Akai PDP4294LV1 Service Manual page 82

4. Trouble shooting.
6. Z-sus B/D
1. Check the FUSE.
2. Check input voltages.(Va, 5V,15V)
3. Check FPC out put diode value.
4. Check ramp waveform.
Check input voltages
Check the FUSE
5V FUSE
Va FUSE 6.3A Vs FUSE 2A or 4A