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Toshiba 21E88, Service Manual

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Toshiba 21E88 Service Manual Download Page 46

SERVICE MANUAL 

3. TDA8944J 

2 X 7 W STEREO BRIDGE TIED LOAD (BTL) AUDIO AMPLIFIER 

 

1). General descriptio

n 

The TDA8944J is a dual-channel audio power amplifier with an output power of 
2 

× 

7 W at an 8 

Ω 

load and a 12 V supply. The circuit contains two Bridge Tied Load 

(BTL) amplifiers with an all-NPN output stage and standby/mute logic. The TDA8944J 
comes in a 17-pin DIL-bent-SIL (DBS) power package. The TDA8944J is 
printed-circuit board (PCB) compatible with all other types in the TDA894x family. 
One PCB footprint accommodates both the mono and the stereo products. 
 

2). Features 

❷ 

Few external components 

❷ 

Fixed gain 

❷ 

Standby and mute mode 

❷ 

No on/off switching plops 

❷ 

Low standby current 

❷ 

High supply voltage ripple rejection 

❷ 

Outputs short-circuit protected to ground, supply and across the load 

❷ 

Thermally protected 

❷ 

Printed-circuit board compatible. 

 

3). Block diagram

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig 18. Block diagram.

 

 

44

Summary of Contents for 21E88

Page 1: ...SERVICE MANUAL FILE NO SM CTV O 081 COLOR TELEVISION SERVICE MANUAL MODELNO 21E88 CHASSIS NO CN 18EA Please read this manual carefully before service ...

Page 2: ...CIRCUIT ADJUSTMENTS 8 CONTROL BUTTONS 23 CONTROL BUTTONS 23 REMOTE CONTROL 24 BASIC FUNCTIONS 25 STRUCTURE AND CHASSIS FUNCTION DESCRIPTION 28 STRUCTURE BLOCK DIAGRAM 28 BLOCK DIAGRAM FOR SUPPLY VOLTAGE SYSTEM 29 CHASSIS DESCRIPTION 30 SERVICE DATA 31 TECHNICAL DATA OF KEY ICS 31 SERVICE DATA OF KEY ICS 55 REPLACEMENT OF PARTS 60 APPENDIX 1 CIRCUIT DIAGRAMS 2 FINAL ASSEMBLY DIAGRAMS 3 FIND WIRING ...

Page 3: ... 58 NTSC4 43 50 60Hz Programs preset 236 0 235 Antenna input 75Ω unbalanced Picture tube Effective screen dimensions Approx 406 305mm Audio output THD 7 Main channel 3W 3W Power source 220V 50Hz Weight Approx 23 Kg Dimensions W H D Approx 585 457 484mm Rated power consumption 87W Designs and specifications are subject to change without notice 1 ...

Page 4: ...TICE below 4 Service and adjustment of the TV may result in changes in the nominal EHT voltage of the CRT anode So ensure that the maximum EHT voltage does not exceed the rated value after service and adjustment SAFETY PRECAUTION WARNING REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY 1 The TV has a nominal working EHT voltage Extreme caution should be exercised when working on the TV with the...

Page 5: ...ese characteristics are often passed unnoticed by a visual inspection and the X ray radiation protection afforded by them cannot necessarily be obtained by using replacements rated at higher voltages or wattage etc Components which have these special safety characteristics in this manual and its supplements are identified by the international hazard symbols on the circuit diagram and parts list Be...

Page 6: ...nts identified by the VDE marking have special safety related characteristics MAINTENANCE 1 Place the TV set on a stable stand or base that is of adequate size and strength to prevent it from being accidentally tipped over pushed off or pulled off Do not place the set near or over a radiator or heat register or where it is exposed to direct sunlight 2 Do not install the TV set in a place exposed t...

Page 7: ...et 1 3 Operate the TV for at least 15 minutes 1 4 Degauss the TV set using a specific degaussing coil 1 5 Set the brightness and contrast to maximum 1 6 Counter clockwise rotate the R B low brightness potentiometers to the end and rotate the green low brightness potentiometer to center 1 7 Receive green raster pattern signals 1 8 Loosen the clamp screw holding the deflection yoke assembly and slid...

Page 8: ...5 Adjust two tabs of the 6 pole magnet to superimpose red blue line and green line 2 1 6 Remember red and blue movement Repeat steps 2 1 3 2 1 5 until optimal convergence is obtained 2 2 Circumference convergence adjustment 2 2 1 Loosen the clamp screw holding the deflection yoke assembly and allow it tilting 2 2 2 Temporarily put the first wedge between the picture tube and deflection yoke assemb...

Page 9: ...ten the lamp screw holding the deflection yoke assembly Fig 2 4 pole Magnet Movement 6 pole Magnet Movement Center Convergence by Convergence Magnets Incline the Yoke Up or Down Incline the Yoke Right or Left Circumference Convergence by DEF Yoke Fig 3 3 White Balance Adjustment Generally white balance adjustment is made with professional equipment It s not practical to get good white balance only...

Page 10: ...eat the above steps until the TV is degaussed completely 2 Confirmation and Adjustment for Voltage Caution B voltage has close relation to high voltage To prevent X ray radiation set B voltage to the rated value 2 1 Make sure that the supply voltage is within the range of the rated value 2 2 Connect a digital voltmeter to the voltage output terminal of the main PCB Power on the TV and set the brig...

Page 11: ... 0 3Vrms 4 Focus Adjustment Caution Dangerously high voltages are present inside the TV Extreme caution should be exercised when working on the TV with the back removed 4 1 After removing the back cover look for the FBT on the main PCB There should be a FCB on the FBT 4 2 Power on the TV and preheat it for 15 min 4 3 Receive a normal TV signal Rotate knob of the FCB until you get a sharp picture B...

Page 12: ...ontrol Caution The user service mode adjustment can be changed only when service personnel adjust the whole set data during servicing As the control data have dramatic effects on functions and performance of the TV service personnel should not tell user how to enter the SERVICE mode to avoid improper data settings 6 2 Adjustments and bus data CH08T0603 Table 3 Function Description for Bus Data Bit...

Page 13: ...NTSC options 0 No 1 Yes Bit4 Power on message display 1 Yes 0 No Recommended Bit 3 NICAM sound with MDB 0 No 1 Yes Bit 2 Mono system 1 Yes 0 No Bit 1 Single language 1 Yes 0 No MODE2 Bit 0 TA1343 woofer or MDB output mode options 0 Mono output 1 Overlapped to main channel Recommended BIT 7 Childlock vertical bug processing 0 Yes Recommended 1 No BIT 6 Horizontal AFC bug processing 0 Yes Recommende...

Page 14: ...0 No 1 Yes BIT 4 MSP3410G option NICAM 0 No 1 Yes BIT 3 NJW1161 option SRS IC 0 No 1 Yes BIT 2 NJW1160 option BBE IC SRS IC 0 No 1 Yes BIT 1 NJW1137 option BBE IC 0 No 1 Yes MODE4 BIT 0 Soft IIC option 0 No 1 Yes Bit 7 No use Bit 6 VCO adjustments 0 PIF VCO functions PIFVCO 10 during auto search and search 1 PIFVCO 10 during turn on and PIFVCO 00 in Normal mode Bit 5 No use Bit 4 Large amplitude A...

Page 15: ...V B drive CNTX Contrast Max BRTC Bright center COLC Color center for NTSC TNTC Tint center for NTSC TNTCAV Tint center in VIDEO mode for NTSC COLP Color center for PAL COLS Color center for SECAM DCOL DVD color SCOL Sub color center for DVD SCNT Y sub contrast CNTC Contrast center CNTN Contrast Min BRTX Bright Max BRTN Bright Min COLX Color Max continued 13 ...

Page 16: ... SHPN Sharpness Min TXCX Text RGB in user contrast Max RGCN Text RGB in user contrast Min Bit 5 Y peak limiter 0 Off 1 On Bit 4 OSD ABL 0 Active 1 Inactive Bit 3 2 ABL start point 00 ABL start point 0V 01 0 15V 10 0 30V 11 0 45V ABL Bit 1 0 ABL gain 00 0 2V 01 0 4V 10 0 6V 11 0 8V Bit 7 Blank SW 0 H V blanking on 1 H V blanking off Bit 6 Bit 5 4 OSD level 00 OSD level 80 IRE 01 70IRE 10 60IRE 11 5...

Page 17: ...DL 000 40 nsec 001 0 010 40 nsec 011 80 nsec 100 120 nsec 101 160 nsec 110 200 nsec 111 240 nsec DEF BIT0 0 V AGC reference depends on YC VCC BIT0 1 V AGC reference depends on integrated regulator SECD No use HPOS 50hz horizontal phase 00 3usec 10 01F 3usec VP50 V phase 50Hz 0 V phase delay 0H 7 7H HIT V size 00 50 20 0 3F 50 HPS Adjusting difference between horizontal centers in PAL and NTSC VP60...

Page 18: ...DPCS No use HIT69 Vertical amplitude in 16 9 mode PAL DPC69 No use HIT69S Vertical amplitude in 16 9 mode NTSC DPC69S No use KEY No use KEYS No use WID No use WIDS No use ECCT No use ECCB No use VEHT No use HEHT No use SBY Use in SECAM SRY Use in SECAM BRTS Sub bright difference RFAGC RF AGC 00 IF mute 01 65dBu 3F 100dBu continued 16 ...

Page 19: ...ume output data at 100 Woofer TA1343 woofer Max STAT No use Bit 7 VCO readjust when position select 0 Enable 1 Disable Bit 2 N buzz cancel 0 Nyquist buzz cancel on 1 Off Bit 1 AFT window SW 0 Wide 250kHz AFT sensitivity for channel search 1 Narrow 83kHz for normal operation FLG0 Bit 0 Over modulation 0 Normal 1 PIF over modulation switch on Bit 5 MIX gain 0 SIF 1MHz convert gain low gain 1 High ga...

Page 20: ... 11 VCD standby STBY Bit 1 0 IF standby 00 Normal 01 Normal 10 Normal 11 IF standby SVM No use SVM1 No use SVM3 No use BIT 3 2 V blanking stop point 00 310H 50hz 263H 60hz 01 299H 50hz 254H 60hz 10 295H 50hz 250H 60hz 11 291H 50hz 246H 60hz VBLK BIT 1 0 V blanking start point 00 23H 50hz 22H 60hz 01 33H 50hz 30H 60hz 10 37H 50hz 34H 60hz 11 41H 50hz 38H 60hz VCEN Vertical centering 00 32 20 0 3F 3...

Page 21: ...L1 Woofer in MUSIC mode set BAS2 Bass in NEWS mode set TRE2 Treble in NEWS mode set WFL2 Woofer in NEWS mode set BAS3 Bass in THEATRE mode set TRE3 Treble in THEATRE mode set WFL3 Woofer in THEATRE mode set WON1 TA1343 Max woofer setting The bigger the setting the smaller Max woofer WON2 Woofer liner set FVOL Prescale FM AM No use in simple version NVOL Prescale NICAM No use in simple version EVOL...

Page 22: ...345 NICAM chip five equalizer data when the sound mode set to NEWS No use in simple version B21 for 120Hz B22 for 500 Hz B23 for 1 5KHz B24 for 5KHz B25 for 10KHz EQU3 12 345 NICAM chip five equalizer data when the sound mode set to THEATRE No use in simple version B31 for 120Hz B32 for 500 Hz B33 for 1 5KHz B34 for 5KHz B35 for 10KHz BBE Highest four bits BBE Low contour 0dB to 15dB Lowest four b...

Page 23: ...nfiltered 01 hex a complementary high pass is processed in the loud speaker output channel 02 hex MDB is set to OVERLAP mode Table 5 Bus Data item data item data item data item data MODE0 3D GDRV 40 CLTS 40 BSNS 00 MODE1 1F BDRV 40 CLVO 65 MOD 40 MODE2 09 CNTX 7F CLVD 60 STBY 00 MODE3 18 BRTC 40 DEF 01 SVM 00 MODE4 90 COLC 40 AKB 00 VBLK 00 LANG 03 TNTC 48 SECD 18 VCEN 16 BBE 9C TNTCAV 48 HPOS 0C ...

Page 24: ... WFL1 64 EQU31 32 SV4 30 V01 37 WFL2 00 EQU32 4B SVD 30 V25 60 WFL3 64 EQU33 32 ASSH 07 V50 6F WON1 01 EQU34 4B SHPX 3F V100 7F WON2 00 EQU35 32 SHPN 20 woofer 60 FVOL 0A OSDF 64 TXCX 3F STAT 00 NVOL 5F OSD 20 RGCN 1F FLG0 06 EVOL 18 OPT 60 ABL 37 FLG1 08 NICL 0A RCUT 40 DCBS 13 REFP 00 NICH 17 GCUT 38 CLTO 66 RSNS 00 NOIS 01 BCUT 35 CLTM 63 GSNS 00 VATT 70 Notes The data sheet may differ dependen...

Page 25: ...SERVICE MANUAL CONTROL BUTTONS 1 CONTROL BUTTONS Fig Fig 5 Front panel 23 Fig 6 Rear panel ...

Page 26: ...1 When in operation please point your remote control directly to the infrared sensor 2 Do not expose the remote control to impacts water or disassemble it 3 Do not repeatedly press the buttons on the remote control Allow interval of no less than two seconds 24 ...

Page 27: ...ally completes some settings such as settings for color sound systems picture sound modes and volume 2 After completion the screen message ASM is displayed At this time press the AUTO button again and the TV enters the ASM mode It returns to CH No 1 after ASM You may watch the TV program now If with TUNING LOCK ON the screen message ASM will not appear and ASM doesn t begin 2 Channel selection 1 P...

Page 28: ...th the TV among the and modes Menus Many operations get start from menu selection When watching TV programs press the MENU button to display menu Use the VOL VOL buttons repeatedly to highlight one of PICTURE SETUP TUNING TIMER and OPTION menus cyclically Use the CH CH buttons to access a menu hand cursor is displayed before the highlighted item and the characters turn colored COLOR 50 BRIGHTNESS ...

Page 29: ...L VOL buttons The TV searches another lower upper channel To stop search press the MENU button If the selected channel is not the one you want press the VOL VOL buttons again until the desired channel is selected If the TV does not stop searching when finding a channel please use the FINE TUNE function 3 Frequency fine tuning After selecting FINE TUNE in the TUNING menu press and hold down the VOL...

Page 30: ...3 Vertical Out LA78040 N602 Line Drive V404 T401 2INI IC TMPA8801PSBNG N201 Rem ote Sensor HS0038 EEPROM AT24C16 D702 Circui for Buttons On The TV V230 V231 U L H Y Cb Cr I 2 C I 2 C R G B CRT Power Circuit STR G5653 N801 Fig 10 Structure Block Diagram for CN 18EA Chassis SERVICE MANUAL STRUCTURE AND CHASSIS FUNCTION 1 STRUCTURE BLOCK DIAGRAM 28 AV IN I2C 5V 2 5V 1 9V 2 12V 220V 50Hz 17V 120V ...

Page 31: ...S ound Trap V204 V207 Bridge Rectifier VD801 VD804 C803 C806 Filter L803 C807 11 v 9V 2 5V 2 12V 17V 5V 1 1 20V 33V 27V 195V IF Pre amplifier V101 2 in 1 IC N201 NICA M NN01 NN02 Regulator V883 VD887 C874 Regulator N802 C878 Regulator N121 R128 C125 C126 U101 Tuner HV FV SV Horizontal Output V432 FBT T402 Vertical Output N601 5V 2 5V 2 Diagram for CN 18EA Supply V oltage System LED RMT Circuit N70...

Page 32: ...ower amplifying TDA9808T combined with MSP3410G into NICAM IGR demodulator Thick film IC STR G5653 for power circuit adjustment and control The following features are available in the chassis Color systems PAL NTSC SECAM Sound systems D K B G I M 236 programs preset Multilingual on screen display I2 C bus control NICAM IGR AV stereo Selectable picture sound modes Intelligent lock Message board Tel...

Page 33: ...TMPA8801CSCNG CPCNG CMCNG TMPA8801PSCNG PAN NTSC SECAM 64K 48K 32K SDIP64 TMPA8807CSBNG CPBNG CMBNG TMPA8807PSBNG PAN NTSC SECAM 64K 48K 32K Yes SDIP64 TMPA8808CSBNG CPBNG CMBNG TMPA8807PSBNG NTSC 64K 48K 32K Yes SDIP64 TMPA8809CSBNG CPBNG CMBNG TMPA8807PSBNG PAN NTSC 64K 48K 32K Yes SDIP64 TMPA8813CSNG CPNG CMNG TMPA8813PSNG PAN NTSC 64K 48K 32K SDIP64 TMPA8821CSNG CPNG CMNG TMPA8821PSNG PAN NTSC...

Page 34: ...IP package The MCU contains 8 bit CPU ROM RAM I O ports timer counters A D converters an on screen display controller remote control interfaces IIC bus interfaces and the Closed Fig 12 Caption decoder The TV signal processor contains PIF SIF Video multi standard chroma Sync RGB processors MROM TMPA8801 8807CMBNG ROM 32k TMPA8801 8807CPBNG ROM 48k TMPA8801 8807CRBNG ROM 56k TMPA8801 8807CSBNG ROM 6...

Page 35: ...gative demodulation PIF Multi frequency SIF demodulator without external Tank coil Video Integrated chroma traps Black stretch Y gamma Chroma Integrated chroma BPFs PAL NTSC SECAM demodulation CCD Decoder Digital data slicer for NTSC OSD Clock generation for OSD display Font ROM characters 384 characters Characters display 32 columns 12 lines Composition 16 18 dots Size of character 3 line by line...

Page 36: ...SERVICE MANUAL 3 Block Diagram for TMPA8801 Fig 13 34 ...

Page 37: ...SERVICE MANUAL 4 Block Diagram for TMPA8807 Fig 14 35 ...

Page 38: ... from FBP for OSD 11 VD S to M Vertical timing pulse from sync Separator for OSD 12 CLK M to S 8 MHz clock 13 AVDD M to S Reference voltage for C Video interface 14 ADC S to M A D converter monitoring RF AGC R Y and B Y Functions of SP from MCU are controllable through the IIC bus of the internal connections 5 2 Power Supply TMPA8801 8807 has some power supplys and GND pins Power supplies related ...

Page 39: ... Function 1 P61 LED1 ADC 8 bit KWU5 AIN5 LED1 I O input input output Key on wake up input A D converter analog input High current sink open drain output 2 P60 ADC 8 bit KWU4 AIN4 I O input input Key on wake up input A D converter analog input 3 P53 ADC 8 bit TC1 Int2 KWU0 AIN0 TC1 INT2 I O input input input input Key on wake up input A D converter analog input Timer counter input External interrup...

Page 40: ...5 STOP I O input input External interrupt input STOP mode release signal input 62 P31 Int4 TC3 INT4 TC3 I O input input External interrupt input Timer Counter input 63 P30 Int3 RXIN INT3 RXIN I O input input External interrupt input Remote control signal Preprocessor input 64 P63 LED2 LED2 I O output High current sink open drain output Signal Processor Block Table 9 Pin No Pin Name Function 11 TV ...

Page 41: ...s clipped about 3 3 V by regulator circuit Supply TV DVCC voltage from HVCC 17 voltage via 27Ω TV IN V1 in For TMPA8801 Input terminal for Video signal Input level 1 Vp p 26 fsc out For TMPA8807 Output terminal for fsc wave signal Output level 0 55Vp p typ 27 ABCL Input terminal for ABL ACL control AU out For TMPA8801 Output terminal for Audio signal 28 Ew out For TMPA8807 Output terminal for East...

Page 42: ...minal for RF AGC control level 44 YC VCC 5 V VCC terminal for Y C circuit Supply 5 V 45 Monitor out Output terminal for CVBS or Y signal selected by BUS video SW 46 Black Det Terminal to be connected with Black Det filter for black stretch 47 APC Fil Chrome PLL filter Terminal to be connected with APC filter for Chroma demodulation This terminal voltage controls frequency of VCXO 48 IKin Input ter...

Page 43: ...SERVICE MANUAL 7 Microcontrollers Descriptions MROM version TMPA8801 8807CMBNG CPBNG CRBNG CSBNG Fig 15 41 ...

Page 44: ...TDA8943SF comes in a 9 lead single in line SIL medium power package The TDA8943SF is printed circuit board PCB compatible with all other types in the TDA894x family One PCB footprint accommodates both the mono and the stereo products 2 Features Few external components Fixed gain Standby and mute mode No on off switching plops Low standby current High supply voltage ripple rejection Outputs short c...

Page 45: ...ve loudspeaker terminal VCC 2 supply voltage OUT 3 positive loudspeaker terminal IN 4 positive input IN 5 negative input SVR 6 half supply voltage decoupling ripple rejection MODE 7 mode selection input standby mute operating GND 8 ground n c 9 not connected TDA8943SF Mono Bridge Tied Load BTL audio amplifier Max output power 6W 43 ...

Page 46: ...A8944J comes in a 17 pin DIL bent SIL DBS power package The TDA8944J is printed circuit board PCB compatible with all other types in the TDA894x family One PCB footprint accommodates both the mono and the stereo products 2 Features Few external components Fixed gain Standby and mute mode No on off switching plops Low standby current High supply voltage ripple rejection Outputs short circuit protec...

Page 47: ...l Pin Description OUT1 1 negative loudspeaker terminal 1 GND1 2 ground channel 1 VCC1 3 supply voltage channel 1 OUT1 4 positive loudspeaker terminal 1 n c 5 not connected IN1 6 positive input 1 n c 7 not connected IN1 8 negative input 1 IN2 9 negative input 2 MODE 10 mode selection input standby mute operating continued 45 ...

Page 48: ...ipple rejection IN2 12 positive input 2 n c 13 not connected OUT2 14 negative loudspeaker terminal 2 GND2 15 ground channel 2 VCC2 16 supply voltage channel 2 OUT2 17 positive loudspeaker terminal 2 TDA8944J Stereo power amplifier Max output power 2 7W 46 ...

Page 49: ...0 has supply voltage of 24V and output current of 1 8AP P while LA78041 has supply voltage of 30V and output current of 2 2AP P LA78040 LA78041 Vertical Deflection Output Circuit 1 Features Low power dissipation due to built in pump up circuit Vertical output circuit Thermal protection circuit built in Excellent crossover characteristics DC coupling possible Fig 20 2 Block Diagram Package Type TO ...

Page 50: ...lated standards VIF Automatic Gain Control AGC detector for gain control operating as peak sync detector Tuner AGC with adjustable TakeOver Point TOP Automatic Frequency Control AFC detector without extra reference circuit AC coupled limiter amplifier for sound intercarrier signal Alignment free FM PLL demodulator with high linearity Sound IF SIF input for single reference Quasi Split Sound QSS mo...

Page 51: ...SERVICE MANUAL 3 Block Diagram Fig 22 Block Diagram 49 ...

Page 52: ...rnatively MICRONAS Noise Reduction MNR is performed alignment free Other processed standards are the Japanese FM FM multiplex standard EIA J and the FM Stereo Radio standard Current ICs have to perform adjustment procedures in order to achieve good stereo separation for BTSC and EIA J The MSP34X0G has optimum stereo performance without any adjustments All MSP34X0G versions are pin and software dow...

Page 53: ...d Extended Temperature Devices Available 8 lead PDIP 8 lead JEDEC SOIC 8 lead MAP and 8 lead TSSOP Package 2 wire Serial EEPROM AT24C01A 1K 128 x 8 AT24C02 2K 256 x 8 AT24C04 4K 512 x 8 AT24C08 8K 1024 x 8 AT24C16 6K 2048 x 8 2 Description The AT24C01A 02 04 08 16 provides 1024 2048 4096 8192 16384 bits of serial electrically erasable and programmable read only memory EEPROM organized as 128 256 5...

Page 54: ...mber of other open drain or open collector devices DEVICE PAGE ADDRESSES A2 A1 A0 The A2 A1 and A0 pins are device address inputs that are hard wired for the AT24C01A and the AT24C02 As many as eight 1K 2K devices may be addressed on a single bus system device addressing is discussed in detail under the Device Addressing section The AT24C04 uses the A2 and A1 inputs for hard wire addressing and a ...

Page 55: ...ed with 16 pages of 8 bytes each the 1K requires a 7 bit data word address for random word addressing AT24C02 2K SERIAL EEPROM Internally organized with 32 pages of 8 bytes each the 2K requires an 8 bit data word address for random word addressing AT24C04 4K SERIAL EEPROM Internally organized with 32 pages of 16 bytes each the 4K requires a 9 bit data word address for random word addressing AT24C0...

Page 56: ... on Chip technology with the same operation principle as STR G5600 Pin configuration function and threshold of STR G8600 are compatible with those of STR G5600 2 Block Diagram Fig 27 3 Function of Terminal Table 14 Function of Terminal 54 Terminal No Symbols Description Functions 1 D Drain Terminal MOS FET drain 2 S Source Terminal MOS FET source 3 GND Ground Terminal Ground 4 VIN Power supply Ter...

Page 57: ... 31 8 Supply voltage 5 3 5 3 25 Table 15 Functions and Service Data of MSP3410G Pins Digital Multimeter Pin No Function Description Reference Voltage V Positive Resistance 20KΩ Negative Resistance 20KΩ 1 TP NC 0 16 7 3 5 3 2 AVD GL OUT NC 2 52 6 8 5 51 3 D CTR I O 1 NC 0 01 7 3 5 57 4 D CTR I O 0 NC 0 01 7 2 5 58 5 ADR SEL 4 79 0 7 4 54 6 STANDBYQ 4 79 0 7 4 54 7 I2C CL 3 56 7 4 44 8 I2C DA 3 9 7 ...

Page 58: ...2 OUT L NC 3 82 7 1 5 91 29 CREF 1 0 01 0 001 0 00 30 SC1 OVT R 3 82 7 1 5 91 31 SC1 OUT L 3 82 7 1 5 92 32 SAPL A 7 19 7 1 6 04 33 AHVSUP 8 1 3 4 59 34 CAPL M 7 2 7 1 6 04 35 AHVSS 7 2 7 1 0 00 36 ABNDC 0 01 0 001 6 02 37 SC3 ZN L NC 3 74 7 1 6 1 38 SC3 IN R NC 3 77 7 1 6 1 39 SC2 IN L NC 3 77 7 1 6 1 40 SC2 IN R NC 3 77 7 1 6 1 41 SC1 IN L 3 77 7 1 6 1 42 SC1 IN R 3 77 7 1 6 1 43 VREFTOP 2 6 1 6...

Page 59: ...7 5 85 4 PLL APC filter 2 53 7 9 6 3 5 Audio AGC filter 3 29 7 8 6 17 6 Audio output NTSC 4 5MHz 2 34 7 2 5 86 7 Filter 1 79 7 9 6 29 8 1 2VCC comparison voltage bias 0 9 Video output 2 18 7 6 6 09 10 Second SIF signal output 2 03 7 7 6 17 11 Second SIF signal input 2 81 5 2 4 99 12 RFAGC output 0 04 6 1 13 AGC signal output 3 05 7 9 6 2 14 External connection for VCO oscillating LC network 2 76 7...

Page 60: ...24 62 KΩ Pin No 25 26 27 28 29 30 Resistance 0 56 KΩ 24 70 KΩ 16 65 KΩ 22 04 KΩ 0 3 KΩ 3 27 KΩ Pin No 31 32 33 34 35 36 Resistance 3 29 KΩ 24 27 KΩ 2000 KΩ 362 3 KΩ 2000 KΩ 0 Pin No 37 38 39 40 41 42 Resistance 20 1 KΩ 2000 KΩ 2000 KΩ 0 2000 KΩ 2000 KΩ Pin No 43 44 45 46 47 48 Resistance 13 6 KΩ 0 5 KΩ 3 6 KΩ 223 3 KΩ 2000 KΩ 0 Pin No 49 50 51 52 53 54 Resistance 0 5 KΩ 1217 KΩ 1396 KΩ 1352 KΩ 0 0...

Page 61: ...52 53 54 9V 2 5V 2 5V 2 5V GND GND 55 56 57 58 59 60 5V 0V 5V 5V 5V 4 9V 61 62 63 64 4 1V 5V 5V 0V Table 19 Functions and Service Data of LA78040 78041 Pins GDM8145 Multimeter Ground Resistance KΩ Pin No Function Description Voltage of Pin V Measure with red probe while grounding black probe Measure with black probe while grounding red probe 1 Ground 0 0 0 2 Vertical output terminal 9 73 0 58 0 58...

Page 62: ...he one which has the same safety characteristics as specified in the manual Description of the special markings A The components identified by the A marking have special safety related characteristics AE The components identified by the AE marking are listed by EMC and have special safety related characteristics CB The components identified by the CB marking have been evaluated to the CB standard ...

Page 63: ...CIRCUIT DIAGRAM FOR 21E88 ...

Page 64: ...ched nut M5K Notched nut M5K Notched nut M5 Notched nut M5 Washer Washer Wire clip A Wire clip A Wire clip A Wire clip A Not for Seg Hitachi CRT Not for Seg Hitachi CRT Protection film 2124 width 250mm Protection film 2124 width 250mm Only for Seg Hitachi GS CRTs Only for Seg Hitachi GS CRTs AV plate AV plate Distance clip Distance clip Japan Standard Japan Standard Tin solder Tin solder Japan Sta...

Page 65: ...SB06 XS503 XS503 From Wire Connector XS10A of Front Cover Assembly From Wire Connector XS10A of Front Cover Assembly From Wire Connector XS10B of Front Cover Assembly From Wire Connector XS10B of Front Cover Assembly Wired Connector XS161 Wired Connector XS161 Main Board Assembly Main Board Assembly Side AVBoard Assembly Side AVBoard Assembly CRT s Ground Wire CRT s Ground Wire CRT RGB Board Assem...

Page 66: ...PRINTED CIRCUIT BOARD DIAGRAM 1 ...

Page 67: ...PRINTED CIRCUIT BOARD DIAGRAMS 2 ...

Page 68: ...PRINTED CIRCUIT BOARD DIAGRAMS 3 JUC7 820 820 ...

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