. How to open and clean Tektronix 2225 Ser?. How to fix broken Tektronix 2225 Ser?. How to solve various error codes?. How to repair broken parts and various part numbers?. What is the meaning of various buttons and indicators on device?. How to carry out alignment and routine servicing of your device?
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Thats a good point but unfortunately the connection is symmetrical. Pins 1 and 8 are one transformer circuit, pins 3 and 5 are another and pins 4 and 6 are another. If you invert this they also fit into the transformer circuits. I already tried to connect it the way I thought it was before but nothing happened, no power LED, no smoke so now I'm afraid to try it again, I don't know if I blew the power circuit up because its the other way around and I don't want to take any mode risks. Anyway thanks for your help, apparently there isn't much people available to help me on this.
Tektronix 2205 Oscilloscope
Among my various pieces of old test gear is a Tektronix 2225 oscilloscope. This is a very capable 2-channel, 50MHz scope from the late ’80s. I bought this off eBay some years ago and was pleased that it was in near perfect working order. The only problem was that the exterior was quite dirty and the front panel potentiometers were very noisy.
After a good clean, it looked good but the pots were still a problem. Even so, I use it regularly and always thought I would get around to pulling the front panel board someday and give it a good alcohol bath. Then, a couple of weeks back, I stumbled across a web-shop that sells old Tek parts. And they had a front panel board for the 2225! The shop is and they have tons of stuff for all kinds of old gear, not just Tek.
The price was very reasonable so I ordered the board and received it within a couple of days. And they even guarantee it for a month!
Now, with a ‘new’ front panel board in hand, I got down to the repair. Following the instructions in the service manual, it went smoothly. It required removing the attenuator board and then the front panel board. Here’s a shot of the ’empty’ scope. Here is the stuff that came out. That’s the attenuator board on the left.
One thing that required some effort was transferring the seven ribbon cables from the old board to the new one. (A recently acquired vacuum desoldering station was a big help.) Once the boards were back in, there was a small amount of re-wiring. Since the AC-GND-DC switch on the front panel board is ‘between’ the BNC connector and the attenuator there’s a few resistors that needed to be soldered in place and ground wires reconnected. The resistors are standard values and I just replaced them with new ones. Here it is all back together.
And, it works! Even though the ‘new’ board was removed from another scope, it’s a huge improvement over the original controls and was well worth the cost of the board and effort to install it. Long live the 2225!
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