Vfd Display Problem - Sam4s ER-420 Service Manual

8-3 VFD Display Problem

VFD Problem
Power VDISP,
VCC Ok?
Disconnect
Ok?
Control Signal
Ok?
VFD PBA
Assy Ok?
End
SAM4S ER-420M/F SERIES
N
Y
N
Y
N
Y
N
Y
1. Refer to the Power Problem.
2. Check the Harness.
1. Check the Harness.
2. Check the VFD Disconnection Signal Pattern.
1. Check the CLK Signal (CPU P9.5) (Approx. 1MHz)
2. Check the DATA Signal (CPU P9.6)
3. Check the LATCH Signal (CPU P9.7)
4. Check the Harness.
1. Check and Replace the VFD PBA.
2. Check the HV5812P.
3. Check the VFD.
4. Check the Harness & Soldering Point.
8 Troubleshooting
8-3