Parts/Service for VM4509

Parts/Service for VM4509

Brand: SANYO

Category: Video

Document Type: Parts/Service

Language: EN

Uploaded: Nov. 21, 2025, 6:03 p.m.

Manual Publish Date: 1982-09-06

Key Controls:

  • Contrast: Adjusts picture contrast.
  • Brightness: Adjusts picture brightness.
  • Vertical Hold: Stabilizes the vertical picture position.
  • Horizontal Hold: Stabilizes the horizontal picture position.
  • DC Restoration Switch: Adjusts DC restoration for picture clarity.
  • Display Select Switch: Selects display modes.

Connections:
  • Video In: For external video signal input.
  • Video Out: For outputting the video signal.
  • DC Input Connector: For external DC power.
  • 75 Ohm/High Switch: Selects input impedance.

Basic Adjustment Steps:
  1. Picture Focus: Adjust VR602 for best focus.
  2. Picture Width: Adjust links J605 and J606 if picture is too wide.
  3. Deflection Yoke and Centering: Loosen yoke clamp, rotate for straight raster, and adjust centering rings.
  4. Vertical Height and Linearity: Adjust V-Hold, Height, and V-Linearity controls.

Troubleshooting and error codes

Symptom Possible Cause Remedy
No Picture Power cord loose or disconnected. Check power cord connection.
Fuse F701 or F702 blown. Replace fuse.
No input signal. Check input signal source and cable.
Distorted Picture Incorrect contrast/brightness settings. Adjust contrast and brightness controls.
Vertical or horizontal hold incorrect. Adjust Vertical/Horizontal Hold controls.
Deflection yoke misaligned. Adjust deflection yoke position.
Picture Rolling Vertically Vertical Hold control misadjusted. Adjust Vertical Hold control.
Picture Rolling Horizontally Horizontal Hold control misadjusted. Adjust Horizontal Hold control.
Poor Focus Focus control misadjusted. Adjust focus-VR (VR602).
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