Akai CFT2716, Service Manual

Page 1: ...Circuit Diagram Disassembly Pin Descriptions Exploded View Diagram Spare Part List Model SERVICE MANUAL This manual is the latest at the time of printing and does not include the modification which may be made after the printing by the constant improvement of product ...

Page 2: ...r their chassis type Higher voltage may also increase the possibility of failure in the HV supply It is important to maintain specified values of all components in the horizontal and high voltage circuits and anywhere else in the receive that could cause a rise in high voltage or operating supply voltages No changes should be made the original design of the receiver Components shown in the shaded ...

Page 3: ...he metal part to be checked Use a VTVM or VOM with 1000 Ohms per Volt or higher sensitivity to measure this AC voltage drop across the resistor Any reading of 0 35 volt RMS of more is excessive and indicates potential shock hazard which must be corrected before returning he receiver to the owner ALIGNMENT PROCEDURES PLEASE READ BEFORE ATTEMPTING SERVICE 1 Use an Isolation Transformer when performi...

Page 4: ...NTROL NORMAL BRIGHT USER SOFT YES USER SELECTABLE 3 STAGE COLOR TEMPERATURE CONTROLS YES OSD LANGUAGE ENG FR SPA SOUND STEREO MONO MTS SAP AV STEREO YES SURROUND YES TONE CONTROL BASS TREBLE BALANCE YES USER SELECTABLE SOUND CONTROL YES SPEAKER QUANTITY 2 AUDIO OUTPUT POWER 3W 2 USER CONVENIENCE FULL FUNCTION REMOTE CONTROL YES CCD YES V CHIP YES CHILD LOCK YES SLEEP TIMER YES RECALL YES QUICK VIE...

Page 5: ... TDA9378 AUDIO POWER TDA2616 RGB OUT H OUT V OUT TDA8177F TRAP VEDIO SWITCH TC4052 VO V1 V2 Y C VEDIO terminal COMB FILER TDA9183 CRT MTS SAP TDA9850 AUDIO terminal R L1 R L2 R LO AUDIO PRO TDA9859 SAW 5V 12V 12V 18V 45V 135V TDA16846 ...

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Page 11: ...ADJ 16 capacitor for filter adjustment CER 17 ceramic resonator CMO 18 capacitor DC decoupling mono CSS 19 capacitor DC decoupling stereo SAP CR 20 adjustment capacitor right channel OUTR 21 output right channel CSDE 22 capacitor SAP de emphasis SAP 23 SAP output Vref 24 reference voltage 0 5 VCC 1 5 V CL 25 adjustment capacitor left channel CND 26 noise detector capacitor OUTL 27 output left chan...

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Page 15: ...e of C911 12V Check voltage of C919 5V Check voltage of C155 3 3V Check RY901 turn on Check voltage of C929 135V Check voltage of C945 48V Check voltage of C939 12V Check voltage of C946 12V Check voltage of C994 9V Check voltage of C933 8V Check voltage of C930 5V ...

Page 16: ...k voltage of N602 pin8 5V Check waveform of N602 pin5 pin6 Vertical circuit Check voltage of N103 pin14 pin39 8V Check waveform of N103 pin26 Check waveform of N103 pin21 pin22 Check voltage of N401 pin3 48V Check voltage of N401 pin2 12V Check voltage of N401 pin4 12V Check waveform of N401 pin1 pin7 Check waveform of N401 pin5 ...

Page 17: ...e of N103 pin14 pin39 8V Check waveform of N103 pin33 Check voltage of C945 48V Check waveform of V401 B Check waveform of V401 C Check voltage of C929 135V Check waveform of V402 B Check waveform of V402 C Check voltage of C415 200V ...

Page 18: ...uner pin11 IF Check voltage of L103 and L104 8V Check waveform of N103 pin23 pin24 Check waveform of N103 pin38 Check waveform of N103 pin40 Check waveform of N802 pin12 pin13 Check waveform of N302 pin12 pin14 pin16 Check waveform of N103 pin42 pin43 Check waveform of N103 pin51 pin52 pin53 Check video amplify circuit ...

Page 19: ...n10 9V Check waveform of N201 pin8 pin9 Check waveform of N201 pin21 pin27 Check waveform of N801 pin3 pin5 Check voltage of N801 pin6 8V Check waveform of N801 pin16 pin17 Check waveform of N801 pin15 pin18 Check waveform of N202 pin1 pin9 Check voltage of N202 pin7 Check waveform of N202 pin4 pin6 Check waveform of speaker ...

Page 20: ...s IF ADJUSTMENT 1 Enter the SERVICE menu and press the number button 4 on the remote control to bring up SERVICE 4 2 Set the IFFS to 1 B ADJUSTMENT TEST EQUIPMENT DIGITAL METER 1 Operate the TV set with AC 120V 2 Connect the digital voltmeter lead to C929 and GND Adjust the RP901 until the meter reading DC135 0 5V GEOMETRY ADJUSMENT 1 Receive a geometry pattern 2 Enter the SERVICE menu SERVICE 1 f...

Page 21: ...al of the height 6VSH Vertical Shift Set the vertical centre of the picture at the centre of the tube WHITE BALANCE ADJUSTMENT 1 Enter the TV menu and set the color mode to NORMAL 2 Receive a black white pattern with color sync signal 3 Adjust the CONTRAST and BRIGHTNESS in such a way that the brightness value of the black area is 5 nit and the white is 80 nit 4 Enter the SERVICE 3 menu and adjust...

Page 22: ...Enter the SERVICE 2 menu 3 Select a correct value for the items below 6VOF Vertical OSD position alignment 6CCV Vertical OSD of CCD position alignment HOF Horizontal OSD position alignment CCHF Horizontal OSD of CCD position alignment VX Vertical Zoom select 25 ...

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Page 24: ...3005053 DEGAUSSING THERMISTOR T705 B60 A110 4R5M 230V EPCOS PCS 1 5 34002023 RELAY G5PA 1 OMRON PCS 1 2 All ICs excluding the voltage regulator 1 19000493 IC TDA2616 PHILIPS PCS 1 2 19000695 HS817B G VISHAY PCS 1 3 19001329 IC TDA16846 SIEMENS PCS 1 4 19001639 IC TDA9859 PHILIPS PCS 1 5 19002089 IC TDA9183 PHILLPS PCS 1 6 19002389 IC TDA9850 PHILIPS PCS 1 7 19002479 IC 24LC08B MICROCHIP PCS 1 8 19...

Page 25: ...PCS 1 13 16001676 DIODE BZX79 B C6V2 PHILIPS H PCS 1 14 16001680 DIODE BZX79 B C9V1 PHILIPS H PCS 1 5 Transformer Switching Flyback Line Drive etc 1 11001453 SWITCHING TRANSF BCK50 066 A U PCS 1 2 30001392 FLYBACK TRANSFORMER BSC28 070 A PCS 1 3 11000244 LINE DRIVE TRANSF BCT19F 04 PCS 1 6 Power Cord Fuse 1 27000130 POWER SUPPLY CORD SP 12OP D10A125V2 3MK220 U C PCS 1 2 27000148 FUSE RT1 20 4A L12...

Page 26: ...POWER FILTER LCL 246 PCS 2 7 13002004 COATING QUICK FUSED RESIS RF10D 1W0 33ΩK A PCS 1 8 13002636 GLASSGLAZE TRIMMER POTENTIOMETER WI06 2B A202L PCS 1 9 13003642 FUSED RESIS RF1S 1W0 33ΩJ KOA U PCS 1 10 13003714 NTC 5D2 14 5Ω K 270V ISHIZUK PCS 1 11 13003792 COATING QUICK FUSED RESIS RF10B 1W0 33ΩK L15 A PCS 2 12 13003891 COATING QUICK FUSED RESIS RF10D 2W2 7ΩJ L25 A PCS 1 13 13004803 NTC S237 5 0...

Page 27: ...002610 IC MC7805CT ONSEMI PCS 1 50 19002619 IC MC7808CT ONSEMI PCS 1 51 20000002 CERAMIC TRAP FILTER XT4 5MB PCS 1 52 20000274 CERAMIC RESONATOR CSB503F58 MURATA PCS 1 53 22000340 QUARTZ CRYSTAL JA120 12M 30 20PF 20Ω PCS 1 54 23000226 TOUCH SWITCH KFC A06 L4 4 5 6 5 4 3B PCS 6 55 23000481 TOUCH SWITCH KFC A07 10H070 PCS 1 56 25000150 S TERMINAL JACK TCS 56 WK PCS 1 57 25000187 THREE HOLE AV SOCKET...