1A5/Repairs: Difference between revisions

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Design mistake.  The UNCAL lamp is powered by "+100V DCPLD A" which shifts the trace
Design mistake.  The UNCAL lamp is powered by "+100 V DCPLD A" which shifts the trace
about 0.1 division.  It should be powered from the basic +100V rail.
about 0.1 division.  It should be powered from the basic +100 V rail.


Serial Number B124386
Serial Number B124386


===SYMPTOM:  Vc has long asymptotic tail===
===Symptom:  Vc has long asymptotic tail===
DATE: 20220520<br/>
DATE: 20220520<br/>
NOTE: Old symptom, just noticed now<br/>
NOTE: Old symptom, just noticed now<br/>
CAUSE: Leakage in C114, 1uF 25V NP aluminum electrolytic<br/>
CAUSE: Leakage in C114, 1 μF 25 V NP aluminum electrolytic<br/>
ACTION: Replace with 1uF 25V X7R ceramic a la Type W<br/>
ACTION: Replace with 1 μF 25 V X7R ceramic a la Type W<br/>
FIXED
FIXED


===SYMPTOM:  Clear V/CM knob skirt is cracked and slipping===
===Symptom:  Clear V/CM knob skirt is cracked and slipping===
DATE:  202205<br/>
DATE:  202205<br/>
NOTE: Old symptom, just slowly getting worse<br/>
NOTE: Old symptom, just slowly getting worse<br/>
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ACTION: Redraw with Sharpie<br/>
ACTION: Redraw with Sharpie<br/>


 
===Symptom: Cannot pull out V/Div knob in 500 and 50 mv/div positions===
Reason: Variable V/div knob mounted too far towards the main knob. 




[[Category:Instrument repair reports]]
[[Category:Instrument repair reports]]