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3325A A-Cal Failed.
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Mark
Hello All,
I am having trouble tracking down a MC1495 or SG1495 or 1826-0437. Its a 'wideband linear 4-quadrant multiplier' used in the AM and Amplitude levelling in a 3325A. Does anyone sell this chip anymore? Is there a functional / electrical equivalent? Best regards, Mark. PS I have 3x A3 boards, all with the same problem! Symptom is A-Cal fail, All 3 self test fail. The voltages around this IC are all wrong. mcs |
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lothar baier
Have you tried ebay ?
Mark <marks@...> wrote: Hello All, I am having trouble tracking down a MC1495 or SG1495 or 1826-0437. Its a 'wideband linear 4-quadrant multiplier' used in the AM and Amplitude levelling in a 3325A. Does anyone sell this chip anymore? Is there a functional / electrical equivalent? Best regards, Mark. PS I have 3x A3 boards, all with the same problem! Symptom is A-Cal fail, All 3 self test fail. The voltages around this IC are all wrong. mcs --------------------------------- Be a better pen pal. Text or chat with friends inside Yahoo! Mail. See how. |
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John Day
At 09:02 AM 11/20/2007, you wrote:
Hello All,It has been obsolete for some time. Although I have never tried this trick in a 3325A, I have used the Analog Devices AD633 (readily available from DigiKey and others) in other applications where I originally used the MC1495. It might be worth some investigation. I don't think I have the schematics of the 3325A, but if you can post or email me the appropriate section I can try to sketch something out for you. John Day Toronto Is there a functional / electrical equivalent? |
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lothar baier
try , they are not cheap, about $5 ea
Mark <marks@...> wrote: Hello All, I am having trouble tracking down a MC1495 or SG1495 or 1826-0437. Its a 'wideband linear 4-quadrant multiplier' used in the AM and Amplitude levelling in a 3325A. Does anyone sell this chip anymore? Is there a functional / electrical equivalent? Best regards, Mark. PS I have 3x A3 boards, all with the same problem! Symptom is A-Cal fail, All 3 self test fail. The voltages around this IC are all wrong. mcs --------------------------------- Get easy, one-click access to your favorites. Make Yahoo! your homepage. |
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Hi,
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I have repaired a few 3325a synthesizers. I have found that the Sample /Hold switches U20 and U24 have been broken. These are quad devices, only three channels are used in each application. Sometimes swapping them will fix the problem. If you have a manual check service group I The part is an LF13331D. The part is obsolete. A similar, inter-changeable part is used in the 3336 synthesizer/level generators. Good luck !! John Barnes ---------- Original Message ----------------------------------
From: John Day <johnday@...> Reply-To: hp_agilent_equipment@... Date: Tue, 20 Nov 2007 09:15:50 -0500 At 09:02 AM 11/20/2007, you wrote:Hello All,It has been obsolete for some time. ________________________________________________________________ Sent via the WebMail system at aztec-net.com |
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