Aiwa TV-CN143 Service Manual
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Aiwa TV-CN143 Service Manual

Aiwa TV-CN143 Service Manual

Color television
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TV-CN143
NH

SERVICE MANUAL

COLOR TELEVISION
• This Service Manual contains the additional information "NOTICES BEFORE
REPAIRING", "DISASSEMBLY INSTRUCTIONS" and "ADJUSTMENT" for the
model TV-CN143 (NH).
If requiring the other information, see Service Manual of TV-CN143 (NH),
(S/M Code No. 09-99B-415-9R1).
S/M Code No. 09-003-415-9S1

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Summary of Contents for Aiwa TV-CN143

  • Page 1: Service Manual

    COLOR TELEVISION • This Service Manual contains the additional information “NOTICES BEFORE REPAIRING”, “DISASSEMBLY INSTRUCTIONS” and “ADJUSTMENT” for the model TV-CN143 (NH). If requiring the other information, see Service Manual of TV-CN143 (NH), (S/M Code No. 09-99B-415-9R1). S/M Code No. 09-003-415-9S1...

  • Page 2: Notices Before Repairing

    NOTICES BEFORE REPAIRING To make the best use of this equipment, make sure to obey the following items when repairing (or mending). 1. Do not damage or melt the tunicate of the leading Insulation resistance: 7.0 to 9.5 MΩ (500 V/s) wire on the AC1 side, including the power supply Voltage-withstand: 3.6 kV for 3 or more seconds cord.

  • Page 3: Rear Cabinet Removal

    DISASSEMBLY INSTRUCTIONS 1. REAR CABINET REMOVAL (1) Remove four screws 1 and three screws 2 , then remove the rear cabinet in the direction of the arrow. Front cabinet (See Figure1-1) Rear cabinet Figure 1-1 2. HIGH-VOLTAGE CAP (ANODE CAP) REMOVAL 2-1.
  • Page 4 (5) Push the anode cap with your thumb in the direction of arrow 1 as shown in the figure, then lift the cap in the direction of arrow 2 to release the hook on one side. (See Figure 2-3) Anode cap Hook Hook Figure 2-3...
  • Page 5 (3) Eliminate twisting, etc. of the high-voltage cable and arrange it so that no twisting occurs. (See Figure 3-3) High-voltage cable Anode cap Caution : If the cable is not arranged correctly, the anode cap could turn and cause an installation defect. Figure 3-3 (4) Turn over the rubber cap symmetrically on the left and right.
  • Page 6 (6) Apply the hook on one side to the anode button as shown on the figure. (See Figure 3-6) Caution : Check that the hook is held securely. (7) Apply the hook on the other side to the anode button as shown in Figure 3-7.
  • Page 7 4. NK C.B. (PWB, NK) REMOVAL (1) Disconnect CN903 (CRT GND). Front cabinet (2) Disconnect CN901, CN902 (3) Remove the NK C.B. in the direction of arrow 1. (See Figure 4-1) CN801 (Power Cord) 5. MAIN C.B (PWB, MAIN) REMOVAL CN802 (1) Remove connector (CN401).

  • Page 8: Set-Up For Adjustment

    ADJUSTMENT SET-UP FOR ADJUSTMENT 1. CRT ADJUSTMENT Because the video signal output from a pattern generator is used as 1-1. Precautions the adjustment signal input during adjustment, the video signal (1) Receive the white raster signal, and then perform aging for at output from the pattern generator must conform with the least 20 minutes.
  • Page 9 (2) Beam convergence adjustment (4-pole magnet) (3) Beam convergence adjustment (6-pole magnet) With a 4-pole magnet align the G beam with the already aligned Align the R beam with the B beam. The G beam does not R/B beam. move with this adjustment. (magenta) (magenta) (white)
  • Page 10 1-3. Beam Landing Adjustment (1) Receive the green raster signal from the pattern generator. As there is occurrence of convergence distortion after (2) Loosen the magnet lock screw, and shift the magnet assembly completing the landing adjustments, be sure to carry out backward (toward the neck).
  • Page 11 1-4. Beam Center Convergence Adjustment 1-5. The Surrounding Convergence Adjustment Perform this adjustment after completion of adjustment 1-4. Make adjustments on the convergence with 4-pole and 6-pole magnets. Operate each magnet in relation to the electron beam as (1) Shake the deflecting yoke up, down to the right and left, and shown in Figs.

  • Page 12: Electrical Adjustment

    2. ELECTRICAL ADJUSTMENT J402 TP101 (RF AGC) TU101 T601 (FBT) R101 C213 TP102 (IF) TP203 L205 (DE EMPHASIS) L201 R211 TP202 (LIMIT) C332 IC301 TP201 (AFT) BT301 T601 (FBT) FOCUS TP302 SCREEN IC303 IC402 J403 J401 R903 R902 TP902 S901...
  • Page 13 • Operate after inputting the following initial figures when replacing EEP ROM. • Check the condition and adjust the area where the general repair is carried out. TV-CN143 PAGE 1 1-1. H POS Horizontal Positioning / Adjustment Menu Screen : PAGE 1-1...
  • Page 14 1-4. OSD POS OSD Positioning / Adjustment Menu Screen : PAGE 1-4 Input signal : Not specified • Adjust + mark positions on both left and right in the equal distance towards the screen edge. A = B (Fig. 1-4) 1-5.

  • Page 15: Cut Off Adjustment

    Cut Off Adjustment 2-1. Use the pattern generator to input the white raster signal. 2-2. Using the volume keys on the jig remote controller, fix the figure of the brightest color on the screen to the level 127 and adjust the other 2 cut off figures until a white picture appears on the screen.
  • Page 16 3-2. SUB CONTRAST Sub-contrast Adjustment / Adjustment Menu Screen : PAGE3-1 Input signal : Color bar (QIW) Chroma / Off Measuring instrument : Oscilloscope pattern generator Test point : TP902/NK C.B. 1. Connect oscilloscope to TP902. 2. Using the volume keys on the jig remote controller, adjust the voltage between pedestal level and 100% white to 80V±...

  • Page 17: Tuner Adjustment

    Tuner Adjustment: Perform the following adjustment in case of replacing any adjustment element during the repair. Proceed with the following adjustments as well as in the adjustment menu screen. If those adjustments are not completed on both sides, the required adjustment will not be registered even thought the adjustment has been processed in the adjustment menu screen.

  • Page 18: Starting The Service Mode

    SETTING OF IIC BUS DATA This model is designed to adjust most parts of the image projection and deflection system by using the jig remote controller. Preparations: • Modify the hidden keys on the RC-6VT06 jig remote controller (TV-C142/86-LB4-951-010) so that they can easily be pressed. 2 keys to be modified.
  • Page 19 3. Display of “CRT ON” accumulated hours The CRT usage time is accumulated on an hourly basis and is indicated in hexadecimal figures. Sample calculation of displayed hexadecimal figures : AFT OK 1234 H MONO * The display will be reset to 0000H when the accumulated hours exceed 7FFFH (32768 hours) Adjustment Mode Operation Method: Return to the aging display by pressing the “SYSTEM”...
  • Page 20 2–11, IKENOHATA 1–CHOME, TAITO-KU, TOKYO 110, JAPAN TEL:03 (3827) 3111 9820572 0251431 Printed in Singapore...

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