Kenwood DPX-500 circuit

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Hi  fellow techies, anyone got a circuit for the Kenwood DPX-500 car
audio player. I have having trouble getting the VFD display to light
up. The VFD power supply delivers +48v DC and 5vAC to the filaments
but no display. Filaments measure around 2.2 ohms. Multiplex pulses at
the anodes and grids............any clues anyone? Cheers, Renfred.
Remove (X) from xrenfred for correct email address...thanks.

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