Eiki LC-NB3E service manual No Sound, Lens Motor Problems

Page 39

Troubleshooting

No Sound

1. No audio signals at AV input circuit.

Check audio signals at pins14 and 15 of IC5011 on AV Board. Check IC5011 and peripheral circuits.

2.Incorrect operation of VIDEO/COMPUTER mode switching.

Check AV/PC switching signal at pins 10 and 11 of IC5011. Check IC5011, IC801 and switching signal.

AV : Low, PC : High

3.No audio output signal at speaker.

Check audio signal at pins 1 and 3 of K8F on Main Board. Check MUTE signal at pin 4 of IC031.

Mute On : High

Check MUTE signal at pin 7 of IC1831, pins 7 and 13 of IC1881, and peripheral circuit.

Mute On : High

Check sound volume signal at pins 27, 28 of K10U, and pin 14 of IC1831.Check IC IC001, IC031 and peripheral circuit.

Volume Min.: Low

4.No power supply at audio circuit.

Check 6V(6V AUDIO) power supply line.

AV BOARD

 

IC5011

 

 

 

 

 

AV SUB BOARD

 

IC2161

 

MAIN BOARD

 

 

 

 

 

 

IC001

IC031

 

D/A

 

 

 

 

 

AUDIO-SW

Q5072

Q5071

 

 

 

 

 

Q1817

 

 

 

 

AUDIO

 

 

 

 

 

 

 

10

 

 

AUDIO

 

 

 

 

Q1817

COMPUTER

PC_L/R

 

 

AV/PC

 

 

PRE-AMP.

CONTROL

 

 

 

SCL2_5

 

1

11

 

 

K10X

 

77

13

79,78

 

 

 

 

SDA2_5

AUDIO IN

 

13

 

 

 

 

 

 

 

 

L

 

8

 

 

 

 

 

15

 

Q5031

3

Q011

 

5

17

18

 

 

 

 

 

 

 

 

1, 7

 

AV/PC

 

 

 

 

 

 

14

 

Q5042

4

Q021

 

 

R

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

VIDEO

AV_L/R

2

 

 

 

 

 

 

14

13

 

 

 

 

 

AUDIO IN

 

12

 

 

K10Y

 

 

2

2, 6

 

4

 

 

 

 

 

 

 

9

 

 

 

 

 

PC: H

 

 

IC801

 

 

Q2051

 

 

 

 

 

 

 

MUTE

 

 

 

 

 

 

 

 

7

 

 

 

 

 

AV: L

 

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

SUB

EXTERNAL

 

 

 

 

 

8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

IC1831

 

CPU

SPEAKER

 

 

 

 

 

11

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

K10U

 

K3U

 

 

D/A

 

 

 

 

 

 

 

AV/PC

29

 

 

 

 

 

Q1818

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30

 

 

 

 

 

 

 

 

 

 

 

 

 

VOLUME

 

 

 

14

 

 

Q1819

 

 

 

 

 

 

 

27

 

 

 

 

SCL1_5

 

 

 

 

 

 

 

 

 

28

 

 

 

 

2

80,81

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

SDA1_5

 

 

 

 

 

 

 

MUTE On: H

 

MUTE

 

AUDIO MUTE

 

 

 

 

 

 

 

 

31

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

32

 

7

13

7

 

 

 

 

 

 

 

 

 

 

 

 

21

 

 

 

MUTE On: H

 

 

 

 

 

 

 

 

 

 

 

 

 

K8F IC1881

 

 

 

 

 

 

 

 

 

 

 

 

 

24

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1,3

BUFFER

 

 

 

 

SPEAKER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lens Motor Problems

1.No drive signals supplied at motors

Check drive signals at pins 1 to 4 of K6U on Power Board. Check ICs IC5501, IC5551 and peripheral circuits. Check motor drive power supply (9VMCI).

2.No drive signals supplied at motor drive ICs.

Check drive signals at pins 3-4 (ZOOM), 5-6 (FOCUS) of k6S. Check IC801.

3.No drive signals output from CPU.

Check drive signals at pins 29,30, 33, 34 of IC801(SUB CPU). Check IC801.

4.No key switch signals input to CPU.

Check signals at pins 50 to 52 of IC801 when pressing the key buttons. Check key buttons.

Logic Table of IC5501/IC5551

 

Input

Output

 

Operation

4

 

5

7

 

1

 

H

 

L

L

 

H

Forward drive

L

 

H

H

 

L

Reverse drive

H

 

H

L

 

L

Braking

L

 

L

-

 

-

Stand by

 

 

 

 

 

 

 

FOCUS MOTOR

M

ZOOM

MOTOR

M

1

2

3

4

 

 

 

 

 

 

 

 

 

 

 

Power

 

LEVEL +

 

 

15V

 

Supply

 

LEVEL -

 

 

 

 

Circuit

 

KEY SW BOARD

Q65A

 

 

 

 

 

 

 

 

 

Q65B

Q65C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IC1881

 

 

 

 

ON: H

 

BUFFER

 

 

9V MCI

IC5551

 

 

 

POWER

 

5V_SW

15

3

17

1

 

FOCUS

16

ON: H

 

MOTOR DRIVE

 

 

 

 

 

 

 

 

 

 

 

K6U

 

 

3

 

 

K6S K8S

FOCUS +

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

4

 

 

6

 

33

52

 

 

 

 

 

 

FOCUS -

 

 

 

7

5

 

 

5

 

34

51

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IC801

50

 

 

 

 

 

 

 

 

 

 

 

 

 

IC5501

 

 

 

 

 

 

SUB CPU

 

 

 

 

ZOOM

 

 

 

 

 

 

 

 

 

 

MOTOR DRIVE

 

 

 

 

 

 

 

 

 

3

4

 

 

 

 

ZOOM +

 

 

 

 

 

1

 

 

4

 

29

 

 

 

 

 

 

 

ZOOM -

 

 

 

 

7

5

 

 

3

 

30

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

POWER BOARD

FOCUS

ZOOM

K68A

3

4

5

 

 

 

 

 

 

 

 

3

4

5

 

 

K8A

MAIN BOARD

-39-

Page 38 Page 40
Image 39
Page 38 Page 40
Contents Chassis No. MM8-NB3E00 Model No. LC-NB3EContents Safety Precautions Safety InstructionsSpecifications Optical Adjustments Electrical Adjustments Adjustments after Parts ReplacementFuse Circuit ProtectionsRecommendation Mechanical Disassemblies Cabinet Top and Control Panel removalMain Board removal AV, AV Sub Board and Speaker removal Front Panel and R/C Board removalAV board AV Sub board Lamp Ballast Unit removal Filter Board removalFilter board Power Box Cover and FansFN901, FN906 removal 1Optical Unit removalAB B 2Optical Unit removal Power and P.F. Board removalInterlock Switch lever Fan FN905 removalOff from the Cabinet Bottom Fan duct top FN904 FN903 FN902 Integrator Lens-In disassembly Optical Parts DisassembliesProjection Lens removal Condenser Lens-Out disassembly Condenser lens disassemblyPolarized Glass-In removal Relay Lens-Out disassemblyOptical Unit Top removal Polarized Glass-Out removalKey No. Description Locations and DirectionsLCD Panel/Prism Ass’y removal LCD Panel/Prism Ass’y ReplacementImportant Notice on LCD Panel/Prism Assy Replacement Mounting ProcedureOrder Replacement Lamp Lamp ReplacementHow to reset Lamp Replace Counter How to check Lamp Replace CounterSlot B Optical AdjustmentsContrast adjustment Before AdjustmentGreen b Slot B Moving of slot B Slot D Moving of Slot D Condenser Lens adjustmentCyan a Slot B Moving of slot B Moving of slot D Condenser Lens-Out adjustmentRelay lens-Out adjustment White a Slot B a Moving of slot BSlot D Moving of slot D IC1801 is not defective Electrical AdjustmentsAdjustment Condition Output Voltage adjustmentFan Voltage adjustment Pedestal adjustmentSignal Center Adjustment NRS adjustmentSignal Center adjustment Black Level adjustmentGain Adjustment PC Offset adjustmentPC Gain adjustment Offset AdjustmentCommon Center adjustment AV Gain adjustmentGamma Shift adjustment White Balance adjustmentService Adjustment Data Table Adjustment Item Initial Value Range Description Initial Value Range Description Group 500 ADC IC301 Troubleshooting No PowerAbnormality occurs on the power circuit Power Board Main Board No picture from all of sources No PictureNo picture from Video source No picture from both of Video and Computer sourcesAV/PC-RGB-SW Video Signal processing diagramsNo Sound Lens Motor ProblemsSystem Control & I/O Port Table IC801 Control Port FunctionsMD2 IIC Bus I/O Expander IC1851 Port Functions IIC Bus I/O Expander IC2181 Port FunctionsIIC Bus DA Converter IC1831 Port Functions IIC Bus DA Converter IC2161 Port Functions IIC Bus DA Converter IC1581 Port FunctionsIIC Bus DA Converter IC2571 Port Functions Waveforms VIDEO-INDrive TP52R/TP201R Drive TP52G/TP201G Drive TP52B/TP201G Ballast SW TP28L Sync OUT IC4101-29 Sync OUT IC4101-28Sync in TP205 Sync Drive TP62H Sync Drive TP62V DHS Tpdhs DVS TpdvsCleaning with air spray Disassembly Cleaning CleaningIC Block Diagrams BA7078AF Selector, IC6241 CXA2101AQ RGB Matrix, IC4101 IC Block Diagrams IC Block Diagrams ML60851 USB I/F, IC9801 M62393 D/A, IC2571 TB1274AF Video Decoder, IC1101 TA1318N AFC Detector, IC6171 IC Block Diagrams Page Read Description in the parts list Electrical Parts ListOUT of Circuit Board Assemblied Boards BoardKEY SW Board Power Board 610 299 7293 ASSY,PWB,POWER MM8B1AA0B10C352DA Fusible RES 22 JH Line Filter Board 610 294 1708 ASSY,PWB,LINE Filter MS6AAV Board IC LT1399CS FILTER,EMI 100MHZ AV SUB Board 610 297 1804 ASSY,PWB,AV SUB MD8A1AA0B10C3700B Main Board 610 297 1828 ASSY,PWB,MAIN ME8B1AA0B10C371AA IC TB1274AF IC AD8183ARU C2103 C406 C568 Network 0X4 1/16W R152 R2549 R3544 R457 FILTER,LP 7MHZ Accessories Temp Board610 297 1873 ASSY,PWB,TEMP ME8A 1AA0B10C3710B Key No. Part No Description Mechanical Parts List Cabinet Parts Optical Parts Optical Parts List 67 Red Green Blue Red 52-a Optical Parts List MM8-NB3E00 MM8-NB3E00 MM8-NB3E00 Key to better communications Canada
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