Hi Bert
Thanks for your concern and suggestion.
But it operates normally with external power supply (in my case I used 38v
dc across tp950 and tp940).
Saroj
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On Sat, Jul 4, 2020, 1:28 AM Bert Haskins <bhaskins@...> wrote:
On 7/2/2020 8:51 PM, Saroj Pradhan wrote:
Hi Leo
No worry. It happens.
Sure I will check the component.
I confirmed that the scope is still working with external supply.
But before going further I want share with you my experience during the
testing of scope with limiter bulb.
1. That day you suggested to put on the scope without limiter bulb. And
you know the outcome.
2.It seems that even with shorted q9070
I could hear the same high pitch(with limiter bulb lighting)
3 changed q9070 and put on the scope(with limiter bulb). This time I had
flashing light and there was power led at front panel also flashing. And I
could hear the pitch at the same frequency as of bulb or led flashing.
Put off the scope. Again put on the scope with same result. Third time
when I put on the scope q9070 damaged again. Any logic behind this?
Thanks.
Saroj
First, let me say that I have several 223x family scopes and had very
few problems with them.
I did have a 2215A that uses a similar power supply that gave me fits
until I finally figured out that the high voltage transformer had
shorted windings.
I proved this to myself by doing a ringing test after removing the
transformer.
Good luck,
Bert
