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Akai CFT2716 Service Manual

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SERVICE MANUAL
Model:
Safety Instructions
Features & Specifications
Block Diagram
Circuit Diagram
Disassembly
Pin Descriptions
Exploded View Diagram
Spare Part List
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.
CFT2716

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Summary of Contents for Akai CFT2716

  • Page 1 SERVICE MANUAL Model: CFT2716 Safety Instructions Features & Specifications Block Diagram Circuit Diagram Disassembly Pin Descriptions Exploded View Diagram Spare Part List This manual is the latest at the time of printing, and does not include the modification which may be made after the printing,...

  • Page 2: Important Service Safety Information

    IMPORTANT SERVICE SAFETY INFORMATION Operating the receiver outside of its cabinet or with its back removed involves a shock hazard. Work on these models should only be performed by those who are thoroughly familiar with precautions necessary when working on high voltage equipment. Exercise care when servicing this chassis with power applied.
  • Page 3 3. To be sure that not shock hazard exists, a check for the presence of leakage current should be made at each exposed metal part having a return path to the chassis (antenna, cabinet metal, screw heads knobs and/or shafts, escutcheon, etc.) in the following manner. Plug the AC line cord directly into a 120V, AC receptacle.

  • Page 4: Function And Specification

    FUNCTION AND SPECIFICATION TUBE/POWER SUPPLY TUBE TYPE SIZE 27'' ASPECT RATIO 4∶3 POWER SUPPLY ~120V，60Hz SOFT MAIN POWER SWITCH SWITCH TUNER BUILT-IN FS TUNER # OF CHANNEL/PROGRAM 181 CH COLOR SYSTEM NTSC SOUND SYSTEM AV NTSC 3.58/4.43 AV NTSC 3.58 PICTURE COMB FILTER 2LINE...
  • Page 5 Block diagram V OUT H OUT TDA8177F TUNER terminal AUDIO R/L1 R/L2 R/LO MTS/SAP AUDIO PRO AUDIO POWER NTSC M/N TDA9859 TDA2616 TDA9850 TDA9378 TRAP COMB FILER VEDIO SWITCH TC4052 TDA9183 VO V1 V2 Y/C terminal VEDIO 5V -12V 12V 18V 45V 135V TDA16846...
  • Page 11 Philips Semiconductors Preliminary specification TDA9850 C-bus controlled BTSC stereo/SAP decoder PINNING SYMBOL DESCRIPTION variable emphasis output for dbx variable emphasis input for dbx capacitor noise reduction for dbx capacitor mute for SAP capacitor DC-decoupling for SAP fpage AGND analog ground DGND digital ground serial data input/output...

  • Page 15: Power Supply

    Service Flow Chart Power supply Check input voltage Check voltage 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: Cpu Circuit

    CPU circuit Check voltage of N103 pin54,pin56,pin61(3.3V) Check waveform of N103 pin58,pin59 Check waveform of N103 pin2,pin3 Check 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)
  • Page 17 Horizontal circuit Check voltage 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: Video Circuit

    Video circuit Check voltage of C109+(33V) Check voltage of C106+(5V) Check waveform of tuner pin4,pin5 Check waveform of tuner 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...

  • Page 19: Audio Circuit

    Audio circuit Check waveform of N103 pin28 Check waveform of N103 pin44 Check waveform of N201 pin11 Check voltage of N201 pin10(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...

  • Page 20: Test Equipment

    TEST EQUIPMENT 1. Standard Signal Generator (PT5820) 2. Oscilloscope 3. Digital Voltmeter 4. High Voltage Meter(40KV) 5. Demagnetizing Coil Tip: some adjustments must be performed in the SERVICE menu. You can enter the SERVICE menu in the following way: 1. Press the MENU button on the remote control then press the INFO button on the remote control at least 5 times immediately.

  • Page 21: White Balance Adjustment

    6EWW: Horizontal Width Set the correct picture width. 6EWP: East-west parabola correction Set the vertical lines at the sides of the screen straight. 6UCR: East-west corner-correction Set the vertical lines in the upper corners straight. 6LCR: East-west corner-correction Set the vertical lines in the lower corners straight. 6EWT: Trapezium correction Set the vertical lines as vertical as possible.

  • Page 22: Osd Adjustment

    OSD ADJUSTMENT 1.Receive the TV Signal with caption text. 2.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)
  • Page 24 Spare Part List CFT2716 Spare Part List Item Component Description/Country Origin Unit Qty 1. CRT, CRT Socket, D.G coil, DG thermistor, Relay 31002362 CRT-A68QCU770X590MGF-01-LG/U 25000962 CRT SOCKET GZS10-2-AC3-14~17KV/A/M 12000414 DEGAUSSING COIL KK74B-75T7D0.50-3050/U 13005053 DEGAUSSING THERMISTOR T705-B60-A110-4R5M 230V-EPCOS/# PCS 34002023 RELAY G5PA-1-OMRON 2.
  • Page 25 6. Power Cord, Fuse 27000130 POWER SUPPLY CORD SP-12OP-D10A125V2.3MK220/U、C 27000148 FUSE RT1-20-4A-L125V/# K 7. Remote Controller , IR Receiver 1 KK-Y261N REMOTE HANDSET KK-Y261N FOR AKAI 21000311 IR REMOTE CONTROL RECEIVER 8. Tuner / Saw Filter 32000959 TUNER TDQ-BFSNS2/2 20000762 *SAW FILTER M1967-NIANYAN 9.
  • Page 26 Spare Part List 39015656 CARTON BOX 510*CFT271610/01-AKAI 12. Instruction Manual 39015657 MANUAL 570*CFT2716/01-AKAI 13. Other key parts 1 KP2708UYSKD-00 KP2708UY SKD CHASSIS ASSEMBLY 2 KP2708UYCRT-00 KP2708UY CRT BOARD ASS'Y 3 KP2708UYSYCLB-00 KP2708UY SOUND PROCESS BOARD ASS'Y 4 KP2708UYAJB-00 KP2708UY KEY RECEIVING BOARD ASS'Y...
  • Page 27 25000187 THREE HOLE AV SOCKET WK3-8.4-13 25000924 SIX HOLE AV SOCKET AV6-8.4-1 25001622 SOCKET ZAV-534V-01 36014984 AC LINE CORE CLIP 254*000210/00-F 36015337 BRACKET 229*ST296810/100C 36018318 SPEAKER BRACKET229*P3411T10/101 36019002 BRACKET 229*T292610/100C 36027854 MODEL PLATE 412*CFT271610/01-AKAI 36027895 PLATE384*CFT271610/01-AKAI 37008152 NAME PLATE 401*CFT271610/01-AKAI...

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