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Oscilloscope VP-5403A ( National )

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

• Vertical ( with VP-0503A plug in unit ) : 25MHz BW with delay line , 5V/div to 2mV/div.
• Horizontal ( with VP-0503H plug in unit ) : 5s/div to 100ns/div with delayed sweep.
• 510,000 yen in 1973.
• 20,000 yen in 1992 at a junk shop ; "Super Video" in Osaka.

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.