Phonoland

Forgive me if this has been covered.
In short, zero output from autospeed. I have removed and tested all capacitors, the one furthest out was the large one which read 7 f when I think it should be 4. All diodes are good. The .75 ohm resistor reads 1.5 ohms.
Everything else seems fine except I'm unsure on how to test the transistors.
Do transformers die on these? I thought they usually were quite strong.
Oh and sorry I didn't mention it earlier, it's a type 45TASU2

R/O 449,
Anything, and everything, "can die"on these, as well as on any electronic product.
I do rebuild them, and stress test them, with the Seeburg factory test jig. Contact me off forum, if you would like me to rebuild it. Ron Rich

Would it be a simpler fix to find the proper gears to make it run 45 rpm? Just a thought since I'll never run a 33rpm record on it.

"Would it be a simpler fix to find the proper gears to make it run 45 rpm?"

In a word: No.

Changing those gears -note plural is a pain in the ass. It involves major disassembly of the mech and removing some often stubborn roll pins.

I went through this in fall 1989 when i got in a "K" from the UK with 50hz gears. A year later when I needed a hideaway to run colsolettes in a diner, all I had was an HLPC I just rebuilt the speed unit.

There are so few components in that unit it makes no sense to go another route. In the case of floor models, making a radical change such as this can adversely affect the value of the machine (I should talk after what I have done to some of these circuits).

As for testing transistors, if your meter has a 'diode test" the testing of those common transistors is easy.

This is a case where testing with a hot chassis is the way to go -if you are comfortable with this approach. Start out checking that the relay engages when a record is clamped and then use the schematic.

If it does, check for around 25VDC on C2102 (1000mfd @30volt). Check the condition of the speed adjust pot. these are often a problem with dead spots or open windings. Check the diodes. If you have a capacitor function on your meter check the 4 mfd@370vac capacitor.

Do you have a schematic?

Rob/NYC

I have only changed that pair of gears twice and both on LPC's, I found it fairly easy but then I have the correct tools to hand.

I would be inclined to take Ron up on his offer of checking out the unit.

Regards
Alan

Alan Hood
ami-man
UK

Hi Rob,
I do have a schematic. C2102 I get zip. The diodes are good. I rechecked the big cap and have OL. I could have sworn it read 7 when I first got it home. Think the bad cap has burnt anything else?
I'll look for a 350v. 4 uf cap and update you. Thanks for the help.
Greatly appreciated.
Rick.

Rick, you need to first find out why you are getting "zip" at that first filter C2102. Check for AC on the Red wires from T2101 going into the diodes, then work backwards toward the relay, the Molex plug and socket. On these transistor speed units the entire device is switched on each time a 45 is played. So any contact failure along the way will lead to a dead unit. This is different from the tube units where there was always voltage present and only B+ was switched internally by a relay.

Rob

**UPDATE**
I installed a new c2101 and a new r2103. I have a steady 27 VDC at c2102.
No joy on the autospeed yet, but I hope I'm making progress.
The new development is that now the transistors get very warm. Does this ring a bell out there?
Thanks in advance.
Rick.

I am getting 27 VAC on the red wires from t2101.

Up and running. As always thanks for all the help.