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Oscilloscope VP-5403A ( National )

[Outline] [Inside view] [Plug in units] [Trouble shoots]
[Inability to control intensity] [Disappearing of the trace]

Fig.1 Z axis schematic from the old memorandum.	Fig.2 Disconnection of  Q303 corrector was cause of the inability to control  the intensity.

Fig.3 Z axis amplifier unit ( right side ).	Fig.4 After re-soldering of the lead wire of  Q303 corrector.