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Old 16th June 2014, 03:37 AM   #1
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Question Jolida SJ202a Power Transformer

After 18 years, the power transformer shorted out on my SJ202a. Its' outputs are 240V & 300V @300mA, 50V @ 100mA, and 3 x 6.3V @ 3A. I've looked all over the internet with no luck, and I'm afriad what Jolida will tell me. Any help would be gratly appreciated.
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Old 21st June 2014, 04:03 AM   #2
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Default Jolida Transformer Found

Well, after much searching I bought the transformer form Jolida. It set me back $120.00 plus shipping. I'l be posting updates as I go through the process. I hope it will be instructive to anyone else who comes across the same problem.
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Old 30th June 2014, 04:41 PM   #3
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OK, update on the Jolida saga. I ordered the transformer on the 21st, it arrived on the 25th intact. I had asked them to include a schematic, but none was included. I emailed them a couple of times, but no reply. I finally get them on the phone. They say they will gladly to send me one for ten more dollars. I already gave them $120 and they couldn't throw in the schematics with it? Pretty crappy as far as I am concerned. When I get them, I will scan them in and share them with everyone. Now I've got to wait for the snail mail before I can do anything.
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Old 30th June 2014, 05:00 PM   #4
AndrewT is offline AndrewT  Scotland
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A transformer without information on how to connect it !

Threaten to send it back and claim compensation for inadequate installation instruction.
Use PayPal and your credit card company to support your claim.

Complewte product must include use instructions.

Kits, or parts of kits, must include customer support and that includes wiring diagrams.
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regards Andrew T.
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Old 1st July 2014, 08:09 PM   #5
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Thumbs down Jolida Jive

I think they'd rather you send them your amp to them for repairs, so they don't make it easy for you. Some businesses are more DIY friendly than others. What made me mad was that they initially said they would include the schematic, then didn't. Then they ignored my emails, then ended up charging me for it. It's unprofessional, that's all.
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Old 10th July 2014, 09:01 PM   #6
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Default Schematic Arrived

Yea, the schematic finally came Tuesday. I might have time to start working tomorrow. I've attached it if you are curious. Sorry that it's crooked, the copy they sent me was that way.
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File Type: jpg Jolida Schematic.jpg (635.9 KB, 47 views)
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Old 10th July 2014, 09:37 PM   #7
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The 302b/502b is basically the same circuit, with a larger power trans, more B+ and the corresponding changes to resistor values etc., in the PS and bias. The schematic has been floating around the web for years. Shame they made you pay for a copy, but not surprised.

jeff
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Old 11th July 2014, 06:50 PM   #8
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Default Oh Well

I've seen the 302 schematic, but I didn't want any surprises. There's a heck of a lot of wires coming out of the transformer.
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Old 11th July 2014, 06:53 PM   #9
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Operating the Power ON LED without a blocking diode is very poor practice.
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Old 11th July 2014, 07:13 PM   #10
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Quote:
Originally Posted by KatieandDad View Post
Operating the Power ON LED without a blocking diode is very poor practice.
The LED in my amp has outlasted the power switch.

jeff
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