SAMSUNG MAX632PL Service Manual

3 CD CHANGER
MINI MINI COMPONENT

MAX-632P

SERVICE

Manual

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

© Samsung Electronics Co.,Ltd. Jan. 1997

Printed in Korea
Code no. AH68-20140A

2. Product Specfications

Samsung Electronics

2-1

General

Amp

Cassette

Tuner

Compact Disc

FM

MW
(AM)

LW

(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
2%

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

74

Photo Detector

B

CA

D

PD1
PD2

58K

RF I-V AMP(1)

58K

10K

R2

RF I-V AMP(2)

V2

R1

10K

RF SUMMING

V1 AMP

RFO

RF

66

67

R3

75

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)

R3
10K

V1
10K

V2
10K

57

63

R2

174K

C1 25P

FE

FOCUS
ERROR

AMP

164K

FE Bias

GNDVcc

20K

32K

C2 25P

-(A+C)

-(B+D)

R1

V1 32K

3.6K

20

21

47

48

60K

FZC

0.0022

20K

0.1UF

0.1UF

FDFCT

HFGD

EFR

FE2

470K

DFCT

FS4

20K 48K

58
60

62

46K

580K FS3

FSW

470K

130K

0.1UF

27

40K

6

PFSET

FS2

PHASE
COMPENSATION

92K

40K

10K

3

4.7UF

FSCH

FS1

50K

5.5U 11U

VREG

180K

ISET

FCE

120K

FOCUS
COIL

FSEO

61

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

40

41

39

47
48

7

15

16

54

52

50

51

0.022UF

TZC

0.047UF

150K

BPF

1K
1K

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

8

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

2

TRAY

1

5

4

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.

7

6

5

5

Figure 3-3

Figure 3-4

3-4 Cabinet-Front and Cabinet-Bottom

Samsung Electronics 3-3

Disassembly and Reassembly

A

8

B

8

8

Figure 3-5

3-4 Samsung Electronics

Disassembly and Reassembly

3-5 CD Mecha

13

8

2

7

6

5

4

9

3

1

10

17

16

12

11

20

15

21

14

19

CD SUB PCB

TRAY DISC ASS'Y

TRAY STOPPER

CD MAIN PCB

HOOK

BASE MAIN

18

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.

Figure 3-6

Figure 3-7

3-6 Samsung Electronics

Disassembly and Reassembly

* Reinstall in reverse order.

* Align the Gear-Cam with the Gear-Tray as

shown ing Figure 3-6, then mount the Tray-Disc.

* When assembling the Tray-Disc,take extreme

care not to engage with Gear-Synchro.

Gear-Cam

Gear-Cam

Gear-Cam

Gear-Cam
Timming Point

Gear-Cam

Gear-Synchro

Gear-Disc

Insert

Figure 3-8

Samsung Electronics 3-7

3-6 CD Deck

1. Remove the Shaft !.

2. Lift the P/U @.

Note : Take extreme care not to touch the surface of lens.

3. Lift the Center-ring #.

4. Remove the Spring-T/Table $.

5. Remove the Turn-Table (M) %.

6. Remove 2 screws ^ and then remove the Spindle-Motor &.

7. Remove the Cover-Gear * by pushing the hook.

8. Remove the Gear (c) ( by pushing the hook.

9. Lift the Gear(b) ).

10. Remove the Gear(a) 1.

11. Remove 2 screws 2 and the then remove the Feed-Motor 3.

12. Remove the Chassis-Deck (M) 4.

Disassembly and Reassembly

4. Alignment and Adjustments

4-1 Tuner

Samsung Electronics 4-1

FM THD Adjustment

Minumum Distortion (Figure 4-1)

SSG FREQ.
Adjustment

point
(IFT6)

98 MHz

FM DETECTOR COIL

FM Search Level Adjustment

“TUNED” is shown on FLT (Figure 4-2)

Figure4-2 FM Auto Search Level Adjustment

Figure4-1 IF CENTER and THD Adjustment

SSG FREQ.
Adjustment

point

(MSR1)

98 MHz

SEMI-VR(5KB)

FM SSG

GND

30 dB

FM SSG

Output
GND

Speaker
Terminal

FM
Antenna
Terminal

Distortion Meter

Input

SET

Input

output

Oscilloscope

75Ω

Dummy

FM IN

FM Antenna

SET

5 kB

IFT6

FM T.H.D

MSR1

FM TUNED

4-2 Samsung Electronics

Alignment and Adjustments

4-2 Cassette Deck

4-2-1 To Adjust Tape Speed

1) Measuring tape: i) MTT-111 (or equivalent)
(Tapes recorded with 3kHz)

ii) MTT-5512 (or equivalent)

2) Connect the cassette deck to the frequency counter

as in figure 4-3.

1) Before the actual adjustment, clean the replay/recording
head.

2) Measuring tape :
i) MTT-114NA(or equivalent 12.5kHz AZIMUTH control)
ii) MTT-150(or equivalent : Dolby level 200nwb/m)

3) Dolby NR SW OFF

4) The cassette deck is connections as shown in figure 4-5.

Notes

Notes

NOR
SPEED
Control

counter

1

2

OUT
(connected
to the frequency
counter)

Turn DSR5 to
left and right

3KHz ±1%

5700 ~ 6300KHZ

Fixed

Check

Remark

Standard

To Adjust

Pre-Setup

Item

Step

Pre-Setup
Condition

Same as above

1) 1-Deck:MTT-111

2) Press PLAY
SW button

3) 2-Deck:Same
as below

1) 1-Deck:MTT-111

2) 2-Deck:MTT-5512

3) Press Hi Speed
dubbing SW button

HI SPEED
Control

AZIMUTH

1

2

TP3 OUT
(VTVM is
connected to
the scope)

1) T urn the control
knob to as shown
in Figure4-4.

2) Adjust the right

control screw to
playback REV . Mode

Max output
and same phase
(both channels)

After
adjustment
secure it with
REGION
LOCK.

100mV ±0.5dB

L-CH:T urn DSR3L

to the right and
left

R-CH:Fixed

See the
diagram for
adjustment
locations.

Remark

Standard

To Adjust

Pre-Setup

Item

Step

Pre-Setup
Condition

Same as
above

After putting MTT ­114NA into Deck 1

1) Press FWD PLAY
button.

2) Press REV PLAY
button.

PLAY MTT-150
on Deck 1.

PlayBack
out Level

AZIMUTH

1

2

TP3 OUT
(VTVM is
connected to
the scope)

1) T urn the control
knob to as shown
in Figure4-4.

2)Adjust the right

control screw to
playback REV . Mode

Max output
and same phase
(both channels)

After
adjustment
secure it with
REGION
LOCK.

100mV ±0.5dB

L-CH:T urn DSR4L

to the right and
left

R-CH:Fixed

See the
diagram for
adjustment
locations.

Remark

Standard

To Adjust

Pre-Setup

Item

Step

Pre-Setup
Condition

Same as
above

After putting MTT ­114NA into Deck 2

1)Press FWD PLAY
button.

2)Press REV PLAY
button.

PLAY MTT-150
on Deck 2.

PlayBack
out Level

4-2-2 To Adjust Replay Head

@ Adjust 2-Deck Replay Level

! Adjust 1-Deck Replay Level

TP3

Cassette Deck

output

LINE OUT

Frequency Counter

Figure 4-3

Figure 4-4

Recording /Play head

REVERSE PLAY

AZIMUTH control knob

Figure 4-5

In Out

Cassette Deck

Oscilloscope

LINE OUT

TP3

(GND)

VTVM

V H

1) Connect the measuring instruments as shown in Figure 4-6.

2) Set the DOLBY NR Switch off.

3) Measuring tape:
MTT-5512 (or equivalent: normal recording)

4) The input signals supply 400Hz 400mV into AUX IN of AMP (AUDIO OSC.)

Samsung Electronics 4-3

4-2-3 To Adjust PlayBack

Alignment and Adjustments

Normal
electric
current
for
recording

1

2

3

Connect to TP2
as in Figure4-6
and read VTVM

L-CH : DSR2L
to the right and
left.
R-CH : Fixed

VTVM
400mV ±5%

105KHz ±5%

VTVM
(7V ±5%)

Turn BIAS osci­llator frequency
coil (LL3) to the
right and left.

L-CH: DSR1L and
R-CH: DSR1R to
the right and left

See diagram
for
adjustment
locations

See diagram
for
adjustment
locations

See diagram
for
adjustment
locations

Remark

Standard

To Adjust

Pre-Setup

Item

Step

Pre-Setup
Condition

Connect the
frequency
counter to TP

Connect to
TP1 as in Figure
4-6 and read the
VTVM

Insert MTT-5512
into Deck2, then
press REC button.

Insert MTT-5512 into
Deck2, then press
REC button.

Insert MTT-5512 into
Deck2, then press
REC button.

BIAS OSC.
Frequency

BIAS
Electric
current

Figure 4-6

Audio OSC.

Cassette Deck

Oscilloscope

AUX IN

LINE OUT

VTVM

IN

TP

IN OUT

NOTES

4-3 CD

Alignment and Adjustments

4-4 Samsung Electronics

4-3-1 To Adjust FOCUS BIAS (STOP mode)

1. Set Volt/Div of the oscilloscope to DC 100mV.

2. Ground the scope input and set the waveform to 0v, DC range.

3. Connect the GND terminal of the oscilloscope to Vref,
and (+) terminal to center of AP1.

4. Set NVR1704 to 0mV.

4-3-2 To Adjust Tracking Gain (PLAY mode)

1. Connect the ground terminal of the oscilloscope to Vref and (+) terminal to TP2.

2. Load and play the disc.

3. While the disc is running adjust the gain with NVR1701 as shown below.

4-3-3 To Adjust Focus Gain (PLAY mode)

1. Connect the ground terminal of the oscilloscope to Vref and (+) terminal to TP1.

2. Load and play the disc.

3. While the disc is running adjust the gain with NVR1702 as shown in the following figure.

4-3-4 To Adjust E/F Balance (PLAY mode)

1. Set Time/Div of the oscilloscope to 2mS.

2. Set Volt/Div of the oscilloscope to 0.5V.

3. Ground the scope input and set to DC, and then
set the DC range.

4. Connect the ground terminal of the oscilloscope to Vref
and (+)terminal to TP2.

5. Load and play the disc.

6. Turn NVR1701 counterclockwise to the minimum value.

7. Raise NVR1703 and adjust the waveform so that its middle
comes to ground of the oscilloscope. (Or, until the upper half
of waveform becomes symmetrical to the bottom half,A=B)

8. Adjust NVR1701 (arrow) for normal sound.

TP2

TP1

VR

NVR1704

NVR1703 NVR1702

NVR1701

TE CENTER

FE CENTER

E.F BAL

F.BIAS

0V

Normal Frequency

VOLT/DIV : 0.2V
TIME/DIV : 2mS

VOLT/DIV : 0.2V
TIME/DIV : 2mS

VOLT/DIV : 0.2V
TIME/DIV : 2mS

Low Frequency

High Frequency

A=B

0V

0V

0V

Normal Frequency

VOLT/DIV : 0.1V
TIME/DIV : 2mS

VOLT/DIV : 0.1V
TIME/DIV : 2mS

VOLT/DIV : 0.1V
TIME/DIV : 2mS

Low Frequency

High Frequency

0V

100mV

0V

250mV

0V

100mV

6. Troubleshooting

6-1 Amplifier

6-1-1 Power Malfunction

Front PCB µ-com VDD(5V)

normal?

UIC1 pins 18,47,90

Replace RIC1

Main PCB RIC1(MC7805) IN: 23V

Input voltage normal?

Yes

Check the Power PCB;
RD3(1N4001),
RR2(22Ω, 3W)

Yes

Front PCB

Does UX1(12MHz)

oscillate ?

FRONT PCB PWR-SENS

voltage normal ?

(pin 29 ; 4.5V)

Check the Main PCB
RD11,RR16,RC17,RZD6
RC16,RR17,RR26

Yes

Front PCB

When the power is

ON 'H' displays

at pin 1 ?(5V)

Yes

Connect Front PCB and Main PCB.

Check the connector Main PCB.

Wafer CCW1,CCW2

No

Replace µ-com.

Yes

No

No

No

No

Check the Power PCB : P/T, FUSE

No

Samsung Electronics 6-1

6-1-2 No Output

Yes

AQ1L,AQ1R Base B+ ?

Is Mute selected ?

Headphone Jack short ?

Remove it with Remocon.

Replace Headphone jack
soldering condition.

Main PCB AIC101

(STK4191V)

pins 8,9,11,12,14

B+,B- circuits

Check the B+ power
source part in RD1(PBL403),
RC4 and RC5.

Yes

Confirm for TR short
replace it.

Check if the output line is
short.

No

No

No

No

Yes

Yes

FIC3(NJU3718) pin 27

Check the "H" ?

No

Replace FIC3(NJU3718)

No

6-2 Samsung Electronics

Troubleshooting

6-1-3 Tuner Malfunction(FM/AM)

MZD2 Voltage ok ?

Yes

Check TUNER IC(LA1836)

pin 10 ; 8.6V
pin 14 ; 7.2V

AM ; 0V ?

Yes

LC72131

CONTROL ok?

Yes

FM VT

LC72131 pin 20

1.7V 7.5V ?



Yes

AM VT

LC72131 pin 20

Check the LC72131

CONTROL ok?

Yes

Yes

Check MIC2

pin 20 ?

LPF(MLPF 1L/1R)

output ok?

Check TDA7318 function ok?

Check FEP interior

pattern, and any line

disconnections.

No

Yes

Check for µ-com IC

Replace LC72131

No

MZD1 (5.6V) Voltage ok?

MIC2 (LC72131) FM/AM BAND

Switching ok?

No

No

No

No

No

No

No

0.9V 7V

?

Check MZD2(8.2V),MR29

No

1) Power section
defective?

2)LC72131 Oscillator
(HX1:7.2MHz)ok?

3)System line ok?

Samsung Electronics 6-3

Troubleshooting

6-1-4 V.F.D Malfunction

Yes

Connector inserted

correctly?

No

Yes

Check voltage : AC 4.8V

at FRONT-PCB FLT?

No

Check Main-PCB Front PCB
connection and the voltage of
CCW1, pins 1,2(AC4.8V)

Yes

Check voltage at UIC1

pin 48(-33V)

No

Check the voltage of RZD1(-33V)

Reinsert the connector.







Replace UIC1





6-4 Samsung Electronics

Troubleshooting