Hi YG, I would guess you are talking about the three piece flex couplers with the center nylon flex piece for 1/8" shafts, as they are the only shaft connector parts that usually crack. I just checked

Here's an addition to my recent comments about some 22xx power supply problems. The problem I described where the value of R912 was increased to improve a 22xx power supply's ability to function under

Hi David, This is all going to be fun to read and learn about, but as a parallel practical check on it all I would like to see the person with the problem 2230 power the inverter with about 43 VDC (as

Hi David and Dave, Thank you for this informative exchange that applies to the power supply of so many of these nicer 22xx oscilloscopes! David Hess always tries to analyze the problems and the relate

HI Ed, Thank you for this excellent tip about C719 in the 576 curve tracer! I opened a 576 and C719 was exactly as you have described. The leaking acid had barely gotten to one solder pad and not quit

Hi David Thank you for your reply to the recent good wishes you received. It's good to hear that all should be well very soon! tom jobe...

Hi Steve, How are all of the low voltages looking? As you know, they are all quite necessary for the scope to function. The "Adjustment Procedure" section of the 2215 service manual starts off with ho

Hi David, I have a nice selection of the scopes in question and I follow most of the Tekscopes discussions about these 22xx / 24xx and I haven't seen any of the 'unexplained failures' that you mention

I'm really enjoying this discussion about the 2230 PSU repair, as you use excellent logic and reason to work your way through the problem. The 2230 PS differs from the simpler small 22xx's such as the

Thank you for posting the results of your 2213 repair! Your information will be in the Tekscopes Message archive for years to come and help many other people. tom jobe...

The MPQ3725 array worked fine in more than one fan repair. I would not have had the knowledge or good sense to think about having matching transistor specs in the array. I'm surprised that your fan su

The service manual for the 475 shows the fan board's original NPN array U1690 as being a MPQ2221 which is a 500 mA rated part. A look in my bag of fan parts shows that I have replaced bad ones with an

I think the part number being looked for is 366-1280-00. Some 465 and 475's I looked at had that same knob on the trigger controls. tom jobe... wrote:

Hi John, In my limited experience the tantalum caps at the output of each low voltage on the 4XX power supplies are the most troublesome ones, especially the 10 to 33uF caps such as C1448, C1458, C146

eBay has a nice selection of 3-48 set screws on offer, and they are listed as having an .050" hex in them. tom jobe...

Hello Leetmaster, If you were able to remove the 3-48 set screw somehow, a 3/32 (.0935" across the flats nominally) Allen wrench would not even fit into the empty threaded hole, so something must be w

Hi Valentin, Would a trip to your local auto supply store get you a small tube of RTV for a smaller amount of money? tom jobe... [Non-text portions of this message have been removed]

Hello and a big 'Thank You' to everyone who has participated in this excellent discussion of capacitors! The books we have do not give us amateurs the kind of good information that you knowledgeable f

Hi Valentin, It's good to see you posting on Tekscopes again! About securing those capacitors in the black box... I've had good results using two plastic zip ties to lightly hold the smaller diameter

Just for the record... the voltage to the 12 volt fan was 10.13 volts on a high serial number 2224 with the later style fan that I just checked. As I remember there is no thermal control of the fan vo