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Oscilloscope and Options Operators Manual Other. 070-671 6-00. Product G r o u ~ 46. THE FOLLOWING SERVICING INSTRUCTIONS ARE. FOR USE BY QUALIFIED PERSONNEL ONLY. AVOID PERSONAL INJURY, DO NOT PERFORM ANY. SERVICING OTHER 'THAN THAT CONTAINED IN.

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I bought a Tektronix 2445A oscilloscope from eBay. It was a very good deal for a 4-channel 150 MHz oscilloscope. Por Una Cabeza Violin 1 Pdf. Maybe too good a deal, or so it seemed for a while.

The seller used the usual eBay boilerplate disclaimer for electronic gear — they had turned it on, no smoke came out, it lit up, but they 'were unable to test further'. It was guaranteed not to be 'DOA' ('Dead On Arrival'), which probably means only that smoke shouldn't appear and it should 'light up' when you turn it on, and nothing more. The problem was that the scope would not focus! The very best, with the focus control turned to the end of its range, was as pictured. The trace was at least 1.5 cm wide, and the on-screen indication of vertical scale and horizontal timing was nothing but pale green smudges instead of readable characters. I had not placed a bid on the item until after I had found a PDF file of a service manual.

Places to find service manuals include and Those were discovered by for something like: So, I had a service manual and now it was time to get to work. The alignment procedure includes setting the trace focus as sharply as possible, and then using the astigmatism control (a small screwdriver-set pot below the display) to further refine the setting. Yes, the astigmatism control had some effect, but it seemed as if I needed another 90-180 degrees of rotation on the focus control to get the job done. YOU SHOULD NOT READ BEYOND THIS POINT. ABOVE ALL, YOU SHOULD NOT DO WHAT I DID. IT IS VERY VERY DANGEROUS AND YOUR LAWYER WOULD NOT APPROVE. BUT IT DID FIX MY OSCILLOSCOPE. Call For Help Movie Hd 1080 more.

Removing the case I needed some Torx drivers — T-20, T-15, and T-10 got me through the entire project. I removed the six Torx head screws and then removed the rear panel. High voltage power supply exposed.

MaxTek U400 module failure See those grey modules with heat sink fins in the above pictures? Those are hybrid modules.

Some of them are very prone to failure. Here's how someone described the symptoms to me: After some research with my 2445B I found the failure??, however I am not able to fix it. The vertical amp (U600) is a funny piece of hybrid-ceramic-module (TEK 165 2393 00) see picture attached. According to the schematic there was a potentiometer (R639) for the VERTICAL-CENTER! I set it to the -5V at one end.

Luckily it the move in right direction,but not enough! Office 2010 Ita Con Crack Track. To get it more negative a 2.7K ohm resistor connected to -15V and the U600 (Pin39) moved the picture then to the center now. (-5.7V) Another problem appeared suddenly, the gain changes if you move with vertical-position over the screen!? I believe that the hybrid (U600) is some how defective and I have here no means to test it. And then in later messages: Finally in the end the U400 was defective! Insider told me that this Hybrid U400 (155-0236-00) is defective in 90% of all cases!?

(85 €) And so it was! It seems that there is problem with the MaxTek Version. (155-0236-00 or -09). Tracing the focus control voltage Tracing the control voltage from the wiper on the focus control into the high voltage power supply board, I found that the control had no easily measureable effect on the output of focus amplifier transistor Q1852. The output focus voltage was fixed at approximately -300 V DC.

Further testing showed that the precision 332kΩ resistor R1854 had become an open circuit and now was a fairly precise infinite impedance. With R1854 opened — effectively removed — Q1852 was no longer correctly biased. And so that transistor was not controlling the output voltage as designed. Here you see the circuit biasing Q1852, click on the picture or for the full page from the service manual. Replacing R1854 Above is the view from the opposite side. R1854 is in the row of resistors between the white-topped transformer and the red potted HV circuitry.