Author Topic: HP 8153A Lightwave multimeter - does not power up  (Read 928 times)

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Offline asilva10

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HP 8153A Lightwave multimeter - does not power up
« on: October 26, 2018, 03:46:19 pm »
I have a HP8153A that does not power up. I was not able to find any schematics or service manual for this instrument.

I made quick measurements at the power-supply board (HP P/N 08153-66503) and it seems that the input stage is okay and after the rectification I have +165V (input 110Vac). But after the switching stage, no voltage level. I cannot detect any sign of "oscillator on". I believe that the driver is a component Q101, but I am not sure.

I tried to look at eBay and found a lot of these instruments with the same problem (no power). Any hint?
 

Offline Jwalling

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Re: HP 8153A Lightwave multimeter - does not power up
« Reply #1 on: October 26, 2018, 03:55:37 pm »
There's a 8 pin DIP that controls the switcher, I forget the part #. Replace it and you'll be good to go. I've fixed at least 10 of these in the past where that chip was bad.
Jay

System error. Strike any user to continue.
 

Offline asilva10

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Re: HP 8153A Lightwave multimeter - does not power up
« Reply #2 on: October 26, 2018, 04:09:12 pm »
@Jwalling - thank you!! Yes, I found: TDA4605 - a switching controller - it must be this guy!!

I will let you know. Thanks!
 

Offline asilva10

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Re: HP 8153A Lightwave multimeter - does not power up
« Reply #3 on: November 02, 2018, 05:55:27 pm »
Problem solved: put a 8-pin DIP socket and installed a new TDA4605. Everything working now !!
 

Offline Jwalling

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Re: HP 8153A Lightwave multimeter - does not power up
« Reply #4 on: November 03, 2018, 09:48:02 am »
Problem solved: put a 8-pin DIP socket and installed a new TDA4605. Everything working now !!

For some reason, the chips made in Austria have a high failure rate.
Jay

System error. Strike any user to continue.
 


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