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Problems with HP8753C networkanalyzer
hi group I have a HP8753C analyzer option 6 (6Ghz) that has a HP85047 testset. I get the following error when power on. No IF found check R input levelPhase lock lost when I se my display I have not
By Peter Hansen · #38448 ·
Photos of the HP 85662A measurments
The photos taken during the search has been uploaded in the photos section (on1ev) cheers [:)]
By Guy DAIPRA · #38447 ·
HP 85662A Display power supply issue solved
Hello group , finally the problem has been solved, the cause was an 30.000?F completely dry, this capacitor named C4 in A23 was in the power supply of the RF section and not in the display section.
By Guy DAIPRA · #38446 ·
Re: Favorite bad capacitor debugging techniques?
One thing I would never do is put in a bigger fuse. A switcher might not start up using a lightbulb. Besides things allready named like following the current and looking for low voltages i do the
By PA4TIM · #38445 ·
Re: Favorite bad capacitor debugging techniques?
Dave, Based on your reference to having multiple vertical mounted caps I would assume you are talking about a SMPS. Personally I would not restrict yourself to the capacitors alone. Typically caps are
By zl2bkc <w.knowles@...> · #38444 ·
Re: Favorite bad capacitor debugging techniques?
With good desoldering gear (likle a Pace solder sucker) you can pull parts with little risk, if you are careful. Otherwise, apply a current limited source to the power rails and check the voltage
By J. Forster <jfor@...> · #38443 ·
Re: Favorite bad capacitor debugging techniques?
As has been mentioned, the proper equipment makes a huge difference in parts replacement. If the board is that critical I would replace all the capacitors as a starting point, and check the diodes
By Peter Gottlieb <hpnpilot@...> · #38442 ·
Re: Favorite bad capacitor debugging techniques?
Are you sure all the caps are installed the correct way? My experience has been that the aluminum electrolytic fail open or low capacitance and tantalums fail shorted. You could put a 100 watt light
By Tom Miller <tmiller@...> · #38441 ·
Re: Favorite bad capacitor debugging techniques?
David Speck wrote:
By Bob Smither · #38440 ·
Favorite bad capacitor debugging techniques?
Looking over the list, I have noted that the majority of problems with old equipment is failure of the electrolytic capacitors in the power supplies over time. I wonder if the veterans can offer any
By David Speck · #38439 ·
Re: Which HP spectrum analzyer is structurally most similar to that of HP 8565A?
Thanks for the words of encouragement. The two problems now for me are: time and money..... Amos ________________________________ To: hp_agilent_equipment@... Sent: Tuesday, August 30,
By Amos Ku <amosku@...> · #38438 ·
Re: Which HP spectrum analzyer is structurally most similar to that of HP 8565A?
Amos, if you design and build such a device, I think many people would be interested in it --- 73 Eugene W2HX Sent: Friday, August 26, 2011 2:41 PM To: hp_agilent_equipment@... Subject:
By W2HX · #38437 ·
Re: HP8593A Power Supply repair
Hello KO4BB, Thanks for invitation. Upload done. Regards/Roumen LZ3RV
By Roumen · #38436 ·
Re: HP 204B Modifications.
Jeanette, I had heard that as well. Do you remember what year the audio express article was published? George
By Glydeck · #38435 ·
Re: HP 204B Modifications.
There was such a modification in June and July issues of AudioXpress (which, I am going to guess, you don't have!). Uses a pair of 1N4742 12V 1W zeners to split the supply. There's an important
By caveteursus · #38434 ·
Re: HP8593A Power Supply repair
Upload it to KO4BB.com....
By Artekmedia <manuals@...> · #38433 ·
Re: HP8593A Power Supply repair
Hello all, Due to our "Files" area restriction ( it is full ) I can not upload what I promised few hours ago. Sorry ! In any case I will send to anyone who wish. Just ask. Regards. Roumen / LZ3RV
By Roumen · #38432 ·
HP8593A Power Supply repair
Hello all. First - please excuse my bad English. I am going to share my experience to restore defective HP8593A Power Supply (PS). Nothing useful found in the net...except: you can send PS for repair
By Roumen · #38431 ·
Re: 8558B centre frequency wildly unstable above 1250MHz
Be carefull with what you spray in. Some of those things conduct very good, resulting in a potentiometer that is not reacting anymore. I have just repaired a transcreiver where the former owner had
By PA4TIM · #38430 ·
Re: 8558B centre frequency wildly unstable above 1250MHz
I forgot to mention that it is important to glue the plastic tube to the nozzle otherwise the pressure will send the whole assembly including needle across the room. I used a plumbers PVC adhesive.
By ferrymanr <g4bbh@...> · #38429 ·