Re: HP8562A Errors 304,335,317,333
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The Configuration is a voltage doubler directly coupled on the 60khz switch mode transformer. It is a well known failure that the capacitor goes open. Ofthen with cap getting bulky. Change it to a good 220uF Cap. this will work.
best regards Peter OZ1LPR
Fra: [email protected] <[email protected]> p? vegne af Stephen Hanselman <kc4sw.io@...>
Sendt: 21. april 2020 18:28 Til: [email protected] <[email protected]> Emne: Re: [HP-Agilent-Keysight-equipment] HP8562A Errors 304,335,317,333 ?
I assume that the C301 is connected to the top of the transformer that the lower CR304 is connected.? They are coupling some of the AC from the transformer up to CR301/CR302. I don¡¯t work on doublers very much but that¡¯s what the diode configuration would suggest.? I¡¯m not sure what the +28 is used for but it won¡¯t be very much current and C301 being wonky will keep this circuit from working. ? Steve ? From: [email protected] <[email protected]>
On Behalf Of Peter Hansen
Sent: Tuesday, April 21, 2020 7:59 AM To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] HP8562A Errors 304,335,317,333 ? hello i think it is to galvanize isolate that supply. But it is exact the cap. I bet it is open. just use a 220uf i do that all the time to bring it back. let me know once you tried best regards Peter ?
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[email protected] <[email protected]> p? vegne af stur_mm via groups.io <stuart.ian.richardson@...> ? Peter, ? Have a 2nd PSU to remove and use as Test components. One quick question? ? What type of PSU is this never seen this type of config before! ?
? ? There is no physical connectivity to the Diodes CR301/302 only the decoupling cap C301(Suggested being faulty). Is this a voltage doubling circuit , not sure? ? Cheers, Stu. ?
From: [email protected] <[email protected]>
On Behalf Of Peter Hansen ? Hello It can work stand alone. I have had failures in the PSU in a 180uF capacitor. It was a blue one. It was open and leaked alittle. If you need i Can find a psu and point to it. The cap was open and the 28v was absent. PSU is taken out from the top side all 4 pcb must be folded out and below the alu cover is the PSU. best regards Peter ?
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[email protected] <[email protected]> p? vegne af stur_mm via groups.io <stuart.ian.richardson@...> ? Would Like to say Good news but? ? Managed to get the Analyser on the bench today for a quick check and looks as if 28Volts not there. ? Also getting that smell of Burning rubber so worried could be causing more damage and need to isolate the source and start diagnosing supply. ? Can the PSU work standalone, or is it load conscious? ? Stu. ? ? ? ?
From: [email protected] <[email protected]>
On Behalf Of Peter Hansen ? hello Stu if you look on A2 on the side you see the LEDs for the PSU. All should be LIT. I am sure this is not a PSU issue. If you work through the 300/600Mhz chain with an osilloscope you can check where the signal dissapears. I remember the 600Mhz is made in a doubler and if signal is too small you have not enough for doubling to 600Mhz. best regards Peter ?
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[email protected] <[email protected]> p? vegne af stur_mm via groups.io <stuart.ian.richardson@...> ? Peter, ? Ok from schematic I can see the 600MHz Oscillator ¨¤ Buffer ¨¤ /2 = 300Mhz ¨¤ Offset Loop Buffer. Is that correct? Is it the /2 device your talking about? The whole board seems to be a 600Mhz PLL with 10Mhz ref at source. Correct me if I¡¯m wrong. ? I still think something burn¡¯t out although th PSU looks clean. Just prepping up before getting My hands dirty.. ? Stu. ?
From: [email protected] <[email protected]>
On Behalf Of Peter Hansen ? Hello Stu I must correct my self. The 8562A is before use og MMIC. area is still the same. It is just discrete amplifiers. Order a schematics from Artic media ant look for Radio Frequency module look in the page with the generation of 300/600Mhz. Reason why you can?t measure anything is because the 600Mhz is used for third mixer. best regards PEter ?
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[email protected] <[email protected]> p? vegne af stur_mm via groups.io <stuart.ian.richardson@...> ? Peter, ? Which board are we talking about ? Still looking for the LED PSU indicators on the A2 card. ? Presume you are referring RF board..? Is this an off the shelf part or HP proprietary? ? Thanks, ? Stu. ?
From: [email protected] <[email protected]>
On Behalf Of Peter Hansen ? Hello Group a TAM is not needed in this case. It is simply a MMIC in the 300/600Mhz chain that is bad. I believe Harke has a Hp85629A TAM for sale. best regards Peter Hansen ?
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[email protected] <[email protected]> p? vegne af Don Bitters via groups.io <donbitters@...> ?
I suspect you might be able to rent the TAM from one of the ETE rental outfits for a month or so for not a horrible price.? I believe that Tam Hanna has one or two for sale, I may purchase one from him for my own use with my 8562A.
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