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Norcent LT2022 SERIES, Руководство по обслуживанию

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Norcent LT2022 SERIES Скачать руководство пользователя страница 37

NORCENT LT2022 

37 

R299 

61V0603104 

CHIPR 100K OHM+-5% 1/10 

1 

PCS 

R901 

61V1206105 

CHIP 1MOHM 5% 1/4W 

1 

PCS 

R902 

61V1206105 

CHIP 1MOHM 5% 1/4W 

1 

PCS 

R904 

61V1206105 

CHIP 1MOHM 5% 1/4W 

1 

PCS 

R906 

61V1206754 

CHIP 750KOHM 5% 1/4W 

1 

PCS 

R908 

61V1206339 

CHIP 3.3OHM 1/4W 

1 

PCS 

R910 

61V0805000 

CHIP 0OHM 1/10W 

1 

PCS 

R911 

61V0805240 2F 

CHIP 24KOHM 1% 1/8W 

1 

PCS 

R912 

61V0805203 

CHIPR -5% 1/8W 

1 

PCS 

R915 

61V0603472 

CHIP 4.7K OHM 1/16W 

1 

PCS 

R916 

61V0603472 

CHIP 4.7K OHM 1/16W 

1 

PCS 

R917 

61V0603101 

CHIPR 100 OHM+-5% 1/10W 

1 

PCS 

R918 

61V0603472 

CHIP 4.7K OHM 1/16W 

1 

PCS 

R919 

61V1206470 

CHIP 47OHM 5% 1/4W 

1 

PCS 

R920 

61V1206470 

CHIP 47OHM 5% 1/4W 

1 

PCS 

R922 

61V0603102 

CHIPR 1K OHM+-5% 1/10W 

1 

PCS 

R923 

61V0603000 

CHIPR 0OHM +-5% 1/10W 

1 

PCS 

R924 

61V0603102 

CHIPR 1K OHM+-5% 1/10W 

1 

PCS 

R925 

61V0603102 

CHIPR 1K OHM+-5% 1/10W 

1 

PCS 

R926 

61V0603931 1F 

CHIPR 9.-1% 1/10 

1 

PCS 

R927 

61V0603243 1F 

CHIP 2.43K OHM 1/16W 1% 

1 

PCS 

R928 

61V0805104 

CHIPR 100K OHM+-5% 1/8W 

1 

PCS 

R929 

61V1206000 

CHIP 0 OHM 1/8W 

1 

PCS 

R930 

61V1206000 

CHIP 0 OHM 1/8W 

1 

PCS 

ZD901 

93T 39S 12    T 

RLZ20B LLDS 

1 

PCS 

ZD902 

93T 39S 17    T 

RLZ12B LLDS 

1 

PCS 

 

715T1140 1E 

PCB BOARD 

1 

PCS 

C110 

67T 2154713RT 

KY16VB470-M-TP5 8*15MM 

1 

PCS 

C216 

64T701J2240AT 

0.22UF +-5% 63V 

1 

PCS 

C230 

64T701J2240AT 

0.22UF +-5% 63V 

1 

PCS 

C905 

6T  31  4 

1.7MM RIVET 

2 

PCS 

C906 

65T  1K152 1T 

1.5NF/1KV Z5F+-10% 

1 

PCS 

C907 

67T 305220 7T 

22uf 50v 

1 

PCS 

CN901  6V  31500 

EYELET 

2 

PCS 

D221 

93T  64 1152T 

1N4148 

1 

PCS 

D222 

93T  64 1152T 

1N4148 

1 

PCS 

D224 

93T  64 1152T 

1N4148 

1 

PCS 

D225 

93T  64 1152T 

1N4148 

1 

PCS 

D226 

93T  64 1152T 

1N4148 

1 

PCS 

D227 

93T  64 1152T 

1N4148 

1 

PCS 

D901 

93T  6026T52T 

FR107 

1 

PCS 

D902 

93T  6038T52T 

FR103 

1 

PCS 

FB101 

71T  55 29 

BEAD 

1 

PCS 

FB901 

71T  55 29 

BEAD 

1 

PCS 

FB902 

71T  55 29 

BEAD 

1 

PCS 

IC202 

56T 158 10    T 

IC 

1 

PCS 

IC903 

56T 158 10    T 

IC 

1 

PCS 

R215 

61T 17110252T 

1K OHM +-2% 1/4W 

1 

PCS 

R216 

61T 17110252T 

1K OHM +-2% 1/4W 

1 

PCS 

R218 

61T 17110252T 

1K OHM +-2% 1/4W 

1 

PCS 

R220 

61T 60230352T 

30KOHM 5% 1/6W 

1 

PCS 

R222 

61T 60143252T 

4.3K OHM +-2% 1/6W 

1 

PCS 

R223 

61T 60230352T 

30KOHM 5% 1/6W 

1 

PCS 

R227 

61T 60230352T 

30KOHM 5% 1/6W 

1 

PCS 

R242 

61T 17110252T 

1K OHM +-2% 1/4W 

1 

PCS 

R243 

61T 17110252T 

1K OHM +-2% 1/4W 

1 

PCS 

R245 

61T 17110252T 

1K OHM +-2% 1/4W 

1 

PCS 

Содержание LT2022 SERIES

Страница 1: ...SERIES THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER TH...

Страница 2: ...Use of the Menus 6 2 2 1 Front Panel Control Knobs 6 2 2 2 To Use The Menus 6 3 Trouble Shooting Chart 10 4 White Balance Luminance Adjustment 14 5 Software Flow Chart 15 6 BOM 17 7 PCB Layout 39 7 1...

Страница 3: ...ip Yes TV Function Color System NTSC AV1 RCA x 1 Audio L R x 1 RCA x 1 AV2 S Video x 1 Audio L R x 1 Share Video Inputs Component YPbPr x 1 Audio L R x 1 Speaker built in Two 5 watt speakers Headphone...

Страница 4: ...OSD control signal to the Main Board Apply power to the display by turning the power switch to the ON position and allow about ten seconds for panel warm up The Power On indicator lights ORANGE when t...

Страница 5: ...channels which are not erased To view a blocked channel use the digit buttons to access PRE CH Display the previously selected TV channel TV VIDEO Select your input source press repeatedly to select...

Страница 6: ...Use the cursor up down to select a menu item 3 Use the cursor left right to enter a submenu or enable disable the function 4 Press the MENU button to exit the menu MAIN MENU Press the MENU button to e...

Страница 7: ...nversations while the TV program is in progress Captions will appear on the screen only during captioned broadcasts Remark the captions do not always use correct spelling and grammar Not all TV progra...

Страница 8: ...by the broadcaster The default setting is to allow all programs to be viewed Viewing can be blocked by the type of program and by the categories chosen be blocked It is also possible to block all pro...

Страница 9: ...press the SLEEP button once To cancel the sleep time repeatedly press the SLEEP button until appears If you turn the TV off after setting the sleep time the setting will be erased Set it again SETUP...

Страница 10: ...ge Sticking Dot Defect Brightness Spot Dot Defect Particle Check Panel Panel Change No display Check Power Board Check Main board Check Panel Change Panel Change Main board Change Power Board Check Ke...

Страница 11: ...Panel Check LVD Cable Change LVDS Cable R G B Display Abnormal Check Single Cable Change Single Cable Check Main board Change Main board Check Panel Change Panel Monitor Shut Down Check Power board Ch...

Страница 12: ...hange Main board Change LVDS Wire LED Off Change Keyboard or Main board or wire Change Keyboard or Main board or wire A Change Wires LED Abnormal LED Dark LED Display Abnormal LED Flicker Abnormal Key...

Страница 13: ...Board OSD is unstable or not working Is Key Pad Board connecting normally Connect Key Pad Board Is Button Switch normally Replace Button Switch Y N N Is Key Pad Board Normally Replace Key Pad Board Y...

Страница 14: ...Set Wireless Headphone ON OFF PP Set PIP ON OFF BI Setup Burn in mode ON OFF ISP Set ISP ON OFF SR PP Set SRS ON OFF EX Exit MORE function to factory mode menu Before Adjustment 1 Press Number key 10...

Страница 15: ...NORCENT LT2022 15 5 Software Flow Chart 1 2 N Y 5 Y N 10 Y N 12 Y N 7 Y N 6 4 3 8 9 14 11 13 Y N 15 Y N 16 17 19 Y N 18...

Страница 16: ...nd set it to green color Scalar initializes 10 In standby mode 11 Update the lifetime of back light 12 Check the analog port are they re any signals coming 13 Does the scalar send out an interrupt req...

Страница 17: ...OR BASE 1 PCS 44T2004815 2A CARTON 1 PCS 44T3231 15 EVA WASHER 1 PCS 44T3231 15528 EVA WASHER 1 PCS 44T3231 15548 EVA WASHER 1 PCS 44TZ001200 4 PIZZA BOX 1 PCS 45T 76 28 RN PE BAG FOR MANUAL 1 PCS 45T...

Страница 18: ...SCREW 10 PCS Q1V 140 20120 SCREW 4 PCS Q1V 330 8120 SCREW 3X8mm 4 PCS Q1V 330 8120 SCREW 3X8mm 2 PCS Q1V 330 8120 SCREW 3X8mm 2 PCS Q1V1030 8128 SCREW 8 PCS Q1V1030 8128 SCREW 2 PCS Q1V1030 12128 SCRE...

Страница 19: ...D 600 OHM 1 PCS FB5 71T 56U601 BEAD 600 OHM 1 PCS Q2 57T 417 6 PMBS3906 PHILIPS SMT 1 PCS R2 61V0603100 1F CHIP 1KOHM 1 10W 1 1 PCS R20 61V0603301 CHIP 300 OHM 1 16W 1 PCS R3 61V0603150 1F CHIP 1 5OHM...

Страница 20: ...NXS12 000AC30F BT 2 1 PCS X301 93T 22 61 J CRYSTAL 32 768 KHZ 3 9 1 PCS X600 93T 2268B J 18 432MHZ 1 PCS 40T 457624 1B CPU LABEL 1 PCS 715V1229 1 2 LCD TV M B 1 PCS C100 65T0603104 12 CHIP 0 1UF 50V...

Страница 21: ...65T0603339 31 CHIP 3 3PF 50V NPO 1 PCS C202 65T0603339 31 CHIP 3 3PF 50V NPO 1 PCS C203 65T0603102 32 CHIP 1000PF 50V X7R 1 PCS C204 67T 312479 6 SMD 85 4 7UF 20 1 PCS C205 65T0805684 17 CHIP 0 68UF...

Страница 22: ...65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C316 65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C317 65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C318 65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C319 65T0603104 12 CHIP 0 1U...

Страница 23: ...65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C376 65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C377 65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C378 65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C380 65T0603104 12 CHIP 0 1U...

Страница 24: ...CS C526 65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C527 65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C528 65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C529 65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C530 65T0603104 12 CH...

Страница 25: ...3 SMD EC 100UF 16V 85C D 1 PCS C653 67T 312100 3 SMD EC 10UF 16V 85C B 1 PCS C654 65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C655 65T0603104 12 CHIP 0 1UF 50V X7R 1 PCS C656 65T0603102 32 CHIP 1000PF 50V...

Страница 26: ...56U601 BEAD 600 OHM 1 PCS L110 71T 56U601 BEAD 600 OHM 1 PCS L112 71T 56U601 BEAD 600 OHM 1 PCS L113 71T 56G301 EA CHIP BEAD 300 OHM 0805 1 PCS L114 71T 56G301 EA CHIP BEAD 300 OHM 0805 1 PCS L116 71T...

Страница 27: ...0805 1 PCS L613 71T 56G301 EA CHIP BEAD 300 OHM 0805 1 PCS L614 71T 56G301 EA CHIP BEAD 300 OHM 0805 1 PCS L615 71T 56U601 BEAD 600 OHM 1 PCS L700 71T 56U601 BEAD 600 OHM 1 PCS L702 71T 57G601 BEAD 12...

Страница 28: ...R136 61V0603000 CHIPR 0OHM 5 1 10W 1 PCS R2 61V0805000 CHIP 0OHM 1 10W 1 PCS R200 61V0603000 CHIPR 0OHM 5 1 10W 1 PCS R201 61V0603000 CHIPR 0OHM 5 1 10W 1 PCS R202 61V0603000 CHIPR 0OHM 5 1 10W 1 PCS...

Страница 29: ...61V0603000 CHIPR 0OHM 5 1 10W 1 PCS R327 61V0603101 CHIPR 100 OHM 5 1 10W 1 PCS R328 61V0603101 CHIPR 100 OHM 5 1 10W 1 PCS R329 61V0603101 CHIPR 100 OHM 5 1 10W 1 PCS R330 61V0603101 CHIPR 100 OHM 5...

Страница 30: ...S R504 61V0603220 CHIPR 22 OHM 5 1 10W 1 PCS R505 61V0603102 CHIPR 1K OHM 5 1 10W 1 PCS R506 61V0603750 9F 75 OHM 1 1 10W 1 PCS R507 61V0603750 9F 75 OHM 1 1 10W 1 PCS R508 61V0603472 CHIP 4 7K OHM 1...

Страница 31: ...3473 CHIP 47K OHM 1 16W 1 PCS R702 61V0603223 CHIP 22KOHM 1 16W 1 PCS R703 61V0603302 CHIP 3KOHM 1 16W 1 PCS R704 61V0603473 CHIP 47K OHM 1 16W 1 PCS R705 61V0603223 CHIP 22KOHM 1 16W 1 PCS R706 61V12...

Страница 32: ...TP 1 PCS U310 56T1133 52TCO A29L040L 70 1 PCS U500 56T1133 34 M24C02 WMN6TP 1 PCS U501 56T 567 7 MST9883C 140 LQFP 80 BY 1 PCS U600 56V 593 6 M62438FP SOP 10 1 PCS U601 56T 593 4 MSP3425G QI B8 V3PMQF...

Страница 33: ...4 73T 253138 Y CHOKE BY 1 PCS L205 73G 174 35 YS FILTER 1 PCS L206 73G 174 35 YS FILTER 1 PCS L901 73L 174 31LSG CHOKE COIL 1 PCS L902 73L 174 29LSH LINE FILTER 1 PCS L903 73T 253 91 LS CHOKE BY LI SH...

Страница 34: ...41 65T0805225 27 2 2UF 1 PCS C242 65T0805104 22 0 1UF 10 25V X7R 080 1 PCS C243 65T0805105 22 CHIP 1UF 25V X7R 0805 1 PCS C245 65T0805104 22 0 1UF 10 25V X7R 080 1 PCS C246 65T0805104 22 0 1UF 10 25V...

Страница 35: ...4 CHIP PMBS3904 BY PHILIP 1 PCS Q220 57T 760 5 DTC144WKA BY FOHM SMT 1 PCS Q221 57T 760 5 DTC144WKA BY FOHM SMT 1 PCS Q222 57T 417 4 CHIP PMBS3904 BY PHILIP 1 PCS Q223 57T 760 5 DTC144WKA BY FOHM SMT...

Страница 36: ...R259 61V0603120 2F CHIP 12K OHM 1 10W 1 1 PCS R260 61V0603100 4F CHIP 1M OHM 1 10W 1 1 PCS R261 61V0603100 4F CHIP 1M OHM 1 10W 1 1 PCS R262 61V0603100 4F CHIP 1M OHM 1 10W 1 1 PCS R263 61V0603100 4F...

Страница 37: ...1 PCS R930 61V1206000 CHIP 0 OHM 1 8W 1 PCS ZD901 93T 39S 12 T RLZ20B LLDS 1 PCS ZD902 93T 39S 17 T RLZ12B LLDS 1 PCS 715T1140 1E PCB BOARD 1 PCS C110 67T 2154713RT KY16VB470 M TP5 8 15MM 1 PCS C216 6...

Страница 38: ...61T 17210552T 1MEGOHM 5 1 4W 1 PCS R907 61T 17275452T 750KOHM 5 1 4W 1 PCS R909 61T 17210052T 100HM 5 1 4W 1 PCS R913 61T 17220352T 20KOHM 5 1 4W 1 PCS R921 61T 17224152T 240 OHM 5 1 4W 1 PCS ZD101 9...

Страница 39: ...NORCENT LT2022 39 7 PCB Layout 7 1 Main Board PCB Layout...

Страница 40: ...NORCENT LT2022 40...

Страница 41: ...NORCENT LT2022 41 7 2 Power Board PCB Layout...

Страница 42: ...NORCENT LT2022 42...

Страница 43: ...DIO Decoder HCT 4052 Selector SPV301A Scaler OSD MCU 20 inch Panel Inverter GTL5640L16 SDRAM 24LC16 EEPROM AT29LV040A Flash ROM IR Key PAD Y Pb Pr S VIDEO VPC 3230 Decoder PHILIPS FQ1236 F H3 Tuner NJ...

Страница 44: ...rt Circuit R906 R907 PWM Control IC Transformer Over Voltage Protect MOSFET Q901 Rectifier CMOS Voltage Feedback Circuit AC input 5V 12V ON OFF Control PWM Control IC LM339M Feedback Circuit ROYER Cir...

Страница 45: ...11 15 4 1 6 8 7 DD S2D S1A IN S1B S2A S2B S1C S2C DC S1D EN DA V C C G N D DB L P 1 0 4 1 2 0 O H M 8 P 4 R 1 2 3 4 5 6 7 8 DVD_AL 2 L117 300 OHM L113 300 OHM CN105 CONN 1 2 3 3230_PB O_PRO_PR AGND L1...

Страница 46: ...5 1 1 6 W Ro AV1_L 1 U102 NJM2244 1 3 5 6 7 8 2 4 VIN1 VIN2 VIN3 V VOUT G N D SW1 SW2 Ro Go C 1 4 6 4 7 0 p F C114 0 22uF VIDEO_SEL 6 AV1_R_1 C163 10uF 16V DVD_AL 1 AV1_R_1 Go VSEL_HS 9 R126 NC 0 1 10...

Страница 47: ...100 1 16W R7 0 1 10W TUNER_SIF 11 AGND C101 47pF 12V_T R107 220 1 16W L104 NC 5V_A C181 100pF L107 600 OHM R10 0 1 10W AGND R102 8 2 3W AGND R103 8 2 3W AGND TU100 TUNER 1 2 3 1 1 1 2 1 3 1 4 1 8 1 5...

Страница 48: ...V S M S Y H S F S Y H C H S Y A A V O X T A L 1 N C C L K 5 V S T B Y I2CSEL VRT GNDF A S G F ISGND VIN1 CIN VOUT VSUPF VIN2 VIN3 VIN4 VSUPAI GNDAI FB1IN VREF AISGND C237 0 1uF AGND Y4 C3 VIN2 C221 0...

Страница 49: ...MDR16 C371 1uF 50V BL_ADJ 1 MDR8 MDR9 MDR16 MAR11 MDR26 C384 0 1uF MDR4 MDR9 C P U P 0 6 DQML0 R353 75 1 16W MRASNN MA1 C377 0 1uF CPUP07 DQMH1 CPUP01 MD23 MD24 MD3 MDR23 R349 4 7K 1 16W C367 15pF CPU...

Страница 50: ...M1 Y1 C398 100uF 16V ROUT 0 7 9 1 G3 FM17 FM11 L312 600 OHM SVIDEO FM23 FM5 C0 RN306 22 1 16W 1 2 3 4 8 7 6 5 L310 600 OHM TP311 TP 5V 3 3VM FM31 TP307 TP RN324 22 1 16W 1 2 3 4 8 7 6 5 PVSOUT TP306 T...

Страница 51: ...d U300F SPV301A M12 M13 M14 M15 N12 N13 N14 N15 P12 P13 P14 P15 D15 L12 L13 L14 L15 L16 M11 M16 N11 N16 P11 P16 R11 R16 T11 T12 T13 T14 T15 R12 T16 A1 A2 B1 B2 C1 C3 D4 AC8 AC11 AC15 AC16 AC17 D9 D10...

Страница 52: ...1 16W 3 3V_AP RX L506 50 OHM RX VGA_HS 2 C505 0 47uF 50V C512 100pF Near IC 5VP C513 100uF 16V C507 0 001uF C520 0 1uF R500 NC 1K 1 16W AD_Clamp 6 RED C509 0 1uF C517 0 1uF C531 0 1uF GOUT1 AGND R511...

Страница 53: ...16V R618 47K 1 16W R654 4 7K 1 16W Audio_R 1 C635 560pF C644 220uF 16V C653 10uF 16V L612 300 OHM R624 100 1 16W R 6 3 6 1 K 1 1 6 W R645 0 1 10W C638 22uF 16V R634 1K 1 16W C650 0 22uF SRS_CTL 6 C65...

Страница 54: ...6 3 6 4 SCL SDA I2S_CL I2S_WS I2S_DA_OUT I2S_DA_IN1 ADR_DA ADR_WS ADR_CL DVSUP DVSS I2S_DA_IN2 NC NC NC RESETQ N C N C V R E F 2 D A C M _ R D A C M _ L N C N C N C N C N C V R E F 1 S C 1 _ O U T _ R...

Страница 55: ...4 5 L701 L 12VP From Power Supply12V C710 100uF 16V C716 0 1uF C713 47uF 16V 12V AGND R714 0 1 10W U700 3 2 1 VI VO G N D AGND AGND AGND L708 600 OHM R702 22K 1 16W C719 10uF 16V C712 0 1uF Q700 AO340...

Страница 56: ...3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 U802 LM3940S 3 3 1 3 2 IN OUT G N D G6 B1 B7 P_CLK 1 6 U800 NC 51 52 54 55 56 2 3 4 6 7 8 10 11 12 14 15 16 18 19 20 22 23 24 25 27 28 30 50 47 45 41 37...

Страница 57: ...560pF C405 0 1uF SCL 3 4 5 6 9 11 15 R405 22K 1 16W C402 0 1uF C415 10uF 16V SDA 3 4 5 6 9 11 15 C414 47PF C411 47uF 16V Q400 NC NC L403 82uH R414 100 1 16W C410 NC 220pF VD_VOUT R412 10K 1 16W C401 1...

Страница 58: ...D Y C O 1 D Y C O 2 D Y C O 3 D Y C O 4 D Y C O 5 D Y C O 6 D Y C O 7 D Y C O 8 D Y C O 9 A L T F C S I R P L L L I N E K I L D G N D AVDD CBPC ACO AYO CBPY AGND AGND AYI VCL VRBY VRTY AVDD AVDD VRTC...

Страница 59: ...80LL17T 5 5Vout R915 4 7K R908 3R3 1206 L903 73L 253 91L 1 2 C920 1000UF 16V C901 1000PF 250V 12Vout C911 0 1uF 50V ZD902 RLZ12B C906 152P 1KV R901 1M 1206 R926 9 31KF 5V SG6841 IC901 SG6841 1 3 4 7 2...

Страница 60: ...1 SR24 R101 39K C107 0 1UF Q101 SI4431DY T1 4 8 5 6 7 3 2 1 R103 20KF C106 1000uF 16V C104 NC C105 100PF NPO LM3485 IC102 1 6 7 5 2 8 3 4 Isense PWR GND PGATE ADJ GND VIN N C FB D102 SR24 C103 10NF 12...

Страница 61: ...5V Q206 SST3904 L203 73L174 35 LS 1 3 2 4 D214 1N4148 R245 1K 1206 D201 RLZ8 2B C207 0 1UF L201 150UH 60 52 CN205 S M 0 2 B B H S S 1 T B 1 2 R 2 0 2 1 K M O F D I P 1 W Q207 RK7002 1 3 2 R239 0 C225...

Страница 62: ...T _ 3 V_SENSOR_1 C240 0 1UF R270 100 1206 Q222 SST3904 C232 0 1UF R2100 300K D227 1N4148 R268 51K R284 27K R294 300K BU_L Q219 SST3904 R274 18K R289 100K R277 0 R258 1M C242 0 1UF C237 0 1UF D221 1N4...

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