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FILE NO. 810-200207 SERVICE MANUAL DVD VIDEO PLAYER SD-2550A SD-2550H SD-2550T Jun., 2002...
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LASER BEAM CAUTION LABEL When the power supply is being turned on, you may not remove this laser cautions label. If it removes, radiation of a laser may be recceived. PREPARATION OF SERVICING Pickup Head consists of a laser diode that is very susceptible to external static electricity. Although it operates properly after replacement, if it was subject to electrostatic discharge during replacement, its life might be shortened.
CONTENTS SECTION 1 GENERAL DESCRIPTIONS 3. TROUBLESHOOTING ............1-37 1. OPERATING INSTRUCTIONS ..........1-1 3-1. Main Circuit ............... 1-37 2. LOCATION OF MAIN PARTS AND 3-1-1. Servo System ..............1-37 MECHANISM PARTS ............. 1-30 3-1-2. Location Diagram of Servo Test Point ......1-44 2-1.
2. LOCATION OF MAIN PARTS AND MECHANISM PARTS 2-1. Location of Main Parts Disc motor PC board Feed motor PC board EU02 Power supply PC board EU03 Front display PC board Loading motor PC board EU01 Main PC board Fig. 1-2-1 1-30...
2-2-2. Type B Tray Clamper stay Fig. 1-2-7 Mechanism chassis assembly (Top side) Loading motor PC board Mechanism chassis Fig. 1-2-8 Mechanism chassis assembly (Bottom side) 1-34...
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Loading belt Gear Kick lever Gear Gear Loading motor Disc motor Cam Slider Fig. 1-2-9 Mechanism chassis assembly (Internal side) 1-35...
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Front damper Front damper Rack gear assembly Pickup assembly Gear A Gear B assembly Sub chassis Rear damper Rear damper Fig. 1-2-10 Pickup mechanism chassis assembly (Top side) Feed motor Feed motor PC board Fig. 1-2-11 Pickup mechanism chassis assembly (Bottom side) 1-36...
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3. TROUBLESHOOTING 3-1. Main Circuit 3-1-1. Servo System (1) Initial Operation after Power ON Power ON Send each LSI hard RST command and initial command. Pickup head is positioned at transmission initial position. Is tray closed? Pin 5 of CN502, TCLS=L Tray close operation Pin 126 of IC605: LDMP = H/L...
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The pickup transmission initial operation is carried out to determine the initial position by transmitting the pickup to the innermost position once (start-limit switch (pin 4 of CN503) Pickup (P.U.) transmission initial develops "L".) and to the external direction at low speed operation does not occur.
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Disc kind misjudgement (Initial setting is NG.) Are FE and RFSB signals for each disc normal? Check IC502. Lens cleaning. Check peripheral Replace pickup head. circuit of IC605. Fig. 1-3-4 Laser operating current DVD Iop 20mA 35mA 60mA 20mA 45mA 80mA CD Iop Check laser operating current.
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(2) Picture appears (PLAY) PLAY Disc motor (D.M.) forced accelleration (500 ms) Focus search Repeat three times. Is forcus servo CLV servo ON. Tracking balance adjustment Tracking servo ON. Focus gain adjustment Automatic adjustment is carried out when a disc is replaced after power ON.
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Disc motor (D.M.) does not rotate. Does pin 117 of IC401 (TP409) PLCK oscillate around 10 MHz ? Check peripheral Check peripheral circuits circuit of IC402. of IC402. Check disc motor and wiring. Fig. 1-3-10 Focus servo is NG. Focus servo ON signal waveform Are FE, RFSB, FE signal...
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Tracking servo is NG. Is TE signal normal? Check peripheral Check IC502. circuit of IC605. Fig. 1-3-13 Signal waveform at Signal waveform at tracking servo ON (CD) tracking servo ON (DVD) TE signal Pin 151 (TP406) of IC401 1.65V RFRP signal Pin 153 (TP408) of IC401 Search ON (SRCH) Pin 38 (TP411) of IC401...
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Does pulse of Disc playback is NG (DVD). L = 1.65V and H = 3.3V develop at pin 131 and L = 0V and H = 1.65V develop at pin 132 of IC401? Is PLL locked? Check peripheral circuits (Refer to waveforms.) of IC401 and IC605.
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3-1-2. Location Diagram of Servo Test Point CN501 CN503 CN701 IC503 IC401 IC502 CN502 IC606 IC301 IC605 CN603 IC304 CN601 Fig. 1-3-21 1-44...
SECTION 2 PART REPLACEMENT AND ADJUSTMENT PROCEDURES CAUTIONS BEFORE STARTING SERVICING Electronic parts are susceptible to static electricity and may easily damaged, so do not forget to take a proper grounding treatment as required. Many screws are used inside the unit. To prevent missing, dropping, etc. of the screws, always use a magnetized screw- driver in servicing.
1-1-4. Tray <Tray Panel Removal> 1. Pull out the tray (1) towards you until it stops. 1. Eject the tray (1). (Refer to item 1-1-2.) 2. Lift up claw A with a minus screwdriver, and pull out 2. Twist the tray panel (2) a little in the arrow A direction the tray (1) towards you, then remove the tray (1).
1-2-2. Power PC board 1-2. PC Board Replacement 1. Peel off two tapes (1) and remove the connector (2). 1-2-1. Main PC Board 2. Remove six screws (3) and remove the power supply Note: PC board (4). • Before removing the main PC board (4), be sure to short-circuit the laser diode output land.
1-2-3. Front PC Board 1-3. Mechanism Parts 1. Remove the front panel. (Refer to item 1-1-3.) 1-3-1. Mechanism Chassis Assembly 2. Remove nine screws (1) and remove the front display Note: PC board (2). • When removing the mechanism chassis assembly (3), be sure to short-circuit the laser diode output land Front display PC board (2)
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2. REPLACEMENT OF MECHANICAL PARTS (TYPE B) 2-1. Cabinet Replacement <Mounting > 1. The spring for tray side pressure is inserted into the 2-1-1. Top Cover portion “A”. (Refer to Fig. 2-1-12.) 1. Remove seven screws (1) and remove the top cover (2). 2.
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2-1-3. Tray Panel <Tray Ejection> Tray (1) 1. Slide the slider (2) of the mechanism chassis assembly (1) with a screwdriver, etc. in the arrow direction, so that the tray (3) is ejected. Note: Tray panel (2) • Take care not to damage the pickup and other parts. Tray (1) Claw Tray...
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• Confirm that the mark of the gear matches with the 2-2. PC Board Replacement triangle mark on the reverse side of the tray in the tray 2-2-1. Main PC Board close status. (The gear is rotated with the slider locks.) Note: (Refer to Fig.
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2-2-2. Power PC board 2-3. Mechanism Parts 1. Peel off two tapes (1) and remove the connector (2). 2-3-1. Mechanism Chassis Assembly 2. Remove six screws (3) and remove the power supply Note: PC board (4). • When removing the mechanism chassis assembly (3), Screws (3) be sure to short-circuit the laser diode output land before removing the connector and the flexible cables.
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SECTION 4 PARTS LIST SAFETY PRECAUTION The parts identified by ! ( ) mark are critical for safety. Replace only with part number specified. The mounting position of replacement is to be identical with originals. The substitute replacement parts which do not have the same safety characteristics as specified in the parts list may create shock, fire or other hazards.
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4. EXPLODED VIEWS 4-1. Packing Assembly ZF23 (SD-2550A) ZF23 ZF30 (SD-2550T) ZF10 ZF20 ZF01 ZK04 ZF23 (SD-2550H) ZK02 ZK01 ZK02 Note: The shape of the packing material is sometimes different. Fig. 4-4-1...
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LOCATION PART LOCATION PART NUMBER NUMBER DESCRIPTION NUMBER NUMBER DESCRIPTION - DIODES - - ELECTRICAL PARTS - ! D803 79060087 Diode S1WB(A)60 D805 79060069 Diode HER108G D806 79060070 Diode HT15G EU01 79083125 PC Board Assy Main D807 79060080 Diode AK06 - INTEGRATED CIRCUITS - D808 79060029...
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SPECIFICATIONS DVD Video Player/Outputs/Supplied Accessories [DVD Video Player] Power supply 100-240V AC, 50/60 Hz Power consumption 16 VA Mass 2.3 kg External dimensions 430 x 69 x 224 mm (W/H/D) Signal system PAL/3.58 NTSC Laser Semiconductor laser, wavelength 650/780 nm Frequency range DVD linear sound : 48 kHz sampling 4 Hz to 22 kHz 96 kHz sampling 4 Hz to 44 kHz...
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FILE NO. 810-200207 SERVICE MANUAL DVD VIDEO PLAYER SD-2550A SD-2550H SD-2550T Jun., 2002...
SECTION 3 SERVICING DIAGRAMS 1. STANDING PC BOARDS FOR SERVICING EU02 Power supply PC board EU01 Main PC board EU03 Front display PC board Fig. 3-1-1...
2. CIRCUIT SYMBOLS AND SUPPLEMENTARY EXPLANATION 2-1. Precautions for Part Replacement • In the schematic diagram, parts marked (ex. • Using the parts other than those specified shall violate the regulations, and may cause troubles such as F801) are critical part to meet the safety regulations, operation failures, fire etc.
4. BLOCK DIAGRAMS 4-1. Overall Block Diagram Data/Control Bus DVD AV Data MAIN PROCESSOR UNIT IC402 M11B11664A-30T 1M-DRAM IEC958 Audio Out Tray Motor RF Amp. Optical Feed Interated Data Audio Out Motor IC901 IC912 processor AD1958 NJM4580E IC502 27MHz TA1323F Audio LPF Analog Audio-DAC...
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Front Display, Power Switch Circuit Diagram FRONT EU03 Fig. 3-5-4 3-19 3-20...
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5-3. Main Circuit Diagrams Main ICs Function Table 3-5-1 5-3-1. New Main ICs Information Ref. No. IC Name Function Detail ZR36732 AD1958 IC601 S-24C04BFJ-TB EE-PROM Setup default, memorization of specification setting. IC301 ZR36732 AV Decorder Decryption, MPEG-2 Decode, Audio Decode, Sub Picture Decode, OSD.
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Table 3-5-4 TMP94C251AF(Z) (1/5) Table 3-5-4 TMP94C251AF(Z) (2/5) Name Function Name Function P00~P07 Port 0: I/O port Port 81: Output (initialized to “1” output) D0~D7 Data 0~7: data bus 0~7 Chip select 1: Develops “L” level when the Initialized to this function in the external address is within the assigned address ROM type, TMP94C251A.
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Table 3-5-4 TMP94C251AF(Z) (3/5) Table 3-5-4 TMP94C251AF(Z) (4/5) Name Function Name Function Port B2: Output port (initialized to “1” Port F4: I/O port output) TXD1 Serial transmission data 1 (open drain output is possible) Port B3: Output port (initialized to “1” output) Port F5: I/O port RXD1...
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Table 3-5-4 TMP94C251AF(Z) (5/5) Table 3-5-5 ZR36732 (1/5) Name Function Name Function ADVCC 10 bit AD converter power supply terminal Host interface, CD-DSP interface, sub code interface (32 pins) ADVSS 10 bit AD converter GND terminal (0V) RESET# Reset input (active: low). Initializing process of the device will start when DAVCC 8 bit DA converter power supply terminal...
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Table 3-5-5 ZR36732 (3/5) Table 3-5-5 ZR36732 (2/5) Name Function Name Function VREF Apply reference voltage for DAC gain HRDY Host ready output (active: high). When adjustment. transmitting a stream through host bus with this signal, use the signal. And an external COSYNC Composite sync output.
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Table 3-5-5 ZR36732 (4/5) Table 3-5-5 ZR36732 (5/5) Name Function Name Function SDRAM interface (35 pins) VDDIP 3.3V digital power supply. RAMDAT SDRAM bidirectional data bus. [15:0] GNDAAM GND for PLL power supply of 3.3V AMCLK generation. VDDAAM PLL power supply for 3.3V AMCLK generation.
6. PC BOARDS 6-2. Power Switch PC Board 6-1. Power Supply PC Board Part Loca- Part Loca- tion tion C801 Q801 C802 Q802 C803 Q803 C804 Q804 C805 Q821 C806 Q823 P802 C807 Q824 T801 F801 C808 Q825 C809 Q826 C811 Q827 Fig.
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6-3. Front Display PC Board Fig. 3-6-4 EU03 Front Display PC Board (Top Side) Fig. 3-6-5 EU03 Front Display PC Board (Bottom Side) The parts location list shows ex. A1/B1= top side/bottom side. Part Loca- Part Loca- Part Loca- tion tion tion A101...