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Oscilloscope VP-5403A ( National )


[Outline] [Inside view] [Plug in units] [Trouble shoots]


Fig.1 Front view
[Features]
[Trouble Shoots]

Troubles Cause Repair ( August 10 , 1992 )
Inability to control intensity. A lead wire of a transistor on z axis amplifier board was disconnected.  Re-soldering the lead wire.
Sometimes all of the trace was disappeared. A poor contact of a 35V zener diode for the 75V AVR. Replace the zener diode.