Daewoo DSD-9251MA Service Manual Download Page 7 | Manualshive

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6

. CIRCUIT OPERATING MANUAL

1. Block Diagram

D

S

D-

9230

E

BLOCK DIAGRAM

D

S

D

-

9251MA

Block Diagram

CPU

(STi5518)

AUDIO D/A

FLASH

ROM

(4Mbit)

SDRAM

(32Mbit)

Television

Satellite dish

TUNER

A/D

6bit

DUAL

LINK IC

QPSK

FEC

RCA

CON

TV

SCART

RCA

R

S

-232

PORT

AV

S/W

(MM1232)

VIDEO

AUDIO

FRONT

SMPS

+5V

+3.3V

+12V

+30V

+ 22V

+ 7.5V

Digital

Audio

Converte

r

(TDA1315)

RCA

Interface

I

2

C BUS

POSITIONER

& SKEW

Feature 1. Block Diagram

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Summary of Contents for DSD-9251MA

Page 1: ...Broadcasting Digital V Video DSD 9251MA DSD 9251MA D I G I T A L Digital Satellite Receiver CHASSIS SD 240V Model DSD 9251MA OCT 2003 S M No DSD240VEF0...

Page 2: ...3 7 Remote Control 3 8 Front Panel 4 9 Rear Panel 4 10 Product Specification 5 CIRCUIT OPERATING MANUAL 1 Block Diagram 6 2 Interface 7 3 Peripheral device of STI 5518 10 4 Front End Interface 17 5 A...

Page 3: ...S RGB Provide various switch types LNB types and NTSC PAL monitor type SCPC MCPC Receivable from C Ku Band Satellite Multi LNB controlled by DiSEqC 1 0 DiSEqC 1 2 and 22KHz switching 256 colors On Scr...

Page 4: ...enu When watching adjusts the volume or moves to the left or right item in menu Moves up down a page in the channel list PAUSE Press once to freeze the screen picture Press once again to go to the nor...

Page 5: ...item Broadcasting Digital V Video DSD 9251MA DSD 9251MA D I G I T A L CAUTION 90 250V 50 60Hz 30W VIDEO R _ AUDIO L _ AUDIO LNB IN LNB OUT _ RS 232 TV 13 18V Max 500mA CONNECT TO TV AND RS232 CONNECT...

Page 6: ...byte Graphic display 720 x 576 PAL 720 x 480 NTSC Connector Summary LNB 1 x LNB input F type 1 x LNB output F type Loop through Option RCA 4 x RCA jacks CVBS Audio L R SCART 1 Scart TV RS232 1 x 9 pin...

Page 7: ...5518 AUDIO D A FLASH ROM 4Mbit SDRAM 32Mbit Television Satellite dish TUNER A D 6bit DUAL LINK IC QPSK FEC RCA CON TV SCART RCA RS 232 PORT AV S W MM1232 VIDEO AUDIO FRONT SMPS 5V 3 3V 12V 30V 22V 7 5...

Page 8: ...ents of the display Key Scan Method Perform the Low Scan using the Key Output Port KO0 7 with the cycle of 64ms If the Key is pressed the Key Input Port will recognize the status as low eventually lea...

Page 9: ...gnal of the IR sensor MITSUBISH formats were used for the REMOCON signal Following is the Timing Diagram for the MITSUBISH signal format The signals are made up of Leader Code Custom Code 8bit Separat...

Page 10: ...0 ALT AUDIO 0x0E TV RADIO 0x0A TXT 0x25 PR 0x20 UHF 0x26 MENU 0x22 3 Display Interface The signal that controls the Segment of 7 Segment is used with the signal of Key Scan as mentioned above in Key I...

Page 11: ...ternal AC3 Decoder Supporting 2 8bit pixel OSD Internally stored Video Encoder for the output of RGB CVBS and Y C Video Enhanced CPU and Decoder capability boosted by 64Mbit SDRAM Backing External Sur...

Page 12: ...value is not appropriate the colors are not be seen on the screen or the screen will display broken features 4 PIO Structure Sti5518 supports PIO that back up 5 number of Ports 8bit as of PIO0 PIO1 PI...

Page 13: ...Shift data Latch data Transmit data Feature 7 I2 C Timing Chart 3 PIO Map PIO NAME I O Function Remarks PIO1_0 I2C_Data SSC0 I O PIO1_2 I2C_Clk O PIO1_3 NOTPGM_EN O L Flash program enable PIO1_4 SLOW_...

Page 14: ...h status and Key Scan Trigger IN PIO3_6 Trigger OUT PIO3_7 Used when debugging with DCU Tool REMOCON_IN PIO4_6 Recognize the REMOCON signal being sent from IR Sensor 5 Memory Interface Sti5518 can sup...

Page 15: ...SRAM Not available Feature 8 Memory Map The size of EMI Bus is 16bit and also support for the 8bit Bus The Bank0 of EMI can support DRAM Interface while rest of Bank as of Bank1 2 and 3 can only supp...

Page 16: ...ce Clock high to Strobe Valid 8 0 0 0 ns tRCA CH Read Data valid to Reference Clock high 13 0 ns tCHRDX Read Data hold after Reference Clock high 2 0 ns tSVRDX Read Data hold after Strobe valid 0 0 ns...

Page 17: ...16 CIRCUIT OPERATING MANUAL Feature 9 EMI Interface Timing...

Page 18: ...lock Diagram RF INPUT A 95 0 21 50 VDD 3 3 V NRES SDA SCL B3 5 V AMP RF ATT BPF AMP Q PS K L i n k IC STV0299B SDAT Lo op Through Output 95 0 21 50 B2 5 V ZERO IC wi t h PLL TUN 30V B1 5 V SCLT DA TA...

Page 19: ...e Output Clock F22 DiSEqC 14 DiSEqC modulation 22kHz Tone Programmable Output Port SCL 15 I2C Bus SDA 17 N C 16 Do not connect it to anywhere BCLK OUT 18 Output Byte Clock or Bit Clock in Serial Mode...

Page 20: ...ds the 22Khz Tone signal that is used in horizontal 18V vertical 13V and frequency Band and Diseqc Command UNI CI Model uses LNBPIO series that are exclusive IC for the LNB from ST company Control sig...

Page 21: ...ncoder output supports Interlace mode or Non interlace mode There are 6 Pins for the Analogue Video output CVBS RGB Moreover it supports Teletext closed captions and CGMS Following picture shows the s...

Page 22: ...0 0 000 White Yellow Cyan Green Magenta Red Blue Block 400 388 316 284 238 204 152 BLACK BLANK WHITE LEVEL LEVEL SYNC IFVFI Color Burst 10 Cycles Maintain 300mV Maintain 300mV White Yellow Cyan Green...

Page 23: ...ual output mode of TV SCART RF_MODULATOR and RCA JACK through the Video Buffer and LPF There are two control signals as of Fast Blanking and Slow Blanking in TV SCART Chart 9 shows the usage of contro...

Page 24: ...DAC systems CS4331 Crystal UDA1330 Philips Following diagram shows Timing Diagram with Audio DAC and Philips UDA1330 Block Pin Name Description Signal Level Impedance 1 AOR Audio Out Right 0 5 V rms 1...

Page 25: ...BCKIN pin 3 AUDIO DATA WORD 16 BIT DIN pin 2 Feature 11 PCM Timing Analogue Audio Signals that are modified at Audio DAC are amplified by three times after going through Low Pass Filter The output is...

Page 26: ...ash Memory Program Check System Upgrade by another DSR or PC Factory Default Data read write by PC 2 sign is displayed in Front Panel Check whether the User Data is being loaded to Main RAM from the F...

Page 27: ...r Initial TUNER Module Initialization Creating TUNER module semaphores module_type 148 Successfully Installed TUNER module 5 MPEG SDRAM configuration MPEG SDRAM configuration Video Bit Buffer Size 400...

Page 28: ...serivce_num 0 LOAD POSt parsing process start LOAD POSt parsing process start LOAD POSt parsing process start LOAD POSt parsing process start LOAD POSt parsing process start Last Channel didn t save b...

Page 29: ...h ROM SDRAM Buffer Check all BUS and control signal Check MEMCLK SDRAM PIN38 121MHz Check Reset Circuit Check 27Mhz VCXO and other peripheral circuit Check CPU power STi5518 Pin27 High Check ROM Booti...

Page 30: ...I2C_Clk normal Check I2C related parts STI5518 Tuner RF Mod Replacing STi5518 Verify and eliminate the problem causing parts Memwait High STi5518 Pin131 Ci Max IC check Replacing Ci Max STi5518 to Ci...

Page 31: ...the power of LNB 13V 18V LNBP output OK IC27 PIN3 Relay Control OK LNBP Input Control Eliminate problem causing factors Replace LNBP Tr 547 Q45 Aux Ird Path Check Replace Relay I2C Line Check Reset C...

Page 32: ...No Yes Yes Tuner interface Signal check TS_Data F_packet_clk F _strt F_B_clk Fix the problem No No PtS Crystal Check No Stream Input Signal check Link_Data Link_B_clk Li nk_val F_error CI Max Check P...

Page 33: ...RTS LIST CASE CI CAM Detection C Power Check VCC Fix the Problem PCMCIA Bus Interface Check Ci Data Ci_Addr Control No No Yes No Yes Check CAM Interface signal MDIA B MDOA B Control Signal Fix the Pro...

Page 34: ...oblems Check the Input Signal PCM Data SCLK LRCLK PCMCLK Check the STi5518 Check the Interface OF Audio AMP IC No Yes No Replace STi5518 No Yes No Replace Audio DAC Yes Eliminate problems No Audio AMP...

Page 35: ...e connection status of tracking port and execute the fixing process Yes Check Related Circuits and execute the fixing process Replace STi5518 I V Ref Check STi5518 Pin28 29 Pin35 36 Verify the resista...

Page 36: ...7 CX8 CX9 CX10 CX11 CX12 CX13 CX22 CX23 CX80 14 C CHIP CERA 1uF 50V 80 20 Size 1 6 0 8mm C1608Y5V1A105Z 1 C244 15 C ELECTRO 1uF 50V 20 Size 5 11 RSS CEXF1H109V 4 C273 C274 C275 C276 C ELECTRO 4 7uF 50...

Page 37: ...W 1K ohm J 5 Size 1 6 0 8mm 18 R36 R37 R54 R145 R147 R152 R183 R184 R186 R211 R215 R220 R232 R233 R238 R266 RX32 RX33 48 R CHIP 1 10W 2 2K ohm J 5 Size 1 6 0 8mm 14 R22 R23 R85 R89 R97 R101 R107 R129...

Page 38: ...Q30 Q31 Q35 Q36 Q37 Q41 Q42 Q45 Q47 Q48 Q49 78 TR Audio power Amplifier PNP High current 2A STB1277YAT 1 Q77 TR CHIP KTA1663 Y RTF PNP KTA1663 2 Q1 Q2 TR CHIP KRC111S RTK NPN KRC111S 2 Q3 Q4 79 IC CH...

Page 39: ...LVC373AD 2 ICX2 ICX3 115 IC CHIP CI controller IC CIMAX 2 0 1 ICX1 116 PCMCIA PCMCIA SLOT 007222TF40A 1 PX1 FRONT PCB 1 PCB Front FR 1 1Layer 49 x 191 1 UNIT DSD9250_FRONT 1 A001 2 TR PNP General Smal...

Page 40: ...39 39 SCHEMATIC DIAGRAM...

Page 41: ...40 40 SCHEMATIC DIAGRAM...

Page 42: ...41 41 SCHEMATIC DIAGRAM...

Page 43: ...42 42 SCHEMATIC DIAGRAM...

Page 44: ...43 43 SCHEMATIC DIAGRAM...

Page 45: ...44 44 SCHEMATIC DIAGRAM...

Page 46: ...45 45 SCHEMATIC DIAGRAM...

Page 47: ...46 46 SCHEMATIC DIAGRAM...

Page 48: ...47 47 SCHEMATIC DIAGRAM...

Page 49: ...48 48 SCHEMATIC DIAGRAM...

Page 50: ...49 49 SCHEMATIC DIAGRAM...

Page 51: ...50 ELECTRICAL PARTS LIST 50...

Page 52: ...51 51 EXPLODED VIEW...

Page 53: ......

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