Difference between revisions of "502/Repairs"

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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 07:51, 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