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
