Bottlehead Forum

Bottlehead Kits => S.E.X. Kit => Topic started by: AJWard549 on June 14, 2021, 12:21:32 PM

Title: S.E.X. PT secondary test [resolved]
Post by: AJWard549 on June 14, 2021, 12:21:32 PM

Hi everyone, after years of lurking I have finally taken the plunge and ordered a 3.0 kit. My initial voltage check should 120 v AC coming into the IEC. But my secondary test on page 35 is only showing 4 volts max at position 7 on the PT. Interestingly, the reading is 0.0 if I have the red probe tip on position 9 as instructed with the black probe on 7. As soon as I remove the red probe, the meter starts reading and tops out at 4 volts.

I have gone back over my connections and everything seems to be in order after reheating all of the terminals. Thoughts?

Andrew

Title: Re: S.E.X. PT secondary test
Post by: Paul Birkeland on June 14, 2021, 12:30:37 PM

To measure those voltages, you must have one probe on 7 and the other probe on 9.

If your meter has a limited number of AC voltage scales, it may not be able to resolve 6V.  This would be true of something like the $6 meter at Harbor freight that has a 200V and a 700V AC scale.  6V just isn't significant enough to be read accurately. 

I would perform the second test that measures the 160V winding.  If you are unable to measure 160V, then there is something that needs to be addressed.

Title: Re: S.E.X. PT secondary test
Post by: AJWard549 on June 14, 2021, 02:17:37 PM

Thank you Paul. It could be my meter for sure, it was very inexpensive. I attempted the check with the probes on terminals 11 and 12 and still not working. I only get a reading with one probe in place again, when both are in place the meter zeros out.

I am including a photo of the work so far in case there is something glaringly obvious to anyone!

Thanks
Andrew

Title: Re: S.E.X. PT secondary test
Post by: Paul Birkeland on June 14, 2021, 02:37:03 PM

Yes, you have a wiring error at the IEC power entry module.

Title: Re: S.E.X. PT secondary test
Post by: AJWard549 on June 15, 2021, 01:23:46 AM

AH!!! I see!, thank you I will correct this when I get home this afternoon and re-check voltages!

Title: Re: S.E.X. PT secondary test
Post by: AJWard549 on June 15, 2021, 11:22:56 AM

THANK YOU!

I corrected my wiring on the IEC and my voltages are now in range! I will now progress ahead  ;D

Andrew

Title: Re: S.E.X. PT secondary test [resolved]
Post by: AJWard549 on June 23, 2021, 03:17:00 PM

Thanks again Paul for your help, I have now completed my build! I am running my final voltage checks (resistance checks were all good), and I am getting no reading on terminal 17. Everything else checks out. Solder joint looks good, all connections look good. Scratching my head here! Any thoughts?

Title: Re: S.E.X. PT secondary test [resolved]
Post by: Paul Birkeland on June 23, 2021, 04:07:02 PM

What voltage do you get on 25?

Title: Re: S.E.X. PT secondary test [resolved]
Post by: AJWard549 on June 26, 2021, 09:06:32 AM

13.5 v

Title: Re: S.E.X. PT secondary test [resolved]
Post by: Paul Birkeland on June 26, 2021, 12:39:59 PM

Ok, 25 connects to pin 10 on the OT-2, check the voltage there.

Pin 10 on the OT-2 is wired to pin 5 on the OT-2, check the voltage there.

Pin 10 on the OT-2 is wired to terminal 17.

All these terminals should show that 13.5V.

Title: Re: S.E.X. PT secondary test [resolved]
Post by: AJWard549 on June 27, 2021, 10:45:22 AM

Had a mis wired connection, all is now correct and reading 13.5 v (in DC)