502/Repairs: Difference between revisions

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(Created page with "__TOC__ ==Supply out of regulation== :'''Symptom:''' +350 V supply out of regulation (~300 V) :'''Root cause:''' C751 10 nF "Bumble Bee" leaky :'...")
 
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:'''Root cause:''' C751 [[Bumble Bee capacitors|10 nF "Bumble Bee"]] leaky  
:'''Root cause:''' C751 [[Bumble Bee capacitors|10 nF "Bumble Bee"]] leaky  
:'''Solution:''' Replace C751
:'''Solution:''' Replace C751
==HV very low==
:'''Symptom:''' HV very low, oscillator tube V800 gets very hot
:'''Root cause:''' [[Bumble Bee capacitors|Black Beauty capacitors]] in HV circuit leaky
:'''Solution:''' Replace all 6.8 nF HV caps
==No sweep at slower speeds==
:'''Symptom:''' In 1 ms/Div and slower, no sweep − trace stationary on left
:'''Root cause:''' [[Bumble Bee capacitors]] in holdoff circuit leaky
:'''Solution:''' Replace C180B-D




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

Revision as of 08:51, 8 November 2019

Supply out of regulation

Symptom: +350 V supply out of regulation (~300 V)
Root cause: C751 10 nF "Bumble Bee" leaky
Solution: Replace C751

HV very low

Symptom: HV very low, oscillator tube V800 gets very hot
Root cause: Black Beauty capacitors in HV circuit leaky
Solution: Replace all 6.8 nF HV caps

No sweep at slower speeds

Symptom: In 1 ms/Div and slower, no sweep − trace stationary on left
Root cause: Bumble Bee capacitors in holdoff circuit leaky
Solution: Replace C180B-D