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DAEWOO ELECTRONICS DSD-9251MAV Service Manual
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DAEWOO ELECTRONICS DSD-9251MAV Service Manual

Digital satellite receiver
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S/M No. : DSD9251M01
Service Manual
Digital Satellite Receiver
MODEL :DSD-9251MAV/EAV
DSD-9252MA/EA
Caution :
In this Manual, some parts can be changed for improving, their
performance without notice in the parts list. So, if you need the
latest parts information,please refer to PPL(Parts Price List) in
Service Information Center (http://svc.dwe.co.kr).
DAEWOO ELECTRONICS Corp.
http : //svc.dwe.co.kr
June. 2004

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Summary of Contents for DAEWOO ELECTRONICS DSD-9251MAV

  • Page 1 All manuals and user guides at all-guides.com S/M No. : DSD9251M01 Service Manual Digital Satellite Receiver MODEL :DSD-9251MAV/EAV DSD-9252MA/EA Caution : In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr).

  • Page 2: Table Of Contents

    All manuals and user guides at all-guides.com CONTENTS GENERAL INFORMATION....................2 CIRCUIT OPERATION MANUAL .....................7 FIXING ERRORS ........................28 BOM LIST ..........................33 SCHEMATIC DIAGRAM ......................40 PARTS PLACEMENT(ARRANGEMENT) ................53...

  • Page 3: General Information

    All manuals and user guides at all-guides.com GENERAL INFORMATION Digital Satellite Receiver is easy to use, and allows you to watch digital programs broadcasted via satellite. This instruction manual will guide you through the initial installation of your receiver. It also describes how to take full advantage of a wide range of features that are easily accessible. Read this instruction manual carefully before installing your receiver.
  • Page 4 All manuals and user guides at all-guides.com GENERAL INFORMATION FOR YOUR SAFETY • Allow clear space of more than 10 cm from the top, back and both sides for sufficient ventilation. • Do not cover the Digital Satellite Receiver nor place it on a unit that emits heat. •...
  • Page 5 All manuals and user guides at all-guides.com GENERAL INFORMATION Remote Control Switches between the operational mode and Stand-by mode of the receiver Switches between TV and AV mode Used for various functions on some menu Displays the menu on the screen Change channel, or moves to the next higher or lower item in the menu Adjusts the volume, or moves to the left...
  • Page 6 All manuals and user guides at all-guides.com GENERAL INFORMATION FRONT PANEL Changes the channel or moves to the previous/next item in the menu Switches between the operational mode and 2 CI Slot for conditional access stand-by mode module (CAM) OK button Opened Front Door FRONT PANEL DISPLAY REMOTE led...
  • Page 7 All manuals and user guides at all-guides.com GENERAL INFORMATION Product Specification TRANSMISSION STANDARDS DVB, MPEG2 LNB/TUNER INPUT Connector IEC 169-24, Female-type Input Frequency 950 ~ 2150MHz Demodulation 2 Msps ~ 35Msps Code rate QPSK Max Current 400mA Supply Voltage 13V/18V DiSEqC 1.0, 1.2, USALS SYSTEM RESOURCES...

  • Page 8: Circuit Operation Manual

    All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL 1. Block Diagram DSD-9251EAV Block Diagram...
  • Page 9 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL 2. Interface (1) Remote controller Interface • KEY FUNCTION TABLE " POWER " CUSTOM CODE : E8 H DATA CODE : 15 H KEY NO KEY NAME CUSTOM CODE(H) DATA CODE(H) CUSTOM CODE(B) DATA CODE(B) E8 H...
  • Page 10 All manuals and user guides at all-guides.com CIRCUIT OPERATING MANUAL Key Function Key Function Custom Code 0xE8 Pg DOWN 0x1D 0x00 Pg UP 0x1C 0x01 0x14 0x02 0x13 0x03 MENU 0x22 0x04 EXIT 0x23 0x05 TV/RADIO 0x0A 0x06 RECALL 0x20 0x07 INFO 0x21...
  • Page 11 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL 3. Peripheral device of STi5518 (1) Structure Block move Block move ST20 ST20 2 MPEG 2 MPEG DMAs DMAs Serial Interrupt Interrupt Serial IEEE 1394 IEEE 1394 controller controller SDAV SDAV interface interface...
  • Page 12 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL (2) Reset Section. If the Low signal is read by Sti5518 Reset Pin, the Register value of all Sti5518 will be initialized. There must be at least of 8 clock (37nsec) of Reset Time. not_Rst tRSTLRSTH Min 8x37nsec...
  • Page 13 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL This section only provides summaries of individual function of each Port. Further discussion will be followed in individual port section. C_DATA (PIO1_0) C_CLK (PIO1_2) Used for the transmission of Serial and control of Tuner, CI-Max, AV Switch and RF Modulator. ClkPolarity ClkPhase Serial clock SCIK Plns MTSR/MRST...
  • Page 14 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL NOTPGM_EN (PIO1_3) Flash ROM Write protect/ Program enable (Low) or Program disable (High) SLOW_S/W (PIO1_4) Checking the connection of external features with Vcr scart such as VCR and general power on/off status. Connect and power on(High), Not connect or power off(Low) RS232_Tx (PIO1_5) RS232_Rx (PIO1_6)
  • Page 15 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL Following is the Memory MAP Table. 0x7FFFFFFF EMI Bank 3 (FLASH) 0x70000000 EMI Bank 2 0x60000000 EMI Bank 1 0x50000000 EMI Bank 0 0x40000000 0x20040000 Peripheral configuration registers 0x00000000 Not available 0xC0360000 Shared SDRAM 0xC0000000...
  • Page 16 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL MemWait Wait signal is produced in external device when accessing SRAM and peripheral devices. Wait signal is maintained as Order status in the High status motivated by processor clock. Not_OE Read Strobe ReadnotWrite The ability to Read or Write of processing cycle.
  • Page 17 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL EMI Interface Timing...
  • Page 18 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL 4. Front-End Interface (1) Tuner Module Tuner and QPSK Demodulator are combined into one Module. Following feature shows the Block Diagram.
  • Page 19 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL PIN NO MARK DESCRIPTION CURRENT RIPPLE(MAX) LNB A POWER INPUT OF LNB A 5V(RF) 5V OF RF-AMP 20mA(TYP.) 20mVp-p AGC MONITORING 5V OF 2’nd AMP & ZERO-IF IC 20mA(TYP.) 20mVp-p TUNING VOLTAGE 30V 20mVp-p I SIGNAL MONITORING...
  • Page 20 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL Serial Output Timing STA R T RS0 = 0 Bi t CLK RS0 = 1 Data Parity P A C K E T First bit of the packet Useful Data Parity E R R O R 1 Packet...
  • Page 21 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL 2) Loop Through Supports Loop Through for the Interface function of other Satellite Devices. That means, in other Satellite device, the control of LNB related voltage and Tone are possible. If the signal of AUX/IRD Control is in High status, the LNB voltage is provided from LNBP.
  • Page 22 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL 3) Color Bar CVBS, Y, C, signals 32.88 1.233 28.88 1.000 WHITE LEVEL Color Burst (10 Cycles) 12.01 0.450 BLACK/BLANK 0.300 8.00 LEVEL 4.00 0.150 0.068 1.80 SYNC IFVFI 26.68 1.000 WHITE LEVEL Maintain...
  • Page 23 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL 1-4) Video Output There are 2 Video Output Port in the DSD-9251EAV products. (TV Scart, RCA JACK) The output of R,G and B signals are sent to TV Scart through Video Buffer and LPF (Low Pass Filter) originated from the STI5518 output.
  • Page 24 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL Name Description Singnal Level Impedance 0.5 Vrms Audio Out Right <1k ohm 0.5 Vrms Audio In Right >10k ohm 0.5 Vrms Audio Out Left + Mono <1k ohm AGND Audio Ground B GND RGB Blue Ground 0.5 Vrms...
  • Page 25 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL 1/ f LRCK L- channel R-channel (= 4 8f or 64 f DATA N-1 N N-1 N MS B MS B PCM Timing Analogue Audio Signals that are modified at Audio DAC are amplified by three times after going through Low Pass Filter.
  • Page 26 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL 6. Software Operating Steps (1) Operating Steps. A. Initialize multi-purpose PIO port B. STI5518 chip version detection C. Set DMT default multi-purpose PIO port D. Initialize the OS20 software scheduler E.
  • Page 27 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL --- DEVELOP driver configuration --- [UARTIO fitted] [UNHOSTED NOT fitted] [STREPORT fitted] --- MPEG driver configuration --- [B_ON_THE_FLY fitted] [ENABLE_AVSYNC fitted] [DONT_BLOW_UP_HALF_SIZE_PICTURES NOT fitted] [BUILT_FOR_16MBIT fitted] [DECODE_ELEMENTARY_STREAM NOT fitted] [SIF_UPSAMPLING_WORKAROUND NOT fitted] 2) I2C driver initialized message I2C driver initialized...
  • Page 28 All manuals and user guides at all-guides.com CIRCUIT OPERATION MANUAL 7) Teletext Driver & Process Start Teletext driver library v1.0 - Version of Apr 04 2000 at 01:34:03 Creating Teletext VBI task (priority=9) The teletext_data_transfer task is running Creating Teletext STB Page Filter task (priority=9) The ttx_stb_page_filter task is running Creating Teletext Handler task (priority=9) teletext_handler task is running...

  • Page 29: Fixing Errors

    All manuals and user guides at all-guides.com FIXING ERRORS 1. BOOTING LED ERROR (1) No response of Display Boot signal. Start No Display LED signal. Power on? Modify Power status. Check Reset Circuit. Is Reset IC working? Check 27Mhz Crystal and Oscillating 27Mhz clock? other peripheral circuit.
  • Page 30 All manuals and user guides at all-guides.com FIXING ERRORS 2. Poor quality screen 2. Poor quality screen (1) Locking Error 30V, 3V3 voltage OK? Replace the SMPS Check the power status of tuner(30V, VCC_TUNER,3V3) Replace Q808. Tr(Q808)OK?(VCC_TUNER) LNBP output OK?(IC27 Check the power of LNBP Input control? PIN3)
  • Page 31 All manuals and user guides at all-guides.com FIXING ERRORS (2)Disabled screen after Locking Check the 3.3V power of Fix the problem Tuner(Ripple, Voltage) Check Error Pin.(Whether Replace Tuner the output is in High Status.) Tuner interface Signal check? (TS_Data, F_packet_clk, F_strt, F_B_clk) Fix the problem.
  • Page 32 All manuals and user guides at all-guides.com FIXING ERRORS 3. Errors In Audio and Video 3. Errors in Audio and Video (1) AUDIO ERROR Eliminate problems Check the power status of Audio DAC Check the STi 5518 Replace STi5518 Check the Input Signal PCM Data, SCLK, LRCLK, Check the Interface OF Replace Audio DAC...
  • Page 33 All manuals and user guides at all-guides.com FIXING ERRORS (2) VIDEO ERROR LED Booting OK Video buffer, Low Pass Confirm and execute the STi5518 CVBS out check Filter Check fixing process Pin34 Confirm the connection status of tracking port and execute the fixing process Check the power status of Check Related Circuits and execute the...

  • Page 34: Bom List

    D100 97P1R9ABA0 REMOCON HANDSET AS VR-F9ABA0 BK080A(AAA) C204 HCBK104KBA C CHIP CERA 50V X7R 0.1MF K 1608 97PP343000 PANEL FRONT AS DSD-9251MAV C206 HCBK104KBA C CHIP CERA 50V X7R 0.1MF K 1608 Z03A 7174300811 SCREW TAPPTITE TT2 RND 3X8 MFZN...
  • Page 35 All manuals and user guides at all-guides.com BOM LIST PART CODE PART NAME PART DESC REMARK PART CODE PART NAME PART DESC REMARK C415 HCQK391JBA C CHIP CERA 50V CH 390PF J 1608 C735 HCBK104KBA C CHIP CERA 50V X7R 0.1MF K 1608 C416 HCQK101JBA C CHIP CERA...
  • Page 36 All manuals and user guides at all-guides.com BOM LIST PART CODE PART NAME PART DESC REMARK PART CODE PART NAME PART DESC REMARK Q506 TKTN2907 KTN2907 R143 HRFS470JBA R CHIP 1/16 47 OHM J 1608 Q507 T2SC5343SF TR CHIP 2SC5343SFG-DAG R144 HRFS470JBA R CHIP...
  • Page 37 All manuals and user guides at all-guides.com BOM LIST PART CODE PART NAME PART DESC REMARK PART CODE PART NAME PART DESC REMARK R334 HRFS103JBA R CHIP 1/16 10K OHM J 1608 R509 HRFS681JBA R CHIP 1/16 680 OHM J 1608 R335 HRFS103JBA R CHIP...
  • Page 38 All manuals and user guides at all-guides.com BOM LIST PART CODE PART NAME PART DESC REMARK PART CODE PART NAME PART DESC REMARK R625 HRFS121JBA R CHIP 1/16 120 OHM J 1608 C420 CEXE1C101E C ELECTRO 16V RM 100MF 5X11 R626 HRFS221JBA R CHIP...
  • Page 39 All manuals and user guides at all-guides.com BOM LIST PART CODE PART NAME PART DESC REMARK PART CODE PART NAME PART DESC REMARK AP01 2193100801 SOLDER WIRE SN:PB=63:37 3PI(NO FLUX) L803 56C220K695 COIL CHOKE(CAP TYPE) 22UH K 9X11.1 (CAP TYPE) AP02 2193011100 SOLDER WIRE...
  • Page 40 All manuals and user guides at all-guides.com BOM LIST PART CODE PART NAME PART DESC REMARK PART CODE PART NAME PART DESC REMARK AJ02 2193011100 SOLDER WIRE 60 SNA 1.2D DSD-9252 JK602 97P0S03000 JACK SENSOR OPTIC VST5B-12M D103 D1N4004SRT DIODE 1N4004SRT P602 97P62K04E9...

  • Page 41: Schematic Diagram

    All manuals and user guides at all-guides.com SCHEMATIC DIAGRAM...
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  • Page 54: Parts Placement(Arrangement)

    All manuals and user guides at all-guides.com PARTS PLACEMENT(ARRANGEMENT)
  • Page 55 All manuals and user guides at all-guides.com PARTS PLACEMENT(ARRANGEMENT)
  • Page 56 All manuals and user guides at all-guides.com PARTS PLACEMENT(ARRANGEMENT) 9252 FRONT PCB...
  • Page 57 All manuals and user guides at all-guides.com PARTS PLACEMENT(ARRANGEMENT) 9251 FRONT PCB...
  • Page 58 All manuals and user guides at all-guides.com PARTS PLACEMENT(ARRANGEMENT)
  • Page 59 All manuals and user guides at all-guides.com DAEWOO ELECTRONICS Corp. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA...

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