Sam4s ER-390 SERIES Service Manual page 47

8-3 VFD Display Problem
VFD Problem
Power VDISP,
VCC Ok?
Y
Disconnect
Ok?
Y
Control Signal
Ok?
Y
VFD PBA
Assy Ok?
Y
End
SAM4S ER-390 SERIES
1. Refer to the Power Problem.
N
2. Check the Harness.
1. Check the Harness.
N
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)
N
3. Check the LATCH Signal (CPU P9.7)
4. Check the Harness.
1. Check and Replace the VFD PBA.
N
2. Check the UCL5812.
3. Check the VFD.
4. Check the Harness & Soldering Point.
8 Troubleshooting
8-3