Home |
Search |
Today's Posts |
|
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. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to sci.electronics.repair
|
|||
|
|||
TEK 2445 scope help
Hi all,
I bought 3 'used' TEK 2445 scopes ($60 for all) from a local company that just wanted to clear some space in their warehouse. I was able to get two of them up and running by swapping some of the components that were damaged. The third was obviously dropped against the HIGH voltage board that drives the CRT. Both power up fine now, and one seems to be working just fine. The second one gives a strange output with nothing connected to it. The trace seems Ok near 0 on the vertical scale, but if I adjust the vertical position, the trace get wide, and will trigger a sawtooth profile. The amplitude for this profile gets larger the further away form 0 I get. It is too repeatable for noise. Is there an adjustment for this? Or is it a bad component/board? Any help would be appreciated. I'm also curious what value it is to have them "calibrated". There is a local shop that will do it for $110. Any thoughts? I know the HV dangers that are posed inside the scope and take all precautions to prevent electric shock. Thanks in advance for your help. Mike Henry |
#2
Posted to sci.electronics.repair
|
|||
|
|||
TEK 2445 scope help
I also have some screen shot photos
This link connects to Snapfish screen shot photos. http://www2.snapfish.com/thumbnailsh...3/t_=114757653 02 is No signal connected to Ch 2 - V pos centered 01 is No signal connected to Ch 2 - V pos up max 04 is No signal connected to Ch 2 - V pos down half 03 is No signal connected to Ch 2 - V pos down max 00 is Ch 2 - calibration signal "Mike Henry" wrote in message ... Hi all, I bought 3 'used' TEK 2445 scopes ($60 for all) from a local company that just wanted to clear some space in their warehouse. I was able to get two of them up and running by swapping some of the components that were damaged. The third was obviously dropped against the HIGH voltage board that drives the CRT. Both power up fine now, and one seems to be working just fine. The second one gives a strange output with nothing connected to it. The trace seems Ok near 0 on the vertical scale, but if I adjust the vertical position, the trace get wide, and will trigger a sawtooth profile. The amplitude for this profile gets larger the further away form 0 I get. It is too repeatable for noise. Is there an adjustment for this? Or is it a bad component/board? Any help would be appreciated. I'm also curious what value it is to have them "calibrated". There is a local shop that will do it for $110. Any thoughts? I know the HV dangers that are posed inside the scope and take all precautions to prevent electric shock. Thanks in advance for your help. Mike Henry |
#3
Posted to sci.electronics.repair
|
|||
|
|||
TEK 2445 scope help
Here is Flickr pix in case you don't have Snapfish acct.
http://www.flickr.com/photos/15503604@N06/?saved=1 "Mike Henry" wrote in message ... I also have some screen shot photos This link connects to Snapfish screen shot photos. http://www2.snapfish.com/thumbnailsh...3/t_=114757653 02 is No signal connected to Ch 2 - V pos centered 01 is No signal connected to Ch 2 - V pos up max 04 is No signal connected to Ch 2 - V pos down half 03 is No signal connected to Ch 2 - V pos down max 00 is Ch 2 - calibration signal "Mike Henry" wrote in message ... Hi all, I bought 3 'used' TEK 2445 scopes ($60 for all) from a local company that just wanted to clear some space in their warehouse. I was able to get two of them up and running by swapping some of the components that were damaged. The third was obviously dropped against the HIGH voltage board that drives the CRT. Both power up fine now, and one seems to be working just fine. The second one gives a strange output with nothing connected to it. The trace seems Ok near 0 on the vertical scale, but if I adjust the vertical position, the trace get wide, and will trigger a sawtooth profile. The amplitude for this profile gets larger the further away form 0 I get. It is too repeatable for noise. Is there an adjustment for this? Or is it a bad component/board? Any help would be appreciated. I'm also curious what value it is to have them "calibrated". There is a local shop that will do it for $110. Any thoughts? I know the HV dangers that are posed inside the scope and take all precautions to prevent electric shock. Thanks in advance for your help. Mike Henry |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Tektronix 2445 HV discharges on A9 | Electronics Repair | |||
Wanted BNC input socket Tec 2445 scope Ch1,2,3,4 | Electronics Repair | |||
Tec 2445 , Broken trace , looks like a noisey brightness control | Electronics Repair | |||
HP1805A Dual Channel Scope plugin (100MHz) for 180 series scope | Electronics Repair | |||
Tektronix 2445 Reliability and Noise On Channel 2 | Electronics Repair |