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RTV servis Horvat
Tel: ++385-31-856-637 Tel/fax: ++385-31-856-139 Mob: 098-788-319
www.rtv-horvat-dj.hr
10. TROUBLE SHOOTING CHARTS
10-1. NO RASTER
CHECK MAIN B+ ( 123V LINE ) NG. I806 6Vout ? Q803 BASE = H ? NG. SW08,P803 SOLDER ? TOP210 PIN VOLT ? D825~D828,F801,R803 ? NG. XN01,XN02,X701 OSC ? RN46,47,48'S PULSE ? IN01,I701 RESET = H ? NG. DECK SEPERATION OK DECK EXCHANGE NG 5V VCC VOLT ? PATTERN SHORT ? IN01,I701 EXCHANGE ? OK PA805 VCR H = H ? OK CHECK HEAT VOLTAGE, 16.5V, 45V, 190V LINE NG CHECK H DRIVE PULSE AT PIN3 OF PA406 NG OK PA406 MON. ON = H ? NG. I701 EXCHANGE CHECK DATA,CLOCK AT PIN 7,8 OF I501. CHECK PULSE AT PIN 6,13,38 OF I501. OK CHECK PULSE R,G,B,FB AT PIN 18,19,20,21 OF I501 OK OK CHECK D811 ~ D815 CHECK I802,804,805 CHECK CONNNECTOR PA904 P401,PA408 CHECK H.VCC AT PIN 37 OF I501 X501,X502 OSC OK ? OK CHECK Q401,Q402,T401,C418 R401,R402,R407,R409 I301,D301,D302 OK
CHECK T801 SECONDARY VOLTAGE 8.5V,14V,13.5V ? NG CHECK I801 #9 VOLT I801 #7, #1 VOLT CHECK R817,D801~D804 EXCHANGE I801
OK
OK
10-2. NO OSD DISPLAY
CHECK H,V SYNC SIGNAL AT PIN 45,46 OF I701
NG CHECK V SYNC OF P405.
NG CHECK H SYNC (SC) OF PA405
OK CHECK OSD OSC PULSE.
NG CHECK I301 AND ADJACENT CIRCUIT.
NG CHECK D501 CHECK CONNECTOR (PA406) AND PATTERN
NG CHECK L,C or I701
OK CHECK 23,24,25,26 PULSE AND VOLT NG CHECK BRIGHT,CONTRAST CONTROL = MINIMUM ?
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10-3. NO PICTURE(RASTER OK)
CHECK VIDEO SIGNAL AT PIN6 OF I501 (TDA8374)
NG CHECK DATA,CLOCK AT PIN7,8 OF I501 ( TDA8374 ) OK CHECK SIGNAL AT PIN48, 49 OF I501 ( TDA8374 ) NG CHECK I701 AND ADJACENT PATTERN.
OK CHECK VIDEO SIGNAL AT PIN13 OF I501 ( TDA8374 ). NG CHECK QC504, QC512 OK CHECK R-Y, B-Y IN/OUT AT PIN 29, 30, 31, 32 OF I501 OK CHECK SIGNAL AT PIN 18,19,20,21 OF I501
OK CHECK TUNER VCC, DATA CLOCK,MODULE RF(ANT01) NG CHECK I502, I503 AND VCC
10-4. NO COLOUR
CHECK R-Y,B-Y SIGNAL AT PIN 31,32 OF I501. (TDA8374)
OK CHECK R,G,B SIGNAL AT PIN 19,20,21 OF I501
NG CHECK R-Y, B-Y SIGNAL AT PIN 29,30 OF I501
OK CHECK / REPLACE I901, I902 I903 ( CRT BOARD )
NG CHECK / REPLACE I501 ( TDA8374 )
OK CHECK / REPLACE I502 ( TDA4665 )
NG CHECK X501,X502 CC523,CC524,CC534 CC503,RC543 NG CHECK / REPLACE I503 ( TDA8395 ) ( SECAM ) NG CHECK SIGNAL AT PIN38 OF I501.
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10-5. NO SOUND
CHECK AUDIO SIGNAL AT PIN 15 OF I501 (TDA8374)
NG CHECK VOLUME CONTROL VOLTAGE ? CHECK SIGNAL AT PIN 1 OF I501 OK NG CHECK QC505,Z501,Z502 OK CHECK SIGNAL AT PIN 55 OF I501. I701 20 PIN = H ? IN01 56 PIN = H ? CHECK QCY17,QC601 AND ADJACENT CIRCUIT
OK CHECK VOLTAGE AT PIN 2,3 OF I601
NG SPEAKER ? SPEAKER CONNECTOR ?
10-6. NO EXTERNAL AV
SCART JACK INPUT CHECK SIGNAL AT PIN 23,24,25 OF I501. RCA JACK INPUT CHECK SIGNAL AT PIN 11 OF I501.
OK CHECK SWITCHING VOLTAGE ABOUT 2.2V AT PIN 26 OF I501.
NG CHECK SCART JACK AND PATTERN.
OK CHECK AT PIN 19 OF I701 = H ?
NG CHECK SCART JACK AND PATTERN.
NG CHECK QC511 AND ADJACENT CIRCUIT.
OK CHECK I701 AND ADJACENT CIRCUIT.
OK CHECK / REPLACE I501.
OK CHECK / REPLACE I501.
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10-7. SERVO-SYSCON CIRCUIT
A.
PLAYBACK PICTURE IS NOT GOOD. ADJUST TRACKING
NOISE APPEARS ALTHOUGH ADJUSTING TRACKING.
NG
NOISE APPEARS ALTHOUGH CHANGE CASSETTE TAPE.
OK
CHECK AND RE-ADJUST THE PATH OF DECK.
OK IS CTL PULSE OUTPUT AT P1N 92 OF IN01. NG CTL HEAD HEIGHT IS NORMAL AND THERE IS NOT DUST ? NG ADJUST THE HEAD HEIGHT AND REMOVE DUST ?
OK OK IS CTL PULSE INPUT AT P1N 91 OF IN01. NG CHECK QCN05, CCN52 , CCN15, RCN35, CN59, CN34, CN35.
CHECK CONNECTOR PAY03
OK THE VOLTAGE OF PIN 2 OF IN01 NOT CHANGING ? NG CHECK CN01,RCN01
OK CHECK IN01
B.
PLAYBACK PICTURE IS NOT GOOD.
NOISE APPEARS ON THE SCREEN ON THE WHOLE
NG
NOISE APPEARS ON THE SCREEN AT THE BOTTOM.
NG CHECK FLOW A. OK ADJUST THE PG IN SVC MODE CHECK CONNECTOR PY04. CHECK DRUM P.G INPUT. CHECK PATTERN.
OK ARE SW PULSE AND HA SW APPLIED TO PREAMP CIRCUIT NG IS SW PULSE SUPPLIED FROM PIN 18 OF IN01. NG OK
OK IS ENVE. WAFEFORM SUPPLIED TO PIN4 OF PY04 NG CHECK CONNECTOR, HEAD-AMP AND HEAD DUST NG CHANGE DRUM ASS'Y
OK CHECK VIDEO CIRCUIT.
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C.
AUTO-STOP DURING PLAYBACK.
IS REEL PULSE APPLIED TO PIN 81 AND 82 OF IN01 ? OK IS DRUM F.G APPLIED TO PIN 87 OF IN01 ? OK CHECK IN01.
NG
CHECK REEL SENSOR.
NG
CHECK CONNECTOR AND DRUM F.G CIRCUITS.
D.
DRUM MOTOR LOADING STOP.
IS MOTOR 12V SUPPLIED IN03 7,8 PIN 12V ? OK S 6.2V SUPPLIED TO PIN 4 OF IN03 OK CHANGE IN03 OK CHECK CONNECTOR AND MOTOR
NG
CHECK POWER MODULE
NG CHECK DN05
NG
CHECK PAN01 AND LOADING MOTOR
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E.
CAPSTAN MOTOR LOADING STOP.
NG IS MOTOR VCC SUPPLIED ? OK IS THE INPUT OF PIN 6 OF PN03 2.5V ~ 3.5V ? OK IS PIN 4 OF PN03 2.5V ? OK DOES PIN 77 OF IN01 SUPPLY CAPSTAN PWM. OK CHECK CONNECTOR AND MOTOR. NG CHECK IN01, RCN10, RCN11 NG CHECK CIRCUIT OF RN12, RN33, RN44 CHECK POWER MODULE.
NG CHECK RCN31, RCN32
F.
DRUM MOTOR AND CAPSTAN MOTOR ROTATE AT REGULAR SPEED. ( IN REC MODE )
IS C.SYNC APPLIED TO PIN 84 OF IN01. OK CHECK MOTOR.
NG
CHECK C.SYNC OF VIDEO IC AND PATTERN.
G.
EMERGENCY MODE WHEN PLUGGING (POWER CORD) NG
IS EVER 5V APPLIED ? OK DOES XN02 OSCILLATOR ? OK IS CAM SW DATA CORRECT ? OK CHECK IN03 OK CHECK IN01
CHECK POWER MODULE
NG
CHECK IN01 AND XN02
NG
RECHECK CONNECTOR AND CAM SW CONTACT.
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H.
CASSETTE IS NOT INSERTE
OK IS MOTOR VCC SUPPLIED ? ( AT PIN 7 OF PA805 ) NG CHECK POWER MODULE ?
OK CAM DATA IS CHANGED WHEN CST IN ? NG CHECK CONNECTOR NG OK IS 5V APPLIED TO PIN 5 OF IN03 WHEN CST IN ? NG CHECK DECK PART. IS 5V SUPPLIED AT PIN 45 OF IN01 ?
OK CHECK IN03
OK CHECK IN01
NG CHECK PATTERN
10-8. VCR AUDIO CIRCUIT(NORMAL)
A. TROUBLE SHOOTING OF PB MODE
NO SOUND IN THE PLAYBACK MODE
IS THE OUTPUT AT PIN 77 OF IY01 ?
NG
IS 5V APPLIED TO PIN 76 OF IY01 AND IS 5.8V APPLIED TO PIN 2 OF TY01 ?
NG
CHECK POWER CIRCUIT
OK CHECK A/V SELECT CIRCUIT
OK IS LESS THAN 0.2V AT PIN 80 OF IY01 ? NG IS CLOCK AND DATA APPLIED TO PIN 63,64 OF IY01? NG CHECK SYSCON OK OK NG CHECK QCY09,QCY10, QCY12
IS COLLECTOR OF QCY10 GND ?
OK CHECK PATTERN AND AC HEAD.
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B. TROUBLE SHOOTING OF REC MODE.
NO SOUND IN THE PLAYBACK MODE AFTER RECORDING
IS SIGNAL INPUT INTO PIN 71,73 OF IY01. OK IS 5V APPLIED TO PIN 76 OF IY01 AND IS ABOUT 5.7V APPLIED TO PIN 2 OF TY01 OK IS THE VOLTAGE ABOVE 4V AT PIN 80 OF IY01 ? OK IS SIGNAL INPUT INTO PIN 79 OF IY01 ? OK DOES PIN 6 OF TY01 OSCILLATE ?
NG
CHECK A/V SELECT CIRCUIT.
NG CHECK SYSCON.
NG
IS CLOCK AND DATA APPLIED TO PIN 63,64 OF IY01 ?
NG CHECK SYSCON.
NG
CHECK RCY37, RCY38, CCY27. OK
NG
CHECK IY01.
NG NG AC SIGNAL IS PUT ON THE DC VOLTAGE AT PIN 5 OF IY01. OK CHECK AC HEAD.
NG
IS THE VOLTAGE FROM 0.7V TO 3.0V AT PIN 5 OF IY01 ?
OK IS THE VOLTAGE FROM 0.7V TO 0.8V AT PIN 6 OF IY01 ? NG IS THE VOLTAGE HIGHER THAN 3.0V AT COLLECTOR OF QCY06 ?
OK AC SIGNAL PUT ON 70KHz AT BASE OF QY04.
OK CHECK IY01. NG
OK CHECK QCY06
NG CHECK IY01.
OK CLEAN HEAD.
OK CHECK RY21, RY22, TY01, CCY47.
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10-9. VCR VIDEO CIRCUIT
A. TROUBLE SHOOTING OF PREAMP IN THE PLAYBACK MODE.
IS THE SIGNAL FROM HEADS FED TO PIN1 AND PIN3 (LP MODE) OR PIN 5 AND PIN 7 (SP MODE) OF PAY01. OK IS ON/OFF 5V FROM PIN 76 OF IY01 SUPPLIED TO PIN 13 OF IY04 AT 5VOLTS ? NG CHECK ON/OFF 5V
IY04 : LA70001
NG CHECK DRUM AND DECK MECHANISM.
OK IS REC (H) FROM PIN 19 OF IY01 SUPPLIED TO PIN 11 OF IY04 AT ZERO VOLTS ? NG CHECK REC (H)
OK IS H.AMP SW FROM PIN 16 OF IN01 SUPPLIED TO PIN 3 OF IY04 ? NG CHECK H.AMP SW
OK IS VIDEO SW FROM PIN 18 OF IN01 SUPPLIED TO PIN 4 OF IY04 ? NG CHECK VIDEO SW
OK IS TRICK(H) FROM PIN 21 OF IY01 SUPPLIED TO DN07 AT ZERO VOLT ?` NG CHECK TRICK (H)
OK IS THE SIGNAL FROM PIN1 AND PIN3 (LP MODE) OR PIN5 AND PIN7 (SP MODE) OF PAY01 FED NG CHANGE IY04
OK IS THE SIGNAL FROM PIN7 OF IY04 FED TO C354 ? NG CHECK PB EQ
OK CHECK VIDEO CIRCUIT
REC(H) : "HIGH" IN THE RECORD MODE
"LOW" IN THE EE AND PB MODE H.A SW : "HIGH" IN THE LP MODE "LOW" IN THE SP MODE TRICK(H) : "HIGH" IN THE TRICK PLAY
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B. TROUBLE SHOOTING OF PREAMP IN THE RECORD MODE.
IY04 : LA70001
IS THE Y-FM SIGNAL FROM PIN 18 OF IY01 FED TO PIN9 OF IY04 ? NG CHECK RY48, CCY05 AND PCB PATTERN.
OK IS THE DOWN CONVERTED COLOUR SIGNAL FROM PIN 14 OF IY01 FED TO PIN 10 OF IY04 ? NG CHECK CCY04 AND PCB PATTERN.
OK IS ON/OFF 5V SUPPLIED TO PIN 13 OF IY04 AT 5 VOLTS ? NG CHECK ON/OFF 5V
OK IS REC(H) SUPPLIED TO PIN 11 OF IY04 AT 5 VOLTS ? NG CHECK REC (H)
OK IS TRICK (H) SUPPLIED TO PIN 1 OF IY04 AT ZERO VOLTS ? NG CHECK TRICK (H)
OK IS THE SIGNAL FROM PIN9 AND PIN 10 FED TO PIN 22 (SP MODE) AND PIN17 (LP MODE) OF IY04 ? NG CHECK IY04.
OK CHANGE DRUM
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C. TROUBLE SHOOTING OF LUMINANCE SIGNAL IN THE RECORD MODE.
IS THE VIDEO SIGNAL FROM PIN 24 OF IY01 ? NG CHECK PCB PATTERN AND ADJACENT CIRCUIT.
OK IS ON/OFF 5V SUPPLIED TO PIN 36 AND PIN 47 OF IY01 AT 5 VOLTS ? NG CHECK ON/OFF 5V
OK IS THE LUMINANCE SIGNAL FROM PIN 25 OF IY01 FED TO PIN 26 OF IY01 ? NG CHECK QCY03, RCY02, RCY39, CCY46, CCY70.
OK IS THE LUMINANCE SIGNAL FROM PIN 26 OF IY01 FED TO PIN 18 OF IY01 ? NG IS TRICK (H) SUPPLIED TO ANODE OF DN07 AT 0 VOLT ?
OK CHECK IY01
NG CHECK TRICK (H)
OK IS THE MODULATING LUMINANCE SIGNAL FROM PIN 18 OF IY01 FED TO PIN 9 OF IY04 ?IY01 ? NG CHECK RY48, CCY05
OK TO PREAMP CIRCUIT
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D.TROUBLE SHOOTING OF PAL COLOUR IN THE RECORD MODE.
IS THE VIDEO SIGNAL FROM PIN 35 OF IY01 ? NG CHECK PCB PATTERN AND ADJACENT CIRCUIT.
OK IS ON/OFF 5V SUPPLIED TO PIN 36 AND PIN 47 OF IY01 AT 5 VOLTS ? NG CHECK ON/OFF 5V
OK IS THE DOWN-CONVERTED COLOUR SIGNAL OBTAINED FROM PIN 14 OF IY01 ? NG CHECK IY01.
OK IS THE DOWN-CONVERTED COLOUR SIGNAL FROM PIN 14 OF IY01 FED TO PIN 7 OF IY04 THROUGH BUFFER QCY08, QCY11 ? NG CHECK QCY08, QCY11 AND ADJACENT CIRCUIT.
OK TO PREAMP CIRCUIT.
E.TROUBLE SHOOTING OF SECAM COLOUR IN THE RECORD MODE.
IS THE VIDEO SIGNAL FROM PIN 35 OF IY01 ? OK IS ON/OFF 5V SUPPLIED TO PIN 5 AND PIN 17 OF IY03 AT 5 VOLTS ? OK IS THE SIGNAL FROM PIN 24 OF IY03 FED TO PIN 12 OF IY03 AND 12dB AMP CIRCUIT ? OK IS THE SIGNAL FROM COLLECTOR OF QCL07 FED TO PIN 10 OF IY04 ? OK TO PREAMP CIRCUIT. NG CHECK QCL05, QCL07, CCL17, RCL12 NG CHECK IY03 AND 12dB AMP CIRCUIT. NG CHECK ON/OFF 5V NG CHECK PCB PATTERN AND ADJACENT CIRCUIT.
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F. TROUBLE SHOOTING OF LUMINANCE IN THE PLAYBACK MODE.
IS Y-FM SIGNAL FROM PIN 7 OF IY04 FED TO PIN 15 OF IY01 ? NG CHECK PREAMP CIRCUIT
OK IS ON/OFF 5V SUPPLIED TO PIN 36 AND PIN 47 OF IY01 AT 5 VOLTS ? NG CHECK ON/OFF 5V
OK IS THE LUMINANCE SIGNAL FROM PIN 15 OF IY01 FED TO PIN 25 OF NG CHECK QCY07, LY08, LY06, CCY93, CCY42, CCY92, RCY52.
OK IS THE LUMINANCE SIGNAL FROM PIN 25 OF IY01 FED TO PIN 26 OF NG CHECK QCY03, RCY53, RCY39, CCY70, CCY46, RCY02.
OK IS THE LUMINANCE SIGNAL FROM PIN 26 OF IY01 FED TO PIN 38 OF NG CHANGE IY01
OK TO TV PART.
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G. TROUBLE SHOOTING OF PAL COLOUR IN THE PLAYBACK MODE.
IS THE SIGNAL FROM PIN 7 OF IY04 FED TO PIN 15 OF IY01 ? NG CHECK PREAMP CIRCUIT
OK IS THE PAL COLOUR SIGNAL FROM PIN 7 OF IY04 FED TO PIN 15 OF IY01 THROUGH AMP CIRCUIT ? NG CHECK AMP CIRCUIT
THE AMP CIRCUIT CONSIST OF
QCY08, QCY11 AND ADJACENT CIRCUIT. NG
OK IS ON/OFF 5V SUPPLIED TO PIN 36 AND PIN 47 OF IY01 AT 5 VOLTS ? CHECK ON/OFF 5V
OK IS THE PAL COLOUR SIGNAL FROM PIN 15 OF IY01 FED TO PIN 48 AND PIN 50 OF IY01 ? NG CHECK IY01
OK IS THE SIGNAL FROM PIN 48 AND PIN 50 OF IY01 FED TO PIN 3 AND PIN 1 OF IY02 RESPECTIVELY ? NG CHECK IY01
OK IS THE SIGNAL OBTAINED FROM PIN 13 OF IY02 ? NG CHECK IY01
OK IS THE COLOUR SIGNAL FROM PIN 13 OF IY02 FED TO PIN 45 AND THROUGH PIN 52 AND 46 OF IY01 ? NG CHECK IY01, QCY01, RCY08, CY18.
OK IS COLOUR ROTARY SUPPLY TO PIN 66 OF IY01 ? NG CHECK COLOUR ROTARY
OK TO TV PART.
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H. TROUBLE SHOOTING OF SECAM COLOUR IN THE PLAYBACK MODE.
IS THE SIGNAL FROM PIN 7 OF IY04 FED TO PIN 15 OF IY01 ? NG CHECK PREAMP CIRCUIT
OK IS THE SIGNAL FROM PIN 7 OF IY04 FED TO PIN 21 OF IY01 THROUGH PB AMP AND 1.1MHz BPF ? NG CHECK PB AMP CIRCUIT AND IY03
THE AMP CIRCUIT CONSIST OF
OK IS ON/OFF 5V SUPPLIED TO PIN 5 AND PIN 17 OF IY01 ? NG QCY08, QCY11 AND ADJACENT CIRCUIT. CHECK ON/OFF 5V
OK IS SECAM COLOUR SIGNAL FROM PIN 21 FED TO PIN 12 OF IY01 THROUGH PIN 14 AND 12dB AMP CIRCUIT ? NG
CHECK 12dB AMP CIRCUIT.
THE 12dB AMP CIRCUIT CONSIST OF
QCL07,RCL33,RCL34,RCL36,CCL35
OK IS C.SYNC ( COMPOSITIVE SYNC ) SUPPLIED TO PIN 9 OF IY03 ? NG CHECK C.SYNC
OK IS THE SIGNAL FROM PIN 12 FED TO PIN 15 OF IY03 ? NG CHECK IY03.
OK IS THE SIGNAL FROM PIN 15 OF IY03 FED TO PIN 46 OF IY01 ? NG CHECK CCL17,QCL05,RCL12 AND SECAM (H)
OK TO TV PART.
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