JVC RC-BX30 User manual

RC-BX30
No.21171
Dec. 2002
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
SERVICE MANUAL
Contents
Safety precautions
Preventing static electricity
Important for laser products
Disassembly method
Adjustment method
Trouble shooting
1-2
1-3
1-4
1-5
1-14
1-17
RC-BX30
Area suffix
UJ --------------------- U.S.Military
Flow of functional operation
until TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
Wiring connection
1-18
1-19
1-19
1-20
1-22
CD PORTABLE SYSTEM

RC-BX30
1-2
1. This design of this product contains special hardware and many circuits and components specially for safety
purposes. For continued protection, no changes should be made to the original design unless authorized in
writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services
should be performed by qualified personnel only.
2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product
should not be made. Any design alterations or additions will void the manufacturer`s warranty and will further
relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.
3. Many electrical and mechanical parts in the products have special safety-related characteristics. These
characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily
be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in the Parts List of Service Manual. Electrical
components having such features are identified by shading on the schematics and by ( ) on the Parts List in
the Service Manual. The use of a substitute replacement which does not have the same safety characteristics
as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or
other hazards.
4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be
separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of
electric shock and fire hazard. When service is required, the original lead routing and dress should be
observed, and it should be confirmed that they have been returned to normal, after re-assembling.
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling the product, always perform an isolation check on the exposed metal parts of the product
(antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the
product is safe to operate without danger of electrical shock.
Do not use a line isolation transformer during this check.
Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the leakage
current from each exposed metal parts of the cabinet, particularly any exposed metal part having a return
path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.).
Alternate check method
Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more
sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor
between an exposed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
Move the resistor connection to each exposed metal part,
particularly any exposed metal part having a return path to
the chassis, and meausre the AC voltage across the resistor.
Now, reverse the plug in the AC outlet and repeat each
measurement. Voltage measured any must not exceed 0.75 V
AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).
1. This equipment has been designed and manufactured to meet international safety standards.
2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
3. Repairs must be made in accordance with the relevant safety standards.
4. It is essential that safety critical components are replaced by approved parts.
5. If mains voltage selector is provided, check setting for local voltage.
Good earth ground
Place this
probe on
each exposed
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE
!
Burrs formed during molding may
be left over on some parts of the
chassis. Therefore, pay attention to
such burrs in the case of
preforming repair of this system.
In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the
parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the " "
mark nearby are critical for safety.
(This regulation does not correspond to J and C version.)

RC-BX30
1-3
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap
Short land
Fiexible wire
CD pickup unit
5. Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the CD pickup unit.
Apply solder to the short land before the flexible wire is removed
from the CD servo board.
(If the flexible wire is disconnected without applying solder, the CD
pickup unit may be destroyed by static electricity.)
In the assembly, be sure to remove solder from the short land after
connecting the fiexible wire.
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged,
can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
Preventing static electricity
1. Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players.
Be careful to use proper grounding in the area where repairs are being performed.
2. About the earth processing for the destruction prevention by static electricity
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it
before placing the traverse unit (optical pickup) on it.
2-1 Ground the workbench
2-2 Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
In order to maintain quality during transport and before installation, both sides of the laser diode on the
replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power
source can easily destroy the laser diode.
3. Handling the optical pickup
1.
2.
Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
Remove solder of the short land on the flexible wire after replacing the optical pickup. For specific details, refer
to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit.
Be careful not to take too long a time when attaching it to the connector.
Handle the flexible wire carefully as it may break when subjected to strong force.
It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
4. Handling the traverse unit (optical pickup)
1.
2.
3.
4.

RC-BX30
1-4
Important for laser products
1.CLASS 1 LASER PRODUCT
2.DANGER : Invisible laser radiation when open and inter
lock failed or defeated. Avoid direct exposure to beam.
3.CAUTION : There are no serviceable parts inside the
Laser Unit. Do not disassemble the Laser Unit. Replace
the complete Laser Unit if it malfunctions.
4.CAUTION : The compact disc player uses invisible
laserradiation and is equipped with safety switches
whichprevent emission of radiation when the drawer is
open and the safety interlocks have failed or are de
feated. It is dangerous to defeat the safety switches.
5.CAUTION : If safety switches malfunction, the laser is able
to function.
6.CAUTION : Use of controls, adjustments or performance of
procedures other than those specified herein may result in
hazardous radiation exposure.
VARNING : Osynlig laserstrålning när denna del är öppnad
och spårren är urkopplad. Betrakta ej strålen.
VARO : Avattaessa ja suojalukitus ohitettaessa olet
alttiina näkymättömälle lasersäteilylle.Älä katso
säteeseen.
ADVARSEL : Usynlig laserstråling ved åbning , når
sikkerhedsafbrydere er ude af funktion.
Undgåudsættelse for stråling.
ADVARSEL : Usynlig laserstråling ved åpning,når
sikkerhetsbryteren er avslott. unngå utsettelse
for stråling.
REPRODUCTION AND POSITION OF LABELS
CLASS 1
LASER PRODUCT
!
CAUTION
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.

RC-BX30
1-5
Fig.1
Fig.2
Fig.3Fig.4
Removing the front cabinet assembly
and rear cabinet assembly
(See Figs. 2 to 4.)
<Main body section>
Disassembly method
Removing the handle (See Fig. 1.)
1.
2.
3.
4.
5.
Remove the eight screws Aretaining the front
cabinet and rear cabinet assemblies from the rear
of the main body. (See Fig.2.)
Open the cassette door. (See Fig.3.)
Slide the lower part of the front cabinet assembly
slightly in the direction of the arrow 1. (See Fig.3.)
While removing the front cabinet assembly from the
cassette knobs and remove it in the upward
direction 2. (See Fig.3.)
Disconnect the speaker wire from the connector
CN401 on the main board. (See Fig.4.)
Open the CD door.
Lift the handle slightly.
While pressing the claws aof the rear cabinet
assembly in the direction of the arrow 1, slide the
handle in the direction of the arrow 2.
1.
2.
3.
CD door
Rear cabinet assembly
Handle
Claw a
Claw a
11
2
A A
AA
Rear cabinet assembly
Cassette knobs
Rear cabinet assembly
Front cabinet assembly
Rear cabinet assembly
Front cabinet assembly
Main board
CN401
2
1

RC-BX30
1-6
Fig.5
Fig.6
Fig.7
<Front cabinet assembly section>
Prior to performing the following procedures,
remove the front cabinet assembly from the rear
cabinet assembly.
Removing the right and left speaker
assemblies (See Fig. 5.)
1.
2.
3.
From the inside of the front cabinet assembly,
remove the six screws Bretaining the right and left
speaker assemblies.
Remove the solders from the soldered sections b
of the right and left speaker assemblies, remove
the speaker wires.
Take out the right and left speaker assemblies.
Removing the cassette door gear
assembly (See Fig. 6.)
1.
2.
From the inside of the front cabinet assembly,
remove the two screws Cretaining the cassette
door gear assembly.
Take out the cassette door gear assembly.
[Note] When attaching the screws C, apply a
locking agent to the screws C.
[Note] When attaching the screws B, apply a
locking agent to the screws B.
Removing the cassette door
(See Fig. 7.)
1.
2.
While pressing the section cof the cassette door in
the direction of the arrow, remove the boss dof the
cassette door from the section eof the front cabinet
assembly.
Disengage the boss fof the cassette door from the
section gof the front cabinet assembly.
Prior to performing the following procedures,
remove the cassette door gear assembly.
[Note] Be sure to hang the spring to the
section h before attaching the cassette
door to the front cabinet assembly.
B
B
B
Front cabinet assembly
Cassette door gear assembly
Cassette door
Section e
Section c
Boss dBoss f
Section g
Section h
Spring
Front cabinet assembly
Right speaker
assembly
Left speaker assembly
Soldered section b
Soldered section b
C
C
B
Speaker wires

RC-BX30
1-7
Fig.10
Fig.11
Fig.8
Fig.9
Removing the tuner board
(See Figs. 8 to 10.)
1.
2.
3.
4.
5.
From the rear side of the rear cabinet assembly,
remove the screw Dretaining the FM antenna.
(See Fig.8.)
Pull out the band and fine tune knobs from the
tuner board. (See Fig.9.)
Disconnect the wire from the connector CN101 on
the tuner board. (See Fig.9.)
Remove the screw Eand two screws Fretaining
the tuner board. (See Fig.9.)
Take out the tuner board, then remove the screw G
retaining the antenna connector plate. (See Fig.10.)
<Rear cabinet assembly section>
Prior to performing the following procedures,
remove the front cabinet assembly from the rear
cabinet assembly.
[Note] When attaching the screws G, apply a
locking agent to the screws G.
Removing the main board
(See Figs. 9 and 11.)
1.
2.
3.
4.
5.
Disconnect the wire from the connector CN101 on
the tuner board. (See Fig.9.)
Pull out the volume, DBB and function knobs from
the main board. (See Fig.11.)
Disconnect the wires from the connectors CN302,
CN303 and CN501 on the main board.
(See Fig.11.)
Remove the solders from the soldered section i
connecting the wires to the main board.
(See Fig.11.)
Remove the three screws Hretaining the main
board. (See Fig.11.)
D
G
H
H
F
F
Rear cabinet assembly
Rear cabinet
assembly
Rear cabinet
assembly
Rear cabinet
assembly
Main board
Volume knobDBB knob
CN302
CN303
CN501
Function knob
Soldered section i
FM antenna
Tuner board
Tuner board
Antenna connector plate
Fine tune knob
Band knob
CN101
FM antenna wire
FM antenna wire

RC-BX30
1-8
Fig.12
Fig.13
Fig.14Fig.15
Removing the cassette deck/CD
mechanism assembly
(See Figs.12 and 13.)
1.
2.
3.
From the rear side of the rear cabinet assembly,
remove the two screws Jretaining the cassette
deck/CD mechanism assembly. (See Fig.12.)
Disconnect the wires from the connectors CN302,
CN303 and CN501 on the main board.
(See Fig.13.)
Remove the two screws Kretaining the cassette
deck/CD mechanism assembly. (See Fig.13.)
[Note] When attaching the screws K, apply a
locking agent to the screws K.
Removing the display board
(See Figs.14 and 15.)
1.
2.
3.
4.
5.
From the bottom side of the CD mechanism
assembly, remove the tie bands bundling the wires
from the CD mechanism assembly. (See Fig.14.)
Disconnect the wires from the connectors BC01,
BC02 and BC03 on the CD servo board.
(See Fig.14.)
Remove the solders from the soldered section j
connecting the wires to the micro switch board.
(See Fig.14.)
Remove the two screws Lretaining the display
board. (See Fig.15.)
Press the claws kin the direction of the arrow,
remove the display board. (See Fig.15.)
J
Cassette deck/CD
mechanism assembly
Rear cabinet assembly
Rear cabinet assembly
BC01 BC02
BC03Tie bands
CD mechanism
assembly
Cassette desk
mechanism assembly
Tie band
Display board Claws k
CD servo board
Soldered
section j
Micro switch
board
CN302
CN303
CN501
Cassette deck/CD mechanism assembly
K
L

RC-BX30
1-9
Fig.16
Fig.17
Removing the cassette board
(See Fig. 16.)
1.
2.
3.
4.
From the back side of the cassette deck
mechanism assembly, remove the tie band
bundling the wires.
Remove the solders from the soldered section m
connecting the wires of the capstan motor and leaf
switch.
Remove the four screws Mretaining the cassette
board.
From the reverse side of the cassette board,
remove the solders from the soldered section n
connecting the wires of the REC/PB head.
Removing the cassette deck
mechanism assembly (See Fig. 17.)
1.
2.
3.
Remove the solders from the soldered section p
connecting the wires of the leaf switch.
Remove the solders from the soldered section q
connecting the wires of the REC/PB head.
Remove the two screws Nretaining the cassette
deck mechanism assembly.
Prior to performing the following procedures,
remove the display board.
[Note] When attaching the screws N, apply a
locking agent to the screws N.
M
N
M
Cassette board
Tie band
Soldered section m
Cassette deck
mechanism assembly
Cassette deck
mechanism assembly
Cassette board
Soldered section q
Soldered section p
Cassette board
Wires (REC/PB head)
Soldered section n
Cassette board
Wires
(Leaf switch)

RC-BX30
1-10
Fig.18
Fig.20
Fig.19
Removing the power transformer
(See Figs.18 to 20.)
1.
2.
3.
4.
5.
6.
7.
From the rear side of the rear cabinet assembly,
remove the battery door. (See Fig.18.)
Remove the two screws Pretaining the voltage
selector switch. (See Fig.18.)
From the inside of the rear cabinet assembly,
remove the three screws Qretaining the cassette
deck bracket. (See Fig.19.)
Remove the solders from the soldered section r
and sconnecting the wires(red and black).
(See Fig.19.)
Remove the two screws Rretaining the power
transformer. (See Fig.20.)
Remove the two screws Sretaining the socket
cover. (See Fig.20.)
Take out the power transformer together the socket
cover and voltage selector switch.
Prior to performing the following procedures,
remove the main board and cassette deck/CD
mechanism assembly.
[Note] When attaching the screws P and R,
apply a locking agent to the screws P
and R.
S
Rear cabinet assembly
Rear cabinet assembly
Battery door
Cassette deck bracket
Power transformer
Soldered
section r
Socket cover
Soldered section s
Voltage
selector
switch
Wire (black)
Wire (red)
Voltage selector
switch
P
P
R

RC-BX30
1-11
Fig.21
Fig.23
Fig.22
Removing the CD mechanism
assembly (See Fig. 21.)
1.
2.
From the bottom side of the cassette deck/CD
mechanism assembly, disconnect the wires from
the connectors BC01, BC02 and BC03 on the CD
servo board.
Remove the four screws Tretaining the CD
mechanism assembly.
Prior to performing the following procedures,
remove the cassette deck/CD mechanism
assembly. (See Figs.12 and 13.)
[Note] When replacing the CD mechanism
assembly, be sure not to mistake the
positions of the pink and orange
rubbers.
Removing the micro switch board
(See Fig. 22.)
1.
2.
From the bottom side of the cassette deck/CD
mechanism assembly, remove the solders from the
soldered section tconnecting the wires.
Remove the screw Uretaining the micro switch
board.
Removing the CD gear assembly
(See Fig. 23.)
1.
2.
From the bottom side of the cassette deck/CD
mechanism assembly, remove the two screws V
retaining the CD gear assembly.
Take out the CD gear assembly.
Removing the CD door (See Fig. 23.)
1.
2.
3.
Open the CD door.
While pressing the arm section uof the CD door in
the direction of the arrow, remove the arm section
u.
Disengage the arm section vof the CD door,
remove the CD door.
[Note] When attaching the CD door, hang the
spring to the section w of the CD door.
BC01 BC02
BC03 CD mechanism
assembly
Rubber (pink)
Rubber (pink)
Rubber (oranmge)
Cassette deck
mechanism assembly
Cassette deck/CD
mechanism assembly
Rubber (orange)
CD gear assembly
Soldered section t
CD door
Arm section vArm section u
Section w
Spring
Micro switch
board
TT
V
U

RC-BX30
1-12
Fig.1
Fig.2
Fig.3
Removing the CD pickup unit
(See Figs. 1 to 3.)
1.
2.
3.
4.
Remove the three screws Aretaining the CD
pickup cover. (See Fig.1.)
Remove the slit washer retaining the feed middle
gear and take out the feed middle gear. (See Fig.2.)
Loosen the two screws Bretaining the shaft and
pull out the shaft in the direction of the arrow.
(See Fig.2.)
Take out the CD pickup unit.
<CD mechanism assembly section>
[Note] In the assembly, be sure to attach the
sliding spring in the correct orientation
before attaching the CD pickup unit.
(See Fig.2.)
Prior to performing the following procedures,
remove the CD mechanism assembly.
[Caution] Be sure to apply the solder in order
to the short land section a on the CD
pickup unit before removing the
flexible wire from the CD pickup unit.
(See Fig.2.)
If the flexible wire is disconnected
without apply this solder, the CD
pickup may be damaged.
5.From the bottom side of the CD mechanism
assembly, remove the solders of the flexible wire
from the soldered section bon the CD servo board.
[Caution] After re-connecting the flexible wire,
be sure to remove the solder from the
short land section a.
CD servo board
Soldered section b
CD mechanism assembly
Pickup cover
Short land section a
Sliding spring
CD pickup unit
CD pickup unit
Shaft
Slit washer
Feed middle gear
A
A
B
B
A

RC-BX30
1-13
1
2
Fig.3
Fig.4
Cassette deck mechanism assembly
Flywheel assembly
Capstan motor
Capstan motor
belt
Fig.2
B
Capstan motor
Bracket
A
Fig.5
Cassette deck
mechanism assembly Flywheel assembly
Shaft Slit washer
Flywheel assembly
Main belt
Pinch roller
arm
assembly
REC/PB head
Erase head Washer Spring
Notch b
C
FE
D
Fig.1
Claw a
Leaf switch
Main belt
Removing the capstan motor
(See Figs.1 and 2.)
1.
2.
3.
Remove the capstan motor belt.
Remove the two screws Aretaining the bracket of
the capstan motor from the cassette deck
mechanism assembly.
Remove the two screws Bretaining the bracket
from the capstan motor. (See Fig.2.)
Prior to performing the following procedures,
remove the cassette deck mechanism assembly
from the rear cabinet assembly.
(See Fig.17 of "Rear cabinet section" on page 1-9.)
[Note] In the assembly, hang the notch b of the
pinch roller arm assembly to the spring.
1.
2.
3.
From the bottom side of the cassette deck
mechanism assembly, remove the main belt.
From the top side of the cassette mechanism
assembly, remove the slit washer retaining the
shaft of the flywheel assembly.
Pull out the flywheel assembly in the direction of
the arrow. (See Fig.5.)
Removing the flywheel assembly
(See Figs. 4 and 5.)
<Cassette deck mechanism
assembly section>
Removing the leaf switch (See Fig.3.)
Pressing the claw aof the leaf switch in the
direction of the arrow 1and take out the leaf switch
in the direction of the arrow 2.
Removing the pinch roller arm
assembly (See Fig.4.)
Remove the screw Cretaining the pinch roller arm
assembly and remove the pinch roller arm
assembly in an upward direction.
Removing the erase head
(See Fig.4.)
Remove the screw Dretaining the erase head and
remove the erase head in an upward direction.
Removing the REC/PB head
(See Fig.4.)
Remove the screw E, washer and screw Fretaining
the REC/PB head and remove the REC/PB head.
[Notes] When removing or replacing the
REC/PB head, perform the REC/PB head
adjustment. (See "Adjustment method".)
After adjusting the REC/PB head, apply
a locking agent to the screws E and F.

RC-BX30
1-14
Adjustment method
Measuring instructions required for
adjustment
1. AM signal generator
2. FM signal generator
3. Inter mediate frequency sweep generator
4. FM stereo signal generator
5. Low-frequency oscillator
(oscillation frequency 50Hz-20kHz, 0dB output
with 600 ohm impedance)
6. Attenuator (600 ohm impedance)
7. Electronic voltmeter
8. Distortion meter
9. Torque gauge (cassette for CTG-N)
10. Wow & flutter meter
11. Frequency counter meter
12. Test tape
VT712 : For tape speed and wow flutter
VT724 : For reference level
VT702 : For playback frequency
VT702 : For head azimuth adjustment
13. Blank tape
TAPE : AC-225
Measurement conditions
Power supply voltage
AC110V-127V/210V-230V (60Hz/50Hz)
Measuring instruments
Radio section
FM 1kHz, 22.5kHz deviation
FM STEREO : 1kHz, 67.5kHz deviation
pilot signal 7.5kHz
AM : 1kHz, 30% modulation
Reference output :
Speaker output 0dBs (0.447V)/4 ohm
H.phone output -10dBs (0.245V)/32 ohm
Standard position of function switch :
Selects FM in tuner mode
Bass boost: OFF
Main volume: Reference output
Amplifier section
Reference output :
Speaker output 0dBs (0.447V)/4 ohm
H.phone output -10dBs (0.245V)/32 ohm
Standard position of function switch :
Selects TAPE mode
CD section
CD test disc : CTS-1000

RC-BX30
1-15
Cassette amplifier section
Item Measuring condition Check and adjustment procedure Standard value Adjusting part
Play back the test tape VT702 (8kHz).
Adjust the head azimuth adjusting screw so that the
phase difference between the R and L channels is
minimized at an output level that is within (+2dB-2dB)
of the maximum output level in the FWD and REV
operations. After this adjustment, lock the head
azimuth adjusting screw with screw sealant to cover
more than a half of the screw head.
When the head azimuth is maladjusted, correct it with
the head azimuth adjusting screw in the FWD and
REV operations alternately.
Play back the test tape VT712 (3kHz) by the end
portion.
Connect a frequency counter and check that it reads
between 2940 and 3090Hz. If not, adjust the
frequency with the motor semifixed resistor.
Check that the wow/flutter is within 0.38%
(unweighted).
Play back the test tape VT702 while con-firming that
deviation between the 1kHz signal and 8kHz signal
should be 0(+3dB~-6)dB.
Set the FUNCTION switch to TAPE and the record
and play tape mechanism, check to see if the
frequency at the measuring point is (80kHz+2kHz
-2kHz) if not adjust L201 until the frequency counter
indicates (80kHz+2kHz-2kHz).
Set the FUNCTION switch to the radio position, set
the BAND switch to the FM position, and record the
reference 1kHz signal and 8kHz signal alternately
repeatedly. While playing back the recorded signal
differ from that of the 1kHz signal by within 0 (+3~
-6)dB.
Test tape:
VT702 (8kHz)
Signal output terminal:
PHONES
(with 32 ohm load)
Test tape:
VT712 (3kHz)
Signal output terminal:
PHONES
(with 32 ohm load)
Test tape: VT702
Signal output terminal:
PHONES
(with 32 ohm load)
Tape: Normal
Signal output terminal:
Cassette REC./PLAY
HEAD
Test tape: AC225
Signal input:
FM22.5 DEV 60dBu
with emphasis
Signal output terminal:
PHONES
(with 32 ohm load)
Head azimuth
adjustment
Tape speed and
wow/flutter check
and adjustment
PB frequency
response check
Bias frequency
check
REC and PB
frequency
response
adjustment
1.
2.
3.
1.
2.
3.
Output level:
Within (+2dB-2dB) of
maximum output
level
Phase difference R
and L channels:
Minimum
2940 to 3090Hz
Within 0.38%
(unweighted)
Deviation between
1kHz and 8kHz:
0(+3dB~-6)dB
Level difference
between REC and
PB: Within
0 (+3~-6)dB
Head azimuth
adjusting screw
(To be used only
after head
replacement)
See Fig.1 on
page 1-16.
Tape speed:
Motor semifixed
resistor
See Fig.2 on
page 1-16.
Check only
L201
See Fig.4 on
page 1-16.
Tuner section
Item Measuring condition Check and adjustment procedure Standard value Adjusting part
Set the intermediate frequency sweep generator to
MW/SW 455kHz.
Adjust the T102 for maximum and center output.
Set the intermediate frequency sweep generator to
FM (10.7MHz).
Adjust the T101, T103 for maximum and center
output.
Set the dial at low end, set the S/G at (5.75MHz
+0.4MHz-0.4MHz). Adjust the L104, check to see the
output is maximum.
Set the dial at high end, set the S/G at (17.8MHz
+0.5MHz-0.5MHz). Adjust the VC101, check to see
the output is maximum.
Set the dial while receiving a 7MHz signal from S/G at
maximum. Adjust the L101, check to see the output is
maximum.
Signal input:
Loop ANTENNA
Signal output:
IC101 pin19
Signal input:
FMANT, FMGND
Signal output:
IC101 pin19
Signal input:
Dummy antenna
ANT
GND
Signal output:
PHONES
(with 32 ohm load)
MW/SW
IF adjustment
FM IF adjustment
SW tracking
adjustment
1.
2.
1.
2.
1.
2.
3.
T102
See Fig.3 on
page 1-16.
T101, T103
See Fig.3 on
page 1-16.
L104
VC101
L101
See Fig.3 on
page 1-16.

RC-BX30
1-16
Fig.1 Head output signal
Adjustment
Head
max
Azimuth adjustment screw
CASSETTE MOTOR
Tape Speed Adj.
Location of adjusting parts
Cassette mechanism section
Fig.2
(Caution) For adjusting any head, be sure to use a screw driver degaussed.
Tuner board
Tuner section
Item Measuring condition Check and adjustment procedure Standard value Adjusting part
Set the dial at low end, set the FM signal generator at
(87.35MHz+0.2MHz-0.2MHz). Adjust the L107, check
to see the output is maximum.
Set the dial at high end, set the FM signal generator
at (108.25MHz+0.25MHz-0.25MHz). Adjust the
PVC11-C2, check to see the output is maximum.
Set the dial while receiving a 90MHz signal from an
FM signal generator at maximum. Adjust the L106 for
maximum output.
Set the dial while receiving a 106MHz signal from an
FM signal generator at maximum. Adjust the PVC11
-C1 for maximum output.
Repeat the adjustment of the above steps 3 and 4.
Set the dial at low end, set the S/G at (515kHz+5kHz
-5kz). Adjust the L105, check to see the output is
maximum.
Set the dial at high end, set the S/G at (1620kHz
+15kHz-15kHz). Adjust the PVC11-C4, check to see
the output is maximum.
Set the dial while receiving a 600kHz signal from an
AM signal generator at maximum. Adjust the AM ANT
COIL L102 for maximum output.
Set the dial while receiving a 1400kHz signal from an
AM signal generator at maximum. Adjust the PVC11
-C3 for maximum output.
Repeat the adjustment of the above steps 3 and 4.
Signal input:
Dummy antenna
ANT
GND
Signal output:
PHONES
(with 32 ohm load)
Signal input:
Loop antenna
Signal output:
PHONES
(with 32 ohm load)
FM tracking
adjustment
MW tracking
adjustment
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
L107
PVC11-C2
L106
PVC11-C1
See Fig.3 on
page 1-16.
L105
PVC11-C4
L102
PVC11-C3
See Fig.3 on
page 1-16.
L201
(Bias Frequency Adj.)
I
IC C1 10 01 1
Cassette board
Fig.3 Fig.4

RC-BX30
1-17
Trouble shooting
Circuit Symptom Cause
Speakers are not connected.
Wrong function is selected.
Defective volume control
Defective earphone jack
Improper location of unit
Defect in IFT102
Defect MW antenna coil L102 or
oscilloscope coil L105
Intermediate frequency tuning faulty
MW tracking faulty
Defective IC101
Defective Q101, Q102, Q103, Q104, Q105
SW antenna not connected
Defect in IFT102
Defect SW antenna coil or oscilloscope coil
Intermediate frequency tuning faulty
SW tracking faulty
Defective IC101
Defective Q101, Q102, Q103, Q104, Q105
FM antenna not connected
Defective band selector switch
Defective IC101
Intermediate frequency tuning faulty
Poor contact in FM antenna circuit
Dirty capstan or head
Irregular cassette tape winding
Defective IC201
Cassette erasure prevention tabs broken out
Disc is inserted upside down.
Disc is dirty.
Disc is scratched.
Disc is seriously warped.
A non-standard disc has been inserted.
Moisture has formed inside the CD deck.
Defect in the servo control board
Defect in the CD pickup mechanism
No sound
No sound, weak
sound
(Low sensitivity)
No sound, weak
sound
(Low sensitivity)
No sound, weak
sound
(Low sensitivity)
No sound/recording,
unsteady tape sound,
weak sound
Cannot read the table
of content.
No display, no sound
General
MW
SW
FM
Tape
CD
Remedy
Check the speaker connection
Set switch to the proper position.
Set the volume control to a proper sound
level.
Replace the earphone jack.
Rotate or reposition the unit.
Check resistance, voltage and current.
Replace as needed.
Replace if necessary.
Readjust (see "Adjustment method").
Readjust (see "Adjustment method").
Check voltages. Replace if necessary.
Check voltages. Replace if necessary.
Connect the built-in external antenna
Check resistance, voltage and current.
Replace as needed.
Replace if necessary.
Readjust (see "Adjustment method").
Readjust (see "Adjustment method").
Check voltages. Replace if necessary.
Check voltages. Replace if necessary.
Connect the built-in external antenna
Replace or repair the switch
Check voltages. Replace if necessary.
Readjust (see "Adjustment method").
Resolder or repair as required.
Clean the capstan or head with alcohol.
Replace tape.
Check voltages. Replace if necessary.
Replace tape or cover tab openings with
adhesive tape.
Insert disc correctly.
Wipe clean with a soft cloth.
Use a new disc.
Use a new disc.
Use only a brand name disc.
Wait about 20 to 30 minutes.
Replace or repair as required.
Replace as required.

RC-BX30
1-18
Flow of functional operation until TOC read
Power ON Slider turns REST
SW ON.
Laser ON
Focus start
FOK
PLL Lock
Turn on radial
servo
Read TOC
Turn on focus
servo
Disc spinning
Radial_error
scaling

RC-BX30
1-19
Turn off the power switch and,disconnect the
power cord from the AC OUTLET.
Replace the pickup with a normal one.(Refer
to "Removing the CD pickup" on the previous page)
Plug the power cord in,and turn the power on.
At this time,check that the laser emits for
about 3 seconds and the objective lens moves
up and down.
Note: Do not observe the laser beam directly.
Play a disc.
Check the eye-pattern at the "RF" test point.
Finish.
Maintenance of laser pickup
(1) Cleaning the pick up lens
Before you replace the pick up, please try to
clean the lens with a alcohol soaked cotton
swab.
(2) Life of the laser diode
When the life of the laser diode has expired,
the following symptoms will appear.
The level of RF output (EFM output:ampli-
tude of eye pattern) will below.
Is the level of
RF OUT under
1.25V 0.22Vp-p? Replace it.
NO
YES
O.K
(3) Semi-fixed resistor on the APC PC board
The semi-fixed resistor on the APC printed circuit board which is attached to the pickup is used to adjust the laser
power.
Since this adjustment should be performed to match the characteristics of the whole optical block, do not touch the
semi-fixed resistor.
If the laser power is lower than the specified value,the laser diode is almost worn out, and the laser pickup should
be replaced.
If the semi-fixed resistor would be adjusted when the pickup operates normally,the laser pickup may be damaged
due to excessive current.
Replacement of laser pickup

RC-BX30
1-20
AN7312 (IC201) : Dual recording/Playback pre-amplifier circuit with ALC
1. Terminal layout
3. Pin function
2. Block diagram
1
2
3
4
5
6
7
8
9
10
11
12
13
14
GND
ALC time constant
ALC input Ch.1
Output Ch.1
Phase compensation Ch.1
N.E.B. Ch.1
Input Ch.1
Input Ch.2
N.E.B. Ch.2
Phase compensation Ch.2
Output Ch.2
ALC input Ch.2
Ripple filter
Vcc
GND
ALC time constant by resistance and capacitor
Right channel ALC input
Right channel output
Not connect
Right channel negative feed back input
Right channel signal input
Left channel signal input
Left channel negative feed back input
Not connect
Left channel output
Left channel ALC input
Ripple filter
Power supply
Pin No. Symbol Function
-
-
I
O
-
I
I
I
I
-
O
I
-
-
I/O
14 13 12 11 10 9
1 2 3 4 5 6
Ripple Filter Amp.
Ch2
8
ALC
7
GND
Vcc
Amp.
Ch1
FM
RF
FM
MIX
FM
OSC
1
DECODER PHASE
COMP DET
CND2
AM
MIX
AM
OSC
AM
RF REG GND1 ST
LED AM-IF
AGCDET
S-METER
TRIG ST-SW VCO FF FF FF
PILOT
Vcc2
2 3 4 5 6 7 8 9 10 11 12
24 23 22 21 20 19 18 17 16 15 14 13
FM-IF
TUN
LED
Vcc1
LA1824 (IC101) : Tuner
1. Terminal layout & Block diagram
Description of major ICs
1
2
3
4
5
6
7
14
13
12
11
10
9
8