NAD L55 Service Manual Download Page 10

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2-1

SECTION 2

ELECTRICAL

CONTENTS

ELECTRICAL TROUBLESHOOTING GUIDE

......................................................................2-2

1. Power (SMPS) Circuit ..............................................................................................................2-2

............................................................................................................................2-3

3. MPEG Circuit............................................................................................................................2-6

4. Front Circuit (Digitron & Key) ...............................................................................................2-7

5. RF/Servo Circuit ......................................................................................................................2-8

BLOCK DIAGRAMS

..................................................................................................................2-12

1. Overall Block Diagram ..........................................................................................................2-12

2. Power (SMPS) Block Diagram..............................................................................................2-13

3. RF/CD DSP/DVD DSP/DVD servo Block Diagram ..............................................................2-14

4. Audio Block Diagram ............................................................................................................2-15

5. MPEG Block Diagram...........................................................................................................2-16

...........................................................................................................2-17

CIRCUIT DIAGRAMS

................................................................................................................2-18

1. Power (SMPS) Circuit Diagram ............................................................................................2-18

2. DVD DSP Circuit Diagram .....................................................................................................2-20

3. Drive & RF Circuit Diagram ..................................................................................................2-22

4. MPEG Circuit Diagram ..........................................................................................................2-24

4-1. WAVEFORMS ...................................................................................................................2-26

5. Audio DM & 5.1CH Circuit Diagram .....................................................................................2-28

....................................................................................................................2-30

7. DIGITRON & Key Circuit Diagram ........................................................................................2-32

8. Jack Circuit Diagram .............................................................................................................2-34

PRINTED CIRCUIT DIAGRAMS

............................................................................................2-36

1. MAIN P.C.BOARD ...................................................................................................................2-36

2. POWER P.C.BOARD ..............................................................................................................2-38

3. AV P.C.BOARD .......................................................................................................................2-40

4. FRONT P.C.BOARD ...............................................................................................................2-42

Summary of Contents for L55

Page 1: ...SERVICE MANUAL L55 DVD VIDEO CD CD PLAYER DVD VIDEO CD CD PLAYER L55 ...

Page 2: ...1 2 ...

Page 3: ...CONDUIT ETC AND THE EXPOSED METALLIC PARTS ONE AT A TIME MEASURE THE A C VOLTAGE ACROSS THE COMBINATION OF 1500 OHM RESISTOR AND 15 MFD CAPACITOR REVERSE THE A C PLUG AND REPEAT A C VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC PART VOLTAGE MEASURE MUST NOT EXCEED 75 VOLTS R M S THIS CORRESPONDS TO 0 5 MILLIAMP A C ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE CO...

Page 4: ...ncluding Metal panels Input terminals Earphone jacks etc Electrostatically Sensitive ES Devices Some semiconductor solid state devices can be damaged easily by static electricity Such components commonly are called Electrostatically Sensitive ES Devices Examples of typical Es devices are integrated circuits and some field effect transistors and semiconductor chip components The following technique...

Page 5: ...ic distortion audio 0 008 Wow and flutter Below measurable level less than 0 001 W PEAK EIAJ Operating conditions Temperature 41 F to 95 F Operation status Horizontal Video output 1 0 V p p 75 negative sync RCA jack x 1 S video output Y 1 0 V p p 75 negative sync Mini DIN 4 pin x 1 C 0 286 V p p 75 SCART video output CVBS 1 0 V p p 75 negative sync RCA jack x 1 RGB 0 63 V p p 75 Audio output digit...

Page 6: ...n OPERATING STATUS indicator CD indicator VCD indicator DVD indicator PROGRAM indicator Repeat playback mode indicators CHP TRK NUMBER indicator TOTAL PLAYING TIME ELAPSED TIME indicator TITLE NUMBER indicator ANGLE ICON indicator REMOTE CONTROL SUB WOOFER CENTER VIDEO OUT REAR OPTICAL COAXIAL FRONT 5 1 CH OUTPUT DIGITAL OUT S VIDEO OUT EURO AV TV VCR AUDIO OUT SYSTEM SINGLE REMOTE CONTROL SELECTO...

Page 7: ... OUT jacks EURO AV TV VCR OUT jack OPTICAL DIGITAL AUDIO OUT jack DIGITAL AUDIO OUT jacks COAXIAL DIGITAL AUDIO OUT jacks COAXIAL POWER CORD Connect to an AC 230V 50Hz outlet only POWER CORD Connect to an AC 110V 60Hz outlet only S VIDEO OUT jack S VIDEO OUT jack EUR VERSION USA CANADA VERSION OPTICAL DIGITAL AUDIO OUT jack ...

Page 8: ...REMOTE CONTROL REMOTE SELECT 1 8 ...

Page 9: ...9 KTB3 6JFZ S10 SCREW KHE170 PCB HOLDER 2 DISPLAY KNOB 1 POWER KNOB 1 SENSOR WINDOW 1 QT Y 1 2 1 0 17 KKM1A106ZC26 KGR1A214M7ZK102 PARTS NO SIDE BAR NO 1 4 3 x2 6 5 S6 2 8 7 11 10 9 13 12 14 15 DESCRIPTION FRONT PANEL DOOR ORNAMENT FIP WINDOW LED INDICATOR 4 4 1 1 2 1 1 1 1 KUA1A189 BJDTVM502 1 KGW1A298 KKC3B076S33 KHG1A104 KMD1A413 1 FRONT PCB ASS Y 18 17 19 20 22 25 24 23 21 27 26 29 28 QT Y 4 4...

Page 10: ...DVD servo Block Diagram 2 14 4 Audio Block Diagram 2 15 5 MPEG Block Diagram 2 16 2 17 CIRCUIT DIAGRAMS 2 18 1 Power SMPS Circuit Diagram 2 18 2 DVD DSP Circuit Diagram 2 20 3 Drive RF Circuit Diagram 2 22 4 MPEG Circuit Diagram 2 24 4 1 WAVEFORMS 2 26 5 Audio DM 5 1CH Circuit Diagram 2 28 2 30 7 DIGITRON Key Circuit Diagram 2 32 8 Jack Circuit Diagram 2 34 PRINTED CIRCUIT DIAGRAMS 2 36 1 MAIN P C...

Page 11: ...626 D609 Check IC64 D628 D621 Check Q622 Q623 R632 Check Q620 Q625 R625 No 8V No 3 3V Check D625 IC62 Check IC67 R609 NO FLD 1 POWER SMPS Circuit ELECTRICAL TROUBLESHOOTING GUIDE END No 5V_D 5V_A NO NO NO NO YES YES YES YES Is High State applied to CN63 Pin 2 Is 5 2V applied to PT61 Pin 1 Is 24V applied to CN62 Pin 3 ...

Page 12: ...eplace Main B D 2 u COM Circuit A NO Power NO Check FRONT Circuit NO YES YES YES YES YES YES YES YES YES YES YES NO NO NO NO NO NO NO Is LED Off Does bar appear on FLD Is oscillation of X501 normal Are IC503 Pin 14 28 and 29 normal Are IC506 Pin 7 8 normal The waveform on A 00 21 and D 00 15 of IC501 normal Does logo appear on the screen Is 5 2V applied to CN61 Pin 12 ...

Page 13: ...ES If OK YES If OK Check PLL FC of MPEG part Refer to Audio part Refer to MPEG part Replace B D Check Front Reconnect it Refer to SERVO part Check the connection of MD AUDIO ABNORMAL OPEN CLOSE ABNORMAL C Video abnormal Check Video jack YES If OK YES If OK YES If OK YES If OK Refer to Video part Refer to Encoder part Refer to MPEG part Replace B D VIDEO ABNORMAL ...

Page 14: ...k the disc If OK YES If OK YES If OK Refer to Servo part Check PLL IC of MPEG part Check DSP Check MPEG YES If OK Replace B D PICTURE ABNORMAL F Disc Error Check Disc YES If OK YES If OK Refer to Servo part Replace B D DISC ERROR ...

Page 15: ...moving picture of the video CD play on the screen normally Does the audio sound output normally END Check power clock Check CD DVD DSP output signal Check MPEG Decoder input signal Check CD DVD DSP output signal Check MPEG Decoder input signal Check CD DVD DSP output signal Check MPEG Decoder input signal Check clock signal Check clock signal YES YES YES YES YES YES YES YES YES YES NO NO NO OK OK ...

Page 16: ...igitron Key NO Check Q901 Q904 D902 Check L901 YES YES YES YES YES YES YES YES YES YES YES YES NO NO NO NO NO NO NO NO NO NO NO Is LED Off Does bar appear on FLD Does Main Error appear on FLD Check waveform of IC91 Pin 14 Does all the buttons work normally Does remote control work normally Does waveform of IC92 Pin 1 appear Is IC91 Pin 24 connected to IC92 Pin 1 Is 5V applied to IC92 Pin 3 Is 5 2V...

Page 17: ...s TTL pulse output to IC201 Pins 140 142 Does 33 8688MHz clock input to IC201 Pin 63 Is IC201 Pins 83 84 88 89 voltage about 2 2V Replace IC201 IC206 soldering or IC defect Check power circuit Check 2 µ COM Part Replace X301 or IC304 30MHz clock defect CHECK POINT General 5 RF Servo Circuit A END NO NO NO NO NO YES YES YES YES YES ...

Page 18: ...move up and down Check Focus Driver output IC201 Pin 83 IC2M1 Pins 37 38 Check SLED Driver output IC201 Pin 88 IC2M1 Pins 28 29 IC201 Pin 88 no output IC201 is defective IC2M1 Pin 18 no output IC2M1 is defective IC201 Pin 83 no output IC201 is defective IC2M1 Pins 1 2 no output IC2M1 is defective DECK assembly is defective Slide the pick up to inner track Power on Check loading Part Push Pick up t...

Page 19: ...ppear OPEN CLOSE Replace µ COM or IC201 Replace IC201 Check IC2A1 Pin 11 12 13 14 in DVD Mode Fig 3 FOCUS ERROR waveform IC201 no output Pick up is defective Check IC201 and IC2M1 when PMD03 Pin 6 is abnormal Check IC2M1 Pin 21 PMD03 Pin 6 turn when the IC2M1 Pin 21 is less than 2 2V Check A Video Part is defective Check 5 MPEG Circuit Check 7 OSD Video Circuit Replace µ COM part IC2A1 is defectiv...

Page 20: ...RF 1 5 1 6V IC2A1 Pin 57 Fig 5 RF waveform Check IC2A1 Pins 5 6 7 8 No signal Pick up is defective Replace IC201 Check IC201 Pin84 No signal at IC201 IC201 is defective Check IC201 Pin 162 Check the clock at the IC201 Pins 28 30 Both are normal IC201 is defective Replace IC2A1 CHECK A D END NO NO NO NO YES YES YES YES ...

Page 21: ...2 12 BLOCK DIAGRAM ...

Page 22: ...S Block Diagram RECTIFIER FLD RECTIFIER LINE FILTER SWITCHING TR RECTIFIER 14V LPF REG 8V REG 3 3V REG 3 3V PWR ON OFF F F 24VA 12VA 8V 5 2VA 5V_D 5V_A 3 3V 3 3V_M 2 5V LPF RECTIFIER 9V RECTIFIER 5 2V TRANS LPF FEED B ...

Page 23: ...BADD SENS FOK SLD_FG MSDATO DEFECT DSP_SENSE SQSO SQCK SCOR XLAT S_CLK S_DATA DSP_CS WR RD DO 0 7 AO 0 5 DVD_DATA 0 7 MCK UCOM I F MPEG I F UCOM I F M D DVD CD RF MIRR TZC ICADDR 0 8 ICDATA 00 15 MON MDP FDO TDO FMO Spindle focus tracking loading sled SPINDLE_FG Load open close loading control CD A B C D E F 4 4 5 3 3 3 8 6 8 8 2 4 9 16 3 RF CD DSP DVD DSP DVD SERVO Block Diagram ...

Page 24: ... F DAC_RST S_DATA S_CLK DAC_L0 DA_LRCK DA_BCK DA_XCK DA_DATA0 DAC_RST S_DATA S_CLK DAC_L1 DA_LRCK DA_BCK DA_XCK DA_DATA 1 3 MPEG I F U COM I F MPEG I F IC452 LPF Buffer NJM4580M OP AMP A V JACK I F IC453 LPF Buffer NJM4580M OP AMP IC454 LPF Buffer NJM4580M OP AMP L R L R FL FR FL FR RL RR CENTER WOOFER CENTER WOOFER RL RR ...

Page 25: ... 27MHz X TAL U COM I F DVD_DATA 0 7 DAI_DATA DA_DATA 0 3 DA_BCK DA_XCK DA_LRCK SPDIF AUDIO I F U COM I F SERVO I F DA_XCK MPEG_CLK 8 SDCLK1 ZISENB REQZ1 2 2 A 00 02 D 00 07 MPEG_ERROR MPEG_RST DVD_SD_CS0 DVD_UDQM DVD_MD 0 15 DVD_MA 0 11 DVD_SD_CAS DVD_SD_RAS DVD_SD_CLK DVD_MWE DVD_LDQM DVD_SD_CS1 S_CLK S_DATA DPLL_L MCK 8 4 4 2 12 16 3 ...

Page 26: ...TE DAC_RST Y_SEL MPEG_ERROR DAC_L0 RF_LAT DSP_CS MPEG_CS PP_CS 16 Y_SEL MPEG_RST PWR_CTL SENS LIMIT_SW MIC_ON CLOSE_SW OPEN_SW MPEG_WAIT 16 9 MPEG_RST M_RESET M_RESET RXD0 TXD0 SCK0 F_REQ MODE_SW M_REQ ECHO IIC_CLK IIC_DATA SENS_MCOM MICOM_WAIT IOCS1 WR D 00 04 A 19 21 A 01 19 D 00 15 A 01 09 D 00 15 A 01 21 21 D 00 15 D 00 07 DAC_RST E_DR S_XRST XLAT ACT_MUTE LOAD_OPEN LOAD CLOSE PWR_RST EXP_W2 P...

Page 27: ...2 18 2 19 CIRCUIT DIAGRAM 1 POWER SMPS CIRCUIT DIAGRAM ...

Page 28: ...DE CIRCUITO DE DVD DSP 5 5 6 TRACKING LOOP FOCUS LOOP SLED LOOP SPINDLE LOOP WAVEFORM IC204 is defective Scratched CD Audio abnormal IC203 is defective AD Converter Error No tracking Focus control 2 DVD DSP CIRCUIT DIAGRAM ...

Page 29: ... DIAGRAM 4 1 1 6 2 3 TRACKING LOOP FOCUS LOOP SLED LOOP SPINDLE LOOP WAVEFORM OPEN OPEN Q2M3 is defective Spindle rotates in high speed IC2A2 is defective No fucus tracking control Q2A1 Q2A2 are defective CD DVD LD will not be on ...

Page 30: ...EN DISPLAY NO CD SOUND OUT NO 2CH AUDIO OUT NO 2CH AUDIO OUT WAVEFORM IC302 IC303 are defective A V out bad X301 is defective No power on Q302 303 are defective Component Y out defective Q301 304 are defective Y C out is defective IC307 is defective Component out bad ...

Page 31: ...4 1 ...

Page 32: ...CH R SIGNAL 00 01 17 R10539B DVD3351ND S Q401 is defective 2CH Audio out bad IC404 is defective Audio bad IC4M1 is defective Mic input bad IC403 Q404 are defective Digital data out bad IC402 is defective 2CH Audio out bad IC401 is defective 2CH Audio out bad ...

Page 33: ...H ROM DRAM MAIN CPU E X P A N D E R EEPROM CPLD OPEN OPEN 00 03 28 R10537B DVD3351ND S Audio output is unstable Servo will not operate X501 No Power on Video output level is unstable Open Close Error Servo will not operate FLD Error ...

Page 34: ...7 DIGITRON KEY CIRCUIT DIAGRAM 2 32 2 33 ...

Page 35: ...8 JACK CIRCUIT DIAGRAM 2 34 2 35 ...

Page 36: ...LOCATION GUIDE BOTTOM SIDE TOP SIDE ...

Page 37: ...2 POWER P C BOARD 2 38 2 39 ...

Page 38: ...3 AV P C BOARD 2 40 2 41 ...

Page 39: ...4 FRONT P C BOARD 2 42 2 43 ...

Page 40: ...ND CAPACITORS PARTS LIST HOW TO USE THIS PARTS LIST 1 This Parts List lists those parts which are considered necessary for repairs Other common parts such as resistors and capacitors are listed in the Common List for Service Parts from which these parts should be selected and stocked 2 Parts not shown in the Parts List and Common List for Service Parts will not in principle be supplied 3 How to re...

Page 41: ... J R912 KRD20TJ103T RES CARBON 10K OHM 1 5W J R916 KRD20TJ152T RES CARBON 1 5K OHM 1 5W J R919 KRD20TJ222T RES CARBON 2 2K OHM 1 5W J R922 KRD20TJ472T RES CARBON 4 7K OHM 1 5W J R924 KRD20TJ822T RES CARBON 8 2K OHM 1 5W J R925 R926 KRD20TJ103T RES CARBON 10K OHM 1 5W J R927 KRD20TJ473T RES CARBON 47K OHM 1 5W J R929 KRD20TJ103T RES CARBON 10K OHM 1 5W J R931 KRD20TJ331T RES CARBON 330 OHM 1 5W J R...

Page 42: ...TJ222T RES CARBON 2 2K OHM 1 5W J R521 KRD20TJ821T RES CARBON 820 OHM 1 5W J R525 KRD20TJ222T RES CARBON 2 2K OHM 1 5W J R527 R528 KRD20TJ560T RES CARBON 56 OHM 1 5W J R531 R532 KRD20TJ101T RES CARBON 100 OHM 1 5W J R533 R534 KRD20TJ221T RES CARBON 220 OHM 1 5W J R535 R536 KRD20TJ104T RES CARBON 100K OHM 1 5W J R537 KRD20TJ221T RES CARBON 220 OHM 1 5W J R538 KRD20TJ104T RES CARBON 100K OHM 1 5W J ...

Page 43: ... 0DS202009CA DIODE SWITCHING DAN202K TP ROHM KOREA SOT23 80 L204 6200HJC102A FILTER CIRC EMI HB 1M2012 102JT CERATECH TP 3K R217 0RH0102C622 RESISTOR CHIP 10 1 16W 5 D R TP R2B4 R2B5 0RH0182C622 RESISTOR CHIP 18 1 16W 5 D R TP R2C8 R2C9 0RH0182C622 RESISTOR CHIP 18 1 16W 5 D R TP R275 R276 0RH9100C622 RESISTOR CHIP 910 OHM 1 16 W 1608 5 D R T R230 R237 0RH1000C622 RESISTOR CHIP 100 1 16W 5 D R TP ...

Page 44: ... Y5V F 1508 R TP C2C5 C2D0 0CH1104K942 CAPACITOR CHIP CERAM 0 1UF 50V Z Y5V F 1508 R TP C2D6 C2D7 0CH1104K942 CAPACITOR CHIP CERAM 0 1UF 50V Z Y5V F 1508 R TP C2M8 0CH1104K942 CAPACITOR CHIP CERAM 0 1UF 50V Z Y5V F 1508 R TP R219 R220 0RH1002C622 RESISTOR CHIP 10K 1 16W 5 D R TP R2A0 R2N8 0RH1002C622 RESISTOR CHIP 10K 1 16W 5 D R TP R2Q1 0RH1002C622 RESISTOR CHIP 10K 1 16W 5 D R TP IC201 0IHY25801...

Page 45: ...ESISTOR CHIP 47K 1 16W 5 D R TP R576 R577 0RH4702C622 RESISTOR CHIP 47K 1 16W 5 D R TP IC504 0ISS241610B IC SAMSUNG ELECTRONIKS24L161CS8PSOPTPEEPROM16 C536 0CH7106F621 CAPACITOR CHIP TANTA 10UF 16V M 3528MM TP R505 0RH6802C622 RESISTOR CHIP 68K 1 16W 5 D R TP C505 0CH7106C611 CAPA CHIP TANTALUM 10UF 6 3V M 3216 TP IC204 DITO453000C IC TOSHIBA TC4W53FU SSOP 8PIN Q2M1 Q2M3 0TR103009AA TRANSISTOR CHI...

Page 46: ...08 R TP C256 C258 0CH1104K942 CAPACITOR CHIP CERAM 0 1UF 50V Z Y5V F 1508 R TP C285 C2A4 0CH1104K942 CAPACITOR CHIP CERAM 0 1UF 50V Z Y5V F 1508 R TP C2A6 C2A7 0CH1104K942 CAPACITOR CHIP CERAM 0 1UF 50V Z Y5V F 1508 R TP C2A9 0CH1104K942 CAPACITOR CHIP CERAM 0 1UF 50V Z Y5V F 1508 R TP C2B0 C2B2 0CH1104K942 CAPACITOR CHIP CERAM 0 1UF 50V Z Y5V F 1508 R TP C2D9 0CH1104K942 CAPACITOR CHIP CERAM 0 1U...

Page 47: ...22C677 RESISTOR METAL 62OHM 1 16 W 5 1608 R TP IC401 0IBB171600A IC BURR BROWN PCM1716E 28P SSOP TP DAC 2K R L401 L402 6200HJC102A FILTER CIRC EMI HB 1M2012 102JT CERATECH TP 3K R420 0RH1000C622 RESISTOR CHIP 100 1 16W 5 D R TP R402 0RH4701C622 RESISTOR CHIP 4 7K 1 16W 5 D R TP R407 0RH6801C622 RESISTOR CHIP 6 8K 1 16W 5 D R TP C401 C408 0CH1104K942 CAPACITOR CHIP CERAM 0 1UF 50V Z Y5V F 1508 R TP...

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Page 54: ...73A GEAR WHEEL TRAY 021 4470R 0074A GEAR TRAY 022 6871R 3024A PWB PCB ASSY TOTAL DPM1 TRAY 023 4580R 0006A ROLLER BASE TRAY 024 4681R 0010A MOTOR ASSY TRAY 025 3040R 0032A BASE TRAY DPM1 026 3390R 0008A TRAY DISC DPM1 030 3040R 0031A BASE MAIN DPM1 031 4470R 0069A GEAR SLIDER 032 4470R 0067A GEAR MAIN 033 4470R 0070A GEAR EXCHANGE 034 4470R 0068A GEAR UP DOWN 035 4470R 0071A GEAR LOADING 036 4681R...

Page 55: ...SERVICE MANUAL DVD VIDEO CD CD PLAYER L55 NAD ELECTRONICS INTERNATIONAL LONDON NAD 2001 ...

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