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)

35
NO SYMBOL DESCRIPTIONS NO SYMBOL DESCRIPTIONS
1MA4 MICOM ADDRESS INPUT 51 VDD POWER SOURCE TERMINAL
2MA5 MICOM ADDRESS INPUT 52 VDD POWER SOURCE TERMINAL
3MA6 MICOM ADDRESS INPUT 53 VSS GROUND TERMINAL
4MRD MICOM READ SIGNAL INPUT 54 TEST0 TEST TERMINAL
5MWR MICOM WRITE SIGNAL INPUT 55 TEST1 TEST TERMINAL
6MCE CHIP ENABLE SIGNAL INPUT 56 TB2 TEST TERMINAL
7MINT INTERRUPT REQUEST OUTPUT 57 TB3 TEST TERMINAL
8TESTOUT TEST OUTPUT 58 TB4 TEST TERMINAL
9RST RESET TERMINAL 59 TB5 TEST TERMINAL
10 VDD POWER SOURCE TERMINAL 60 TB6 TEST TERMINAL
11 HD7 HOST DATA INPUT 61 TB7 TEST TERMINAL
12 HD8 HOST DATA INPUT 62 TB8 TEST TERMINAL
13 HD6 HOST DATA INPUT 63 VPB GROUND TERMINAL (DRAM AREA)
14 HD9 HOST DATA INPUT 64 TB9 TEST TERMINAL
15 VSS GROUND TERMINAL 65 TB10 TEST TERMINAL
16 HD5 HOST DATA INPUT 66 TB11 TEST TERMINAL
17 HD10 HOST DATA INPUT 67 TB12 TEST TERMINAL
18 HD4 HOST DATA INPUT 68 TB13 TEST TERMINAL
19 HD11 HOST DATA INPUT 69 TB14 TEST TERMINAL
20 VSS GROUND TERMINAL 70 TEST2 TEST TERMINAL
21 HD3 HOST DATA INPUT 71 TEST3 TEST TERMINAL
22 HD12 HOST DATA INPUT 72 VDDM POWER SOURCE TERMINAL
23 HD2 HOST DATA INPUT 73 VSSM GROUND TERMINAL
24 HD13 HOST DATA INPUT 74 ACHCK LRCK OUTPUT FOR DAC ON FAST PLAY
25 VSS GROUND TERMINAL 75 AZCK BASE CLOCK INPUT ON FAST PLAY
26 HD1 HOST DATA INPUT 76 SBSY SUBCODE BLOCK SYNC OUTPUT
27 HD14 HOST DATA INPUT 77 SFSY SUBCODE DATA SYNC FRAME INPUT
28 HD0 HOST DATA INPUT 78 SBDI SUBCODE DATA INPUT
29 HD15 HOST DATA INPUT 79 CLCK SUBCODE DATA CLOCK OUTPUT
30 VSS GROUND TERMINAL 80 C2PI DATA CORRECTION FLAG INPUT
31 HDRQ DATA REQUEST TERMINAL 81 LRCK CHANNEL CLOCK INPUT
32 HWR HOST WRITE SIGNAL INPUT 82 DAI DATA SIGNAL INPUT
33 HRD HOST READ SIGNAL INPUT 83 BCKI BIT CLOCK INPUT
34 IORDY IO TRANSFER READY OUTPUT 84 VSS GROUND TERMINAL
35 VSS GROUND TERMINAL 85 XI MASTER CLOCK I/O
36 CSEL CABLE SELECT INPUT 86 XO MASTER CLOCK I/O
37 HDAK DATA ACKNOWLEDGE INPUT 87 VDD POWER SOURCE TERMINAL
38 INTRQ INTERRUPT SIGNAL OUTPUT 88 MD0 MICOM DATA I/O
39 IOCS16 DATA BIT WIDE SELECT OUTPUT 89 MD1 MICOM DATA I/O
40 VSS GROUND TERMINAL 90 MD2 MICOM DATA I/O
41 HA1 HOST ADDRESS 1 INPUT 91 MD3 MICOM DATA I/O
42 PDIAG POST DIAGNOSTIC I/O 92 MD4 MICOM DATA I/O
43 HA0 HOST ADDRESS 0 INPUT 93 MD5 MICOM DATA I/O
44 HA2 HOST ADDRESS 2 INPUT 94 MD6 MICOM DATA I/O
45 HCS1 CHIP SELECT 1 INPUT 95 MD7 MICOM DATA I/O
46 HCS3 CHIP SELECT 3 INPUT 96 VSS GROUND TERMINAL
47 VSS GROUND TERMINAL 97 MA0 MICOM ADDRESS INPUT
48 DASP DRIVE ACTIVE OUTPUT 98 MA1 MICOM ADDRESS INPUT
49 ADA DATA OUTPUT FOR DAC ON FAST PLAY 99 MA2 MICOM ADDRESS INPUT
50 ABCK BCK OUTPUT FOR DAC ON FAST PLAY 100 MA3 MICOM ADDRESS INPUT
PIN DESCRIPTIONS

36
TA8493AF(I.C-DRIVE)

37
7S32(I.C-OR GATE)
4S66F(I.C-SWITCH)
PQ20WZ51(I.C-REGULATOR)
DAP202K(DIODE ARRAY)
Pin No Pin Name
①DC input(VIN)
ON/OFF control
terminal(VC)
➂DC output(VO)
Output voltage minute
adjustment
terminal(VADJ)
➄GND
➁
➃

38
29EE512-70(I.C-FLASH MEMORY)
BH3541F(I.C-H/P AMP)
Symbol Pin Name Functions
A15-A7 Row Address Inputs To provide memory addresses. Row addresses define a page for a
write cycle.
A6-A0 Column Address InputsColumn Addresses are toggled to load page data.
DQ7-DQ0Data Input/output To output data during read cycles and receive input data during
write cycles. Data is internally latched during a write cycle. The
outputs are in tri-state when OE# or CE# is high.
OE#Chip Enable To activate the device when CE# is low.
OE#Output Enable To gate the data output buffers.
WE#Write Enable To control the write operations
Vcc Power Supply To provide 5-volt supply( ± 10%)
Vss Ground
NC No Connection Unconnected pins.
- PIN DESCRIPTION

39
M56788FP(I.C-DRIVE)
Terminal Symbol Terminal function Terminal Symbol Terminal function
CH3IN CH3 non-inverted input VREF0 Reference voltage output
OUT3 E3 amplifier output VREF Reference voltage input
IN3- E3 amplifier inverted input SS.GND Small signal GND
VBS2 Bootstrap power supply MUTE2 CH5 mute
Vm2 Motor power supply MUTE1 CH1-4mute
N.C N.C IN2+ E2 amplifier non-inverted input
GND Motor GND IN2- E2 amplifier inverted input
IN3+ E3 amplifier non-inverted input GND Motor GND
VM3(-) CH3 inverted output OUT2 E2 amplifier output
VM3(+) CH3 non-inverted output VM2(-) CH2 inverted output
VM4(+) CH4 non-inverted output VM2(+) CH2 non-inverted output
VM4(-) CH4 inverted output VM1(+) CH1non-inverted output
VM5(+) CH5 non-inverted output VM1(-) CH1 inverted output
VM5(-) CH5 inverted output OUT1 E1 amplifier ouptut
OUT5 E5 amplifier output IN1- E1 amplifier inverted input
IN5- E5 amplifier inverted input Vm1 Motor power supply
IN5+ E5 amplifier non-inverted input VBS1 Bootstrap power supply
IN4+ E4 amplifier non-inverted input IN1+ E1 amplifier non-inverted input
IN4- E4 amplifier inverted input REGB Regulator PNP base connect
OUT4 E4 amplifier output REG+ Regulator voltage setting resistor
- PIN DESCRIPTION
1
2
3
4
5
6
7 11
8
9
10
12
13
14
15
16
17
18
19
20
21
34
35
36
37
38
39
40
41
42
,
22
23
24
25
26
27
29 33
28
30
31
32
,

40
TERMINAL TERMINAL FUNCTION REMARKS
NO. SYMBOL
1L
b(G) b-phase upper side power transistor Keep open.
(base)output terminal
2L
a(G) a-phase upper side power transistor Keep open.
(base)output terminal
3L
aa-phase output terminal Connect to the coil.
4V
M2
Supply voltage terminal for motor drive Connect to VM1 externally.
5SB RUN/STOP control terminal H-:RUN, L:STOP
6R
F1 Output current detection terminal Sets limiter current value.
Connect to RF2 externally and
between this terminal and GND.
7GND2 GND -
8C
RF Output current filter terminal Connect a capacitor between this
terminal and GND.
9N.C
10 FGO FG amplifier output terminal Outputs a signal whose
frequency is determined by the
CD rotation frequency.
11 BRK Brake mode select terminal Output mode when VC>Vref
12 Hb-b-phase negative hall signal input Connect to hall element output
terminal terminal.
13 Hb+b-phase positive hall signal input Connect to hall element output
terminal terminal.
14 Ha-a-phase negative hall signal input Connect to hall element output
terminal terminal.
15 Ha+a-phase positive hall signal input Connect to hall element output
terminal terminal.
16 Hc+c-phase positive hall signal input Connect to hall element output
terminal terminal.
17 Hc-a-phase negative hall signal input Connect to hall element output
terminal terminal.
18 HB Hall element bias terminal Open collector output, Connect to
the negative side of hall element
bias line.
19 Cd Forward/reverse changeover gain Adjust a rotation direction
adjustment terminal changeover gain
20 VCC Supply voltage terminal for control VCC(opr)=4.4~5.5V
circuits
21 VCControl amplifier inputer terminal Use the control signal as input.
22 Vref Control amplifier reference voltage Use the reference voltage for
input terminal the control amplifier as input.
23 OSC Triangular wave oscillation terminal Connect a capacitor between
the control amplifier as input.
24 GND1 GND -
25 RF2 Output current detection terminal Sets limiter current value.
Connect to RF1 externally and
between this terminal and GND.
26 MS Mode select terminal Determines output mode.
27 LC(G) c-phase upper side power transistor Keep open.
(base) output terminal
28 LCc-phase output terminal Connect to the coil.
29 VM1 Supply voltage terminal for motor drive Connect to VM2 externally.
30 Lbb-phase output terminal Connect to the coil.
PIN ASSIGNMENT

18
Troubleshooting
+5V, +12V of CN701 is normally inputted
after connection of power cable?
X201, X301, X401 oscillate ?
Check power short and power supply cable
connection state
① IC201 75pin, IC301 12pin, 54pin IC401 87pin for power input
➁ Check C303, C304, C207, C208, R210, C402, C401soldering
➂ If normal replace X201, X301, X401
IC301 19pin change from 0V to 5V ?
Inputted Voltage of IC301 5pin is 1.5V~2.0V ?
Check R401, R402, R333 Rsoldering
Y
Y
N
N
N
N
N
Input / output IC301 57pi n~80pin,
1pin~4pin
pulse waveform ? Check IC301 pin soldering
Y
Y
Y
N
In case FLASH ROM Memory of IC301 16pin
0V, and Rom memory inputted 5V ? Check R320, R321 soldering
Check R301, R302 soldering
Equipments required at repair
1. Oscilloscope(100MHz or more ) 2. PROBE for Oscilloscope(10:1)
3. PC(486 ormore)
Verify the circuit of power unit and the first status(Plug-in the power cable without I/F cable and verify.)
A

19
N
N
N
N
N
Disk insert
Tray in / out ? Refer to Tray open / close
Y
Y
Laser diode on ? Refer to No laser diode on
Y
Laser diode on ? Refer to No focus lock
Y
Focuse up / down ?
Y
Disc rotates ? Refer to No disc rotation
Y
Pause state
❋ Pause state : LED off as disc rotation state and continue 1 track jump
Y
Spindle lock ?
Y
Input Voltage of IC201 9pin, 21pin 3.6V ?
Pick up moves in at power on after moving
out ?
Check after SET assembly
1TRACK JUMP TE
A

20
No tray open/close
FPC is normally inserted in CN702? Retest after inserting FPC in CN702 properly
Start
N
Check SW702 pattern and soldering
❋FPC : Flexible Printed Circuit
Replace SW702
After FPC short check, no error, check SW soldering of deck
FPC of CN702 is normally inserted?
Retest after inserting FPC in CN702 normally
After FPC short check, no error, check SW soldering of deck
FPC of CN702 is normally inserted?
Retest after inserting FPC in CN702 normally
N
NN
IC301 44pin is 0V at pressing SW702?
Y
IC301 29pin is 0V with tray in? CN702 4pin
becomes 0V?
CN702 2pin
becomes 0V?
NN
N
N
IC301 28pin is 0V with tray open?
Check R502,R503,R509 soldering.
CheckIC301,33pin, 34pin soldering. Check R502,R503, soldering. CheckIC301,33pin, 34pin soldering.
Replace IC501Replace IC501
Y
Y
Y
Y
IC501 11pin change from 1.75V to +0V at pressing SW702?
N
N N
N
N
IC301 33pin changes from 1.75V to 5V at pressing SW702?
IC501 13pin changes from +2.4V to +0.7V, and 15pin
from +2.4V to +3.9V, at pressing SW702?
IC501 14pin chages from 2.4V to 3.9V
and 15pin from 2.4V to 0.7V at pressing SW702?
Output Voltage of IC501 13Pin is impressed into
LOADING (-) and IC501 14Pin(+)?
Check pattern and soldering
between CN702 and IC501
Replace loading Motor.
Y
YY
YY
Y
OPEN tary repair CLOSE operation repair

21
No laser on
Refer to ‘No tray open/close’
IC101 10pin changes from 0V to +3.3V? Refer to ‘Check power source and initial state’
N
N
IC101 9pin changes from 4.2V to 3.6V? Check IC101 power input and replace.
Y
Open and close tray(Disc insettion)
Y
CN501 3pin changes from 2V to 2.5V? Check D101, L101, Q102, R102, C103 soldering
Y
CN501 2pin changes from 0V to 0.7V? Check Pick-up FPC connection state
N
N
N
Y
Replace pick-up
Y