Sam4s ER-260 SERIES Service Manual page 33

5-3 VFD & LCD Display Problem
VFD Problem
Power VDISP,
VCC Ok?
Disconnect
Control Signal
VFD PBA
Assy Ok?
LCD Problem
Back Light
LCD Diaplay
SAM4S ER-260 SERIES
N
Y
N
Ok?
Y
N
Ok?
Y
N
Y
End
N
OK?
Y
N
OK?
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 P0.3)
2. Check the DATA Signal (CPU P0.1)
3. Check the LATCH Signal (CPU P0.2)
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.
1. Check the PFAIL signal.
It controls LCD back light ON/OFF.
2. Check the regulator AME8807(U28) and related Circuit.
3. Check the LCD harness and soldering status.
1. Check the LCD EN, LCD RS Signal.
2. Check the buffer 74HCT574(U25) and related Circuit.
3. Check the LCD harness and soldering status.
5. Troubleshooting
5-3