Panasonic BRS1D Service Manual

© Panasonic Corporation 2010. All rights reserved.
Unauthorized copying and distribution is a violation of
law.

PSG1012001CE

A6

Mechanism Unit

Model No. BRS1D

TABLE OF CONTENTS

PAGE PAGE

1 Mechanism Overview (BRS1D) ------------------------------ 2

1.1. Mecha Chassis Assembly / Tray / Traverse
Unit------------------------------------------------------------2

1.2. Traverse Motor--------------------------------------------- 3

2 Warning-------------------------------------------------------------- 4

2.1. Prevention of Electro Static Discharge (ESD)
to Electrostatically Sensitive (ES) Devices---------- 4

2.2. Precaution of Laser Diode------------------------------- 5

2.3. Service caution based on Legal restrictions-------- 6

2.4. Handling Precaution for Traverse Unit--------------- 7

3 Mechanism Operation ------------------------------------------ 9

3.1. Close/Open Operation ----------------------------------- 9

3.2. Open/Close Operation ----------------------------------10

3.3. Initialization-------------------------------------------------11

3.4. Fail Safe Mode--------------------------------------------13

4 Disassembly and Assembly Instructions ---------------14

4.1. Flow Chart--------------------------------------------------15

4.2. Disassembling Procedures-----------------------------16

4.3. Assembly Procedure------------------------------------21

5Reliability----------------------------------------------------------30

5.1. Diagram of Reliability P.C.B. -------------------------- 30

5.2. FUNCTIONS Description ------------------------------ 31

5.3. AGING MODE Description ----------------------------31

5.4. Setup Connection----------------------------------------32

5.5. Jig’s Flow Diagram --------------------------------------34

5.6. P.C.B. Checking------------------------------------------ 38

6 Exploded View and Replacement Parts List----------- 39

6.1. Exploded View and Mechanical replacement
Parts List ---------------------------------------------------39

2

1 Mechanism Overview (BRS1D)

BRS1 mechanism is a single tray mechanism used for CD/DVD models.

1.1. Mecha Chassis Assembly / Tray / Traverse Unit

3

1.2. Traverse Motor

4

2Warning

2.1. Prevention of Electro Static Discharge (ESD) to Electrostatically Sensi­tive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Elec­trostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and
semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage
caused by electrostatic discharge (ESD).

1. Immediately before handling any semiconductor compo nent or semiconductor-equ iped assembly, drain off any ESD on your
body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap,
which should be removed for potential shock reasons prior to applying power to the unit under test.

2. After removing an electrical assembly equiped with ES devices, plac e the assembly o n a conductive surface such as al umin­ium foil, to prevent electrostatic charge build up or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static solder remover device. Some solder removal devices not classified as “anti-static (ESD protected)” can
generate electrical charge sufficient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most
replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminium foil or compara­ble conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be installed.

Caution :

Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the
brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) suf­ficient to damage an ES device).

5

2.2. Precaution of Laser Diode

Caution:

This product utilizes a laser diode with the unit turned "on", invisible laser radiation is emitted from the pickup lens.
Wavelength: 655 nm (DVD)/790 nm (CD)
Maximum output radiation power from pickup: 100 μW/VDE
Laser radiation from the pickup unit is safety level, but be sure the followings:

1. Do not disassemble the pickup unit, since radiation from exposed laser diode is dangerous.

2. Do not adjust the variable resistor on the pickup unit. It was already adjusted.

3. Do not look at the focus lens using optical instruments.

4. Recommend not to look at pickup lens for a long time.

ACHTUNG :

Dieses Produkt enthält eine Laserdiode. Im eingeschalteten Zustand wird unsichtbare Laserstrahlung von der Lasereinheitadg­estrahit.
Wellenlänge : 655 nm (DVD)/790 nm (CD)
Maximale Strahlungsleistung der Lasereinheit :100 μW/VDE
Die Strahlung an der Lasereinheit ist ungefährlich, wenn folgende Punkte beachtet werden:

1. Die Lasereinheit nicht zerlegen, da die Strahlung an der freigelegten Laserdiode gefährlich ist.

2. Den werkseitig justierten Einstellregler der Lasereinhit nicht verstellen.

3. Nicht mit optischen Instrumenten in die Fokussierlinse blicken.

4. Nicht über längere Zeit in die Fokussierlinse blicken.

CAUTION!

THIS PRODUCT UTILIZES A LASER.
USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MA Y RESULT
IN HAZARDOUS RADIATION EXPOSURE.

6

2.3. Service caution based on Legal restrictions

2.3.1. General description about Lead Free Solder (PbF)

The lead free solder has been used in the mounting process of all electrical compone nts on the printed circuit bo ards used for this
equipment in considering the globally environmental conservation.

The normal solder is the alloy of tin (Sn) and lead (Pb). On the other hand, the lead free solder is the alloy mainly consists of tin
(Sn), silver (Ag) and Copper (Cu), and the melting point of the lead free solder is higher approx.30 degrees C (86°F) more than that
of the normal solder.

Definition of PCB Lead Free Solder being used

Service caution for repair work using Lead Free Solder (PbF)

• The lead free solder has to be used when repairing the equipment for which the lead free solder is used.
(Definition: The letter of “PbF” is printed on the PCB using the lead free solder.)

• To put lead free solder, it should be well molten and mixed with the original lead free solder.

• Remove the remaining lead free solder on the PCB cleanly for soldering of the new IC.

• Since the melting point of the lead free solder is higher than that of the normal lead solder, it takes the longer time to melt the
lead free solder.

• Use the soldering iron (more than 70W) equi pped with the tempe rature control after setting the temp erature at 350±30 degrees
C (662±86°F).

Recommended Lead Free Solder (Service Parts Route.)

• The following 3 types of lead free solder are available through the service parts route.
RFKZ03D01K-----------(0.3mm 100g Reel)
RFKZ06D01K-----------(0.6mm 100g Reel)
RFKZ10D01K-----------(1.0mm 100g Reel)

Note

* Ingredient: Tin (Sn), 96.5%, Silver (Ag) 3.0%, Copper (Cu) 0.5%, Cobalt (Co) / Germanium (Ge) 0.1 to 0.3%

The letter of “PbF” is printed either foil side or components side on the PCB using the lead free solder.
(See right figure)

7

2.4. Handling Precaution for Traverse Unit

The laser diode in the optical pickup unit may break down du e to static electricity of clothes or human body. Special care must be
taken avoid caution to electrostatic breakdown when servicing and handling the laser diode in the traverse unit.

2.4.1. Cautions to Be Taken in Handling the Optical Pickup Unit

The laser diode in the optical pickup unit ma y be damaged due to electrostatic discharge generating from clothes or human body.
Special care must be taken avoid caution to electrostatic discharge damage when servicing the laser diode.

1. Do not give a considerable shock to the optical pickup unit as it has an extremely high-precise structure.

2. To prevent the laser diode from the electrostatic discharge da mage, the flexible cable of the optical pickup unit removed
should be short-circuited with a short pin or a clip.

3. The flexible cable may be cut off if an excessive force is applied to it. Use caution when handling the flexible cable.

4. The antistatic FPC is connected to the new optical pickup unit. After replacing the optical pickup unit and connecting the flexi­ble cable, cut off the antistatic FPC.

8

2.4.2. Grounding for electrostatic breakdown prevention

Some devices such as the CD player use the optical pickup (laser diode) and the optical pickup will be damaged by static electricity
in the working environment. Proceed servicing works under the working environment where grounding works is completed.

2.4.2.1. Worktable grounding

1. Put a conductive material (sheet) or iron sheet on the area where the optical pickup is placed , and ground the sheet.

2.4.2.2. Human body grounding

1. Use the anti-static wrist strap to discharge the static electricity form your body (Figure 2).

Figure 2

9

3 Mechanism Operation

3.1. Close/Open Operation

Tray

TRV Slide Plate

TRV Base

Close SW

Open SW

Loading Motor

state

Close
SW ON

stopper

Open

SW ON

stopper

T.S.P. Tray

51.6

55

135

49.9

41.7

R4

R3

7.71

0

0

R8

R4

R3

2.1

38.6

9.2

31.9

129.2

31.1

126.9

R8.45

R3

30.1

132

Reverse brake

Short brake

H

L

H

L

CW

CCW

TT center

TT center

Front boss

33.4

T.S.P. Rack engage

Tray Rack engage

2 6.9

10

3.2. Open/Close Operation

Tray

TRV Slide Plate

TRV Base

Close SW

Open SW

Loading Motor

state

Close
SW ON

stopper

Open

SW ON

stopper

T.S.P.Tray

51.6

55

135

49.9

41.7

7.71

0

0

2.1

38.6

8.6

31.9

129.2

31.1

126.9

30.1

132

H

L

H

L

CW

CCW

TT center

TT center

Front boss

33.8

T.S.P. Rack engage

Tray Rack engage

2

R3

R8.45

R3

6.8

Short brake

11

3.3. Initialization

During the power-up of main unit (using BRS1D mechanism), the state of switches is sensored by the micro-p IC and the traverse
motor is adjusted accordingly.

Note : Refer to Table 1 for the initialization process.

3.3.1. When there is no Initialization

Condition for Initialization Processing:

Table 1

LOAD-SW LD-MOTOR INNER-SW TRV-MOTOR

LC - H CCW
LO CCW H CCW
LC - L CW
LO CCW L CW

Main Consideration

Condition 2

Condition 1

Initialization

Decision Processing

No need initialization

Backup

Memory cleared?

N

Y

EXIT

INNER-SW= L ?

LOAD-SW = LC?

N

Y

EXIT

Initialization Processing

12

3.3.2. When there is Initialization

Initialization Processing

INNER-SW

= L ?

N

Y

TRV-MOTOR

CCW

TRV-MOTOR

CW

INNER-SW

= H ?

N

Y

TRV-MOTOR

CCW

INNER-SW

= L ?

N

Y

TRV-MOTOR

Brake

EXIT

13

3.4. Fail Safe Mode

* Fail safe is a function for recovery of tray movement if mechanism cannot carry out tray open or close within a spe cified time.
Below are the fail safe specification at each position. Refer to table 2.

Fail Safe specification

Close position

move to Open position→ Open position move to Close position→ Close position

Locked at

Motor CCW

condition

( in the case

motor can turn

CW)

Moror CCW for 5sec

(Time out)

↓

Motor CW to Open position

Locked at

Motor CCW

condition

( in the case

motor can not

turn CW)

Moror CCW for 5sec (TO)

↓

Motor CW for 5sec (TO)

↓

Loop

↓

ERROR stop (at 4th TO)

Locked at
Motor CW

condition

( in the case

motor can turn

CCW)

Moror CW for 5sec

(Time out)

↓

Motor CCW to Close

position

Locked at
Motor CW

condition

( in the case

motor can not

turn CCW)

Moror CW for 5sec (TO)

↓

Motor CCW for 5sec (TO)

↓

Loop

↓

ERROR stop (at 4th TO)

Fail Safe

state

Table 2