5-2 Trouble shooting Chart
No display on VFD, and buttons do not work Check the power board
No display on VFD, and
buttons do not work
Check every supply voltage
on main board is normal 5V,.
Check the main board, turn to item “No
display on VFD, and buttons do not
work”
Go
Yes
No
Check whether voltage of
CE501 is multiply 1.4 by
r.m.s voltage of AC input.
No
Check F501, RV501, BD501
Yes
Check whether voltage of
CE504 is between 10V and
18V
Check T501, D505, ZD504 ZD503,
D512 ,R508,JP505
Or replace the power board.
No
Check D509, D510, R520, R511,
R512, C504, CE509, CE510, JP511 or
replace the power board
Yes
Check Q501 Q502 R522 R504 R509
CE505 U501
Or replace the power board.
Check whether voltage of
CE505 is between 5.8V and
6.2V
Yes
No
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