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