JVC RD-T50RLB, RD-T70RBU Service Manual

RD-T70RBU/RD-T50RLB

SERVICE MANUAL

CD PORTABLE SYSTEM

RD-T70RBU

RD-T50RLB

Area suffix

[RD-T70RBU Only]

Comparison table

Item RD-T50RLB RD-T70RBU
AHB Not used Used
Back light (LCD) Not used Used
Remorte control Not used Used

B ------------------------------- U.K.
E ----------- Continental Europe
EN ------------ Northern Europe
EV -------------- Eastern Europe

Contents

Safety precautions
Preventing static electricity
Important for laser products
Disassembly method
Adjustment method
Flow of functional operation
until TOC read

COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.

1-2
1-4
1-5
1-6
1-13

1-15

Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
Wiring connection

1-16
1-16
1-17
1-26

No.21107

Jul. 2002

RD-T70RBU/RD-T50RLB

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.).

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.

!

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.

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.)

1-2

RD-T70RBU/RD-T50RLB

(U.K only)

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.

2. Any unauthorised design alterations or additions will void the manufacturer's guarantee ; furthermore the
manufacturer cannot accept responsibility for personal injury or property damage resulting therefrom.

3. Essential safety critical components are identified by ( ) on the Parts List and by shading on the
schematics, and must never be replaced by parts other than those listed in the manual. Please note

however that many electrical and mechanical parts in the product have special safety related
characteristics. These characteristics are often not evident from visual inspection. Parts other than
specified by the manufacturer may not have the same safety characteristics as the recommended
replacement parts shown in the Parts List of the Service Manual and 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.

1. Service should be performed by qualified personnel only.

2. This equipment has been designed and manufactured to meet international safety standards.

3. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.

4. Repairs must be made in accordance with the relevant safety standards.

5. It is essential that safety critical components are replaced by approved parts.

6. 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.

1-3

RD-T70RBU/RD-T50RLB

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

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.

2-1 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.

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.

3.

Handle the flexible wire 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.

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 disconnected
from the connector on the CD pickup unit.
(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 flexible wire.

1-4

CD pickup unit

Short land

Flexible wire

Important for laser products

RD-T70RBU/RD-T50RLB

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 när denna del är öppnad

och spårren är urkopplad. Betrakta ej strålen.

VARO : Avattaessa ja suojalukitus ohitettaessa olet

alttiina näkymättömälle lasersäteilylle.Älä katso
säteeseen.

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.
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

DANGER: Invisible laser
radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE
TO BEAM. (e)

WARNING LABEL

ADVARSEL: Usynlig laser-

stråling ved åbning, når
sikkerhedsafbrydere er ude
af funktion. Undgåudsæt-
telse for stråling. (d)

VARNING: Osynlig laser­strålning när denna del
är öppnad och spärren är
urkopplad. Betrakta ej
strålen. (s)

Avattaessa ja suo-

VARO:

jalukitus ohitettaessa
alttiina näkymättö
lasersäteilylle.
säteeseen. (f)

olet

mälle

Älä katso

1-5

RD-T70RBU/RD-T50RLB

Disassembly method

<Main body section>

Removing the front cabinet assembly
and rear cabinet assembly
(See Figs.1 to 4)

1.

Remove the two screws A and two screws B
retaining the front cabinet and rear cabinet
assemblies from the rear of the body.

2.

Remove the battery door from the rear of the body,
then remove the screw C retaining the front cabinet
and rear cabinet assemblies.

3.

Remove the two screws D retaining the CD door
lens from the top of the body with a hexagonal
wrench.

[Caution] If the CD door cannot be opened, the

screws E which are to be removed in
step 4 will not be removable. In this
case, it is necessary to remove the
CD door lens.

A

B

C

Fig.1

D

A

B

Battery door

LCD lens

4.5.Remove the two screws E retaining the front
cabinet assembly from the top of the body.

Disconnect the wire from the connector CN301 on
the main board, then remove the front cabinet
assembly from the rear cabinet assembly.

(See Fig.4.)

E

Front cabinet
assembly

CD door lens

Fig.2

Rear cabinet
assembly

Fig.3

1-6

Front cabinet
assembly

Speaker wire

Fig.4

CN301

Rear cabinet
assembly

Main board

<Front cabinet section>

Prior to performing the following procedures,
remove the front cabinet assembly from the rear
cabinet assembly.

Remove the right and left speaker
assemblies (See Figs.5 and 6)

1.2.Remove the six screws F retaining the speaker net
from the inside of the front cabinet assembly.

Remove the tie band fixing the speaker wires.

[Note] When installing the speaker assemblies,

pass each speaker wire through the
notches a to d at the bottom of the front
cabinet before bundling the wire.

3. Remove the eight screws G retaining the right and
left speaker assemblies from the outside of the
front cabinet assembly.

<Rear cabinet section>

Prior to performing the following procedures,
remove the front cabinet assembly from the rear
cabinet assembly.

RD-T70RBU/RD-T50RLB

Front cabinet assembly Speaker net

F

FF

Tie band

Notch a

Notch b

Notch c

Speaker wire

Notch d

F

Fig.5

G

G

Left speaker

Front cabinet assembly

Right speaker

G

G

Removing the top cabinet assembly

(See Figs.7 to 9)

1.

Remove the screw H retaining the top cabinet
assembly from the rear of the rear cabinet
assembly.

2.

Disconnect the wires from the connectors CN302
and CN303 on the main board at the front of the
rear cabinet assembly. (See Fig.8.)

3.

Loosen the screw J clamping the FM antenna wire.

4.

Pull the top cabinet assembly slightly towards front
and separate it from the rear cabinet assembly,
then remove the FM antenna wire from the post pin
on the main board and remove the top cabinet
assembly.

[Caution] When installing the top cabinet

assembly, be sure to connect the FM
antenna wire.

FM antenna wire

CN303

CN302

Fig.6

Top cabinet assembly

H

Rear cabinet assembly

Fig.7

Top cabinet assembly

Rear cabinet
assembly

J

Main board

Fig.8

Post pin

FM antenna wire

Rear cabinet assembly

WireWire

Fig.9

Main board

1-7

RD-T70RBU/RD-T50RLB

Removing the power supply board and
transformer assembly

Prior to performing the following procedures,
remove the top cabinet assembly from the rear
cabinet assembly.

1.

Remove the two screws K retaining the power
supply board.

2.

Remove the two screws L retaining the transformer
assembly.

3.

Pull out the power supply board from notches e
and f and remove it together with the transformer
assembly.

[Note] After assembly, apply a locking agent to

the screw L.

(See Fig.10)

Removing the battery board
(See Figs.11 and 12)

1.

Disconnect the wire from the connector CN302 on
the main board. (See Fig.11.)

2.

Remove the solder g fixing the wire.

3.

Lift the claw j on the bottom of the rear cabinet
assembly slightly and remove the battery board by
pulling it in the direction of the arrow.

Notch e

Rear cabinet assembly

Main board

Solder g

Notch h

K

Fig.10

Fig.11

Power supply board

Notch f

Transformer
assembly

L

Wire

Notch i

CN302

Wire

[Note] When installing the battery board, pass

the wires through the notches h and i at
the bottom of the rear cabinet.

Removing the handle (See Fig.13)

Prior to performing the following procedures,
remove the top cabinet assembly from the rear
cabinet assembly.

1.Open hooks k and m on the left and right sides of
the rear cabinet assembly and remove the handle
by pulling it toward the rear.

Rear cabinet assembly

Hook k

Claw j

Battery board

Fig.12

Handle

Hook m

1-8

Fig.13

Rear cabinet

assembly

<Top cabinet section>

RD-T70RBU/RD-T50RLB

[Caution] When removing the board assembly,

be careful not to scratch or damage
the top cabinet or the CD door.

Removing the main board

(See Figs.14 to 16)

1.

Remove the three screws M retaining the main
board.

2.

Disconnect the wire and card wires from the
connectors CN708, CN801 and CN802 on the
main board. (See Fig.14.)

3.

Disconnect the wire from the connector CN804 on
the key 2 board. (See Fig.14.)

4.

Disconnect the wire from the connector CN714 on
the door switch board. (See Fig.14.)

5.

Disconnect the wire from the connector P011 on
the CD mechanism board. (See Fig.14.)

6.

Lift the main board slightly in the direction of the
arrow and apply solder to short land section n on
the CD pickup unit.

[Caution] Be sure to apply solder in order to

short land section n on the CD
pickup unit before removing the wire
from the CD pickup unit (see Fig. 16).
If the card wire is removed without
applying this solder, the CD pickup
may be damaged.

7. After soldering, disconnect the card wire from the
connector CN701 on the main board. (See Fig.15.)

CD mechanism

board assembly

Door switch
board

CN708

CN802

CN714

Wire

Short land
section n

M

M

Main board

P011

Card wires

Fig.14

CN701

Fig.15

Key 2 board

CN804

Wire

CN801

Main board

CD pickup unit

Top cabinet

[Caution] After re-connecting the card wire,

be sure to remove the solder from
short land n.

CD pickup unit

Short land
section n

Fig.16

1-9

RD-T70RBU/RD-T50RLB

Removing the key 1 board
(See Fig.17)

1.Remove the four screws N retaining the key 1
board from the back side of the top cabinet
assembly.

Removing the key 2 board and jog
board (See Figs.18 and 19)

1.

Insert a thin tool such as the tip of a thin
screwdriver into the hole p at the back of the top
cabinet assembly and push out the jog knob toward
the front of the top cabinet assembly.

Top cabinet

N

Key 1 board

N

Fig.17

P

2.

Remove the five screws P retaining the key 2 board
from the back side of the top cabinet assembly.

3.

Remove the nut Q and washer retaining the shaft
at the top of the top cabinet assembly.

4.

Take out the key 2 board and the jog board
together.

[Note] Operation knobs are present below the

key 2 board. Be sure to install these in
their correct orientations when installing
the key 2 board. (See Fig. 20.)
In the assembly, apply a locking agent to
the nut Q.

Top cabinet

Operation knob

(RD-T70 only)

Jog board

Hole p

Key 2 board

P

Fig.18

Jog knob

Shaft

Q

1-10

Operation knobs

Washer

Top cabinet

Fig.19Fig.20

RD-T70RBU/RD-T50RLB

Removing the CD mechanism
assembly (See Fig.21)

Prior to performing the following procedures,
remove the main board.

1.Remove the four screws R retaining the CD
mechanism assembly.

[Caution] When replacing the CD mechanism

assembly, be sure not to mistake the
positions of the red and green
dampers. (See Fig.22)

Green

Removing the door switch board

(See Fig.21)

Prior to performing the following procedures,
remove the main board.

1.Remove the screw S retaining the door switch
board.

Top cabinet

R

CD mechanism assembly

Fig.21

S

Door switch
board

R

Red

Replacing the loading belt and CD
door motor (See Figs.23 and 24)

Prior to performing the following procedures,
remove the main board.

1.

Remove the loading belt from the pulley of the CD
door motor.

2.

Remove the wire from the CD door motor by
accessing it through notch q on the CD door motor
holder.

3.

Remove the three screws T retaining the CD door
motor holder.

4.

Remove the CD door motor.

Green

Pulley

Loading belt

T

Red

Fig.22

Wire

Notch q

T

Fig.23

CD door motor

Fig.24

1-11

RD-T70RBU/RD-T50RLB

Removing the FL display board

(See Figs.25 to 27)

Prior to performing the following procedures,
remove the main board.

1.

While keeping the sections r and s on the left and
right sides of the top cabinet assembly in the
direction of the arrow, remove the CD door from the
top cabinet.

2.

Remove the two screws W retaining the CD door
cover.

3.

Remove the two screws X retaining the FL display
board.

[Note] Before attaching the CD door cover,

pass the card wires of the FL display
board through the holes t and u on the
CD door cover. (See Fig.26.)

W

Section r

Hole t

CD door

Fig.25

Section s

Top cabinet

Card wires

Hole u

W

<CD mechanism section>

Removing the CD pickup unit

(See Figs.28 and 29)

Prior to performing the following procedures,
remove the CD mechanism assembly.

1.

Remove the four screws Y retaining the CD cover
plate.

2.

Widen the section v.

3.

While keeping the section v wide open, push the
section w in the direction of the arrow to remove
the shaft, and then remove the CD pickup.

Y

CD cover plate

CD door

X

CD door cover

Fig.26

X

FL display board

Fig.27

CD pickup unit

1-12

Y

v

Shaft

Fig.28 Fig.29

w

Adjustment method

RD-T70RBU/RD-T50RLB

Measurement instruments required
for adjustment

1. Low frequency oscillator,
This oscillator should have a capacity to output 0dB
to 600ohm at an oscillation frequency of 50Hz-20kHz.

2. Signal generator

3. Electronic voltmeter

Measurement conditions

Power supply voltage
AC230V (50Hz)

Radio input signal

AM modulation frequency : 400Hz
Modulation factor : 30%
FM modulation frequency : 400Hz
Frequency displacement : 22.5kHz

Frequency Range

FM 87.5MHz~108MHz
65MHz~74MHz(EE version only)
MW 522kHz~1629kHz

Precautions for measurement

1. Apply 30pF and 33kohm to the IF sweeper output
side and 0.082 F and 100kohm in series to
the sweeper input side.

2. The IF sweeper output level should be made as
low as possible within the adjustable range.

3. Since the IF sweeper is a fixed device, there is
no need to adjust this sweeper.

4. Since a ceramic oscillator is used, there is no need
to perform any MPX adjustment.

5. Since a fixed coil is used, there is no need to adjust
the FM tracking.

6. The input and output earth systems are separated.
In case of simultaneously measuring the voltage
in both of the input and output systems with an
electronic voltmeter for two channels, therefore,
the earth should be connected particularly.

7. In the case of BTL connection amplifier, the minus
terminal of speaker is not for earthing. Therefore,
be sure not to connect any other earth terminal
to this terminal. This system is of an OTL system.

Standard measurement positions of volume
and switch

Power : Standby (Light STANDBY Indicator)
AHB (Active Hyper Bass) : OFF [RD-T70R only]
Main VOL. : 0 Minimum

1-13

RD-T70RBU/RD-T50RLB

Arrangement of adjusting positions

Main board

Tuner section

Items

MW VT adjustment

(Maximum frequency)

MW VT adjustment

(Minimum frequency)

MW IFT adjustment

MW tracking

adjustment

FM VT adjustment

(Maximum frequency)

FM VT adjustment

(Minimum frequency)

FM tracking

adjustment

Note: 1. For adjusting, be sure to use a ceramic type driver.

2. The adjustment of CD section is not required.

Measurement

conditions

Input signal

MW:1629kHz

Measurement point

: VT test point

Input signal

MW:522kHz

Measurement point

: VT test point

Input signal

: 1404kHz

Input signal

: 621kHz

Input signal

: 1404kHz

Input signal

: 621kHz/1404kHz

Input signal

:108MHz

Measurement point

: VT test point

Input signal

MW:87.5MHz

Measurement point

: VT test point

Input signal

:98MHz

1. Set the MW signal generator signal to 1629kHz and feed

it to Loop Antenna.

2. Receiving the signal and adjust the MW OSC coil

L16 obtain the VT is 4.4V +/- 0.1V.

3. Set the MW signal generator signal to 522kHz and feed it

to Loop Antenna.

4. Receiving the signal and confirm that VT is 1.2V+/-0.2V.

5. Change the receiving frequency to 1404kHz.

6. Adjust the MW IFT T2 obtain to maximum output.

7. Change the receiving frequency to 621kHz.

8. Adjust the antenna coil L17 obtain to maximum output.

9. Change the receiving frequency to 1404kHz.

10. Adjust the CT1 obtain to maximum output.

11. Repeat the above steps 7 to 10 of 621kHz and

1404kHz.

1. Set the FM signal generator signal to 108MHz and

receive the 108MHz.

2. Receiving the signal and adjust the FM OSC coil L11

obtain the VT is 4.0+/-0.1V.

3. Set the FM signal generator signal to 87.5MHz and

receive the 87.5MHz.

4. Receiving the signal and confirm that VT is 1.75V+/-0.2V.

5. Change the receiving frequency to 98MHz.

6. Adjust the FM RF coil L14 obtain the maximum output.

Measurement method

Standard

values

V.T : 4.4V+/-0.1V

V.T : 1.2V+/-0.2V

Maximum output

Maximum output

Maximum output

VT: 4.0+/-0.1V

VT:1.75+/-0.2V

Maximum output

Adjusting

positions

MW OSC coil: L16

Adjust the OSC coil

only when the MW

coil block has been

changed.

MW IFT: T2

Adjust the IFT only

when the IFT block

has been changed.

Antenna coil: L17

CT1

FM OSC coil: L11

FM RF coil: L14

1-14

Flow of functional operation until TOC read

Power ON

Play Key

Slider turns REST
SW ON.

Automatic tuning
of TE offset

Confirm that the voltage at the pin5

of CN705-1 is "H"\"L"\"H".

RD-T70RBU/RD-T50RLB

Check Point

Tracking error waveform at TOC reading

Approx.3sec

Tracking
servo
off states

Automatic measurement
of TE amplitude and
automatic tuning of
TE balance

VREF

pin 20 of
IC702(TE)

Approx.

1.8V

Disc states
to rotate

Tracking
servo
on states

Disc to be
braked to stop

TOC reading
finishes

500mv/div
2ms/div

Fig.1

Laser ON

Detection of disc

Automatic tuning of
Focus offset

Automatic measurement of
Focus S-curve amplitude

Disc is rotated

Focus servo ON
(Tracking servo ON)

Automatic measurement of
Tracking error amplitude

Automatic tuning of
Tracking error balance

Check that the voltage at the

pin40 of IC701 is + 5V?

Confirm that the Focus error
S-cuve signal at the pin32 of
IC701 is approx.2Vp-p

Confirm that the signal from
pin24 IC701 is 0V as a
accelerated pulse during
approx.400ms.

Confirm the waveform of
the Tracking error signal.
at the pin 20 of IC702 (R705)
(See Fig.1)

Automatic tuning of
Focus error balance

Automatic tuning of
Focus error gain

Automatic tuning of
Tracking error gain

TOC reading

Play a disc

Confirm the eye-pattern
at the lead of TP713

1-15

RD-T70RBU/RD-T50RLB

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.

1. The level of RF output (EFM output:ampli­ tude of eye pattern) will below.

Is the level of

RFOUT under

1.25V 0.22Vp-p?

YES

O.K

NO

Replace it.

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 TP713.

Finish.

(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.

1-16

Description of major ICs

AN22000A (IC702) : RF & Servo amplifier

1. Terminal layout 2. Block diagram

3TOUT

CEA

9 10 15 22 23 21 20 19 18 2 1

14

OFTR 3TENV

13

12

BDO

11

8

AGC

7

6

5

4

NRFDET

RF_EQ

10
11
12
13
14
15
16

1
2
3
4
5
6
7
8
9

32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17

OFTR

COFTR

BDO

CBOO

ARF

CAGC

RFIN

RFOUT

RFN

FEN

FEOUTNRFDET

SUBT SUBT

BCA

GCA

TEN

BCA

GCA

BCA

GCA

AMPAMPAMP

RD-T70RBU/RD-T50RLB

VDET

TEBPFTEOUT

VDET

BCA

GCA

AMP

PDLD

3

VCC

16

GND

FBAL

25

26

TBAL

GCTL

24

3. Pin function

A C B D E F VREF

Pin No. Symbol Function

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

PD
LD
VCC
RFN
RFOUT
RFIN
CAGC
ARF
CEA
3TOUT
CBOO
BDO
COFTR
OFTR
NRFDET
GND
VREF
VDET
TEBPF
TEOUT
TEN
FEN
FEOUT
GCTL
FBAL
TBAL
E
F
D
B
C
A

APC Amp. Input terminal
APC Amp.Output terminal
Power supply terminal
RF addition Amp.Reversing input terminal
RF addition Amp.Output terminal
AGC input terminal
Terminal of connection of capacity of AGC loop filter.
AGC output terminal
Capacity connection terminal for HPF-Amp.
3TENV output terminal
Capacity connection terminal for RF shade side envelope detection
BDO output terminal
Capacity connection terminal for RF discernment side envelope detection
OFTR output terminal
RFDET output terminal (Negative logic)
Earth terminal
VREF output terminal (Not use)
VDET output terminal (Not use)
VDET input terminal
TE Amp. output terminal
TE Amp. reversing input terminal
FE Amp. reversing input terminal
FE Amp. output terminal
Terminal GCTL & APC
FBAL control terminal
TBAL control terminal
Tracking signal input terminal 1
Tracking signal input terminal 2
Focus signal input terminal 4
Focus signal input terminal 2
Focus signal input terminal 3
Focus signal input terminal 1

2729303132

28

17

1-17

RD-T70RBU/RD-T50RLB

MN101C38CYE (IC801) : System controller

1.Terminal layout

100 76

1

25

26 50

2. Pin function

Pin No.

1~4
5~7

8

9
10
11
12
13
14
15

16~18

19

20, 21

22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43

44~46

47
48
49
50

75

51

Symbol Function

COM 4~1
VLC 3~1
VDD
OSC2
OSC1
VSS
XI
XO
MMOD
VREF­KEY1~3
SFTY
VOL1, 2
ACCHK
PCHK
VREF+
VDAT
SDI
VCK
VCE
SUBQ
SQCK
SHIFT
NRST
PCNT
FTU
FCD
AHB
SMUTE
REM
BLKCK
RDDI
INH
RDCK
AL2
BUZ1~3
POWER
RESERVE2
REST
MDAT

I/O

O

LCD common outputs

-

LCD power supply

-

Power supply

O

Clock output (8MHz)

I

Clock input (8MHz)

-

Ground

I

Sub clock input (32.768kHz)

O

Sub clock output (32.768kHz)

I

Memory mode switch input

-

-Power supply for A/D converter

I

Control key signal input

I

Safety check for power off

I

Rotary digital encoder input

I

AC operate

I

Power supply check

I

+Power supply for A/D converter

O

Common data, PLL & volume

I

PLL data input

O

Common CLK, PLL & volume

O

Common CE, PLL & volume

I

CD sub code data input

O

CD sub code clock output

O

8MHz clock shift for FM receiving

I

Reset input

O

Power ON/OFF control

O

Radio VDD switching control

O

CD 5V control

O

Active bass (RD-T70 only)

O

Signal muting by muting circuit

I

Remote control signal input

I

CD sub code block clock 75Hz input

I

RDS data from decoder IC (JC version: Not use)

I

Inhibit input

I

RDS clock from decoder IC (JC version: Not use)

O

Alarm 2 output

O

Buzzer signal

I

Power key input

-

Not use

I

Pickup rest position input

O

CD common data output

1-18

RD-T70RBU/RD-T50RLB

Pin No.

51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66

67~100

Symbol FunctionI/O

MLD
MCLK
RESERVE3
GVP
MOMU
XRST
S TAT
LED1
MPX
OSW
CSW
LOAD
OCTL
CCTL
SCTL
BLIGHT
SEG34~1

O

CD data latch output

O

CD common clock output

-

Not use

-

Not use

O

Motor driver mute control

O

CD reset output

I

Status signal input

O

Power/standby LED

I

Stereo indicator I/P

I

Door open contact switch

I

Door close contact switch

I

Door is locked signal

O

Door open control

O

Door close control

O

Door speed down

O

Backlight LED

O

LCD segment output

TA8227P (IC302) : Power amplifier

2. Block diagram1. Terminal layout

OUT1

16

12 7

B.S.1

3

2

PW GND

FIN

OUT2 B.S.2

10

11

VCC1

12

ch-1

VCC2

1

6

IN1 NF1

BA15218 (IC401) : Dual operational amplifier

1. Terminal layout & Block diagram

OUT1 1

-IN1 2

1

+IN1 3

G 4

8 Vcc

7 OUT2

6 -IN2

2

5 +IN2

BIAS CIRCUIT

30

THERMAL

SHUT DOWN

PROTECTION

CIRCUIT

45

5

9

RIPPLE

ch-2

7

8

IN2 NF2

45

30

4

PRE GND

1-19

RD-T70RBU/RD-T50RLB

MN662748RPMFA (IC701) : Digital servo & Digital signal processor

1. Terminal layout

80 61

1

60

20

21 40

41

2. Pin function

Pin No. Symbol I/O Function

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
37
38
39
40

BCLK
LRCK
SRDATA
DVDD1
DVSS1
TX
MCLK
M DATA
MLD
SENSE
FLOCK
TLOCK
BLKCK
SQCK
SUBQ
DMUTE
S TAT
RST
SMCK
PMCK
TRV
TVD
PC
ECM
ECS
KICK
TRD
FOD
VREF
FBAL
TBAL
FE
TE
RFENV
VDET
OFT
TRCRS
/RFDET
BDO
LDON

-

Not use

-

Not use

-

Not use

-

Power supply for digital circuit

-

Ground for digital circuit

-

Not use

I

Micro computer command clock signal input

I

Micro computer command data input

I

Micro computer command load signal input (L: Load)

-

Not use, connect to TP716

-

Not use, connect to TP717

-

Not use, connect to TP718

O

Sub code block clock signal output

I

External clock input for sub code Q register input

O

Sub code Q data output

I

Not use, connect to TP719

O

Status signal input

I

Reset signal input (L: Reset)

-

Not use

-

Not use, connect to TP720

O

Traverse enforced output

O

Traverse drive output

-

Not used

O

Spindle motor drive signal (Enforced mode output)

O

Spindle motor drive signal (Servo error signal output)

O

Kick pulse output

O

Tracking drive output

O

Focus drive output

I

Reference voltage for D/A output block

O

Focus balance adjust signal output

O

Tracking balance adjust signal output

I

Focus error signal input (Analog input)

I

Tracking error signal input (Analog input)

I

RF envelope signal input (Analog input)

I

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

Drop out signal input (H:Drop out)

O

Laser on signal output (H:ON)

1-20

Pin No. Symbol I/O Function

41

PLLF2

42

TOFS

43

WVEL

44

ARF

45

IREF

46

DRF

47

DSLF

48

PLLF

49

VCOF

50

AVDD2

51

AVSS2

52

EFM

53

PCK

54

VCOF2

55

SUBC

56

SBCK

57

VSS

58

X1

59

X2

60

VDD

61

BYTCK/TRVSTP

62

CLDCK

63

FCLK

64

IPFLAG

65

FLAG

66

CLVS

67

CRC

68

DEMPH

69

RESY

70

IOSEL

71

/TEST

72

AVDD1

73

OUTL

74

AVSS1

75

OUTR

76

RSEL

77

CSEL

78

PSEL

79

MSEL

80

SSEL

-

Not use

-

Not use

-

Not use

I

RF signal input

I

Reference current input

I

Bias pin for DSL

I/O

Loop filter pin for DSL

I/O

Loop filter pin for PLL

I/O

Loop filter pin for VCO

-

Power supply for analog circuit

-

Ground for analog circuit

-

Not use, connect to TP724

O

Clock output for PLL

I/O

Loop filter pin for Digital servo VCO

-

Not use

-

Not use

-

GND for crystal oscillation circuit

I

Input for crystal oscillation circuit (f=16.9344MHz)

O

Output for crystal oscillation circuit (f=16.9344MHz)

-

Power supply for crystal oscillation circuit

-

Not use

O

Sub code frame clock signal output

-

Not used

O

Interpolation flag signal output, Connect to TP721

O

Flag signal output, connect to TP722

-

Not use

-

Not use

O

De-emphasis detect signal output, Connect to TP723

-

Not use

I

Mode select pin, Connect to DVDD1 (H fix)

I

Test pin, Connect to DVDD1 (H fix)

-

Power supply for analog circuit

O

L-channel audio output

-

Ground for analog circuit

O

R-channel audio output

I

RF signal polarity setting pin, connect to DVDD1 (H fix)

I

Oscillation frequency setting pin, Connect to GND (L fix)

I

IOSEL=H, Test pin, connect to GND (L fix)

I

IOSEL=H, SMCK output, frequency select pin

I

IOSEL=H, SMCK output, SUBQ output mode select pin

RD-T70RBU/RD-T50RLB

NJM2930L05 (IC802) : Regulator

1. Terminal layout

1

123

(Bottom view)

23

1.Output

2.GND

3.InputPUT

1-21

RD-T70RBU/RD-T50RLB

BA6897FP (IC703) : 4channel driver

1.Terminal layout & Block diagram

GND

OUT4+

OUT4-

IN4/R

28

27

26

25

IN4

24

VREF

23

VCC

22

VCC

21

IN3

20

IN3/R

19

OUT3-

18

OUT3+

17

OP-IN+

16

OP-IN-

15

Level

shift

Level

shift

D.BUF

3

IN1/R

D.BUF

4

IN1

T.S.D

5

TR-B

6

7

MUTE

REG-OUT

DRIVER

MUTE

8

GND

9

IN2

Level

Level

10

IN2/R

D.BUF

1

OUT1+

D.BUF

2

OUT1-

BU1923 (IC6) : RDS decoder

1. Terminal layout 2. Block diagram

1

QUAL

RDATA

VREF

MUX

VDD1

VSS1
VSS3

CMP

2
3
4
5
6
7
8

16
15
14
13
12
11
10

9

RCLK
NC
XO
XI
VDD2
VSS2
T2
T1

MUX

VREF

VDD1

4

3

5

Analog

Power supply

100k

120k

D.BUF

shift

shift

D.BUF

100k

11

OUT2-

D.BUF

D.BUF

12

13

GND

OUT2+

-

+

anti-aliasing

filter

14

OP-OUT

VSS3

8th Switched
capacitor filter

7

CMP

8

comparator

16

RCLK

VSS1

VDD2

VSS2

3. Pin function

Pin No. Symbol I/O Function

1

QUAL

O

Demodulator quality,

good data: Hi, bad data: Low
2
3
4
5
6
7
8

R DATA

VREF

MUX

VDD1

VSS1
VSS3

CMP

O

Demodulator data

-

Reference voltage, 1/2 VDD1

I

Composite signal input

-

Analog power supply

-

Analog ground

-

Analog ground

I

Comparator input, C-junction

6

12

Power supply

11

Digital

PLL
57kHz
RDS/ARI

13

14

XO T2 T1

Xl

PLL

1187.5Hz

Reference
clock

Bi-phase
decoder

Pin No. Symbol I/O Function

9,10

T1,T2

I

Test input,

open or connected to ground
11
12
13
14
15
16

VSS2
VDD2

XO
NC

RCLK

XI

-

Digital ground

-

Digital power supply

I

4.332MHz crystal oscillator input

O

4.332MHz crystal oscillator output

-

Not used

O

1187.5Hz demodulator clock

Differential
decoder

Measurement

circuit

10 9

1

QUAL

2

RDATA

1-22

LA1823 (IC5) : 1chip AM/FM, MPX tuner system

1. Terminal layout & Block diagram

RD-T70RBU/RD-T50RLB

24

FM
RF

AM
RF

1 2 4 5 10 11 126 7 8 93

23

GND2

REG VCC1 GND1

22

AM

MIX

AM

OSC

21

VCC2

OSC

BUFFER

20

FM

OSC

FM

MIX

MUTE

IF

BUFFER

17 16

DECODER

ST SW

VCO FF FF

TRIG

STSD

2. Pin function

Pin No. Symbol I/O Function

1

AM_RFIN

2

REG.

3

AM_OSC

4

VCC_1

5

FM_MIXOUT

6

GND_1

7

IF_BUFFER

8

ST_IND

9

AM_MIXOUT

10

FM_IFIN

11

AM_IFIN

12

AGC

13

FM_DET

14

ST/MON_SW

15

AM/FM_SW

16

L_OUT

17

R_OUT

18

MPX_IN

19

DET_OUT

20

FM_OSC

21

VCC_2

22

FM_RFOUT

23

GND_2

24

FM_RFIN

I

AMRF signal input

I

AMRF signal input

-

AM local oscillation circuit

-

Power supply terminal

O

Output terminal for FM mixer

-

Ground

O

IF buffer output

O

Stereo indicator output

O

Output terminal for AM mixer

I

Input of FMIF signal

I

Input of AMIF signal

I

AGC voltage input terminal

O

FM detection signal output

I

Stereo/Monaural switching signal input

I

AM/FM switching signal input

O

Output L-channel

O

Output R-channel

I

Multiplex signal input

O

AM/FM detection output

-

FM local oscillation circuit

-

Power supply terminal

O

Output of FMRF signal

-

Ground

I

Input of FMRF signal

15

PHASE

COMP

FM

S-METERAMDET

FM

IF

14

PILOT

DET

FF

AM

IF

1319 18

FM

DET

AGC

1-23

RD-T70RBU/RD-T50RLB

LC72136 (IC4) : PLL frequency synthesizer

1. Terminal layout

1

XTI

FM
CE

DI

CLOCK

DO

VCOSTOP

AM/FM

LW

MW

SDIN

2
3
4
5
6
7
8
9
10
11

22
21
20
19
18
17
16
15
14
13
12

XT
GND
LPFI
LPFO
PD
VCC
FMIN
AMIN
NC
IFCNT
IFIN

2. Block diagram

1

22

16

15

3

1/2

Reference

Driver

Swallow Counter

1/16,1/17 4bit

12bit

Programmable

Drivers

Phase

Detector

Charge Pump

Unlock

Detector

18

19

20

12

4

5

6

17

21

3. Pin function

C2B

I/F

Powe r

on

Reset

Data Shift Register & Latch

29

71311

Pin No. Symbol I/O Function

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18

XTI
FM
CE
DI
CLOCK
DO
VCOSTOP
AM/FM
LW
MW
SDIN
IFIN
IFCNT
NC
AMIN
FMIN
VCC
PD

I

X'tal oscillator connect (75kHz)

O

LOW:FM mode

I

When data output/input for 4pin(input) and 6pin(output): H

I

Input for receive the serial data from controller

I

Sync signal input use

O

Data output for Controller, Output port

O

"Low": MW mode

O

Open state after the power on reset

-

Not use

I

AM MW signal input

I/O

Data input/output

I

IF counter signal input

O

IF signal output

-

Not use

I

AM Local OSC signal input

I

FM Local OSC signal input

-

Power supply(VDD=4.5-5.5V), When power ON:Reset circuit move

O

PLL charge pump output(H: Local OSC frequency Height than Reference

frequency. L: Low Agreement: Height impedance)
19
20
21
22

LPFO
LPFI
GND
XT

O

Output for active low pass filter of PLL

I

Input for active low pass filter of PLL

-

Connect to GND

I

X'tal oscillator (75KHz)

Universal

Counter

8

14

TA8409S (IC704) : Motor driver

1.Terminal Layout

1-24

123456789

VS

IN2

VCC

OUT 2

NC

GND

OUT 1

VR

IN1

2.Truth table

INPUT OUTPUT

IN1

IN2

OUT1

0

0

1

0

0

1

1

1

OUT2

MODE

STOP

H

L
L

L

H

L

CW/CCW
CCW/CW

BRAKE

LC75342 (IC301) : E. volume

RD-T70RBU/RD-T50RLB

1. Terminal layout

1

DI

2

CE

3

VSS

4

TEST

5

LOUT

6

LBASS2

7

LBASS1

8

LTRE

9

LIN

10

LSELO

11

L4

12

L3

13

L2

14

L1

15

NC

3. Pin function

Pin No.

Symbol Function

1

2
3
4
5
6
7
8

9
10
11
12
13
14
15
16

DI

CE

VSS
TEST
LOUT

LBASS2
LBASS1

LTRE

LIN

LSELO

L4
L3
L2

L1
NC
NC

2. Block diagram

LSELO LIN LTRE LBASS1 LBASS2 LOUT

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

CL

VDD

VREF

NC

ROUT

RBASS2

RBASS1

RTRE

RIN

RSELO

R4

R3

R2

R1

NC

NC

NC

11

L4

12

L3

13

L2

L1

14

15

16

R1

17

R2

18

R3

19

20

R4

10

Serial data and clock input for IC
control
Chip enable
GND
Electric volume connection for test
Volume control and equalizer input
Connection for resistor and capacitor
that from the bass band filter
Connection for capacitor that from
the treble band filter
Volume control and equalizer input
Input selector output
Input signal connections, not use
Input signal connections
Input signal connections
Input signal connections
Not use
Not use

9 8 7 6 5

CONTROL

CIRCUIT

LOGIC

CIRCUIT

CONTROL

CIRCUIT

Pin No.

17
18
19
20
21
22
23

Symbol Function

R1
R2
R3
R4

RSELO

RIN

RTRE

LVref

CCB

INTERFACE

RVref

ROUTRBASS2RBASS1RTRERINRSELO

Input signal connections
Input signal connections
Input signal connections
Input signal connections, not use
Input selector output
Volume control and equalizer input
Connection for capacitor that from

the treble band filter
24
25
26
27
28

RBASS1
RBASS2

ROUT

VREF

Connection for resistor and capacitor

that from the bass band filter

Volume control and equalizer input

NC

Not use

Connection to the 0.5X VDD voltage

generator circuit used as the analog

signal ground
29
30

VDD

CL

Power supply

Serial data and clock input for IC

control

4

TEST

3

VSS

2

CE

1

DI

CL

30

VDD

29

VREF

28

NC

27

262524232221

SPS-445-1-E1 (IC803) : Remote control receiver

1. Terminal layout

123

1 : GND
2 : Vout
3 : Vcc

2. Block diagram

Amp. Limiter

ABLC

BPF

+

TRAP

Detector

Waveform

Shaper

V

CC

R

L

V

out

GND

1-25

RD-T70RBU/RD-T50RLB

Wiring connection

Speaker R-ch

GJ351020192612

2

0

2

0

2

Speaker L-ch

CN302

E

BU.+

Battery board

CN802 CN801

FL display board

GJ353130080107

Headphone jack

CN801

CN802

HP301

GJ354006160110

9

0

CN804

GJ3510000072612

D

GJ351000052612

CN709

Main board

GJ354006150100

CN301

CN302

CN303

CN705

9

0

2
0

2
0

GJ354006230110

0

9

J34

J35

J36

VR801

CN804

Color codes and shown colors

2 ............................... Red

8 ............................... Grey

9 ............................... White

Jog board

CN803

1

GJ353040210200

1

CN803

0 ............................... Black

Key 2 board

Volume board

AHB board

(RD-T70R only)

D

C

C

CN701

Key 1 board

GJ354006190100

1-26

GJ353240080107

RD-T50R

GJ354006140100

2

0

CD door motor

GJ353280080107

RD-T70R

20

8

GJ3510910522031

B

CN708

A

FM ANT

SW701

CN714

B

00

GJ351000082612

GJ351000092612

GJ354006170110

Door switch

board

A

GJ354006180110

9

0

CD mechanism assembly

Spindle motor

GJ353150060207

Feed motor

CD

pickup unit

CN303

J902

2

AC INPUT

0

Power supply board

AC power cord

< MEMO >

RD-T70RBU/RD-T50RLB

1-27

RD-T70RBU/RD-T50RLB

VICTOR COMPANY OF JAPAN, LIMITED

AUDIO & COMMUNICATION BUSINESS DIVISION
PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1Chome,Ohwatari-machi,maebashi-city,371-8543,Japan

No.21107

200207