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Back to Measurement Equipments 2

Oscilloscope VP-5520C ( National )

[Outline] [Inside view] [Restoration]
[Replace the shorted AC line cable.] [Attach  the air filter.] [Adjustment of the Main A-Sweep rate.] 
[Replace the light bulbs for scale illumination.] [Replace a BNC receptacle of CH2 input ]

Fig1. Two of three light bulbs ( d=4mm/18V ) were broken.	Fig.2 The stocked bulb is too small and the specific voltage is too low (  d=3mm/12V ).

Fig.3 The left  bulb sold as a junk( d=4mm/15V ) is same size of  the original bulb.	Fig.4 Replace bulbs.