Sony CX-LDB30 User manual

SERVICE MANUAL
Sony Corporation
Personal Audio Group
Published by Sony Engineering Corporation
AEP Model
CX-LDB30/LDB50
UK Model
CX-LDB30
E Model
CX-LDB30/LDB50
MICRO HI-FI COMPONENT SYSTEM
9-879-476-02
2005D16-1
© 2005.04
Ver. 1.1 2005.04
SPECIFICATIONS
CX-LDB30/LDB50
CX-LDB30/LDB50 are the Amplifier, CD player,
Tape Deck andTuner section in XR-DB30/DB50.
— Continued on next page —
Model Name Using Similar Mechanism NEW
CD CD Mechanism Type CDM80BV-F4BD81
Section Base Unit Name BU-F4BD81B
Optical Pick-up Name KSM-215CFP/C2NP
TAPE Model Name Using Similar Mechanism CX-LEM330
Section Tape Transport Mechanism Type CMAL5Z220A
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)
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)
Inputs
AUDIO IN (RCA pin jacks):
Sensitivity 700 mV,
impedance 47 kilohms
Outputs
PHONES (stereo mini jack):
accepts headphones with
an impedance of 32 ohms
or more
SPEAKER: accepts impedance of
6ohms
CD player section
System Compact disc and digital
audio system
Laser Diode Properties Emission duration:
continuous
Laser Output*: Less than
44.6 µW
*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

2
CX-LDB30/LDB50
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE
WITH MARK 0ON 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.
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.

3
CX-LDB30/LDB50
TABLE OF CONTENTS
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. EXPLODEDVIEWS
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

4
CX-LDB30/LDB50 SECTION 1
SERVICING NOTES
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 pick-
up 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.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
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.
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free 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.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on the
exterior.

5
CX-LDB30/LDB50
SECTION 2
GENERAL This section is extracted
from instruction manual.
Main unit
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)
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 (power) 1(7, 14, 27)
ZCD (eject) 8(8, 9)
ZPUSH qa (16)
./> (go back/go forward)
qf (10)
m/M (rewind/fast forward)
qf (8, 10, 14, 16)
x(stop) qh (10, 13, 16)
zREC PAUSE/START qj (16)
TAPE/N(play) w; (16)
CD/NX (play pause) w; (10)
List of button locations and reference pages
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.
Illustration number
r
DISPLAY ws (15, 21)
RR
Name of button/part Reference page
ALPHABETICAL ORDER
A – O P – Z
BUTTON DESCRIPTIONS
HHS
sjJ
1
w;
ql
23 45 67 8
9
q;
qa
qs
qkqjqhqg qf
qd

6
CX-LDB30/LDB50
Remote control
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)
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)
?/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)
ALPHABETICAL ORDER
A – O P – Z
BUTTON DESCRIPTIONS
4
5
6
7
8
9
0
3
2
1
qa
qd
qs
ql
qk
qj
qh
qg
qf
w;
Use buttons on the remote for the operation.
1 Press ?/1 to turn on the system.
2Press CLOCK/TIMER SET.
3Press .or >repeatedly to set the
hour.
4Press ENTER.
5Press .or >repeatedly to set the
minute.
6Press ENTER.
The clock starts working.
To adjust the clock
1Press CLOCK/TIMER SET.
2Press .or >until "CLOCK SET?"
appears, then press ENTER.
3Do 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).
Setting the clock

7
CX-LDB30/LDB50
SECTION 3
DISASSEMBLY
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.

8
CX-LDB30/LDB50
Note: Follow the disassembly procedure in the numerical order given.
qg connector
2p(CN292)
1 four screws
(+BVTP3
× 10)
4 six screws
(+BVTP3
× 10)
qs two screws
(+BVTP3
× 10)
qd two screws
(+BVTP3
× 10)
qf six screws
(+BVTP3
× 10
)
q; screw (+BVTP3 × 10)
3 side panel (L)
qa top panel
qh back panel
7 screw
(QT2+3
× 10)
8 screw
(QT2+3
× 10)
9 screw
(QT2+3
× 10)
5 three claws
2 three claws
6 side panel (R)
7 CD mechanism sectio
n
2 w ire (flat type)
15core (CN602)
1 w ire (flat type)
27core (CN902)
3 screw
(QT2+3
× 10)
4 two screws
(QT2+3 × 10)
5 claw
6 connector
7p(CN701)
3-2. SIDE PANEL (L)(R),TOP PANEL, BACK PANEL
3-3. CD MECHANISM SECTION

9
CX-LDB30/LDB50
3 w ire (flat type)
7core (CN905)
2 w ire (flat type)
8core (CN901)
4 connector
7p (CNA302)
1 w ire (flat type)
19core (CN904)
7 screw
(QT2+3 × 10)
8 screw
(QT2+3 × 10)
5 screw (+B3)
9 two claws
0 front panel section
6 two tapping screws (B3)
1 tapping screw (B3)
6 tapping screw (B3)
3 tuner (FM/AM)
9 four screws
qa power transformer
0
4 connector
8p (CN002)
5 connector
2p (CN001)
2 w ire (flat type)
15core
qs plate (PT shield)
8 holder (pwb PT)
7 two claws
3-4. FRONT PANEL SECTION
3-5. POWERTRANSFORMER

10
CX-LDB30/LDB50
5 tapping screw (B3)
6 two tapping screws (B3)
7 two tapping
screws (B3)
8 two tapping
screws (B3)
3 screw (+BV3
)
2 two screws (+BV3)
9 heat sink (main)
0 MAIN board
clamp
1 connector
8p (CN002)
4 w ire (flat type)
15core (CN602)
7 tapping screw (B2.6)
9 eleven tapping screws (B2.6
)
1 two tapping screws (B3)
4 JACK board
0 CD EJECT board
qs PANEL board
2 holder board
3 w ire (flat type)
9core (CN203)
qa w ire (flat type)
19core (CN502)
6 knob (VOL)
5 two knobs B/T
8 claw
3-6. MAIN BOARD
3-7. PANEL BOARD, CD EJECT BOARD, JACK BOARD

11
CX-LDB30/LDB50
5 cassette deck mechanism
1 two screws
(B3)
2 clamp
3 two screws
(B3)
4 w ire (flat type) 7core
4 cassette panel
3 four claws
2 Open the
cassette panel.
1 Push the
cassette panel.
3-8. CASSETTE DECK MECHANISM
3-9. CASSETTE PANEL

12
CX-LDB30/LDB50
4 CD mechanism dec
k
(CDM80BV-F4BD81
)
3 CD HOLDER
2 two claws
1 four tapping screws (B3)
1 screw
(+BVTP 2.6
× 8)
2 lever (CL UP2
)
4 three screws
(+BVTP 2.6
× 8)
3 two screws
(+P 2
× 10)
5 chassis (top)
3-10. CD MECHANISM DECK (CDM80BV-F4BD81)
3-11. CHASSIS (TOP)

13
CX-LDB30/LDB50
lever (loading-R)
Align the horizontal position.
lever (loading-L)
Install the both levers so that they move symmetrically.
torsion spring (loading LV) torsion spring (loading RV)
1
1
PRECAUTION DURING LEVER (LOADING R / L) INSTALLATION
3 lever (loading-L
)
2 two hooks
4 two hooks
5 lever (loading-R)
3-12. LEVER (LOADING R/L)

14
CX-LDB30/LDB50
chassis (top)
hole
Install the disc stop lever so that the both holes
are aligned.
hole
disc stop lever
PRECAUTION DURING DISC STOP LEVER INSTALLATION
1 gear (cap)
2 gear (IDL-L)
3 two claws
5 two hooks
4 disc sensor lever
6 disc stop lever
2 two screws
(+BVTP 2.6
× 8)
3 Remove soldering
from the two points.
4 motor (pulley) assy
5 DRIVER board
1 belt (MOT)
3-13. DISC STOP LEVER, DISC SENSOR LEVER
3-14. DRIVER BOARD

15
CX-LDB30/LDB50
1 CN101
2 Remove the two solderings.
4 B D board
3 Remove the two solderings.
5 two insulator
s
7 optical pick-up
(KSM-215CFP/C2NP)
6 two insulators
1 tension spring (F-1)
2 tension spring (F-2)
3 two floating screws
(+PTPWHM 2.6)
4 two floating screws
(+PTPWHM 2.6)
3-15. BD BOARD
3-16. OPTICAL PICK-UP (KSM-215CFP/C2NP)

16
CX-LDB30/LDB50
1 screw
(+BVTP 2.6
× 8)
2 lever (CL UP2)
3 holder down b spring
4 floating screw
(+PTPWHM 2.6)
5 floating screw
(+PTPWHM 2.6)
6 base unit
(BU-F4BD81B)
3
1 gear (cap)
2 gear (BU lock)
4 three hooks
5 lever (BU lock)
3-17. BASE UNIT (BU-F4BD81B)
3-18. LEVER (BU LOCK)

17
CX-LDB30/LDB50
1 washer (3-1-0.4)
2 close lever sprin
g
3 claw
4 shaft disc stop
5 close lever
1 tension coil spring (DIR)
6 Loosen the screw.
7 Hold the release lever
and change the direction.
2 capstan retaining ring
3 gear pulley
4 gear (cap)
5 gear (IDL-A)
8 stopper
0 gear (IDL-B)
9 DIR lever
3-19. CLOSE LEVER
3-20. DIR LEVER, GEAR (IDL-B)

18
CX-LDB30/LDB50
3 gear (IDL-D)
2 two claws
1 gear (IDL-F)
7 gear (IDL-C)
6 claw
5 gear loading lever
4 three hooks
3-21. GEAR (IDL-C)

19
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 ?/1button to turn off the main power.
2. Press two buttons of [AUDIO IN] and ?/1simultaneously for
more than two seconds.
3. The fluorescent indicator tube does not display any message
and the set is reset.
[COMMONTEST]
*This mode is used to check the function of the amplifier.
Procedure:
1. Press the ?/1button to turn the set on.
2. Press two buttons of xand [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.
[PANELTEST]
*The panel test, the version, and inducing is displayed.
Procedure:
1. Press the ?/1button 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 5Times Limit Release Mode]
Procedure:
1. Press the ?/1button to turn the set on.
2. Select the FUNCTION to CD.
3. Press two buttons of ZCD 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.
[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 ?/1button to turn the set on.
2. Set the FUNCTION to CD.
3. Press two buttons of ZCD 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.
[Disc anti-theft]
Procedure:
1. Press the ?/1button to turn the set on.
2. Set the FUNCTION to CD.
3. Press two buttons of xand ZCD simultaneously for more
than five seconds.
4. Press two buttons of xand ZCD simultaneously for more
than five seconds to turn the set off.
[CD ERROR CODE]
Procedure:
1. Press the ?/1button to turn the set on.
2. Set the FUNCTION to CD.
3. Press two buttons of CD uand [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 ?/1button to turn the set on.
2. Set the FUNCTION to CD.
3. While depressing the CD ubutton, 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 ubutton, normal playback is
performed.
6. Each time the CD ubutton 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 ?/1button at the same time to
enter this mode.
SECTION 4
TEST MODE

20
CX-LDB30/LDB50
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)
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)
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
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 demag-
netizer.
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
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode : Playback
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.
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 R-
CH.
7. Switches and controls should be set as follows unless otherwise
specified.
• Test Tape
Signal Used forTape
P-4-A100
WS-48B
10 kHz, –10 dB
3 kHz, 0 dB
Azimuth Adjustment
Tape Speed Check
SECTION 5
MECHANICAL ADJUSTMENTS SECTION 6 ELECTRICAL ADJUSTMENTS
set
MAIN board
SPEAKER terminal (J201)
L-CH, R-CH
+
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak R-CH
peak
within
1dB
Screw
position
R-CH
peak