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Magnum CTV-2120 TXT Service Manual

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SERVICE MANUAL
TV SET
MODEL:
CTV-2120 TXT

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Summary of Contents for Magnum CTV-2120 TXT

  • Page 1 SERVICE MANUAL TV SET MODEL: CTV-2120 TXT...
  • Page 2 SAFETY INSTRUCTIONS WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY RADIATION PRECAUTION", "SAFETY PRECAUTION" AND "PRODUCT SAFETY NOTICE" DESCRIBED BELOW. X-RAY RADIATION PRECAUTION 1. Extremely high voltage of the picture tube may result in producing potentially hazardous X-RAY RADIATION. To avoid such hazards, the high voltage must not be above the specified limit.

  • Page 3: Safety Precaution

    S D A S D A S C L In this TV unit, IC801 is the main chip while IC802, IC201 and other chips are regarded as sub-chips. IC801 (CPU) controls the functions of IC201 via the I C bus between them. 2.2 The data of channel positions, BT voltage, band, AFT, clear, volume, power on/off, timer, color, etc.

  • Page 4: How To Operate Remote Control

    Remote Handset Operation Top View of Remote Control HOW TO OPERATE REMOTE CONTROL There are 27 buttons on the remote control. It operates with infra-red beam which is not affected by noise or other interferences. Make sure strong light never strikes on the infra-red receiver; otherwise, it would obstruct the remote control working normally with the TV unit.
  • Page 5 METHOD OF REMOVING BACK CABINET (see Fig. 2) Attn.: Before disassembling the back cabinet, first draw the power cord plug of the receiver from AC outlet. 1. Disconnect the antenna cable from the antenna terminal. 2. Loosen the 5 pieces of screw (A) used in fixing the antenna jack plate on the back cabinet. 3.
  • Page 6 The AC power line voltage should be accurately kept during alignment. During the process of alignment, the AC voltage should be kept in the range from 215V to 225V (50Hz). Do not attempt to connect or disconnect any wire while the receiver is in operation. Make sure the power cord is unplugged before replacing any parts in the receiver.

  • Page 7: Test Equipment

    (2) Never short-circuit the "HOT" and "COLD" circuit to prevent the fuse or other components from burning. (3) Never connect any measuring equipment such as oscilloscope to both the "HOT" and "COLD" circuit at the same time to prevent the fuse from burning. Also, connect the ground of the measuring equipment to the ground of the circuit being tested.
  • Page 8 Incorrect Waveform Correct Waveform (Fig. 5) (Fig. 6) AGC DELAY ADJUSTMENT: (1) Tune the strongest station in your area. (2) Access service mode, then selects RF AGC item adiustment setting is about = 24 in the range (00 TO 3F). (3) The snow just disappears from the screen.

  • Page 9: Vertical Adjustment

    VERTICAL ADJUSTMENT Apply a crosshatch signal. Adjust (V-S CORRECTION) to obtain a s-correction picture. Adjust (V-LINEARITY 50/60) to obtain a linear picture. Adjust (V-POSITION 50/60) to move the picture at the center. Adjust (V-SIZE 50/60) to obtain rightful high picture. ATTN.: These settings should be done with separate test signals with a 50 Hz and a 60 Hz field frequency.
  • Page 10 Loosen the clamping screw of the deflection yoke to allow the yoke to tilt. Put a wedge as shown in Fig.8 temporarily. (Do not remove the cover paper on the adhesive part of the wedge). Tilt front of the deflection yoke up or down to obtain better convergence in circumference. (See Fig.10). Push the mounted wedge into the space between the picture tube and the yoke to hold the yoke temporarily.
  • Page 11 DEFLECTION YOKE TEMPORARY RUBBER WEDGE MOUNTING PURIIY AND CONVERGENCE MAGNET ASS Y RUBBER WEDGES ADHESIVE DEF.YOKE 33 mm (1-5/16 ) RUBBER WEDGES LOCATION Figure 8 4-POLE MAGNETS ADJUST THE ANGLE FIXED (VERTICAL LINES) PURITY MAGNETS 6-POLE MAGNETS ROTATE TWO TABS AT THE SAME TIME (HORIZONTAL LINES) CONVERGE MAGNET ASSEMBLY...
  • Page 12 HOW TO ACCESS THE SERVICE MODE 1. First press the VOLUME "-" button in the TV set until the volume turn to zero. 2. Keep pressing this button, then press the "status" button on the remote contol,then you can access the service mode. Use the [MENU], [CH UP], [CH DOWN], [VOL UP] or [VOL DOWN] button to highlight the item to set ,which is displayed in red.
  • Page 13 n Press [CHANNEL UP OR DOWN] to select the highlighted item, then [VOL DOWN],or [VOL UP] to increase or decrease the setting, The data is written to EEPROM. n TB1238AN Adjustment Items Logo -----: Selects logo adjustment setting is thirteen characters. RGB Contrast: Selects RGB contrast adjustment setting is 30 in the range 00 to 3F.
  • Page 14 Option byte 0 The following options are available in option byte 0: bit 7 bit 6 bit 5 bit 4 bit3 bit 2 bit1 bit 0 NTSC Comb H-out stop Forced ID ON ABL Gain ID sensitivity ABL start point SW (N-com) (H-STP) (FID)
  • Page 15 Option byte 3 The following options are available in option byte 3: bit 7 bit 6 bit 5 bit 4 bit3 bit 2 bit1 bit 0 1238 setting WPS Blanking CW SW Market S-Video in Mute Logic Surround (white Peak SW (BLK) France process...

  • Page 16: Specifications

    Option Byte 0 adjustment setting are 3Chex. Specifications: Model Refer to the Back Plate of the TV unit Power Rating Refer to the Back Plate of the TV unit Power Consumption Refer to the Back Plate of the TV unit (at 220V 50Hz) 14”...