JVC RC-BM5 User manual

RC-BM5
No.21129
Oct. 2002
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
SERVICE MANUAL
Contents
Safety precautions
Preventing static electricity
Important for laser products
Importance administering point
on the safety
Disassembly method
Adjustment method
1-2
1-3
1-4
1-5
1-6
1-16
RC-BM5
Area suffix
J ----------------------------- U.S.A.
C -------------------------- Canada
Trouble shooting
Flow of functional operation
until TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
Wiring connection
1-19
1-20
1-21
1-21
1-22
1-37
CD PORTABLE SYSTEM
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RC-BM5
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-BM5
1-3
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap
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 card wire is disconnected
from the connector on the main board.
(If the flexible wire is disconnected without applying solder, the CD
pickup may be destroyed by static electricity.)
In the assembly, be sure to remove solder from the short land after
connecting the card 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.
CD/Cassette mechanism
assembly CD pickup unit
Card wire
Short land Main board

RC-BM5
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-BM5
1-5
Importance administering point on the safety
Precaution: Pour eviter les risques de feu, remplacez le
fusible de surete par le meme type: 2,5A/250V pour
F201.
Ce symbole specifie le type du fusible a fonctionnement
rapide.
Caution: For continued protection against risk of fire,
replace only with same type: 2.5A/250V for F201.
This symbol specifies type of fast operating fuse.
Power amplifier board
F201
CN204
CN206
CN203

RC-BM5
1-6
1
2
1
1
2
Fig.4
Fig.1
Claw aClaw a
Handle
Rear cabinet assembly
Fig.2
AA
AA
Rear cabinet assembly
B
Front cabinet assembly Cassette door
Fig.3
Front cabinet assembly Cassette knobs
Fig.5
Phone jack board
CN205
CN302
Main board
Removing the front cabinet assembly
and rear cabinet assembly
(See Figs. 2 to 5.)
<Main body section>
Disassembly method
Removing the handle (See Fig. 1.)
1.
2.
3.
4.
5.
6.
7.
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.)
Remove the two screws Bretaining the front
cabinet assembly. (See Fig.3.)
Slide the lower part of the front cabinet slightly in
the direction of the arrow 1. (See Fig.4.)
While removing the front cabinet assembly from the
cassette knobs and remove it in the upward
direction 2. (See Fig.4.)
Disconnect the speaker wire from the connector
CN205 on the phone jack board. (See Fig.5.)
Disconnect the parallel wire from the connector
CN302 on the main board. (See Fig.5.)
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.

RC-BM5
1-7
Fig.6
Display board
Front cabinet assembly
C
C
CC
Fig.7
Front cabinet
assembly
Soldered sections d
Soldered
section b
Soldered sections e
Soldered
section c
Right main
speaker
Right sub speaker
Left main
speaker
Left sub speaker
DD
DD
EE
EE
Fig.8
Front cabinet assembly
Cassette door damper Bracket
F
F
Removing the display board
(See Fig. 6.)
From the inside of the front cabinet assembly,
remove the eight screws C retaining the display
board and then take out the display board.
<Front cabinet section>
Prior to performing the following procedures,
remove the front cabinet assembly from the rear
cabinet assembly.
Removing the right and left main
speaker assemblies (See Fig. 7.)
1.
2.
3.
From the inside of the front cabinet assembly,
remove the six screws Dretaining the right and left
main speaker assemblies.
Remove the solders from the soldered sections b
and cof the right and left main speaker
assemblies, remove the wires.
Take out the right and left main speaker
assemblies.
Removing the right and left sub
speaker assemblies (See Fig. 7.)
1.
2.
3.
From the inside of the front cabinet assembly,
remove the four screws Eretaining the right and
left sub speaker assemblies.
Remove the solders from the soldered sections d
and eof the right and left sub speaker assemblies,
remove the wires.
Take out the right and left sub speaker assemblies.
Removing the cassette door damper
(See Fig. 8.)
1.
2.
From the inside of the front cabinet assembly,
remove the two screws Fretaining the bracket of
the cassette door damper.
Take out the cassette door damper.
[Note] After assembly, apply a locking agent to
the screws F.
[Note] After assembly, apply a locking agent to
the screws D.
[Note] After assembly, apply a locking agent to
the screws E.

RC-BM5
1-8
Fig.10
Fig.9
Cassette door
Hook h
Hook g
Claw f
Boss j
Section i
Boss j
Boss m
Section n
Boss p
Spring
Fig.11
Section i
11
2
Section k
Section q
Cassette door bracket
Cassette door bracket
Cassette door bracket
Removing the cassette door
(See Fig. 9.)
1.
2.
3.
Open the cassette.
While pressing the claws fon the left and right of
the cassette door bracket, slide the cassette door.
Disengage the hooks gand hon the left and right
of the cassette door bracket, and remove the
cassette door.
Removing the cassette door bracket
(See Figs. 10 and 11.)
1.
2.
3.
While pressing the sections ion the left and right of
the cassette door bracket in the direction of the
arrow 1, remove the cassette door bracket from the
bosses jof the front cabinet assembly and then
open the cassette door bracket in the direction of
the arrow 2.
Press the section kof the cassette door bracket
and remove the cassette door bracket from the
boss mof the front cabinet assembly.
Disengage the section nof the cassette door
bracket from the boss pof the front cabinet
assembly and remove the cassette door bracket.
[Note] Be sure to hang the spring to the
section q before attaching the cassette
door bracket.

RC-BM5
1-9
Fig.14
Fig.15
Fig.12
GG
G
Volume switch board
Control bracket H402
H
Volume switch
board
Fig.13
L
K
K
Board holder (A)
Notch s
Notch t
Phone jack
board
Soldered section rCN206 Main board
Power amplifier board
CN801
H
M
N
Soldered section u
Soldered section v
Wire(blue) Power transformer
Wire(black)
AC jack Tie band
Control bracket
Board holder (B)
J
Volume switch
H
(Bottom side)
Removing the volume switch board
(See Fig. 12 and 13.)
1.
2.
3.
4.
5.
Disconnect the wire from the connector H402 on
the volume switch board.
Remove the four screws Gretaining the control
bracket of the volume switch board.
While pressing the power and volume buttons of
the volume switch board, take out the volume
switch board.
From the forward side of the volume switch board,
remove the five screws Hretaining the volume
switch board to the control bracket. (See Fig.13.)
From the bottom side of the control bracket,
remove the two screws Jretaining the volume
switch board and volume button to the control
bracket. (See Fig.13.)
<Rear cabinet section>
Prior to performing the following procedures,
remove the front cabinet assembly from the rear
cabinet assembly.
Removing the power amplifier board
and phone jack board (See Fig. 14.)
1.
2.
3.
4.
5.
6.
Disconnect the wire from the connector CN206 on
the power amplifier board.
Disconnect the wire from the connector CN801 on
the main board.
Remove the wire from the soldered section ron the
power amplifier board.
Remove the two screws Kand board holders
(A)/(B) retaining the power amplifier board.
Remove the two screws Lretaining the phone jack
board.
Pull out the power amplifier board from notches s
and t, and then take out the power amplifier board
together the phone jack board.
Removing the power transformer
(See Fig. 15.)
1.
2.
Remove the tie band bundling the wires from the
power transformer and battery plate.
Remove the wire from the soldered section uon
the power amplifier board.
[Reference] It is not necessary to remove the
wire(black) from the battery plate.
3.
4.
5.
6.
Remove the wire(blue) from the soldered section v
of the battery plate.
Remove the two screws Mretaining the power
transformer.
Remove the two screws Nretaining the AC jack.
Take out the power transformer together the AC
jack.
[Note] After assembly, apply a locking agent to
the screws M.

RC-BM5
1-10
P
Board holder (B)
H801
Notch w
Notch x
Fig.16
Fig.17
Cassette deck mechanism assembly Wire clamp
Q'
QQ Fig.18
Fig.19
Cassette deck mechanism
assembly
R
R
R
Soldered section z
Soldered section aa
Cassette board
H602 (Forward side)
CN602 (Forward side)
Tuner board
(Reverse side)
Soldered section y
Tuner board
Board holder (B)
Removing the tuner board
(See Figs. 16 and 17.)
1.
2.
3.
4.
Remove the wire from the connector H801 on the
tuner board.
Remove the two screws Pand board holders (B)
retaining the tuner board.
Pull out the tuner board from the notches wand x
of the rear cabinet assembly.
Remove the FM antenna wire from the soldered
section yon the reverse side of the tuner board.
(See Fig.17.)
Removing the cassette deck
mechanism assembly and cassette
board (See Figs. 18 and 19.)
1.
2.
3.
4.
5.
6.
Remove the three screws Qand screw Q' retaining
the cassette deck mechanism assembly.
Lift the cassette deck mechanism assembly slightly
and move it as shown in Fig.19.
Remove the three screws Rretaining the cassette
board.
Lift the cassette board slightly, remove the capstan
motor wire and REC/PB head wire from the
soldered sections zand aa on the cassette board.
From the forward side of the cassette board,
disconnect the wire from the connector CN602 and
then remove the cassette deck mechanism
assembly.
From the forward side of the cassette board,
disconnect the wire from the connector H602 and
then remove the cassette board.
[Notes] When attaching the screw Q', attach the
wire at the same time.
After assembly, apply a locking agent to
the screws Q and Q'.

RC-BM5
1-11
Fig.20 S
Rear cabinet
assembly
Fig.22
CD/Cassette mechanism
assembly
Rear cabinet assembly
Fig.21
TT
CD/Cassette mechanism assembly
Removing the CD/Cassette mechanism
assembly
(See Figs. 12,14,16 and 20 to 22.)
1.
2.
3.
4.
5.
6.
7.
From the back side of the rear cabinet assembly,
remove the two screws Sretaining the
CD/Cassette mechanism assembly. (See Fig.12.)
Disconnect the wire from the connector H402 on
the volume switch board. (See Fig.12.)
Disconnect the wire from the connector CN206 on
the power amplifier board. (See Fig.14.)
Disconnect the wire from the connector CN801 on
the main board. (See Fig.14.)
Disconnect the wire from the connector H801 on
the tuner board. (See Fig.16.)
Remove the four screws Tretaining the
CD/Cassette mechanism assembly. (See Fig.21.)
Slide the CD/Cassette mechanism assembly in the
direction of the arrow and take out it. (See Fig.22.)
[Reference] It is not necessary to remove the
cassette deck mechanism assembly
from the rear cabinet assembly.

RC-BM5
1-12
Fig.23
Fig.24
U
CD/Cassette
mechanism assembly
H602Cassette board
Main board
Fig.25
CD/Cassette mechanism
assembly CD pickup unit
Card wire
Short land section ab
CD/Cassette
mechanism assembly
H302
Main board
Wire clamp
V
VV'
H502
Removing the main board
(See Figs. 23 to 25.)
1.
2.
3.
4.
From the bottom side of the CD/Cassette
mechanism assembly, remove the screw U
retaining the main board.
Disconnect the wire from the connector H602 on
the cassette board. (See Fig.23.)
Disconnect the wire from the connector H302 on
the main board. (See Fig.24.)
From the top side of the CD/Cassette mechanism
assembly, remove the three screws Vand screw V'
retaining the main board. (See Fig.24.)
[Caution] When removing the main board, be
careful not to scratch or damage the
CD door.
<CD/Cassette mechanism section>
[Caution] Be sure to solder the short land
section ab on the CD pickup unit
before disconnecting the card wire
from the CD pickup unit.
If the card wire is disconnected
without applying solder, the CD
pickup may be destroyed by static
electricity.
8.After soldering, disconnect the card wire from the
CD pickup unit and then remove the main board.
(See Fig.25.)
[Caution] In the assembly, be sure to remove
solder from the short land section ab
on the CD pickup unit after
connecting the card wire.
5.
6.
7.
Remove the main board from the CD/Cassette
mechanism assembly, lift the CD/Cassette
mechanism assembly as shown in Fig.25.
Disconnect the wire from the connector H502 on
the main board. (See Fig.25.)
Apply solder to the short land section ab on the CD
pickup unit. (See Fig.25.)
[Note] When attaching the screw V', attach the
wire at the same time.

RC-BM5
1-13
Fig.26
1
22
3
3
Fig.28
Arm af
Arm ae
CD door
Section ag
Spring
Cassette mechanism assembly
Rubber (Orange)
CD tray assembly
CD mechanism assembly
W
W
Fig.27
CD door damper
CD door switch
board
Hanger
CD door damper holder
X
Y(To be loosened)
Z
Claw ad
Claw ad
Claws ac
Spring plate
Rubber (Orange) Rubber (Pink)
Rubber (Pink)
Removing the CD mechanism
assembly (See Fig. 26.)
From the bottom side of the CD/Cassette
mechanism assembly, remove the screw X
retaining the CD door switch board.
[Note] When attaching the CD mechanism
assembly, be sure not to mistake the
positions of the pink and orange rubbers.
1.
2.
3.
From the bottom side of the CD/Cassette
mechanism assembly, loosen the screw Yof the
spring plate holding the hanger and then move the
spring plate in the direction of the arrow 1.
While pressing the claws ac of the hanger in the
direction of the arrow 2, remove the hanger from
the CD tray assembly.
Press the claws ad of the CD open knob in the
direction of the arrow 3and then take out the CD
open knob from the top side of the CD tray
assembly.
Prior to performing the following procedures,
remove the main board from the CD/Cassette
mechanism assembly.
From the bottom side of the CD/Cassette
mechanism assembly, remove the four screws W
retaining the CD mechanism assembly.
Removing the CD door switch board
(See Fig. 27.)
Removing the hanger and CD door
button (See Fig. 27.)
[Note] After assembly, apply a locking agent to
the screw Y.
1.
2.
From the bottom side of the CD/Cassette
mechanism assembly, remove the two screws Z
retaining the CD door damper holder.
Take out the CD door damper.
Removing the CD door damper
(See Fig. 27.)
[Note] After assembly, apply a locking agent to
the screws Z.
1.
2.
3.
Open the CD door.
While pressing the arm section ae of the CD door
in the direction of the arrow, remove the arm
section.
While pressing the arm section af of the CD door in
the direction of the arrow, remove the CD door.
Removing the CD door (See Fig. 28.)
[Note] When attaching the CD door, hang the
spring to the section ag of the CD door.

RC-BM5
1-14
CD pickup cover
CD mechanism assembly
A
A
A
Fig.1
CD pickup unit
CD pickup unit
B
B
Shaft
Sliding Spring
Slit washer
Feed middle gear
Fig.2
Removing the CD pickup unit
(See Figs. 1 to 2.)
1.
2.
3.
4.
Remove the three screws Aretaining the CD
pickup cover.
Remove the slit washer retaining the feed middle
gear and take out the feed middle gear.
Loosen the two screws Bretaining the shaft and
pull out the shaft in the direction of the arrow.
Take out the CD pickup unit.
<CD mechanism 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.

RC-BM5
1-15
1
2
Fig.3
Fig.4
Cassette mechanism assembly
Flywheel assembly
Capstan motor
Capstan motor
belt
Fig.2
B
Capstan motor
Bracket
A
Fig.5
Cassette 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
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 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 mechanism assembly from
the rear cabinet assembly.
(See Fig.17 and 18 of "Rear cabinet section" on
page 1-10.)
[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 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 mechanism 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 F.

RC-BM5
1-16
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
AC120V/60Hz
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 0.5W(1.2V) 3.2 ohm
Standard mode of function knob :
Selects FM or AM in tuner mode
Bass boost: OFF
Preset EQ: Flat
Main volume: Reference output
Cassette amplifier section
Reference output :
Speaker output 0.5W(1.2V) 3.2 ohm
Standard mode of function knob :
Press TAPE knob of select TAPE mode
CD section
CD test disc : CTS-1000

RC-BM5
1-17
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-6dB).
While recording, check to see if the frequency at the
measuring point is (75+2kHz-2kHz) if not adjust T605
until the frequency counter indicates (75+2kHz-2kHz).
In recording FM mode, and record the reference 1kHz
signal and 8kHz signal alternately repeatedly. While
playing back the recorded signal of the 1kHz signal
differ from that of the 8kHz signal by within (0+4dB-
4dB).
Test tape:
VT702 (8kHz)
Signal output terminal:
Speakers
Test tape:
VT712 (3kHz)
Signal output terminal:
Speakers
Test tape: VT702
Signal output terminal:
Speakers
Tape: Normal
Signal output terminal:
Cassette REC./PLAY
HEAD
Test tape: AC225
Signal input:
SG 1kHz -20dBs
with emphasis
Signal output terminal:
Speakers
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-6dB)
Level difference for
1kHz singnal: Within
(0+4dB-4dB)
Head azimuth
adjusting screw
(To be used only
after head
replacement)
See Fig.1 on
page 1-18.
Tape speed:
Motor semifixed
resistor
See Fig.2 on
page 1-18.
Check only
T605
See Fig.3 on
page 1-18.
Tuner section
Item Measuring condition Check and adjustment procedure Standard value Adjusting part
Set the FM signal generator at 108MHz and output
level at 60dBu.
Adjust L102, so that the VT is within (8+0.2V-0.2V).
Set the AM signal generator at 1710kHz and output
level at 100dBu.
Adjust T102, so that the VT is within (8V+0.1V-0.1V).
Set the FM signal generator at 10.7MHz with no
signal deviation and output level at 90dBu.
Short IC101 pin21 to GND.
Adjust T103 so that the voltage between IC101 pin19
and pin20 is within (0+3mV-3mV).
Set the intermediate frequency sweep generator to
AM 450kHz.
Adjust T104 and T105 for maximum and center
output.
Adjust T106 so that the voltage between IC101 pin19
and pin20 is within (0+2mV-2mV).
Signal input:
FM antenna
VT test point:
IC101 pin8
Signal input:
AM loop antenna
VT test point:
IC101 pin8
Signal input:
IC101 pin3
Voltage test point:
IC101 pin19 and pin20
Signal input:
IC101 pin2
Signal output:
IC101 pin10
FM VT
adjustment
AM VT
adjustment
FM IF adjustment
AM IF adjustment
1.
2.
1.
2.
1.
2.
3.
1.
2.
3.
L102
See Fig.4 on
page 1-18.
T102
See Fig.4 on
page 1-18.
T103
See Fig.4 on
page 1-18.
T104
T105
T106
See Fig.4 on
page 1-18.
VT=8+0.2V-0.2V
VT=8+0.1V-0.1V
0+3mV-3mV

RC-BM5
1-18
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
Fig.4
T102
T104
T105
T106
T103
VR101
TC102 TC101
TC10
TC1
L2
L101
L102
L1
Item Measuring condition Check and adjustment procedure Standard value Adjusting part
Set the AM signal generator at 600kHz and the unit
receiving 600kHz, adjust L105(AM ANT. COIL) for
maximum output.
Set the AM signal generator at 1400kHz and the unit
receiving 1400kHz, adjust TC101 for maximum output.
Set the FM signal generator at 90MHz and the unit
receiving 90MHz, adjust L101 for maximum output.
Set the FM signal generator at 106MHz and the unit
receiving 106MHz, adjust TC102 for maximum output.
Set the AM signal generator at 98MHz with stereo
deviation and the unit receiving 98kHz.
Adjust VR101, so that the separation between the R
and L channels for maximum.
Signal input:
AM ANT. COIL
antenna
Signal output:
IC101 pin14 or
IC101 pin15
Signal input:
FM antenna
Signal output:
IC101 pin14 or
IC101 pin15
Signal input:
FM antenna
Signal output:
IC101 pin14 or
IC101 pin15
AM tracking
adjustment
FM tracking
adjustment
FM stereo
separation
adjustment
1.
2.
1.
2.
1.
2.
L105
TC101
See Fig.4 on
page 1-18.
L101
TC102
See Fig.4 on
page 1-18.
VR101
See Fig.4 on
page 1-18.
L105
(AM ANT. COIL)
Cassette board
T605
Fig.3
IC101
1pin
14pin
15pin

RC-BM5
1-19
Trouble shooting
Circuit Symptom Cause
The unit is on STANDBY mode.
Defective volume control
The unit is on MUTE mode.
Adjust the set position for the best reception.
AM VT faulty
Intermediate frequency tuning faulty
RF tracking faulty
Defective IC101
Adjust FM antenna position for the best
reception.
Defective IC101
Intermediate frequency tuning faulty
Dirty capstan or head
Irregular cassette tape winding
Defective IC202
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
MP3 formats not supported.
No sound
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
AM
FM
Tape
CD
CD-R
CD-RW
MP3-CD
Remedy
Press STANDBY/ON button to turn on the
unit.
Set the volume control to a proper sound
level.
Press MUTE on the remote control.
Readjust (see "Adjustment method").
Readjust (see "Adjustment method").
Readjust (see "Adjustment method").
Check voltages. Replace if necessary.
Check voltages. Replace if necessary.
Readjust (see "Adjustment method").
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.
Use MP3-CD formats supported on this
unit

RC-BM5
1-20
Flow of functional operation until TOC read
Power ON Slider turns REST
SW ON.
Laser ON
Confirm that the voltage at the pin5 of CN502 is
"H"/"L"/"H"
Check that the voltage at the pin64(LD) of
IC501 is +3.3V.
Focus start
FOK
PLL Lock
Turn on radial
servo
Read TOC Confirm the eye-pattern at the "RF" test point.
Turn on focus
servo
Disc spinning
Radial_error
scaling
Check that the voltage at the pin1 and pin2 of
CN502 is +0.78V.