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VFD No display on Front Control Board
VFD No display on
Front Control Board
Go
Check every supply voltage on Main Board
whether normal or not.
(XP1 PIN1:-24V, PIN3: 12V, PIN5&PIN6:
Yes
Check voltage -24V, +5V, +12V on Power
Board at CN502 position and Front Control
Board
(HTS3531:XP2
PIN5:+12V PIN6:+3.3V)
Yes
Check the power key(HTS3531: S608),
open/closed key(HTS3531: K138), source
key(HTS3531: K135) on Touch Board
whether work normally or not
Yes
Check
Front
SCL,SDA
(HTS3531:XP2 PIN8: SCL PIN7:SDA)
Yes
Check whether bad solder exists on
HTS3531:XP8 on Front Control Board and
VFD135 of VFD,
Yes
Replace U135 or VFD
5V)
PIN4:-24V
Control
Board
signals
5-1
No
Refer to CN502 on Power Board
No
Fix the connection HTS3531:XP2 on
Front Control Board
Main Board
No
Replace U1 on Main Board, or replace
the Main Board
No
HTS3531:Check the U135 ON Front
Control Board pin 7 8 arrive the condition
XP8 PIN7 PIN8
No
Correct connection
Trouble shooting Chart
and
XP12 on
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