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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Hello,
I have the following problem on my 2465A. When I am connect ch1 and ch2 to the calibrator, ch2 displays a rectangular signal and ch1 displays something that becomes a triangular signal when I increase the frequency. I have put pictures on: http://scalbert.dyndns.org/IMG_0004.JPG http://scalbert.dyndns.org/IMG_0005.JPG http://scalbert.dyndns.org/IMG_0006.JPG http://scalbert.dyndns.org/IMG_0008.JPG Sorry, pictures are not very good. Any ideas ? Thanks in advance, Olivier |
#2
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In fact it is like I have a capacitor in parallel on the ch1 entry.
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#3
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![]() wrote in message oups.com... In fact it is like I have a capacitor in parallel on the ch1 entry. Yes, that would explain the integration (square to triangle). Obviously, you have switched the probes? |
#4
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Thanks
Obviously, you have switched the probes? Yes, I have changed them and also changed the Volts/Div ![]() |
#5
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" wrote in
ups.com: Hello, I have the following problem on my 2465A. When I am connect ch1 and ch2 to the calibrator, ch2 displays a rectangular signal and ch1 displays something that becomes a triangular signal when I increase the frequency. I have put pictures on: http://scalbert.dyndns.org/IMG_0004.JPG http://scalbert.dyndns.org/IMG_0005.JPG http://scalbert.dyndns.org/IMG_0006.JPG http://scalbert.dyndns.org/IMG_0008.JPG Sorry, pictures are not very good. Any ideas ? Thanks in advance, Olivier you can remove the CH.1 attenuator,take it apart carefully(a plastic frame retains the relays),and use an eraser to LIGHTLY clean the switch pads on the ceramic substrate. *Don't remove the gold plate.* **Don't crack the substrate.** the attenuators are succeptable to outgassing from plastics coating the contact pads. The other part of the switches are the relays,I would not attempt to clean those contacts,maybe spray with a zero-residue/zero lube contact cleaner. you have to remove the front plastic edge trim to access the screws to pull the front panel,to access the screws to remove the attenuator. there's a procedure in the service manual for atten removal. New attenuators are no longer available;TEK does NOT support this product series anymore. -- Jim Yanik jyanik at kua.net |
#6
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Thank Jim.
I will have a look this wee-end. I have not the schematic of the scope. Do you think I can exchange some parts of Ch1 and Ch2 to locate where is the problem ? Olivier |
#7
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On 1 Feb 2007 22:44:59 -0800 "
wrote in Message id: . com: Thank Jim. I will have a look this wee-end. I have not the schematic of the scope. Do you think I can exchange some parts of Ch1 and Ch2 to locate where is the problem ? Olivier You can download a service manual here if you need one: ftp://bama.sbc.edu/downloads/tek/2465a_2467/ |
#8
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" wrote in
ups.com: Thank Jim. I will have a look this wee-end. I have not the schematic of the scope. Do you think I can exchange some parts of Ch1 and Ch2 to locate where is the problem ? Olivier Ch.1 and Ch.2 preamps can be swapped. That and the attens are the whole Channel 1 and 2. IIRC,the BAMA site has the service manual for download. -- Jim Yanik jyanik at kua.net |
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