Samsung MAX-632P User manual

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
© 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
FE1
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
A
B
8
8
8
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
13
8
2
765
4
9
31
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 2and 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) Turn 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:Turn 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) Turn 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:Turn 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 osci-
llator 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