vp-5520c_outline.html

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Oscilloscope VP-5520C ( National )

[Outline] [Inside view] [Restoration]

Fig1. Front view.

[Features]

Vertical : 200MHz BW (5V/div to 10mV/div)
Dual trace plus trigger input trace.
Horizontal : 0.5s/div to 20ns/div
VP-5520a data sheet (PDF format 277kB) is here

[Trouble Shoots]

Troubles Cause Repair

No AC line input. The AC line cable was shorted and opened at some points. Replaced the cable.

The shaft of CH1 variable attenuator was distorted . - Corrected the distorted shaft.

One of the feet on rear panel was distorted. - Corrected the distorted foot.

No air filter of the blower fan. - Attached an air filter.

CH2 input BNC receptacle was broken. - Replaced the receptacle.

Scale illumination was not work. - Replace light bulbs.

Main A-Sweep time base error was larger than specification. - Adjusted some potentiometers and a trimmer capacitor.

Troubles	Cause	Repair
No AC line input.	The AC line cable was shorted and opened at some points.	Replaced the cable.
The shaft of CH1 variable attenuator was distorted .	-	Corrected the distorted shaft.
One of the feet on rear panel was distorted.	-	Corrected the distorted foot.
No air filter of the blower fan.	-	Attached an air filter.
CH2 input BNC receptacle was broken.	-	Replaced the receptacle.
Scale illumination was not work.	-	Replace light bulbs.
Main A-Sweep time base error was larger than specification.	-	Adjusted some potentiometers and a trimmer capacitor.