Jvc RV-B550 Service Manual
SERVICE MANUAL
CD PORTABLE SYSTEM
RV-B550BU
Supplement
RV-B550BU
TIMER
ON/OFF
CLOCK TIMER
SLEEP
DOWN UP SET
PROGRAM
RANDOM
AUTO
PRESET
REPEAT
TUNER
TAPE
C D
BAND
AUX
FM MODE
REVERSE MODE
FF
REW
MULTI CONTROL
DISPLAY
ACS
SOUND
AHB PRO
VOLUME
RM-RXVB55
REMOTE CONTROL
This service manual adds UY version to the service manual
(RV-B550BU No.20826) previously issued.
Contents
Safety precautions ...................................1-2
Importance administering
point on the safety .............1-3
Important for laser products .................... 1-4
Preventing static electricity ...................... 1-5
Disassembly method ............................... 1-6
Area Suffix
UY ................ Argentina
Adjustment method ................................. 1-15
Flow of functional operation
until TOC read ................. 1-19
Maintenance of laser pickup ....................1-20
Replacement of laser pickup ....................1-20
Description of major ICs .......................... 1-21~29
This service manual is made from 100% recycled paper.
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
No.20826C
Jan. 2001
RV-B550BU
Safety precautions
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. Alter ations 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 par ts 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 current 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, par ticularly any exposed metal part having a
return path to the chassis, and measure 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.).
0.15 F AC TYPE
1500 10W
Good earth ground
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
Place this
probe on
each exposed
metal part.
Warning
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.
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.
1-2
CAUTION
!
RV-B550BU
I
mportance administering point on the safety
Note : It's means "J" for U.S.A. and Canada market model.
RV-B550J ONLY
Full Fuse Replacement Marking
Graphic symbol mark
(This symbol means fast blow type fuse.)
should be read as follows ;
FUSE CAUTION
FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ONLY WITH SAME TYPE
AND RATING OF FUSES ;
F1901 : 1.0-A, 250-V
F1902 : 6.3-A, 125-V
F1903 : 6.3-A, 125-V
F1904 : 6.3-A, 125-V
RV-B550J SEULEMENT
Marquage Pour Le Remplacement
Complet De Fusible
Le symbole graphique (Ce symbole signifie
fusible de type a fusion rapide.)
doit etre interprete comme suit ;
PRECAUTIONS SUR LES FUSIBLES
POUR UNE PROTECTION CONTINUE CONTRE
DES RISQUES D'INCENDIE, REMPLACER
SEULEMENT PAR UN FUSIBLE DU MEME TYPE ;
F1901 : 1.0-A, 250-V
F1902 : 6.3-A, 125-V
F1903 : 6.3-A, 125-V
F1904 : 6.3-A, 125-V
1-3
RV-B550BU
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.
VARNING : Osynlig laserstrålning är denna del är öppnad
och spårren är urkopplad. Betrakta ej strålen.
VARO : Avattaessa ja suojalukitus ohitettaessa olet
alttiina näkymättömälle lasersäteilylle.Älä katso
säteeseen.
REPRODUCTION AND POSITION OF LABELS
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.
CAUTION
!
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
ADVARSEL : Usynlig laserstråling ved åbning , når
sikkerhedsafbrydere er ude af funktion. Undgå
udsættelse for stråling.
ADVARSEL : Usynlig laserstråling ved åpning,når
sikkerhetsbryteren er avslott. unngå utsettelse
for stråling.
CLASS 1
LASER PRODUCT
WARNING LABEL
DANGER : Invisibie laser radiation
when open and interlock or
defeated.
AVOID DIRECT EXPOSURE TO
BEAM (e)
VARNING : Osynlig laserstrålning är
denna del är öppnad och spårren är
urkopplad. Betrakta ej strålen. (s)
VARO : Avattaessa ja suojalukitus
ohitettaessa olet alttiina
näkymättömälle lasersäteilylle.Älä
katso säteeseen. (d)
ADVARSEL :Usynlig laserstråling
ved åbning , når
sikkerhedsafbrydere er ude af
funktion. Undgå udsættelse for
stråling. (f)
1-4
RV-B550BU
Preventing static electricity
1. Grounding to prevent damage by static electricity
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.
2. About the earth processing for the destruction prevention by static electricity
In the equipment which uses optical pick-up (laser diode), optical pick-up is destroyed by the static electricity of
the work environment.
Be careful to use proper grounding in the area where repairs are being performed.
2-1 Ground the workbench
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.
2-2 Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
3. Handling the optical pickup
1. 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.)
2. 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.
4. Handling the traverse unit (optical pickup)
1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
2. Cut off the shorted part of the flexible cable using nippers, etc. 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.
3. Handle the flexible cable carefully as it may break when subjected to strong force.
4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it
Attention when CD mecanism assembly is decomposed
*Please refer to "Disassembly method" in the text for pick-up and how to
detach the CD mechanism.
1. Remove CD mechanism assembly.
2. Remove the four screws on the microcomputer board.
3. Disconnect the connector CN907 and CN602 on the microcomputer board.
4. The microcomputer board is put up as shown in Fig.1.
5. Solder is put up before the card wire is removed from connector CN601
on the maicroconputer board as shown in Fig. 2.
(When the wire is removed without putting up solder, the CD pick-up
assembly might destroy.)
6. Please remove solder after connecting the card wire with CN601 when
you install picking up in the substrate.
Card wire
CD changer
mechanism
assembly
Flexible cable
Soldering
Fig.2
Microcomputer
board
Fig.1
1-5
RV-B550BU
Disassembly method
<Main Body>
Removing the side grilles
(See Fig.1 and 2)
1.
Remove the six screws A attaching the side grille on
the left side of the body and pull out the side grille
from the body.
2.
Similarly, remove the side grille on the right side.
Removing the front cabinet assembl y and
the rear cabinet assembly (See Fig.3
and 3a)
A
A
Side grille (left)
A
Fig.1
Side grille (right)
A
Prior to performing the following procedure, remove
the right and left side grilles.
1.
Remove the battery cover on the back of the body.
2.
Remove the eight screws B on the back of the body
and detach the front cabinet assembly and the rear
cabinet assembly. Disconnect the connector CN904
on the LED
Attention:
(Illumination) board.
When reassembling, make sure that
connector CN633 on the rear cabinet is
connected to the speaker terminal on the
front cabinet.
CN904
B
Push Push
Fig.2
B
1-6
LED (Illumination) board
Fig.3a
B
Battery cover
Fig.3
B
RV-B550BU
The CD unit assembly cannot be removed if the
cassette mechanism assembly has not been
removed.
Prior to performing the following procedure, remove
the right and left side grilles, the front cabinet
assembly and the cassette mechanism assembly.
Remove the cassette chassis (See Fig.6).
Disconnect the card wires from connector CN631
and CN632 on the amplifier board.
Disconnect the card wires from connector CN403 on
the microcomputer board.
Remove the two screws D attaching the CD
mechanism assembly on the back of the rear cabinet
(See Fig.8).
Pull out the CD unit assembly toward the front.
1.
2.
3.
4.
5.
Removing the CD unit assembly
(See Fig.6 to 8)
Prior to performing the following procedure, remove
the right and left side grilles and the front cabinet
assembly.
Disconnect the card wires from connector CN405
and CN406 on the microcomputer board located on
the underside of the CD unit of the rear cabinet
assembly.
Remove the four screws C attaching head shield and
the cassette mechanism assembly.
1.
2.
Removing the cassette mechanism
assembly (See Fig.4 and 5)
Fig.4
Fig.5
CN406
CN405
Microcomputer board
Cassette mechanism
assembly
Cassette chassis
Cassette mechanism assembly
C
C
CD unit assembly
CN403
Microcomputer board
CN632
CN631
amplifier board
Cassette chassis
Rear cabinet
D
CD unit assembly
Fig.6
Fig.8Fig.7
Head shield
1-7
RV-B550BU
Removing the tuner board (See Fig.9)
Prior to performing the following procedure, remove
the right and left side grilles, the front cabinet
assembly.
1.
Disconnect the card wire from connector CN403 on
the microcomputer board.
2.
Remove the screw E attaching the tuner board
holder and pull out the tuner board holder together
with the tuner board. Disconnect the antenna wire
from TP1.
Remove the power transformer assemb ly
(See Fig.10)
Prior to performing the following procedure, remove
the right and left side grilles, the front cabinet assembly,
the cassette mechanism assembly and the cassette
chassis.
Microcomputer board
CN403
Tuner board holder
Power supply board
F
Fig.9
Antenna wire
E
Tuner board
CN193
TP1
1.
Disconnect the harness from connector CN192 and
CN193 on the power supply board respectively.
2.
Remove the four screws F attaching the power
transformer assembly.
Remove the amplifier board, the power
supply board and the battery board
(See Fig.11)
Prior to performing the following procedure, remove
the right and left side grilles, the front cabinet
assembly, the cassette mechanism assembly, the
cassette chassis and the CD unit assembly.
1.
Disconnect the 5pin harness from connector CN191
on the power supply board.
2.
Remove the two screws G and the one screw H
attaching the amplifier board.
3.
Disconnect the harness from connector CN192 and
CN193 on the power supply board respectively.
F
Power supply board
CN192
CN191
CN192
Power transformer assembly
Fig.10
CN193
I
G
H
CN631
4.
Remove the two screws I attaching the power supply
board.
5.
Pull out the battery board.
1-8
CN191
Amplifier board
CN631
Fig.11
Battery board
RV-B550BU
Disconnect the card wire from connector CN251 and
CN252 on the key switch board on the front side of
the CD unit assembly.
Remove the f our screws J attaching the microcomputer
board on the underside of the CD unit assembly.
Disconnect the card wire or the harness from
connector CN601, CN602 and CN907 on the
microcomputer board respectively.
1.
2.
3.
Removing the microcomputer board
(See Fig.12 and 13)
Prior to performing the following procedure, remove
the microcomputer board.
Release the four tabs a fixing the right and left
function buttons and the three tabs b by the key
switch board.
Push tabs a and b in the directions of the arrows
carefully not to damage the function buttons
Remove the six screws K attaching the key switch
board.
Pull out the key switch board from two tabs c.
1.
2.
3.
Removing the key switch board
(See Fig.14 and 15)
<CD unit assembly>
Fig.15
Fig.14
Fig.12
PushPush
CN252
CN251
Microcomputer board
Microcomputer board
J
J
J
J
CN602
CN601
CN907
Push
PushPushPush
PushPushPush
Push
a
b
a
b
Key switch board
Function switch buttons
(power)
Function switch buttons
(volume)
Key switch board
c
c
KK
a
Key switch board
PushPushPush
Fig.13
1-9
RV-B550BU
Removing the CD door switch board
(See Fig.16)
Prior to performing the following procedure, remove
the microcomputer board.
1.
Release the two tabs d fixing the CD door switch
board on the back of the CD unit assembly.
Removing the CD mechanism assembly
(See Fig.16)
Prior to performing the following procedure, remove
the microcomputer board.
1.
Remove the f our scre ws L attaching the CD mechanism
holder on the back of the CD unit assembly.
2.
Remove the CD mechanism holder, the CD cushion
and the CD mechanism assembly respectively.
Removing the pickup assembly
(See Fig.17 to 19)
Prior to performing the following procedure, remove
the CD mechanism assembly.
CD mechanism
Assembly
CD cushion
L
L
CD door switch
board
CD mechanism holder
M
d
Fig.16
M
1.
Remove the f our screws M attaching the pickup cover.
2.
Push the shaft stopper by the turn table in the direction
of the arrow and pull out the shaft. The pickup assembly
comes off.
Turn table
Shaft
Shaft stopper
Pickup assembly
Fig.18
Turn table
Shaft
Shaft stopper
M
Pickup assembly
Pickup cover
Fig.17
Fig.19
1-10
RV-B550BU
Prior to performing the following procedure, remove
the front cabinet assembly and the rear cabinet
assembly.
Remove the eight screws P attaching the right and
left speakers on the inside of the front cabinet assembly.
Remove the screw Q attaching the speaker terminal.
1.
2.
Removing the speakers (See Fig.20)
<Front Cabinet Assembly>
Prior to performing the following procedure, remove
the front cabinet assembly and the rear cabinet
assembly.
Remove the two screws N and two screws O
attaching the LED boards on the speaker .
Disconnect the harness from connector FW251 and
FW261.
1.
2.
Removing the LED boards (See Fig.20)
Fig.20
P
P
P
Q
Speaker terminal
Speaker Speaker
LED board
LED board
O
N
P
FW261
FW251
1-11
RV-B550BU
<<Cassette mechanism section>>
Removing the playback/recording & eraser
head ( See Figs. 1 and 2 )
1. While shifting the trigger arms seen on the right
side of the head mount in the arrow direction,
turn the flywheel R in counterclockwise direction
until the head mount has gone out with a click
(See Fig. 1).
2. When the flywheel R is rotated in counterclockwise
direction, the playback/recording & eraser head
will be turned in counterclockwise direction from the
position in Fig. 2 to that in Fig. 3.
3. At this position, disconnect the flexible P.C. board
(outgoing from the playback/recording & eraser head)
from the connector CN31 on the head amplifier &
mechanism control P.C. board.
4. After dismounting the FPC holder, remove the flexible
P.C. board.
5. Remove the flexible P.C. board from the chassis base.
6. Remove the spring a from behind the playback/recording
& eraser head.
7. Loosen the reversing azimuth screw retaining the playback
/recording & eraser head.
8. Take out the playback/recording & eraser head from the
front of the head mount.
9. The playback/recoring & eraser head should also be
removed similarly according to Steps 1 ~ 8 above.
Cassette mechanism
Fig. 1
Playback/recording &
eraser head
Frexible
board
Head amplifier & mechanism
control P.C. board
Flywheel R
Trigger armHead mount
Spring a
Trigger arm
Flywheel R
Reassembling the playback/recording
& eraser head
1. Reassemble the playback head from the front of the head
mount to the position as shown in Fig. 3.
2. Fix the reversing azimuth screw.
3. Set the spring a from behind the Playback/Recording &
Eraser head.
4. Attach the flexible P.C. board to the chassis base, and fix
it with the FPC holder as shown in Fig. 3.
5. The playback/recording & eraser head should also be
reassembled similarly to Step 1 ~ 4 above.
Playback/recording &
eraser head
Spring "a"
FPC holder
Fig. 2
Reversing azimuth
screw
Head
mount
Frexible
board
Head amplifier &
mechanis control
P.C. board
Fig. 3
1-12
RV-B550BU
Removing the head amplifier & mechanism
control P.C. board (See Fig. 4)
1. Remove the cassette mechanism assembly.
2. After turning over th cassette mechanism assembly,
remove the three screws A retaining the head
amplifier & mechanism control P.C. board.
3. Disconnect the connector CN32 on the P.C. board
including the connector CN 1 on the reel pulse P.C.
board.
4. When necessary, remove the 4 pin parallel wire
soldered to the main motor.
Head amplifier &
mechanism control
P.C. board
Removing the main motor assembly
(See Fig. 4~6)
1. Remove the two screws B retaining the main
motor assembly (See Fig. 4, 4a).
2. While raising the main motor, remove the capstan
belt from the motor pulley (See Fig. 4a).
Caution 1: Be sure to handle the capstan belt so
carefully that this belt will not be
stained by grease and other foreign
matter. Moreover, this belt should be
hanged while referring to the capstan
belt hanging method in Fig. 5, 6.
A
Flexible P.C. board
Capstan belt
A
Fig. 4
Main motor
assembly
A
Belt
Main motor
assembly
B
B
4pin parallel wire
Main
moteor
assembly
Motor
pulley
Capstan
belt
Fig. 5
Mechanism motor
assembly
Motor
pulley
Fig. 4a
Main motor
assembly
Flywheel
Motor pulleyCapstan belt
Fig. 6
1-13
RV-B550BU
Removing the flywheel
(See Figs. 7 and 8)
1. Remove the head amplifier & mechanism control
P.C. board.
2. Remove the main motor assembly.
3. After turning over the cassette mechanism,
remove the slit washers b and c fixing the capstan
shafts R and L, and pull out the flywheel R and L
respectively from behind the cassette mechanism.
Flywheel R Flywheel L
Capstan shaft R Capstan shaft L
Flywheel R Flywheel L
Fig. 8
Removing the reel pulse P.C. board and solenoid
(See Fig. 9)
1. Remove the five pawls d~h and screw C reataining the reel pulse
P.C. board.
2. From the surface of the reel pulse P.C. board parts, remove
the two pawls i and j retaining the solenoid.
hd
e
C
Slit
washer
f
b
Slit
washer
Fig.7
C
g
Reel pulse P.C. board
1-14
Solenoid
j
i
Fig. 9
Adjustment method
RV-B550BU
Measuring devices necessary for adjustment
1. Low-frequency oscillator
It must have the ability to output 600ohm from 0 dBs
at an oscillation frequency of 20 Hz 50 Hz.
2.Attenuator impedance: 600ohm
3.Electronic voltmeter
Tuner section
Voltage input to the tuner .......................... +B: DC 5.7 V
VT: DC 12 V
Standard measuring output ...... 26.1 mV (0.28 V) /3ohm
Input locations ..................... AM: standard loop antenna
FM: TP1 (hot) and TP2 (GND)
Standard settings for measuring volume
4.Distortion meter
5.Frequency counter
6.Wow and flutter meter
7.Test tapes
VT-712: tape speed and rotational distortion (3 kHz)
VT-724: standard level (1 kHz)
VT-703: head angle adjustment (10 kHz),
or use VT-73
VT-739: reproduction of frequency characteristics
(1 kHz, 63 Hz, 10 kHz)
8.Blank tape
Type I : AC-225 (TDK-AD)
Type II : AC-514 (TDK-SA)
9.Torque gauge: Tension gauge for playback,
fast-forward and rewind.
FWD (TW211A), REW (TW212A)
and FF/REW (TW2231A)
Sound ..................................................................... OFF
Effective hyper bass ............................................... OFF
Volume adjustment ........................................... VOL. 23
Precautions for measuring
1.Input 30 pF and 33 kohm to the IF sweeper output
2.Lower the output level of the IF sweeper as much as
3.The IF sweeper needs no adjustment as it is a fixed
4.It is not necessary to perform any kind of adjustment
and 0.082 F and 100 kohm to the sweeper input,
respectively.
possible in the adjustable range.
component.
on the MPX, as a ceramic oscillator is used for
measuring.
Specifications for measurement
Power supply voltage ................... AC 100 V (50/60 Hz)
Standard output ........................ Speaker: 0.775V/4ohm
Headphone:0.245V/32ohm
Standard frequency and input level
................... 1 kHz: AUX: -8 dBs
Input level for reproduction of recording characteristics
................... AUX: -28 dBs
Measuring output terminal ................... Speaker: CN633
Load resistance .................................................... 4ohm
Radio input signal
AM frequency ..................................................... 400 Hz
Degree of modulation in AM band .......................... 30%
FM frequency ...................................................... 400 Hz
Frequency deviation in FM band ..................... 22.5 kHz
5.FM tracking adjustment is not necessary as a fixed
coil is used.
6.The grounding circuit is separate from the input and
output. Therefore, be sure to connect to ground
carefully when measuring both the input and output
voltages simultaneously using 2 channels of the
electronic voltmeter.
7.The speaker's minus terminal cannot be connected to
ground when using a BTL format amplifier. Therefore,
do not connect any type of ground wire to this
terminal. The OTL format is used with this system.
8.Use a large wire to connect to the dummy impedance
generator when measuring the output.
9.Be sure to use a band pass filter (DV-12) when using
mixed tape.
1-15
RV-B550BU
Location of parts to be adjusted
Cassette handling mechanism Cassette handling mechanism (reverse side)
Head for recording, playing
and erasing the tape
Head azimuth adjusting
screw (fast-forward)
CN31
Head azimuth adjusting
screw (rewind)
Head azimuth adjusting
adjusting screw (fast-forward)
Head azimuth
screw (rewind)
Location of parts to be adjusted
Head for recording,
playing and erasing the tape
VR37
Motor speed
TP
Bias oscillation frequency (wide pattern)
L301
Bias oscillation frequency
VR31
Lch recording frequency (bias adjustment)
VR32
Rch recording frequency (bias adjustment)
1-16
Adjustment of cassette handling mechanism
RV-B550BU
Items Condition Method for adjustment
Confirmation
of head angle
Confirmation
of tape speed
Test tape: VT-703 (10 kHz)
Measuring output terminal:
Speaker terminal, speaker (R)
(Load resistance: 4 ),
headphone terminal
Test tape: VT-712 (3 kHz)
Measuring output terminal:
Headphone terminal
(1) Play back the VT-703 test tape.
(2) Adjust the head azimuth screws so
that the tape playback mechanism
records the maximum output level in
both the fast-forward and rewind
direction.
(3) In all cases, both the fast-forward and
rewind direction should be adjusted
using head azimuth screws.
Adjust VR37 so that the frequency
counter records 3,015 Hz 15 Hz when
playing back the end of the VT-712 test
tape (3 kHz) in the fast-forward direction.
and confirmation
Items to be confirmed and standard values
Items Condition Method for adjustment
Difference in
speed
between fastforward and
rewind
Test tape: VT-712 (3 kHz)
Measuring output terminal:
Speaker terminal, speaker (R)
(Load resistance: 4 ),
headphone terminal
The difference between fast-forward and
rewind should be less than 60 Hz on the
frequency counter when playing back the
beginning of the VT-712 test tape (3 kHz)
in both directions.
and confirmation
Standard
value
Maximum
output
Tape speed
of cassette
deck: 3,015
Hz 15 Hz
Standard
value
Less than 60 HzShould be
Parts to be
adjusted
Adjust the
head
azimuth
screws
when
changing
the head.
VR37
Parts to be
adjusted
confirmed
when
changing
the motor.
Wow and
flutter
Test tape: VT-712 (3 kHz)
Measuring output terminal:
Headphone terminal
Wow and flutter should be recorded at
less than 0.25% (WRMS) when playing
back the VT-712 test tape (3 kHz) in the
fast-forward direction.
Electronic performance
Items Condition Method for adjustment
Confirmation
of output
Confirmation
of
reproduction
of frequency
characteristics
Recording
bias
frequency
Measuring output terminal:
CN34-5 or 7-terminal
preamp base
Test tape: VT-724
Measuring output terminal:
Headphone terminal
Test tape: VT-739
Fast-forward or rewind
direction:
Test tape: TYPE II (AC-
514)
Measuring terminal: Bias
TP on the base
Confirm that the output from the CN34-5
or 7-terminal preamp base connector is 25 dBs 3 dB when playing back the VT724 test tape.
Reference value: The output from the
headphone terminal is -7 dB 4 dB.
Confirm that the 10 kHz reproduction
level is -1 dB 5 dB compared to the 1
kHz reproduction level when playing back
the VT-739 test tape.
Switch the bias (beat cut switch) between
1 and 2 to confirm that the frequency
changes. Load the test tape (AC-514 for
TYPE II) into the mechanism and preset
it to the record-pause mode.
Confirm that the bias TP frequency on
the base is 100 kHz 6 kHz.
and confirmation
Less than
0.25%
(WRMS)
Standard
value
Output of CN345 terminal: -25
dBs 3 dB
Difference
between Lch
and Rch: within
3 dB
Difference
between 10
kHz and 1 kHz
should be -1
dB 5 dB.
100 kHz 6 kHz
Parts to be
adjusted
1-17
RV-B550BU
Standard values for confirmation of electronic performance
Items Condition Method for adjustment
Erasing
current
(standard
and
reference
value)
Adjustment of
reproduction
of frequency
characteristics
Fast-forward and
rewind direction:
Recording mode
AC-514 for TYPE II,
AC-225 for TYPE I
Measuring terminal:
Both erase head ter
minals
Standard frequencies:
1 kHz and 10 kHz
(REF: -20 dB)
Test tape: TYPE II:
AC-514
Measuring input
terminal: OSC IN
Load the test tape (AC-514 for TYPE II,
AC-225 for TYPE I) into the tape
playback mechanism and preset it to the
record-pause mode.
After setting it to the recording mode,
send 1 M in series to the erase head and
measure the erasing current from both
erase head terminals.
Load the test tape (AC-514 for TYPE II,
AC-225 for TYPE I) into the tape
playback mechanism and preset it to the
record-pause mode.
Input the standard value of -20 dB and
the standard frequencies of 1 kHz and 10
kHz repeatedly to the microphone input
from the transmitter in the recording
mode. Adjust VR31 for Lch and VR32 for
Rch so that the difference in level
between 10 kHz and 1 kHz is -1 dB 5
dB.
Repeat the above for TYPE I and confirm
that the difference in level is -XdB dB.
and confirmation
Standard
value
TYPE II: 110
mA
TYPE I: 75 mA
Difference in
output
between 1 kHz
and 10 kHz: -1
dB 5 dB
Parts to be
adjusted
Lch: VR31
Rch: VR32
(U version only)
Sensitivity of
reproduction
of
microphone
mixing
Microphone input
terminal: 1 kHz, -65 dB
Test tape: VT-724
Based on the reproduction level of the
VT-724 test tape, confirm that the
microphone level is 0 dBs 3 dB when a
1 kHz, 65 dBs signal is input.
(The mixing volume and sound volume
should be at maximum.)
0 dBs 3 dB
(Based on the
reproduction
level of the
VT-724)
1-18
Flow of functional operation until TOC read
Slider turns REST
SW ON.
Automatic tuning
of TE offset
Laser ON
Detection of disc
Automatic measurement of
Focus A-curve amplitude
Automatic tuning of
Foucus offset
Disc is rotated
Focus servo ON
(Tracking servo ON)
Automatic tuning of
Tracking error balance
Automatic measurement of
Tracking error amplitude
Automatic tuning of
Focus error balance
Disc to be
braked to stop
Tracking
servo
on statas
Tracking
servo
off statas
Disc statas
to rotate
TOC reading
finishes
Automatic measurement
of TE amplitude and
automatic tuning of
TE balance
500mv/div
2ms/div
Fig.1
Approx.3sec
pin 25 of
IC601(TE)
Approx
1.8V
VREF
Tracking error waveform at TOC reading
Power ON
Power Key
Confirm that the Focus error
S-cuve siganl at the pin27 of
IC601 is approx.2Vp-p
Confirm that the siganl from
pin24 IC603 is 0V as a
accelerated pulse during
approx.400ms.
Confirm the waveform of
the Tracking error signal
at the pin25 of IC601 (R612)
(See fig-1)
Automatic tuning of
Focus error gain
Automatic tuning of
Tracking error gain
TOC reading
Play a disc
Confirm the eys-pattern
at the lead of TP602
Check that the voltage at the pin 5
of CN602 (or pin 5 of IC901)
is 0V (a moment)?
Check Point
Check that the voltage at the
pin3 of IC601 + side is + 5V?
RV-B550BU
1-19
RV-B550BU
Maintenance of laser pickup
(1) Cleaning the pick up lens
Befor you replace the pick up, please try to
clean the lens with a alcohol soaked cotton
swab.
(2) Life of the laser diode (Fig.1)
When the life of the laser diode has expired,
the following symptoms wil appear.
(1) The level of RF output (EFM output:ampli
tude of eye pattern) will below.
Is RF output
1.1 0.15Vp-p?
YES
O.K
NO
Replace it.
(Fig.1)
Replacement of laser pickup
Turn off the power switch and,disconnect the
power cord from the ac outlet.
Replace the pickup with a normal one.(Refer
to " Pickup Removal " on the previous page)
Plug the power cord in,and turn the power on.
At this time,check that the laser emits for
about 3seconds and the objective lens moves
up and down.
Note: Do not observe the laser beam directly.
Play a disc.
Check the eye-pattern at TP1.
(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 is adjusted while
the pickup is functioning normally,the laser
pickup may be damaged due to excessive current.
Finish.
1-20
Description of major ICs
AN8806SB (IC601) : RF&Servo AMP
1.Terminal Layout
36
PD
LD
LDON
LDP
VCC
RF-
RF OUT
RF IN
C.AGC
ARF
C.ENV
C.EA
CS BDO
BDO
CS BRT
OFTR
/NRFDET
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
PDAC
PDBD
PDF
PDE
PDER
PDFR
TBAL
FBAL
EF EF OUT
TE TE OUT
CROSS
TE BPF
VDET
LD OFF
VREF
ENV
RV-B550BU
2.Block Diagram
36
-+
35
-+
31
34
-+
32
33
-+
6
--
VCBA
+
29
728
-+
--
+
+
VCBA
--
+
VCBA
--
--
VCBA
+
+
--
-+
-+
+
--
27
-+
--
EQ
+
+
--
+
--
910 17
8
AGC
OFTR
BDO
RF
DET
11
12 19
ENV CURCUIT
13
14
15
16
-+
20
21
2
24 25
30
14
23
26
22
3
1-21
RV-B550BU
3. Functions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Symbol
PD
LD
LD ON
LDP
VCC
RF-
RF OUT
RF IN
C.AGC
ARF
C.ENV
C.EA
CS BDO
BDO
CS BRT
OFTR
/NRFDET
GND
ENV
VREF
LD OFF
VDET
TE BPF
CROSS
TE OUT
TE-
FE OUT
FEFBAL
TBAL
PDFR
PDER
PDF
PDE
PD BD
PD AC
I/O
I
APC amp input terminal
APC amp output terminal
O
APC ON/OFF control terminal
I
--
Connect to ground
Power supply
-Inverse input pin for RF amp
I
RFamp output
O
RF input
I
Connecting pin of AGC loop filter
I/O
RF output
O
I/O
A capacitor is connected to this terminal to detect the envelope of RF signal
I/O
A capacitor is connected to this terminal to detect the envelope of RF signal
A capacitor is connected to detect the lower envelope of RF signal
I/O
BDO output pin
O
A capacitor is connected to detect the lower envelope of RF signal
I/O
O
Of-track status signal output
RF detection signal output
O
--
Ground
O
Envelope output
Reference voltage output
O
--
Connect to ground
O
Vibration detection signal output
I
Input pin of tracking error through BPF
O
Tracking error cross output
O
Tracking error signal output
Inverse input pin for tracking error amp
I
O
Output pin of focus error
Inverse input pin for focus error amp
I
I
Focus balance control
I
Tracking balance control
F I-V amp gain control
I/O
E I-V amp gain control
I/O
I
I-V amp input
I-V amp input
I
I
I-V amp input
Functions and operations
I I-V amp input
1-22
RV-B550BU
1
2
3
4
5
6
7
- +
Level
shift
-+
+ Level
shift
+-
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Level
shift
- +
Level
shift
+ -
-+
-+
D.BUF
D.BUF
DRIVER
MUTE
D.BUF
D.BUF
D.BUF
T.S.D
D.BUF
D.BUF
D.BUF
GND
CH4-OUTA
CH4-OUTB
CH4-INA
CH4-INB
BIAS IN
Vcc
CH1-OUTA
CH1-OUTB
CH1-INA
CH1-INB
TEST1
TEST2
MUTE
Vcc
CH3-INB
CH3-INA
CH3-OUTB
CH3-OUTA
OP IN(+)
OP IN(-)
CH2-INB
CH2-INA
CH2-OUTB
CH2-OUTA
GND
OP-OUT
BA6897FP-W (IC602)
: 4channel driver
-+
+-
6
8 9 10 11
12
13
14
15
16
17
2
5
4
7
1813
RIPPLE
FILTER
BIAS
CIRCUIT
STANDBY
SW
IN
IN
POP NOISE
PREVENTION
CIRCUIT
PREDRIVER
PREDRIVER
PREDRIVER
PREDRIVER
POWER
POWER
POWER
POWER
LOAD SHORT
PROTECTOR
LOAD SHORT
PROTECTOR
THERMEL
SHUTDOWN
OVER VOLT AGE/
SURGE PROTECTOR
OUTPUT PIN TO Vcc
SHORT PROTECTOR
OUTPUT PIN TO Vcc
SHORT PROTECTOR
OUTPUT PIN TO GND
SHORT PROTECTOR
OUTPUT PIN TO GND
SHORT PROTECTOR
Vcc
POWER
GND1
POWER
GND2
Vcc2NCNC
GND
NC Vcc1
LA4705N
123456789101112131415161718
LA4705NA (IC631) : power amplifier
1
2
+
-
+
-
1
2
34
5
67
8
OUT1 -IN1
+IN1
VEE
+IN2 -IN2
OUT2
Vcc
BA15218N
BA15218N (IC801/IC831)
: Dual op amplifier
1-23
RV-B550BU
BH3852S (IC501) : E.Volume
1.Block diagram
FILTER
IN2
24 23 22 21 20 19 18 17 16 15 14 13
Vcc
20k
20k
1 2 3 4 5 6 7 8 9 10 11 12
GND
NF2
+
(BASS) (TREBLE)
TONE CONTROL
IN1
NF1
BVN2
BIN2
BVO2
TIN2
2k
(BASS) (TREBLE)
TONE CONTROL
20k
+
47k
47k
BVN1
+
-
20k
BIN1
VOLUMEVOLUME
MATRIX SURROUND SOUND
2k
TIN1
BVO1
TVO2
CONTROL
TVO1
OUT2VCTC
10M
10M 10M
-
+
VOLUMEVOLUME
-
+
Vcc
Vcc
OUT1
BC
Ref.Voltage
10M
SC
VREF
2.Pin function
1
Pin name
GND
Pin No.
2
3
NF1
4 6
7.8
9
10
11
12
BASS1
TRE1
OUT1
VCC
LIVE
VREF
IN1
I/O
Grand terminal
Terminal for 1ch volume input
I
Terminal for gain adjustment of
I
Function Function
input step amp.
Terminal for connection of 1ch
low-frequency filter
Terminal for connection of 1ch
High frequency filter
Terminal for 1ch volume output
O
Terminal for power supply
Terminal for surround control
Terminal for reference voltage
O
output
Pin No.
13
14
15
16
17.18
19 21
22
23
24
Pin name
BASS
TRE
VOL
OUT2
TRE2
BASS2
NF2
IN2
VSET
I/O
Terminal for bass control
I
Terminal for treble control
I
Terminal for volume control
I
Terminal for 2ch volume output
O
Terminal for connection of 2ch
high-frequency filter
Terminal for connection of 2ch
low-frequency filter
Terminal for gain adjustment of
I
input step amp.
Terminal for 2ch volume output
I
Terminal for filter
-
1-24
1. Layout
1
2
3
4
5
6
7
8
9
10
11
22
21
20
19
18
17
16
15
14
13
12
XT
FM/AM
CE
DI
CLOCK
DO
FM/ST/VCO
AM/FM
SDIN
XT
GND
LPFOUT
LPFIN
PD
VCC
FMIN
AMIN
IFCONT
IFIN
Pin
No.
1
2
3
4
5
6
7
8
9
10
11
Pin
No.
12
13
14
15
16
17
18
19
20
21
22
Symbol
XT
FM/AM
CE
DI
CLOCK
DO
FM/ST/VCO
AM/FM
SDIN
Symbol
IFIN
IFCONT
AMIN
FMIN
VCC
PD
LPFIN
LPFOUT
GND
XT
Function
X'tal oscillator connect (75kHz)
LOW:FM mode
When data output/input for 4pin(input) and
6pin(output): H
Input for receive the sirisl data from
controller
Sync signal input use
Data output for Controller
Output port
"Low": MW mode
Not use
Not use
Input/output port
Data input/output
Function
IF counter signal input
IF signal output
Not use
AM Local OSC signal output
FM Local OSC signal input
Power suplly(VDD=4.5-5.5V)
When power ON:Reset circuit move
PLL charge pump output(H: Local OSC
frequency Height than Reference frequency.
L: Low Agreement: Height impedance)
Input for active lowpassfilter of PLL
Output for active lowpassfilter of PLL
Connected to GND
X'tal oscillator(75KHz)
I/O
I
O
I
I
I
O
O
O
-
-
I/O
I/O
I
O
-
I
I
-
O
I
O
I
Reference
Driver
Phase
Detector
Charge Pump
Unlock
Detector
Universal
Counter
Swallow Counter
1/16,1/17 4bit
12bit
Programmable
DriverS
Swallow Counter
1/16,1/17 4bit
Data Shift Register & Latch
Power
on
Reset
C
2B
I/F
1/2
7821113
21
17
6
5
4
3
15
16
22
1
18
19
20
12
2. Block
3. Function
LC72136N(IC2):PLL Frequency synthesizer
RV-B550BU
1-25
RV-B550BU
TA78DL06S(IC390) : Regulator
1
INPUT
SHORT
PROTECTION
GND
2
–
OVER VOLTAGE/
THERMAL SHUT
DOWN PROTECTION
+
3
+
–
Limiter Integrator Comparator
Amp.
OUTPUT
GP1U281X(IC903) : Remocon sensor
BA44W12ST-V5/Z1(IC310):Regulator
2
B.P.F
VCC
CTL
GND
5
3
Demodulator
+
–
+
–
4
1
OUT1
OUT2
TA2008AN (IC 1): FM/AM,IF/DET
FM
AM
OSC
AM
MIX
OUT
VT
FM
OSC
FM
OSC
AGC
+-
Block diagram
AM
ANTENNA
FM
ANTENNA
24 23 22 21 20 19 18 17 16 15 14 13
AM
RF
123456789101112
BPF
AM
RF IN
FM
RF
FM
RF IN
FM
RF OUTAMOSC
MIX
GND 1 MIX
OSC Buff OUT
V
CC1
Buff
AGC
V
CC2
Buff
1/8 DIV
FM
IF
OSC
0UT
AM
REQ
SW
FM IF
IF OUT
Buff
AM
DET
AM
IF OUT
/REQ
IF
IF
AM IF
IF REQ
+-
DET OUT
AF
Buff
LEVEL
DET
GND 2 FM
MPX IN
AM/FM
ST/MONO
SW
FM
DET
DET
GND
ST
LED
LPF 1
ST
IIND
VCC Vout
AM
FM
LPF 2
FM MPX
MUTE
L OUT
+-
MONO
SY
VCO
R OUT
+-
V
CC
1-26
L OUT
R OUT
MN35510(IC603):DIGITAL SERVO&DIGITAL SIGNAL PROCESSER
RV-B550BU
1. Terminal Layout
2.Block Diagram
LRCKIN(MSEL)
BCLK(SSEL)
SRDATAIN
(PSEL)
IOSEL
CLVS
CRC
BLKCK
CLDCK
SBCK
SUBC
DEMPH
RESY
FLAG6(RESY)
SSEL
SQCK
SUBQ
AVDD2
AVDD2
PCK
EFM
PLLF
DSLF
IREF
DRF
ARF
RSEL
PSEL
MLD
MCLK
MDATA
CK384(EFM)
VCOF
BYTCK
SMCK
FCLK
CSEL
MSEL
X2
X1
ÊSTAT
DIGITAL
DEEMPHSIS
SUB
CODE
BUFFER
DSL.
PLL
VCO
VCO
ITUNING
GENERATION
PITCH
CONTROL
20 ~ 1
21
~
40
41 ~ 60
8TIMES
OVER SAMPUNC
DIGITAL FILTER
EFM
DEMODULATION
SYNC
INTERPOLATION
SUBCODE
DEMODULATION
MICRO
COMPUTER
INTERFACE
COVERTER
A/D
80
~
61
CIRC
ERROR
CORRECTION
DEINTERLEVE
CLV
SERVO
1BIT
DAC
LOGIC
S
16k
SRAM
INPUT
PEM
(R)
PEM
(L)
D/A
CONVERTER
OUTPUT
DIGITAL
AUDIO
INTERFASE
DIGITAL
AUDIO
INTERFASE
INTER POLATION
SOFT MUTING DIGITAL
ATTENUATION
PEAK DETECTIVE
AUTO CUE
PORT
SERVO
TIMING GENERATOR
AVSS1
AVDD1
OUTR
OUTL
FLAG
IPFLAG
TX
ECM
PC
LRCK
SRDATA
BCLK
DMUTE
TRKV
KICK
VREF
TRVSTR
ECS
TVD
TRD
FOD
TBAL
FBAL
TOFS
TES
/TLOCK
/FLOCK
PLAY
LDON
WVEL
SENSE
D
/
D
V
V
V
R
V
S
D
D
S
S
S
D
D
T
S
1
1
F
/
E
T
E
S
T
R
T
F
E
E
N
V
T
R
C
R
S
B
V
D
D
O
E
T
/
R
F
D
E
O
F
T
1-27
RV-B550BU
3. Description
Pin
symbol
No.
BCLK
1
2
LRCK
SRDATA
3
4
DVDD1
DVSS1
5
TX
6
7
MCLK
MDATA
8
MLD
9
10
SENSE
11
FLOCK
12
TLOCK
13
BLKCK
14
SQCK
15
SUBQ
16
DMUTE
STATUS
17
18
RST
19
SMCK
20
PMCK
21
TRV
22
TVD
23
PC
24
ECM
25
ECS
26
KICK
27
TRD
28
FOD
29
VREF
30
FBAL
31
TBAL
FE
32
TE
33
34
RF ENV
35
VDET
OFT
36
37
TRCRS
38
RFDET
BDO
39
LDON
40
I/O
O
Not used
Not used
O
O
Not used
I
Power supply (Digital)
I
Connected to GND
Digital audio interface output
O
Micom command clock signal input
I
(Data is latched at signal's rising point)
Micom command data input
I
I
Micom command load signal input
Sence signal output
O
O
Focus lock signal output Active :Low
O
Tracking lock signal output Active :Low
sub-code - block - clock signal output
O
I
Outside clock for sub-code Q resister input
Sub-code Q -code output
O
I
Connected to GND
Status signal
O
(CRC,CUE,CLVS,TTSTOP,ECLV,SQOK)
Reset signal input (L:Reset)
I
I
Not used
I
Not used
O
Traverse enforced output
O
Traverse drive output
I
Not used
Spindle motor drive signal (Enforced
O
mode output) 3-State
Spindle motor drive signal (Servo error
O
signal output)
Kick pulse output
O
Tracking drive output
O
O
Focus drive output
Reference voltage input pin for D/A
I
output block (TVD,FOD,FBA,TBAL)
Focus Balance adjust signal output
O
O
Tracking Balance adjust signal output
Focus error signal input(Analog input)
I
Tracking error signal input(Analog input)
I
I
RF envelope signal input(Analog input)
Vibration detect signal input(H:detect)
I
Off track signal input(H:off track)
I
Track cross signal input
I
RF detect signal input(L:detect)
I
BDO input pin(L:detect)
I
Laser ON signal output(H:on)
O
Description
Pin
No.
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
symbol
TES
PLAY
WVEL
ARF
IREF
DRF
DSLF
PLLF
VCOF
AVDD2
AVSS2
EFM
PCK
PDO
SUBC
SBCK
VSS
XI
X2
VDD
BYTCK
CLDCK
FLAG
IPPLAG
FLAG
CLVS
CRC
DEMPH
RESY
IOSEL
TEST
AVDD1
OUT L
AVSS1
OUT R
RSEL
CSEL
PSEL
MSEL
SSEL
I/O
Tracking error shunt signal output(H:shunt)
O
I
Not used
I
Not used
I
RF signal input
I
Reference current input pin
Bias pin for DSL
I
I/O
Loop filter pin for DSL
Loop filter pin for PLL
I/O
I
Not used
I
Power supply(Analog)
Connected to GND(Analog)
Not used
III
Not used
I
Not used
I
Not used
I
Not used
Connected to GND(for X'tal oscillation
I
circuit)
Input of 16.9344MHz X'tal oscillation circuit
I
Output of X'tal oscillation circuit
O
I
Power supply(for X'tal cscillation circuit)
I
Not used
I
Not used
I
Not used
I
Not used
I
Not used
I
Not used
I
Not used
Not used
I
Not used
III
pull up
pull up
Power supply(Digital)
Lch audio output
O
I
Connected to GND
Rch audio output
O
II
pull up
Connected to GND
I
Connected to GND
I
Connected to GND
I
Pull up
Description
1-28
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