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Recent content by GoDale

  1. G

    Is this a three leg capacitor?

    Can anyone tell me what Thyristors are in use on the US version (110v 60Hz) board? The part on the board says BBC CS1 05g03, but nobody can translate that for me. I tried ordering the BStc1040 as shown in some of the drawings, but my supplier subbed that to an NXP BT151-650C, which did not work.
  2. G

    Is this a three leg capacitor?

    OK, I replaced all remaining resistors on the board which made no difference. I have now made several voltage measurements with the machine in both normal mode and in the failing condition. I started with the voltage found at the common side of the two 15K 2W resistors. Measured from that...
  3. G

    Is this a three leg capacitor?

    Thanks for that information! I had a couple of other projects in the queue, so I was finishing those up to make space on the bench for the sewing machine. I will tear it down this week and see if I can find my sagging control voltage. It would still be great to know if anyone has voltage...
  4. G

    Is this a three leg capacitor?

    I am reading the schematic in previous posts to verify the values of the resistors. The values are different than the schematic, but I am pretty sure that is the difference between the 120V version and the 220V version of the machine. Unfortunately, I have never seen these square (chicklet)...
  5. G

    Is this a three leg capacitor?

    I combined several recommendations and went out to purchase the transistor, zener diode, and the two large resistors. As mentioned in my earlier post, I own the 110V version of this machine, so my large resistors are 2 watt 15K ohm. I figured that since we were talking about less than $5...
  6. G

    Is this a three leg capacitor?

    Before testing the transistor, I did a little more testing and got it to fail. When it failed, it read 16.5 or less DCV, so while it was failing I disconnected one side of the potentiometer, and the voltage stayed the same. Remember, I found the other side of that circuit is common to...
  7. G

    Is this a three leg capacitor?

    OK, I reassembled the machine far enough to take some measurements. I get 18.5 VDC at rest (machine stopped, pedal up), 8 VDC with the pedal pressed just far enough to get the machine going, and 0 VDC at maximum speed. I tested these settings until the machine started to fail, where at rest...
  8. G

    Is this a three leg capacitor?

    Thanks for the quick reply! I have metered the two conductors that run down to the foot-pedal at the power connector with it disconnected. I get the readings that earlier posts indicate: Infinity at rest, as the pedal is pushed, the first reading is 20K ohms, and with the pedal all the way...
  9. G

    Is this a three leg capacitor?

    Thanks to all who have contributed to this thread, I am trying to resolve a problem with our Pfaff 1222, and the information found here has been helpful. My symptom is a bit different, my control works fine for a while, and then after sewing for a few minutes, even with the foot off the foot...
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