Parts/Service for CT-2027BM

Parts/Service for CT-2027BM

Brand: Mitsubishi

Category: TV

Document Type: Parts/Service

Language: EN

Uploaded: Nov. 21, 2025, 6:42 p.m.

Manual Publish Date: 1983-10-01

Key Features and Operation:

  • Reception System: CCIR-I PAL, UHF channels 21-68 with 16 channel preset.
  • Audio Output: 2.5W with a 4" (10cm) round speaker.
  • Picture Tube: 20" round type with 90° deflection, featuring pin cushion distortion free and quick heating.
  • Controls: Includes channel selection, volume, mute, power on/off, sharpness, channel presets, tuning, fine tuning, picture adjustment, and tone/treble controls. Features an earphone jack and a recording socket.
  • Special Features: 90° in-line high-fidelity picture tube, voltage synthesizer tuning, 24-function remote control, 1-chip video/chroma IC, SAW filter for VIF circuit, IC power regulator, and optional video/audio input/output for VCR.

Troubleshooting and error codes

Symptom/Problem Possible Cause Remedy
No Picture / No Sound Power cord not connected. Check power cord connection.
No Picture / No Sound Mains switch OFF. Turn Mains On-Off to ON.
Picture Poor Quality (e.g., distorted, wrong colors) Antenna connection loose or faulty. Check aerial input connection.
Picture Poor Quality Incorrect channel selection or tuning. Use channel selector or fine tuning.
Picture Poor Quality Incorrect Picture/Sharpness/Black Level settings. Adjust Picture, Sharpness, and Black Level controls to desired settings (refer to Service Adjustments).
No Colour Colour control set to minimum. Adjust Colour control.
No Colour Sub-Colour or Level Adj. settings incorrect. Refer to Chroma Circuits adjustment procedure.
Horizontal Sync. Difficulty Horizontal Frequency or Centring incorrect. Adjust VR502 (Horizontal Freq. Control) or S501 (Horizontal Centring).
Horizontal Size Too Small Horizontal Width jumper setting incorrect. Clip off jumper 'b' (and 'c' if necessary) on PCB-MAIN.
Poor Focus Focus adjustment incorrect. Adjust VR591A (Focus) for optimum focus.
Convergence Issues Purity, static, or periphery convergence incorrect. Follow Purity and Convergence adjustment procedures carefully.
Grey Scale Issues Picture tube or PCB-CRT replacement. Perform Grey Scale adjustment procedure.
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