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Tek 577/177 Repair Question(s)

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mdstew1

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In process of repairing Tek 577/177 with D1 (Storage).

Unite powers up, but no trace (dot) visible, but Storage illuminates, when buttons depresssed.

I've sampled tested main board and Power Amp board, with Tek 2465 O-Scope and 7CT Curve tracer plugin on 7934 O-Scope (Transistors, diodes and some caps).

Haven't found any significant issues.

Is there some common fault which causes the Dot Trace not to appear at power on ?

Thanks in advance.
 

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