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TROUBLESHOOTING GUIDE

PLAYBACK PICTURE JITTERS
HORIZONTALLY

Replace CYLINDER MOTOR.

PLAYBACKPICTURE SHAKES

Replace CYLINDER MOTOR.

Replace CYLINDER MOTOR.

No

Is FG output level at pin 5
of CP1002 about 5V?

Replace IC1001.

No

Is the voltage at pin 3 of
CP1002 1.2V?

In playback, is the voltage
at pin 3 of CP1002 about 1.2V?
When sloeing CYLINDER,is
the voltage 3.8V?

No

Yes

Replace CYLINDER MOTOR.

Replace IC1001.

No

No

Yes

Yes

5V

Is FG Pulse output level at
pin 5 of CP1002 about 5V?

5V

Yes

Yes

Does pin 11 of IC1001
output a 4.4Vp-p square
wave?

PLAYBACK PICTURE SHAKES

In playback, is the voltage at
pin 3 of CP1002 about 1.2V?
When slowing CYLINDER, is
the voltage 3.8V?

E-14

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Summary of Contents for VX-T1480

Page 1: ...FORE ATTEMPTING TO REMOVE OR REPAIR ANY PCB UNPLUG THE POWER CORD FROM THE AC SOURCE Fig 1 4 1 5 MAIN PCB Refer to Fig 1 5 1 Remove the 5 screws 1 2 Unlock the 2 supports 2 and remove the TV Main PCB...

Page 2: ...he Polyslider Washer 1 2 Remove the Center Pulley 3 Remove the Polyslider Washer 2 4 Remove the Center Pulley Spring 5 Remove the Idler Arm Ass y 6 Remove the 2 Polyslider Washers 3 7 Remove the Clutc...

Page 3: ...adjust the tension post position Refer to item 1 2 for the tension arm install the cassette type torque tape JG100A and set to the PLAY mode 2 Confirm that the left hand side tension value of the torq...

Page 4: ...ng press both VOL DOWN key on the set and the channel button 4 on the remote control simultaneously and adjust the Tracking button until the arising to the down of the Head Switching Pulse becomes 6 5...

Page 5: ...ton 1 on the remote control 4 Press the VOL UP DOWN button on the remote control until the white 25 is slightly brilliant 4 15 SUB COLOR TV 1 Receive the color bar pattern RF Input 2 Connect the oscil...

Page 6: ...AIWA VX T1480 OVD 5 Deck Alternative Parts Cont d...

Page 7: ...AIWA VX T1480 OVD 5 Deck Alternative Parts Cont d Earphone Diagram...

Page 8: ...0 S5 OP6 004 860 PULLEY LDM 5 1 361 S5 OP8 002 610 SPR C PULLEY 1 362 S5 OA2 000 650 ARM IDLER ASSY 1 363 S5 OP8 002 700 SPR LEVER TENSION 1 364 S5 OA2 000 640 CLUTCH GEAR T ASSY 1 365 S5 OA2 000 630...

Page 9: ...AIWA VX T1480 Chroma Diagram...

Page 10: ...AIWA VX T1480 CRT Diagram...

Page 11: ...AIWA VX T1480 Deflection Diagram...

Page 12: ...AIWA VX T1480 Microcontroller Diagram...

Page 13: ...AIWA VX T1480 Head Amp Diagram...

Page 14: ...AIWA VX T1480 IF PCB Diagram...

Page 15: ...AIWA VX T1480 Operations Diagram 1...

Page 16: ...AIWA VX T1480 Operations Diagram 2 Audio Amp Diagram...

Page 17: ...AIWA VX T1480 Power Diagram TV...

Page 18: ...AIWA VX T1480 Power Diagram VCR...

Page 19: ...AIWA VX T1480 Teletext Diagram...

Page 20: ...AIWA VX T1480 Y C Diagram...

Page 21: ...AIWA VX T1480 Tuner Audio Diagram...

Page 22: ...AIWA VX T1480 Waveforms...

Page 23: ...AIWA VX T1480 Wiring Diagram...

Page 24: ...AIWA VX T1480 System Control Servo Diagram...

Page 25: ...IC502 DC7 7V Does RY501 work Check P CON 5V line Check IC502 D511 and D512 Check IC502 Check pins 62 and 63 of IC101 and peripheral circuit Check IC506 Q507 and the peripheral circuit Check Q504 RY50...

Page 26: ...RN ON 2 Is CP810 inserted Is the voltage at C507 about 160V Insert CD810 Check the circuit between F501 C507 and R501 Check IC501 and the peripheral circuit Yes Yes Yes Yes No No No No Replace F501 Re...

Page 27: ...peripheral circuit Check Q353 and peripheral circuit Is the voltage at pin 29 of IC601 changed from DC10 8V to DC9 9V when pressing VOLUME UP or DOWN key Yes Yes Is the voltage at pin 1 corrector of...

Page 28: ...V line Adjust Brightness and Contrast Is the voltage at pin 17 of IC601 DC9V Is the voltage at pin 41 of IC601 DC5V Is the voltage at pin 8 38 of IC601 DC5V Is the signal at pin 12 13 and 14 of IC601...

Page 29: ...put Is the waveform 12 13 and 14 of IC601 normal Is the waveform at pin 42 of IC601 normal Is the waveform at pin 40 of IC601 normal Is the color signal received Is the color set to minimum NO COLOR R...

Page 30: ...it of IC601 Check peripheral circuit of IC101 Check R452 and FB401 Is the normal signal at pin 4 of IC 401 input Is the normal signal at pin 38 of IC101 output Is the voltage at pin 6 of IC402 DC25V C...

Page 31: ...heck TAPE LOADIG LOADING BELT MODE SWITCH DD MOTOR and CYLINDER MOTOR Does it Power off in about 3 seconds Yes No Check REEL SENSOR and REEL BELT Does it Power off in about 6 seconds Yes No Check REEL...

Page 32: ...Replace CYLINDER MOTOR Check R1059 R1080 and R1058 Replace IC1001 No Yes Yes No No Yes Is the voltage at pin 6 of CP1002 about DC13V In playback is the voltage at pin 3 of CP1002 about DC1 2V In play...

Page 33: ...o Yes Is AUDIO HEAD scratched Does pin 15 of IC1001 output a 3 0Vp p square wave 3 0V Check AUDIO BLOCK In playback is the voltage at pin 17 of CP1002 about DC1 6V In playback is the voltage at pin 14...

Page 34: ...MOTOR When a cassette is inserted is the voltage at pin 49 of IC1001 5V When a cassette is inserted is the voltage between pins 1 and 2 of CP1002 When cassette is not inserted is EOT BOT PULSE at EMMI...

Page 35: ...FRONT LOADING GEARS Defective CASSETTE or FRONT LOADING UNIT In another cassette tape does the same problem appear In covering the infrared sensor is pin 2 and 3 of IC1001 5V When inserting cassette i...

Page 36: ...of CP1002 and peripheal circuit Check pin 45 of IC1001 lines change IC1001 Check DECK MECHANISM Is the voltage changing at pin 14 of CP1002 Is the voltage changing at pin 12 of CP1002 when you press...

Page 37: ...k R1059 R1080 R1058 and D1003 No Yes Does PG PULSE signal appear at pin 13 of IC1001 No No No Yes Is the voltage at pin 6 of CP1002 UNREG 12V Does DC5V PULSE signal appear at pin 44 of IC1001 Is the v...

Page 38: ...age at pin 3 of CP1002 1 2V In playback is the voltage at pin 3 of CP1002 about 1 2V When sloeing CYLINDER is the voltage 3 8V No Yes Replace CYLINDER MOTOR Replace IC1001 No No Yes Yes 5V Is FG Pulse...

Page 39: ...k IC4101 and CYLINDER UNIT Check CONTROL HEAD No Yes By manual tracking does the DC level at pin 6 of CP4001 change In auto tracking is the voltage at pin 5 of IC1001 more than DC1 85V No No Does the...

Page 40: ...ROTATING No Yes Replace CAPSTAN BELT No Check REEL SENSOR and that the voltage at pin 10 of CX1003 is DC5V No Does CAPSTAN DD MOTOR rotate Is CAPSTAN BELT OK Yes Does REEL SENSOR PULSE signal appear...

Page 41: ...No Adjust GUIDE POST height Adjust PG SHIFTER No Does tracking noise appear in the picture Yes Yes Are GUIDE POSTS the right height No Check PB Y circuit Is PG SHIFTER Adjustment 6 5H Yes By adjustin...

Page 42: ...Yes Is the voltage at pins 12 28 and 54 of IC4001 5V No Yes Check IC4002 and the peripheral cicuit No Replace IC4001 Replace IC4001 No No Yes Is there Y signal at pin 27 of IC4001 and there CHROMA si...

Page 43: ...7 and the peripheral circuit Replace IC4002 Does FM ENVELOPE appear at TP4002 Does CHROMA signal appear at pin 27 of IC4001 Does COMPOSITE signal appear at pin 16 of IC4002 Does COLOR BURST signal app...

Page 44: ...p p Is there FM signal at pin 11 of IC4001 140mVp p No Yes Replace IC4001 No Replace IC4002 No Yes Is VIDEO waveform at pin 6 of IC4001 over 500mVp p and are there any noise Yes Yes Check J4501 Is VID...

Page 45: ...in 29 of IC4001 No No No No Replace IC4101 Check IC4101 and peripheral circuit Replace J4501 Check VIDEO input circuit Does VCR signal appear at pin 53 of IC4002 Does FM signal appear at pin 8 of CP40...

Page 46: ...igh No No Does AUDIO signal appear at pin 7 of IC5001 Check AUDIO HEAD for debris of stains Check that the connector from AUDIO HEAD is fully inserted to CP4106 Replace IC 5001 If the pin 52 of IC1001...

Page 47: ...15 of CP1002 5V In playback is the voltage at pin 14 of CP1002 2 5V Replace IC1001 Does DD MOTOR rotate now If not replace DD MOTOR Check pins between 45 and 47 of IC1001 and peripheral circuit Replac...

Page 48: ...cuit Is there AUDIO signal at pin 14 of IC5001 Check the lead wire and connector to A C HEAD Check the circuit between audio out of Tuner and pin 10 of IC5001 No No Yes Yes No No No Yes Yes Yes Is the...

Page 49: ...ETTE IN AND DOWN UNIT HAS NO FUNCTIONS No Yes Yes No Check Operation PCB Does VCR operate with the remote control Check IC1001 Check LOADING MOTOR MODE SWITCH and the peripheral parts Does mode indica...

Page 50: ...CYLINDER UNIT and IC4101 circuit No No Check the circuit from VIDEO input jack to IC4001 from Tuner Pack to IC4001 Check the peripheral circuit of Q4007 Q4009 Replace IC4001 Replace IC4101 RECORDING...

Page 51: ...uit Replace IC6001 and check peripheral circuits Check 9V and 5V line Check Q6002 Is there VIDEO signal at pin 20 of IC6001 Is defect present when replacing the IF PCB Is the voltage at pin 6 of TU600...

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