Samsung SC-148B User manual

Model:SC-148B
CONTENTS
CD-ROMservice manual
• Specifications
• Cautions at Service
• External Part Name
• Disassembly Method
• Exploded Views & Part List
• Packing Options
• Operational Position Diagram
• Block Diagram
• Troubleshooting
• Circuit Diagram
•
Main Components Block Diagram & Pin
Descriptions
• Electrical Parts List
The design and part of this product is subject to change without prior notice for performance improvement.

©Samsung Electronics Co., Ltd.
MAY, 1999
Printed in Korea
Code No.: BG68-00112A
Electronics

1
Specifications
1. General Specifications
- Drive type : Computer built-in
- Power consumption : DC+5V, 1.7A
DC + 12V, 1.0A
- Dimensions : 149mm(W)X42.5mm(H)X200mm(L)
- Net Weight : 950g
2. Electrical Features
- Interface : ATAPI BUS(IDE)
- Data transfer rate 7200KByte/Sec MAX
(5400KByte/Sec AVG.)
-ACCESS TIME:1/3 stroke : Below 100msec
full stroke : Below 180msec
- Buffer Capacity : 128Kbyte
- Error ratio : Mode 1: Below 10-12
Mode 2: Below 10-9
- Frequency response : 20Hz~20KHz (Limeout)
100Hz~20KHz (H/pout)
- Signal to noise ratio : 75dB(1KHz, Limeout)
65dB(1KHz, H/pout)
- Distortion factor : 0.15%Less than(1KHz)
- Channel separation : 65dB(1KHz, Limeout)
55dB(1KHz, H/pout)
- Signal output level : LINEOUT : 0.7 Vrms(±20%)
H/PHONE:0.6 Vrms(±20%)
- Used laser : Semiconductor laser
2. Earthing cautions at handling Pick-up
- Because the laser diode in optical Pick-up is subject
to get out of order due to the potential difference
occurring by electricity load charged in clothes or
bodies, observe the following earthing items at
handling.
1)Body earthing(hand) : Be sure to wear a wrist strip
with one side earthed.(Impedance : Below 104).
It removes the electricity formed in body.
2) Work table earthing : Put the earthed conductive plate
(Impedance : Below 104) such as copper plate
on work table.
3)Cautions for clothes : Do not have any clothes
touch with Pick-up because the electricity formed in
clothes is destroyed easily.
Cautions at Service
1. General Items
1) Be careful not to have your eyes or a part of body touch
with laser diode at repair because this product uses laser
diode.
2) Do not disassemble Pick-up at repair. If the laser diode is
bad, replace the entire Pick-up.
3) Keep away from TV or other electrical units at
repair to prevent influence from surrounding units.
4) If you replace the parts during repair, be sure to unplug
the power cable before replacement.
5) If you insert a disc into the drive, be sure to load it
correctly.
6)Because this unit can't be used by itself, surely
mount it on PC (486 DMA support) and check the
operations in use of private device driver floppy
diskette. Refer to Instruction manual.
7)This unit has many parts with features related to
safety and especially, for essential parts, the
importance is indicated on circuit diagram and
part list.
Be certain to use the parts with same specifications at
replacing these parts.

28
Main Components Block Diagram and Pin Descrition
TA2143FN(I.C-RF)

29
PIN NO PIN NAME FUNCTION
1VCC POWER SOURCE/VOLTAGE TERMINAL
2RFGC RF FREQUENCY CONTROL SIGNAL INPUT TERMINAL
3RPBW SEL TERMINAL COMBINATIAU DETELTOR CONTROL TERMINAL
4FNI MAIN BEAM AMP INPUT TERMINAL
5FPI MAIN BEAM AMP INPUT TERMINAL
6TPI SUB BEAM AMP INPUT TERMINAL
7TNI SUB BEAM AMP INPUT TERMINAL
8MDI MONITOR PHOTO-DIODE AMP INPUT TERMINAL
9LDO LASER DIODE AMP OUTPUT TERMINAL
10 SEL APC CIRCHIT ON/OFF SIGNAL, LDO TERMINAL CONTROL INPUT TERMINAL.
BOTTOM/PEAK FREGUENCY SWITCH TERMINAL
11 TEB TRACKING ERROR BALANCE CONTROL SIGNAL INPUT TERMINAL
12 VRO STANDARD VOLTAGE OUTPUT TERMINAL VCC=5.0V VRD=2.1V
13 TEN TRACKING ERROR SIGNAL GENERATING AMP REVERSE INPUT TERMINAL
14 TEO TRACKING ERROR SIGNAL GENERATING AMP OUTPUT TERMINAL
15 SBAD SUB BEAM ADDITIONAL SIGNAL OUTPUT TERMINAL
16 FEO FOCUS ERROR SIGNAL GENERATING AMP OUTPUT TERMINAL
17 FEN FOCUS ERROR SIGNAL GENERATING AMP REVERSE INPUT TERMINAL
18 VDDIN VDD INPUT TERMINAL
19 VREF STANDARD VOLTAGE(VREF)OUTPUT TERMINAL VDDIN=3.6[V] VREF=1.80[V]
20 RFRP SIGNAL GENERATING AMP OUTPUT TERMINAL FOR TRACK COUNTER
21 BTC RECT SIGNAL GENERATING BOTTOM DETECTOR CONTROL TERMINAL
22 RFCT RFRP SIGNAL CENTER LEVEL OUTPUT TERMINAL
23 PKC RFCT SIGNAL GENERATING PEAK DETECTOR CONTROL TERMINAL
24 RFRPIN SIGNAL GENERATING AMP INPUT TERMINAL FOR TRACK COUNTER
25 RFGO RF SIGNAL AMPLITUDE ADJUSTING AMP OUTPUT TERMINAL
26 GVSW AGC,TE, FE AMP GAIN SWITCH TERMINAL
27 AGCIN RF SIGNAL AMPLITUDE ADJUSTING AMP INPUT TERMINAL
28 RFO RF SIGNAL GENERATING AMP OUTPUT TERMINAL
29 GND GND TERMINAL
30 RFN2 RF SIGNAL GENERATING AMP INPUT TERMINAL
PIN DESCRIPTIONS
RPBW SEL FC [kHz]
L / HiZ L / HiZ 100
L / HiZ L / HiZ 400
L / HiZ L / HiZ 800
GVSW LEVEL MODE
GND CD-RW
HIZ NORMAL
VCC NORMAL
SEL LEVEL APC CIRCUIT LDO
GND OFF 100
HiZONCONTROL SIGNAL OUTPUT
VDDONCONTROL SIGNAL OUTPUT

30
TC9450BF(I.C-DSP)

31
NO SYMBOL DESCRIPTIONS NO SYMBOL DESCRIPTIONS
1VSS3 DIGITAL GND TERMINAL 51 VDD3 DIGITAL +3.3V POWER SOURCE TERMINAL
2BCK BIT CLOCK OUTPUT TERMINAL (1.4112MHz) 52 SEL APC CIRCUIT ON/OFF SIGNAL OUTPUT TERMINAL
3AOUT AUDIO DATA OUTPUT TERMINAL 53 FLGA INTERNAL SIGNAL MONITOR OUTER FLAG OUTPUT TERMINAL
4DOUT DIGITAL OUT OUTPUT TERMINAL 54 FLGB INTERNAL SIGNAL MONITOR OUTER FLAG OUTPUT TERMINAL
5MBOV BUFFER MEMORY OVER SIGNAL OUTPUT TERMINAL.OVER: H 55 FLGC INTERNAL SIGNAL MONITOR OUTER FLAG OUTPUT TERMINAL
6IPF COMPLEMENTARY FLAG OUTPUT TERMINAL 56 FLGD INTERNAL SIGNAL MONITOR OUTER FLAG OUTPUT TERMINAL
7SBOK CRCC RESULT OUTPUT TERMINAL FOR SUBCODE Q DATA 57 VDD3 DIGITAL +3.3V POWER TERMINAL
8CLCK SUBCODE P-W DATA READ CLOCK INPUT/OUTPUT TERMINAL 58 VSS3 DIGITAL GND TERMINAL
9VDD3 DIGITAL +3.3V POWER TERMINAL 59 I00 GENERAL I/O TERMINAL
10 VSS5 DIGITAL GND TERMINAL 60 I01 GENERAL I/O TERMINAL
11 DATA SUBCODE P-W DATA OUTPUT TERMINAL 61 I02 GENERAL I/O TERMINAL
12 SFSY PLAY DEVICE FRAME SYNC SIGNAL OUTPUT TERMINAL 62 I03 GENERAL I/O TERMINAL
13 SBSY SUBCODE BLOCKING OUTPUT TERMINAL 63 /DMOUT IO 0,1 OUTPUT MODE SELECT TERMINAL
14 SPCK OUTPUT TERMINAL FOR PROCESS STATUS SIGNAL READ CLOCK 64 /CKSE “X” TAL SELECT TERMINAL
15 SPDA PROCESS STATUSE OUTPUT TERMINAL 65 /DACT DIGITAL/ANALOG CONVERT TEST MODE TERMINAL
16 COFS ERROR CORRECTION CLOCK (7.35 KHz)OUTPUT TERMINAL 66 FGIN CAV GENERATION FG SIGNAL INPUT TERMINAL
17 MONIT LSI INTERNAL SIGNAL MOMITOR TERMINAL 67 TESI01 TEST INPUT TERMINAL
18 VDD5 DIGITAL + 5V POWER TERMINAL 68 TESIN TEST INPUT TERMINAL
19 TESTIOO TEST INPUT TERMINAL 69 TEST0 TEST MODE TERMINAL
20 AWRC ANALOG SIGNAL OUTPUT TERMINAL 70 TEST1 TEST MODE TERMINAL
21 PVDD3 +3.3V POWER TERMINAL FOR PLL-EXCLUSIVELY 71 TEST2 TEST MODE TERMINAL
22 PDOS POSITION GAP SIGNAL OUTPUT TERMINAL OF EFM & PLCK SIGNALS 72 XVSS3 MICOM CLOCK DRIVING CIRCUIT GND TERMINAL
23 PDO POSITION GAP SIGNAL OUTPUT TERMINAL OF EFM & PLCK SIGNALS 73 XI MICOM CLOCK DRIVING CIRCUIT INPUT TERMINAL
24 TMAXS TMAX DETECTION RESULT OUTPUT TERMINAL 74 XO MICOM CLOCK DRIVING CIRCUIT OUTPUT TERMINAL
25 TMAX TMAX DETECTION RESULT OUTPUT TERMINAL 75 XVDD3 MICOM CLOCK DRIVING CIRCUIT +3.3V POWER TERMINAL
26 LPFN AMP REVERSE INPUT TERMINAL FOR LOW-PASS FILTER 76 DVSS3 D/A CONVERT R CHANNEL ANALOG GND TERMINAL
27 LPFO AMP OUTPUT TERMINAL FOR LOW-PASS FILTER 77 RO R CHANNEL DATA OUTPUT TERMINAL
28 PVREF VREF(+1.65V) FOR PLL ONLY 78 DVDD3 DIGITAL/ANALOG CONVERT +3.3V POWER TERMINAL
29 VCOREF VCO CENTER FREQUENCY BASE LEVEL TERMINAL 79 DVR DIGITAL/ANALOG CONVERT BASE VOLTAGE TERMINAL
30 VCOF VCO FILTER TERMINAL 80 LO L CHANNEL DATA OUTPUT TERMINAL
31 AVSS3 ANALOG GNDTERMINAL 81 DVSS3 D/A CONVERT L CHANNEL ANALOG GND TERMINAL
32 SLCO DATA SLICE GENERATING DIGITAL/ANALOG CONVERT OUTPUT TERMINAL 82 TEST3 TEST MODE TERMINAL
33 RFI RF SIGNAL INPUT TERMINAL 83 TEST4 TEST MODE TERMINAL
34 AVDD3 ANALOG +3.3V POWER TERMINAL 84 BUS0 DATA INPUT TERMINAL FOR MICOM INTERFACE
35 RFCT RFRP SIGNAL CENTER LEVEL INPUT TERMINAL 85 BUS1 DATA INPUT TERMINAL FOR MICOM INTERFACE
36 RFZI INPUT TERMINAL FOR RFRO ZERO CROSS 86 BUS2 DATA INPUT TERMINAL FOR MICOM INTERFACE
37 RFRP RF RIPPLE SIGNAL INPUT TERMINAL 87 BUS3 DATA INPUT TERMINAL FOR MICOM INTERFACE
38 FEI FOCUS ERROR SIGNAL INPUT TERMINAL 88 VDD5 DIGITAL 5V POWER SOURCE TERMINAL
39 SBAD SUBBEAM ADDITION SIGNAL INPUT TERMINAL 89 VSS5 DIGITAL GNDTERMINAL
40 TEI TRACKING ERROR SIGNAL INPUT TERMINAL 90 /XRD READ SIGNAL FOR MICOM INTERFACE
41 TEZI TRACKING ERROR ZERO CROSS INPUT TERMINAL 91 /XWR WRITE SIGNAL FOR MICOM INTERFACE
42 FDO FOCUS EQ. OUTPUT TERMINAL 92 /XCM FIRST WORD RECOGNIZE SIGNAL FOR MICOM INTERFACE
43 TRO TRACKING EQ. OUTPUT TERMINAL 93 /XCE MICOM INTERFACE CHIP ENABLE TERMINAL
44 VREF ANALOG-BASED POWER TERMINAL(+1.65V) 94 TEST5 TEST MODE SELECT TERMINAL
45 RFGC RF AMPLITUDE CONTROL SIGNAL OUTPUT TERMINAL 95 /RST RESET INPUT TERMINAL
46 TEBC TRACKING BALANCE CONTROL SIGNAL OUTPUT TERMINAL 96 /HSO PLAY SPEED MODE FLAG OUTPUT TERMINAL
47 FMO FEED EQ. OUTPUT TERMINAL 97 /UHSO PLAY SPEED MODE FLAG OUTPUT TERMINAL
48 FVO SPEED ERROR OR FEED SEARCH OUTPUT TERMINAL 98 /SHSO PLAY SPEED MODE FLAG OUTPUT TERMINAL
49 DMO DISK EQ OUTPUT TERMINAL 99 EMPH EMPHASIS FLAG OUTPUT TERMINAL OF SUBCODE QDATA
50 VSS3 DIGITAL GND TERMINAL 100 LRCK CHANNEL CLOCK (44.1KHz) OUTPUT TERMINAL
PIN DESCRIPTIONS

32
KS88C4504-12(I.C-MICOM)

33
NOORIGIN NAME I/O FUNCTION NO ORIGIN NAME I/O FUNCTION
1/PM /CE OEXT PROM CHIP ENABLE 41 P1.4 MT1 IPRODUCT TEST PINO
2/DM /UCS OINTERFACE CHIP SELECT 42 P1.3 MT2 IPRODUCT TEST PIN1
3/RD7 /URD OINTERFACE CHIP READ 43 P1.2 MT3 IPRODUCT TEST PIN2
4/WR /UWR OINTERFACE CHIP WRITE 44 P1.2 TRO_SW OTRO CONTROL SWITCH
5VLD VLD IVOLTAGE LEVEL DETECT 45 P1.0 STEP_P1 OSTEP MOTOR ENABLE
6P5.1/AS N.C. ON.C 46 P0.7/ADC3 0.5Vref ORESET CONTROL
7P5.0/ N.C. ON.C 47 R0.6/ADC2 FMO IFMO
8P4.7/CS3 /XCE ODSP CHIP SELECT 48 P0.5/ADC1 /EJECT IEJECT BUTTON
9P4.6/CS2 /XCM ODSP FIRST COMMAND 49 P0.4/ADC0 /PLAY IN.C
10 P4.5/CS1 /XRD ODSP READ 50 AVREF AVREF IADC REFERENCE VOLTAGE
11 P4.4/CS0 /XWR I/O DSP WRITE 51 P0.3 SLEEP_SW OSELLP MODE CONTROL
12 VDD1 VDD IVCC 52 VSS2 VSS2 IVSS2
13 VSS1 VSS IGND 53 VDD2 VDD2 IVDD2
14 Xout Xout OCRYSTAL OUTPUT 54 P0.2 EMPHA O
AUDIO EMPHASIS CONTROL
15 Xin Xin ICRYSTAL INPUT 55 P0.1 /XRST OOUTPUT DEVICE RESET
16 VPP/EA EA IADDRESSING MODE SELECT 56 P0.0 LED_BUSY OLED BUSY CONTROL
17 P4.3 BUS3 I/O DSP COMMAND BUS3 57 D0 D0 IEXT PROM DATA0
18 P4.2 BUS2 I/O DSP COMMAND BUS2 58 D1 D1 IEXT PROM DATA1
19 /RESET /RESET IMICOM RESET 59 D2 D2 IEXT PROM DATA2
20 P4.1 BUS1 I/O DSP COMMAND BUS1 60 D3 D3 IEXT PROM DATA3
21 P4.0 BUS0 I/O DSP COMMAND BUS0 61 D4 D4 IEXT PROM DATA4
22 PWM1 PWM1 OPWM CONTROL 62 D5 D5 IEXT PROM DATA5
23 PWM0 PWM0 OPWM CONTROL 63 D6 D6 IEXT PROM DATA6
24 P3.5 CENT ODRIVE IC RESET 64 D7 D7 IEXT PROM DATA7
25 P3.4 CENT OCENTER SERVO CONTROL 65 A0 A0 OEXT PROM ADDRESS 0
26 P3.3 SPM_FG ISPINDLE MOTOR CONTROL 66 A1 A1 OEXT PROM ADDRESS 1
27 P3.2 SPIN_CTL OCPINDLE BRAKE CONTROL 67 A2 A2 OEXT PROM ADDRESS 2
28 P3.1 /OPEN IOPEN LIMIT SWITCH 68 A3 A3 OEXT PROM ADDRESS 3
29 P3.0 /CLOSE ICLOSE LIMIT SWITCH 69 A4 A4 OEXT PROM ADDRESS 4
30 P2.7/INT7 RF_CON OPLL CONTROL 70 A5 A5 OEXT PROM ADDRESS 5
31 P2.6/INT6 N.C. I/O N.C 71 A6 A6 OEXT PROM ADDRESS 6
32 P2.5/INT5 /SCOR IDSP SYNC INTERRUPT 72 A7 A7 OEXT PROM ADDRESS 7
33 P2.4/INT4 TR_OUT OTRAY OPEN CONTROL 73 A8 A8 OEXT PROM ADDRESS 8
34 P2.3/INT3 TR_IN OTRAY CLOSE CONTROL 74 A9 A9 OEXT PROM ADDRESS 9
35 P2.2/INT2 D_INT IROM DECODER INTERRUPT 75 A10 A10 OEXT PROM ADDRESS 10
36 P2.1/INT1 FLGC IFOCUS O.K. 76 A11 A11 OEXT PROM ADDRESS 11
37 P2.0/INT0 FLGA ITRACKING EPROR ZERO 77 A12 A12 OEXT PROM ADDRESS 12
38 P1.7 MON OSPINDLE MOTOR ON/OFF 78 A13 A13 OEXT PROM ADDRESS 13
39 P1.6 SPM_DIR IN.C 79 A14 A14 OEXT PROM ADDRESS 14
40 P1.5 AMUTE OAUDIO MUTE CONTROL 80 A15 A15 OEXT PROM ADDRESS 15
PIN DESCRIPTIONS

34
TC9474FA(I.C-DECODER)