Sam4s ER-420F - RS-232 C Serial Communication Problem

8 Troubleshooting
SAM4S ER-420M/F SERIES 8-3
8-3 VFD Display Problem
End
VFD Problem
Control Signal
Ok?
Y
N
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.
Disconnect
Ok?
Power VDISP,
VCC Ok?
Y
1. Refer to the Power Problem.
2. Check the Harness.
1. Check the Harness.
2. Check the VFD Disconnection Signal Pattern.
N
VFD PBA
Ass
y
Ok?
Y
1. Check and Replace the VFD PBA.
2. Check the HV5812P.
3. Check the VFD.
4. Check the Harness & Soldering Point.
N
Y
N