Sam4s ER-5200 - VFD Display Problem

8 Troubleshooting
SAM4S ER-5200 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 P9.5)
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 nCS Signal of Latch 74HC541 (U30)
3. Check the VFD Disconnection Signal Pattern.
N
VFD PBA
Ass
y
Ok?
Y
1. Check and Replace the VFD PBA.
2. Check the UCL5812.
3. Check the VFD.
4. Check the Harness & Soldering Point.
N
Y
N