Samsung MAX-632P Manuale utente

3 CD CHANGER

MINI MINI COMPONENT

MAX-632P

SERVICEManual

3CD CHANGER MINI COMPONENT CONTENTS

1. Precautions

2. Specifications

3. Disassembly and Reassembly

4. Alignment and Adjustments

5. Special Circuit Descriptions

6. Troubleshooting

7. Exploded Views and Parts List

8. Electrical Parts List

9. Block Diagrams

10. PCB Diagrams

11. Wiring Diagram

12. Schematic Diagrams

ELECTRONICS

Printed in Korea

Code no. AH68-20140A

2. Product Specfications

Samsung Electronics 2-1

General

Amp

Cassette

Tuner

Compact Disc

(AM)

(option)

Power source

Power consumption

Dimensions (mm)

Power output (Front)

(Center)

(Rear)

Total harmonic distortion

Frequency range

Signal to noise ratio

Channel separation

Input sensitivity

Frequency range

Usable sensitivity

Signal to noise ratio

IF rejection ratio

Total harmonic distoration

Separation (Stereo)

Frequency range

Usable sensitivity

Signal to noise ratio

IF rejection ratio

Total harmonic distortion

Frequency range

WOW FLUTTER

Erasing effect

Signal to noise ratio

Total harmonic distortion

Frequency response

Signal to noise ratio

Channel separation

Total harmonic distortion

125Hz ~ 12.5KHz

0.15%

60 dB

40 dB

2.5%

20Hz ~ 20KHz(±1dB)

90 dB(1kHz 0dB)

75 dB(1kHz 0dB)

0.08%(1kHz 0dB)

Frequency range

Usable sensitivity

Signal to noise ratio

146 ~ 290KHz

1000µV

35 dB

87.5 ~ 108MHz

8µV

62 dB

60 dB

0.45%

35 dB

522 ~ 1611KHz

600µV

40 dB

30 dB

50W / Ch(6Ω) (THD 1%)

20W(8Ω) (THD 1%)

10W / Ch(16Ω) (THD 1%)

0.08%

20Hz ~ 20kHz

75 dB

50 dB

400mV

230V 50HZ (option)

300W

270(W) x 317(H) x 333(D)

Specifications are subject to change without notice.

5. Special Circuit Descriptions

5-1 CD

5-1-1 RF Amp (KA9220) : WIC01

5-1-2 Focus Error Amp (KA9220) : WIC01

5-1-3 Focus Servo System (KA9220) : WIC01

Photo Detector

PD1

PD2

58K

RF I-V AMP(1)

58K

10K

RF I-V AMP(2) V2

10K RF SUMMING

V1 AMP RFO

RF I-V Amp(I-1) and RF I-V Amp (I-2) are converted to voltage (via

internal resistance of 58k½) from the current of PD1 (A+C) and

PD2 (B+D):

These voltages are added by the RF summing amplifier.

The signal (A+B+C+D) is applied to RFO (No.2 terminal)

RF output voltage is calculated as follows :

FOCUS ERROR Amp AMPLIFIES the difference

between RF I-V Amp (1) output (A+C) and RF I-V Amp (2) output (B+D)

These two signals are supplied to (-) and (+) input terminals of the

FOCUS ERROR Amp. The FOCUS ERROR signal resulting from this

difference voltage is applied to FE (Terminal No. 57).

The FE output voltage of this low frequency component varies according

to {(A+C) - (B+D)}.

VFE is calculated as follows:

VFE=(R2/R1) X (V2-V1) = 5.4(V2-V1)

This FOCUS ERROR voltage is sent to FOCUS SERVO.

When FS3 is ON, high-frequency gain decreases (time constant is set by pin17, pin19, and capacitor connected to

internal resistance). The capacitor between pin18 and GND sets the time constant to pass low freqencies in PLAY

mode.

The maximum frequency of focus phase compensation is inversely proportional to the resistance connected to pin 7.

Focus search peak is about 1.1 Vp-p, and is inversely proportional to the resistance connected to pins 22,23

(if this resistance changes, the peak of track jump and sled kick change). The inversion input of FZC comparator is set

to 5.7% of the difference between Vcc and VC (pin69) {(5.7% x (Vcc-Vc)}.

Note : If the resistance connected to pin 7 changes, the phase compensation peak of focus,tracking,sled servos change.

At the same time, Ôop-ampÕ dynamic range and offset voltage also change.

VRF = -R3 x (iPD1 + iPD2)

= -R3 x (V1/R1+ V2/R2)

= -R3 x ( + )

= x (V1+ V2)

10K

174K

C1 25P

FOCUS

ERROR

AMP

164K

FE Bias

GNDVcc 20K

32K

C2 25P

-(A+C)

-(B+D)

V1 32K

3.6K

60K FZC

0.0022

20K

0.1UF

FDFCT

HFGD

EFR

FE2

470K DFCT FS4

20K 48K

46K

580K FS3

FSW

470K

130K

0.1UF

40K

PFSET

FS2

PHASE

COMPENSATION 92K

40K

10K

4.7UF

FSCH

FS1

50K

5.5U 11U

VREG

180K

ISET

FCE

120K

FOCUS

COIL

FSEO

FE1

Samsung Electronics 5-1

5-1-4 Tracking Sled Servo System (KA9220) : WIC01

The capacitor between pins 15 and 16 attenuates high frequencies when TG2 is off. The maximum frequency of

tracking phase compensation is inversely proportional to the resistance connected to pin 7 (about 1.2kHz at 470k).

The tracking jump (FWD and REV) is determined when TM3 and TM4 are ON, and the peak voltage induced from

tracking coil is decided by both TM3 and TM4 current values and feedback resistance of pin 47.

Tracking jump max voltage = TM3 (TM4) current x feedback reisistance.

FWD or REV sled kick occurs when TM5 or TM6 is ON, and the peak voltage added to sled motor is decided by

TM5 or TM6 current and the feedbadk resistance of pin 41.

Sled jump max voltage= TM5 (TM6) current x feedback resistance

Each SW current is decided by the resistance connected to pin 22 and 23.

When the resistance is about 150½,

TM3 or TM4 = 11µA,

TM5 or TM6 = 22µA,

This current is inversely proportional to the resistor, variable within a range of 5 to 40µA for TM3.

STOP is the ON/OFF detection signal for the limit SW (or the sled motorÕs innermost cirumference).

22 23

0.022UF

TZC

0.047UF

150K

BPF

TZC

100K

ATC

20K

TE 1

TE2 470K

100K

ATS

TDFC1

0.1UF

680K

66PF

10K

DFCT

0.1UF

RTG 20K

TGSW

470K TG2

82K

110K

PHASE

COMPENSATION

S STOP 1K

100K S STOP

SLED

SLEI

SLEN

10K

56K

100K

ISET VREG

180K

SLED

DRIVER

120K

100K

TKEO

TKEI

TM2

TM6

TM5

TM4 5.5U

TM3 5.5U

10K 90K

TM7

PFSET

470K

TRACKING

COIL

Special Circuit Descriptions

5-2 Samsung Electronics

3. Disassembly and Reassembly

3-1 Cabinet-Top

1. Remove 9 screws holding the Cabinet-Top.

2. Lift the back of the Cabinet-Top and slide it to the rear to remove.

Figure 3-1

Samsung Electronics 3-1

Figure 3-2

Figure 3-2-1

3-2 Samsung Electronics

3-2 CD-Mecha, Door-CD

Disassembly and Reassembly

TRAY

1. After power is connected :

- Turn power on

- Open the tray using the open/close key

2. After power is not connected :

- Turn the Gear clockwise using the hand as shown in figure 3-2-1.

- Pull the Tray in the direction of arrow @.

3. Remove 4 screws $,%and lift the CD-Mecha.

3-3 Cabinet-Rear and Main PCB

1. Remove 17 screws %and then lift the Cabinet-Rear ^and slide it to rear to remove (see arrow).

2. Remove the Main-PCB &.

1. Remove 5 screws *.

2. Remove the Cabinet-Rear by pushing the ÒAÓ and ÒBÓ as shown.

Figure 3-3

Figure 3-4

3-4 Cabinet-Front and Cabinet-Bottom

Samsung Electronics 3-3

Disassembly and Reassembly

Figure 3-5

3-4 Samsung Electronics

Disassembly and Reassembly

3-5 CD Mecha

765

17 16

CD SUB PCB

TRAY DISC ASS'Y

TRAY STOPPER

CD MAIN PCB

HOOK

BASE MAIN

Refer to the next page

for timming point

Samsung Electronics 3-5

Disassembly and Reassembly

3-5 CD Mecha Continued

3-5-1 Tray Disassembly

3-5-2 Main Disassembly

3-5-3 CD Main PCB Disassembly

*When removing, take extreme care not to damage the hook.

1. Open the Tray Disc AssÕy by turning the Gear-Load(%) in the direction of open,then remove the Wire-Tray(Q).

2. Remove two Tray-Stopper and tray.

1. Remove the Tray-Roulette(3) from the Tray-Disc AssÕy(4) by releasing the hook.

2. Remove the PCB-Sensor AssÕy(5) from the tray by releasing the hook.

3. Remove the Worm-Motor AssÕy())from the Tray-Disc AssÕy(4).

4. Remove the Cushion-Motor(1) from the Tray.

5. Remove the Gear-Roulette(2) from the Tray-Disc AssÕy(4) by releasing the hook.

1. Remove the Table-Chuck AssÕy(6) from the Base-Main by turning it.

2. Push the Slider-Cam(!)towards right, then lift it up to remove.

3. Remove the Gear-Tray(^) from the Base-Main by releasing the fixed hook.

4. Remove the Gear-Converter(&)from the Base-Main by releasing the fixed hook.

5. Remove the Gear-Cam(%) from the Base-Main by releasing the fixed hook.

6. Remove the Belt(@) from the Pulley-Motor AssÕy(7) & the Gear-Pulley(#).

7. Remove the Gear-Pulley(#) from the Base-Main by releasing the fixed hook.

8. Remove the Gear-Load($).

9. Remove the Gear-Synchro(*).

10. Desolder two soldering points of the CD SUB PCB, then remove it from Base-Main by

releasing the hook.

11. Remove the Pulley-Motor AssÕy(7) by releasing the hook.

12. Remove the PCB-SW AssÕy(8) by releasing the hook.

1. Remove the Lever-Lifter(9) from the Base-Main by releasing two hooks.

2. Remove four Rubber-CD(0) from the Lever-Lifter and then remove the Deck-CD(“).

3. Remove the Hook.

4. Remove the CD MAIN PCB with the soldering iron.

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