Note: when no screen display appears, firstly make clear whether voltage of display screen is
normal, whether display drive IC is normal; VFD screen is vacuum packaged and it is easy to damage,
so in most conditions it is the screen that has been damaged.
Example 8 Symptom: power not on
Description: no action after power on, relay does not attract, no screen display.
Analysis and troubleshooting: power on, observe each fuse and it is normal, test secondary stage
voltage of transformer and it is 0, test primary stage voltage of transformer and it is normal, test primary
resistance of transformer and it is infinite, so we judge that transformer has been burnt down. Change
transformer and trouble is removed.
Note: when power not on, firstly make clear that it is power not on or has no screen display, whether
it is part of voltage is abnormal or all voltage is abnormal; if it is power not on, test stage by stage from
power socket until the trouble is found.
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Summary of Contents for AV311T
Page 1: ...service manual AV311T...
