%

THD)

SPECIFICATIONS

CX-LDB30

European model:
DIN power output (rated): 45 + 45 W

(6 ohms at 1 kHz, DIN)

Continuous RMS power output (reference):

60 + 60 W
(6 ohms at 1 kHz, 10%
THD)

Music power output (reference):

140 + 140 W
(6 ohms at 1 kHz, 10%
THD)

Other models:
The following measured at AC 220 – 240 V, 50/60 Hz
DIN power output (rated): 45 + 45 W

(6 ohms at 1 kHz, DIN)

Continuous RMS power output (reference):

60 + 60 W
(6 ohms at 1 kHz, 10%
THD)

MICRO HI-FI COMPONENT SYSTEM

Inputs
AUDIO IN (RCA pin jacks):

Outputs
PHONES (stereo mini jack):

SPEAKER: accepts impedance of

CD player section

System Compact disc and digital

Laser Diode Properties Emission duration:

*This output is the value measurement at a distance of

200 mm from the objective lens surface on the
Optical Pick-up Block with 7 mm aperture

Sensitivity 700 mV,
impedance 47 kilohms

accepts headphones with
an impedance of 32 ohms
or more

6ohms

audio system

continuous
Laser Output*: Less than

µW

44.6

— Continued on next page —

9-879-476-02

2005D16-1
© 2005.04

Sony Corporation

Personal Audio Group
Published by Sony Engineering Corporation

CX-LDB30/LDB50

Frequency response 20 Hz – 20 kHz
Signal-to-noise ratio More than 90 dB
Dynamic range More than 90 dB

Tape deck section

Recording system 4-track 2-channel stereo
Frequency response 100 – 10,000 Hz, using

Sony TYPE I cassettes

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range 87.5 – 108.0 MHz

(50-kHz step)
Antenna FM lead antenna
Antenna terminals 75 ohms unbalanced
Intermediate frequency 10.7 MHz

AM tuner section

Tuning range
European model: 531 – 1,602 kHz

(with the tuning interval

set at 9 kHz)
Other models: 530 – 1,710 kHz

(with the tuning interval

set at 10 kHz)

531 – 1,602 kHz

(with the tuning interval

set at 9 kHz)
Antenna AM loop antenna, external

antenna terminal
Intermediate frequency 450 kHz

General

Power requirements
European model: AC 230 V, 50/60 Hz
Other models: AC 120, 220 or

230 – 240 V, 50/60 Hz
Adjustable with voltage

selector
Power consumption
XR-DB50
European model: 85 W

0.3 W (in Power Saving

mode)
Other models: 85 W
XR-DB30
European model: 70 W

0.3 W (in Power Saving

mode)
Other models: 70 W
Dimensions (w/h/d) excl. speakers:

Approx. 190 x 277 x

269 mm
Mass excl. speakers
CX-LDB50: 5.4 kg
CX-LDB30: 5.1 kg

Design and specifications are subject to change
without notice.

•Standby power consumption: 0.3 W

•Halogenated flame retardants are not
used in the certain printed wiring boards.

•Lead-free solder is used for soldering
certain parts.

•Halogenated flame retardants are not
used in cabinets.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 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 MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.

2

TABLE OF CONTENTS

CX-LDB30/LDB50

1. SERVICING NOTES ................................................ 4

2. GENERAL ................................................................... 5

3. DISASSEMBLY

3-1. Disassembly Flow ........................................................... 7

3-2. Side Panel (L)(R), Top Panel, Back Panel ....................... 8

3-3. CD Mechanism Section ................................................... 8

3-4. Front Panel Section ......................................................... 9

3-5. Power Transformer .......................................................... 9

3-6. MAIN Board.................................................................... 10

3-7. PANEL Board, CD EJECT Board, JACK Board ............ 10

3-8. Cassette Deck Mechanism............................................... 11

3-9. Cassette Panel .................................................................. 11

3-10. CD Mechanism Deck (CDM80BV-F4BD81) ................. 12

3-11. Chassis (Top) ................................................................... 12

3-12. Lever (Loading R/L)........................................................ 13

3-13. Disc Stop Lever, Disc Sensor Lever ................................ 14

3-14. DRIVER Board ............................................................... 14

3-15. BD Board ......................................................................... 15

3-16. Optical Pick-up (KSM-215CFP/C2NP) .......................... 15

3-17. Base Unit (BU-F4BD81B) .............................................. 16

3-18. Lever (BU Lock) ............................................................. 16

3-19. Close Lever ...................................................................... 17

3-20. DIR Lever, Gear (IDL-B) ................................................ 17

3-21. Gear (IDL-C) ................................................................... 18

4. TEST MODE ............................................................... 19

5. MECHANICAL ADJUSTMENTS......................... 20

6. ELECTRICAL ADJUSTMENTS .......................... 20

7. DIAGRAMS

7-1. Block Diagram — BD Section — ................................... 25

7-2. Block Diagram — MAIN Section — .............................. 26

7-3. Printed Wiring Board — BD Board — ........................... 27

7-4. Schematic Diagram — BD Board — .............................. 28

7-5. Printed Wiring Board

— DRIVER Board, JACK Board — ............................... 29

7-6. Schematic Diagram

— DRIVER Board, JACK Board — ............................... 30

7-7. Printed Wiring Board — MAIN Section (1/2) — ........... 31

7-8. Printed Wiring Board — MAIN Section (2/2) — ........... 32

7-9. Schematic Diagram — MAIN Section (1/5) — .............. 33

7-10. Schematic Diagram — MAIN Section (2/5) — .............. 34

7-11. Schematic Diagram — MAIN Section (3/5) — .............. 35

7-12. Schematic Diagram — MAIN Section (4/5) — .............. 36

7-13. Schematic Diagram — MAIN Section (5/5) — .............. 37

7-14. Printed Wiring Board — PANEL Board — .................... 38

7-15. Schematic Diagram — PANEL Board — ....................... 39

7-16. Printed Wiring Board — PT Board — ............................ 40

7-17. Schematic Diagram — PT Board — ............................... 41

8. EXPLODED VIEWS

8-1. Panel Section ................................................................... 47

8-2. Front Panel Section ......................................................... 48

8-3. Chassis Section ................................................................ 49

8-4. CD Mechanism Deck Section 1 (CDM80BV-F4BD81) . 50
8-5. CD Mechanism Deck Section 2 (CDM80BV-F4BD81) . 51
8-6. CD Mechanism Deck Section 3 (CDM80BV-F4BD81) . 52

8-7. Base Unit Section ............................................................ 53

9. ELECTRICAL PARTS LIST .................................. 54

3

CX-LDB30/LDB50

SECTION 1

SERVICING NOTES

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.

UNLEADED SOLDER

Boards requiring use of unleaded solder are printed with the lead­free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size)

: LEAD FREE MARK

Unleaded solder has the following characteristics.

• Unleaded solder melts at a temperature about 40 °C higher

than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if

the heated tip is applied for too long, so be careful!

• Strong viscosity

Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.

• Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

CAUTION

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

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

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

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.

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 pick­up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.

LASER DIODE AND FOCUS SEARCH OPERATION
CHECK

Carry out the “S curve check” in “CD section adjustment” and check
that the S curve waveforms is output three times.

4

SECTION 2

GENERAL

List of button locations and reference pages

CX-LDB30/LDB50

This section is extracted
from instruction manual.

How to use this page

Use this page to find the location of buttons and other
parts of the system that are mentioned in the text.

Main unit

ALPHABETICAL ORDER

A – O

AUDIO IN w; (17, 23, 27)
AUDIO IN jack qs (19, 23)
BASS control 7 (17)
CD SYNC qk (16)
Disc slot 9
DISPLAY 3 (15, 21, 22)
Display window 4
FOLDER +/– qg (10, 11, 16)
i-Bass 5 (17)

P – Z

PHONES jack qd
PLAY MODE ql (10, 11, 16, 26)
Remote sensor 2
TREBLE control 6 (17)
TUNER/BAND w; (12, 14, 17)
TUNING +/– qf (12, 14)
TUNING MODE ql (12, 14)
VOLUME control q; (18, 25)

1

23 4 5 67 8

Illustration number

r

DISPLAY ws (15, 21)

Name of button/part Reference page

RR

BUTTON DESCRIPTIONS

?/1 (power) 1 (7, 14, 27)
Z CD (eject) 8 (8, 9)
Z PUSH qa (16)
./> (go back/go forward)

qf (10)

m/M (rewind/fast forward)

qf (8, 10, 14, 16)

x (stop) qh (10, 13, 16)
z REC PAUSE/START qj (16)

TAPE/N (play) w; (16)
CD/NX (play pause) w; (10)

w;
ql

qk

HHS

sjJ

qh

qj

qg

9

q;

qa

qs

qd

qf

5

CX-LDB30/LDB50

Remote control

ALPHABETICAL ORDER

A – O

CD qh (9, 11, 13, 16, 17)
CLEAR qd (12)
CLOCK/TIMER SELECT 2

(19, 20, 25)

CLOCK/TIMER SET 3 (8, 18,

19)
DISPLAY ql (15, 21, 22)
ENTER 9 (8, 11, 13, 18, 19)
EQ qs (17)
FM MODE 4 (15, 27)
FOLDER +/– qa (10, 11, 16)
FUNCTION 6 (8, 9, 11, 12, 14,

16, 17, 23, 27)

P – Z

PLAY MODE qk (10, 11, 16, 26,

28)
REPEAT 4 (11)
SLEEP w; (18)
TAPE qg (16, 17)
TUNER/BAND 5 (12, 14, 17)
TUNER MEMORY qj (13)
TUNING MODE qk (12, 14)
VOLUME +/– q; (18, 25)

w;

ql
qk
qj
qh
qg

qf

BUTTON DESCRIPTIONS

?/1 (power) 1 (7, 14, 19)
m/M (rewind/fast forward)

7 (10, 14, 16)

X (pause) 8 (10, 16)
x (stop) 8 (10, 16)
N (play) 8 (10, 16)

–/+(tuning) qf (12, 17)
./> (go back/go forward)

qf (8, 10, 18)

1

2
3
4

5
6

7

qd
qs

qa

8

9
0

Setting the clock

Use buttons on the remote for the operation.

1

Press ?/1 to turn on the system.

2

Press CLOCK/TIMER SET.

3

Press . or > repeatedly to set the
hour.

4

Press ENTER.

5

Press . or > repeatedly to set the
minute.

6

Press ENTER.

The clock starts working.

To adjust the clock

1

Press CLOCK/TIMER SET.

2

Press . or > until "CLOCK SET?"
appears, then press ENTER.

3

Do the same procedures as step 3 to 6
above.

Notes

The clock settings are canceled when you disconnect

the power cord or if a power failure occurs.

You cannot set the clock in Power Saving Mode

(page 21).

6

3-1. DISASSEMBLY FLOW

3-3.CD MECHANISM SECTION

(Page 8)

3-10.CD MECHANISM DECK

(CDM80BV-F4BD81)

(Page 12)

3-7.PANEL BOARD, CD EJECT BOARD,

JACK BOARD

(Page 10)

3-4.FRONT PANEL SECTION

(Page 9)

3-8.CASSETTE DECK MECHANISM

(Page 11)

3-6.MAIN BOARD

(Page 10)

3-5.POWER TRANSFORMER

(Page 9)

3-9.CASSETTE PANEL

(Page 11)

3-2.SIDE PANEL (L) (R), TOP PANEL,

BACK PANEL

(Page 8)

SET

3-11.CHASSIS (TOP)

(Page 12)

3-14.DRIVER BOARD

(Page 14)

3-17.BASE UNIT

(BU-F4BD81B)

(Page 16)

3-13.DISC STOP LEVER,

DISC SENSOR LEVER

(Page 14)

3-15.BD BOARD

(Page 15)

3-16.OPTICAL PICK-UP

(KSM-215CFP/C2NP)

(Page 15)

3-18.LEVER (BU LOCK)

(Page 16)

3-19.CLOSE LEVER

(Page 17)

3-20. DIR LEVER,

GEAR (IDL-B)

(Page 17)

3-21. GEAR (IDL-C)

(Page 18)

3-12.LEVER (LOADING R/L)

(Page 13)

•This set can be disassembled in the order shown below.

CX-LDB30/LDB50

SECTION 3

DISASSEMBLY

7

CX-LDB30/LDB50

)

n

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

3-2. SIDE PANEL (L)(R), TOP PANEL, BACK PANEL

qa

top panel

3

side panel (L)

2

three claws

8

screw

×

(QT2+3

10)

9

screw
(QT2+3

×

10)

qh

back panel

qg

connector
2p(CN292)

q;

screw (+BVTP3 × 10)

qs

two screws
(+BVTP3

qd

×

10)

two screws
(+BVTP3

qf

six screws
(+BVTP3

×

10)

×

10

1

four screws
(+BVTP3

×

10)

3-3. CD MECHANISM SECTION

3

screw

×

(QT2+3

5

claw

10)

7

6

side panel (R)

2

w

ire (flat type)

15core (CN602)

screw
(QT2+3

×

1

27core (CN902)

10)

w

ire (flat type)

4

six screws
(+BVTP3

5

three claws

×

10)

6

connector
7p(CN701)

4

two screws
(QT2+3 × 10)

7

CD mechanism sectio

8

3-4. FRONT PANEL SECTION

1

w

ire (flat type)

19core (CN904)

2

w

ire (flat type)

8core (CN901)

7

screw
(QT2+3 × 10)

3

w

ire (flat type)

7core (CN905)

4

connector

7p (CNA302)

CX-LDB30/LDB50

9

two claws

0

front panel section

3-5. PO WER TRANSFORMER

6

tapping screw (B3)

7

two claws

4

connector

8p (CN002)

qa

power transformer

8

holder

0

8

screw
(QT2+3 × 10)

(pwb PT)

9

6

four

screws

qs

plate

2

15core

two

tapping screws (B3)

(PT shield)

w

ire (flat type)

5

screw (+B3)

3

tuner (FM/AM)

5

2p (CN001)

1

connector

tapping screw (B3)

9

CX-LDB30/LDB50

)

)

3-6. MAIN BOARD

7

two

screws (B3)

8

two

screws (B3)

tapping

tapping

0

MAIN board

2

two

screws (+BV3)

5

tapping screw (B3)

clamp

4

w

ire (flat type)

15core (CN602)

9

heat sink (main)

6

two

tapping screws (B3)

3

screw (+BV3

1

connector

8p (CN002)

3-7. PANEL BOARD, CD EJECT BOARD, JACK BOARD

0

CD EJECT board

6

knob (VOL)

5

two knobs B/T

8

claw

7

tapping screw (B2.6)

qa

19core (CN502)

w

ire (flat type)

qs

PANEL board

9

eleven

tapping screws (B2.6

10

4

JACK board

2

holder board

1

two

tapping screws (B3)

3

w

ire (flat type)

9core (CN203)

3-8. CASSETTE DECK MECHANISM

4

w

ire (flat type) 7core

5

CX-LDB30/LDB50

cassette deck mechanism

3

two screws
(B3)

3-9. CASSETTE PANEL

2

Open the
cassette panel.

1

Push the
cassette panel.

2

clamp

1

two screws
(B3)

3

four claws

4

cassette panel

11

CX-LDB30/LDB50

k

)

)

3-10. CD MECHANISM DECK (CDM80BV-F4BD81)

1

four

tapping screws (B3)

2

two claws

3

CD HOLDER

4

CD mechanism dec

(CDM80BV-F4BD81

3-11. CHASSIS (TOP)

3

two screws

(+P 2

5

chassis (top)

4

three screws

(+BVTP 2.6

×

10)

1

×

8)

screw

(+BVTP 2.6

2

lever (CL UP2

×

8)

12

)

3-12. LEVER (LOADING R/L)

CX-LDB30/LDB50

5

lever (loading-R)

1

torsion spring (loading LV) torsion spring (loading RV)

4

two hooks

1

2

two hooks

3

lever (loading-L

PRECAUTION DURING LEVER (LOADING R / L) INSTALLATION

Align the horizontal position.

lever (loading-L)

Install the

both levers so that they move symmetrically.

lever (loading-R)

13

CX-LDB30/LDB50

3-13. DISC STOP LEVER, DISC SENSOR LEVER

1

gear (cap)

2

gear (IDL-L)

PRECAUTION DURING DISC STOP LEVER INSTALLATION

5

two hooks

6

disc stop lever

3-14. DRIVER BOARD

3

Remove soldering

from the two points.

3

two claws

4

disc sensor lever

hole

hole

Install the disc stop lever so that the both holes
are aligned.

2

two screws

(+BVTP 2.6

×

8)

5

DRIVER board

chassis (top)

disc stop lever

14

4

motor (pulley) assy

1

belt (MOT)

s

3-15. BD BOARD

1

CN101

4

B

D board

CX-LDB30/LDB50

3

Remove the two solderings.

2

Remove the two solderings.

3-16. OPTICAL PICK-UP (KSM-215CFP/C2NP)

3

two floating screws
(+PTPWHM 2.6)

6

two insulators

2

tension spring (F-2)

1

tension spring (F-1)

4

two floating screws
(+PTPWHM 2.6)

5

two insulator

7

optical pick-up

(KSM-215CFP/C2NP)

15

CX-LDB30/LDB50

3-17. BASE UNIT (BU-F4BD81B)

6

base unit

(BU-F4BD81B)

4

floating screw

(+PTPWHM 2.6)

3

holder down b spring

3-18. LEVER (BU LOCK)

5

lever (BU lock)

1

gear (cap)

2

gear (BU lock)

2

lever (CL UP2)

1

screw

(+BVTP 2.6

5

floating screw

(+PTPWHM 2.6)

×

8)

4

three hooks

3

16

g

3-19. CLOSE LEVER

3

claw

5

close lever

1

washer (3-1-0.4)

2

close lever sprin

4

shaft disc stop

CX-LDB30/LDB50

3-20. DIR LEVER, GEAR (IDL-B)

2

capstan retaining ring

1

tension coil spring (DIR)

6

Loosen the screw.

9

DIR lever

3

gear pulley

4

gear (cap)

5

gear (IDL-A)

0

gear (IDL-B)

8

stopper

7

Hold the release lever

and change the direction.

17

CX-LDB30/LDB50

3-21. GEAR (IDL-C)

3

gear (IDL-D)

2

1

gear (IDL-F)

7

gear (IDL-C)

6

two claws

claw

4

three hooks

5

gear loading lever

18

SECTION 4

TEST MODE

CX-LDB30/LDB50

[COLD RESET]

* The cold reset clears all data including preset data stored in

the RAM to initial conditions. Execute this mode when
returning the set to the customer.

Procedure:

1. Press the ?/1 button to turn off the main power.

2. Press two buttons of [AUDIO IN] and ?/1 simultaneously for

more than two seconds.

3. The fluorescent indicator tube does not display any message
and the set is reset.

[COMMON TEST]

*This mode is used to check the function of the amplifier.

Procedure:

1. Press the ?/1 button to turn the set on.

2. Press two buttons of x and [DISPLAY] simultaneously for
more than two seconds.

3. The message “Volume MAX” is displayed, when the
[VOLUME] knob is rotated clockwise. The message “Volume
MIN” is displayed, when the [VOLUME] knob is rotated
counterclockwise.

4. Each time the [BASS] or [TREBLE] knob is turned or Press the
[EQ] button (RM), the message “TONE MAX”, “TONE MIN”
or “TONE FLAT” is displayed in this order.

[P ANEL TEST]

*The panel test, the version, and inducing is displayed.

Procedure:

1. Press the ?/1 button to turn off the main power.

2. Press two buttons of [AUDIO IN] and [DISPLAY] simultaneously
for more than two seconds.

3. All lighting display is done.

4. 4-1. To enter the test mode, press the button [i-Bass]

simultaneously.
The version of the microcomputer is displayed.

4-2. To enter the key test mode, press the button [PLAY MODE/

TUNING MODE] simultaneously.
The version of the microcomputer is displayed.

5. Press two buttons of [AUDIO IN] and [DISPLAY] simultaneously
for more than two seconds, it ends.

[CD Repeat 5 Times Limit Release Mode]

Procedure:

1. Press the ?/1 button to turn the set on.

2. Select the FUNCTION to CD.

3. Press two buttons of Z CD and [PLAY MODE/TUNING MODE]
simultaneously for more than two seconds.

4. The repeat all mark blinks and then repeat 5 times limit is
released.

[Disc anti-theft]

Procedure:

1. Press the ?/1 button to turn the set on.

2. Set the FUNCTION to CD.

3. Press two buttons of x and Z CD simultaneously for more

than five seconds.

4. Press two buttons of x and Z CD simultaneously for more

than five seconds to turn the set off.

[CD ERROR CODE]

Procedure:

1. Press the ?/1 button to turn the set on.

2. Set the FUNCTION to CD.

3. Press two buttons of CD u and [DISPLAY] simultaneously

for more than two seconds.

4. Switch the CDM/NO DISC using > , . .
Advance the number using > , Reverse the number using
. .

[CD SERVICE MODE Mode]

*This mode can run the CD sled motor freely. Use this mode,

for instance, when cleaning the pickup.

Procedure:

1. Press the ?/1 button to turn the set on.

2. Set the FUNCTION to CD.

3. While depressing the CD u button, Press the [i-Bass] button.
The message “SERVICE MODE” is displayed.

4. With the CD in stop status, press the > button to move the
pickup to outside track, or press the . button to inside
track.

5. When press the CD u button, normal playback is
performed.

6. Each time the CD u button is pressed during normal
playback, the tracking servo is switched on or off.

7. To exit this mode, either change to other functions or extract
an AC plug.

[AM Channel Step 9 kHz/10kHz Selection Mode]

* Either the 9 kHz step or 10 kHz step can be selected for the

AM channel step.

Procedure:

1. Turn on the power, and press the [TUNER] button to select the
AMP band.

2. Turn off the power.

3Press the > button and the ?/1 button at the same time to

enter this mode.

[CD Ship Mode and Memory clear]

*This mode moves the optical pick-up to the position durable

to vibration and Memory Clear. Use this mode when returning
the set to the customer after repair.

Procedure:

1. Press the ?/1 button to turn the set on.

2. Set the FUNCTION to CD.

3. Press two buttons of Z CD and > simultaneously for

more than two seconds.

4. After a message “MECHA LOCK” is displayed on the
fluorescent indicator tube, the CD ship mode is set and the
power is turned off.

19

CX-LDB30/LDB50

set

MAIN board
SPEAKER terminal (J201)
L-CH, R-CH

+
–

level meter

test tape
P-4-A100
(10 kHz, –10 dB)

SECTION 5

MECHANICAL ADJUSTMENTS

SECTION 6

ELECTRICAL ADJUSTMENTS

TAPE MECHANISM DECK SECTION

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 Meter reading

2.94 – 7.84 mN • m

CQ-102C

CQ-102C

CQ-102RC

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

(30 to 79 g • cm)

(0.42 – 1.11 oz • inch)

0.15 – 0.59 mN • m
(2 to 6 g • cm)

(0.03 – 0.08 oz • inch)

2.94 – 7.84 mN • m

(30 to 79 g • cm)

(0.42 – 1.11 oz • inch)

0.15 – 0.59 mN • m
(2 to 6 g • cm)

(0.03 – 0.08 oz • inch)

6.86 – 17.64 mN • m
(70 to 179 g • cm)

(0.98 – 2.49 oz • inch)

9.8 mN • m or more

(100 g • cm or more)

(1.4 oz • inch or more)

9.8 mN • m or more

(100 g • cm or more)

(1.4 oz • inch or more)

DECK SECTION 0 dB=0.775V

Precaution

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 adjusted.

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.

• Test Tape

Signal Used forTape

P-4-A100

WS-48B

Record/Playback Head Azimuth Adjustment

Procedure:

1. Mode : Playback

10 kHz, –10 dB

3 kHz, 0 dB

Azimuth Adjustment

Tape Speed Check

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 1 dB of peak.

Output
level

within
1dB

L-CH
peak

R-CH
peak

within
1dB

Screw
position

L-CH
peak

Screw
position

R-CH
peak

20