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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Fri 12, 2018 5:18 am 
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Joined: Nov Wed 22, 2017 6:46 am
Posts: 29
Is this ok https://www.ebay.com/itm/2x-B500K-Guita ... 1438.l2649


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Fri 12, 2018 7:19 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 16976
Location: Albuquerque, NM 87123
It would work, but it has a knurled shaft and the original had a D shaft (half round); the old knob wouldn't fit right. Also looks like it may not come with nut, washer and lock washer; must be metric, so you would have to come up with those if they're not supplied.
Also, comes from China, so there may be a long wait.
This may be a better choice:
https://www.ebay.com/itm/ALLEN-BRADLEY- ... SwsFpaBIwO


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Fri 12, 2018 6:44 pm 
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Joined: Nov Wed 22, 2017 6:46 am
Posts: 29
They have listings with nuts and i know the stem not compatible with know..i can drill out knob and press fit


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Fri 12, 2018 6:47 pm 
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Joined: Nov Wed 22, 2017 6:46 am
Posts: 29
Thanks for the link but ill stick with the lower priced one..im in no hurry and am unemployed so spending $1 instead of $10 is what i need

Thank you.....the link i posted should be compatible other than stem knob issue?


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Fri 12, 2018 6:51 pm 
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Joined: Nov Wed 22, 2017 6:46 am
Posts: 29
Does it matter if it says B500k

Whats the B mean?


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Fri 12, 2018 7:44 pm 
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Joined: May Wed 18, 2011 2:40 am
Posts: 3287
Location: Littleton, MA
Shelby5041 wrote:
the link i posted should be compatible other than stem knob issue?

Judging from the size, they are probably 1/4 watt or 1/5 watt potentiometers rather than 2 watt. It's a little hard to judge from the schematic, but I think the max voltage across the pot is less than 200 volts, therefore the current is at most 0.4 mA, and therefore the dissipation in the pot would be 80 mW. So a 1/4 watt potentiometer should be OK.

Shelby5041 wrote:
Does it matter if it says B500k

Whats the B mean?

No idea. It's not a standard symbol. If it means anything, the meaning is specific to the manufacturer or supplier.

_________________
Steve Byan http://www.byan-roper.org/steve/steve-at-play/


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Sat 13, 2018 1:13 am 
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Joined: Nov Wed 22, 2017 6:46 am
Posts: 29
Hi ..update

I think i fixed the orig b+ pot

I took the pot off and put pliers to it and oiled it and worked it free.....it was pretty bound up but i got it to move ok

One issue is that originally 2 wires tore off that connected to the pot....there are 3 terminals and a green wire..yellow wire..and blue wire...i know where the green wire connects to but not sure on the blue and yellow to the pot

Can anyone guide me?


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Sat 13, 2018 1:30 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 16976
Location: Albuquerque, NM 87123
The center tap of the control goes to a 1 meg resistor; high side terminal goes to a 680k resistor; low side to 240k. High side means the control is in the maximum clockwise position.


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Sat 13, 2018 1:53 am 
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Joined: Nov Wed 22, 2017 6:46 am
Posts: 29
Sorry not sure ....i took bottom off and the yellow wire goes to location ac on the board which is to a resistor 4 band red yel yel gold

Blue goes to location ad on the board....4 band resistor not sure colors brown green black brown?

Green goes to location ab on board...resistor 4 band blue grey yellow gold?

Would have to figure out values

I know green wire goes to on the right terminal if the round alum backing is facing you with terminals on lower side


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Sat 13, 2018 2:00 am 
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Joined: Nov Wed 22, 2017 6:46 am
Posts: 29
Ok got it..tested resistor values with multimeter...you are awesome...thanks


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Sat 13, 2018 2:09 am 
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Joined: Nov Wed 22, 2017 6:46 am
Posts: 29
Ok confirmation

Loking at pot with stem facing you and terminals on top...

Left terminal is yellow 240k
Center terminal is blue 1m
Right terminal is green 680k

Correct?


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Sat 13, 2018 5:11 am 
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Joined: Nov Wed 22, 2017 6:46 am
Posts: 29
Ok i resoldered wires back on the pot....it seems to turn ok but the first 1/4 turn it seems like shaft grinds a bit bit it could be due to trying to free it up all the force throught it off center....im hoping ita juat cosmetic only and not affect the pots functioning....

Ive never fired this unit up..found it in trash....if i plug in im hoping it doesnt explode


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Sat 13, 2018 7:20 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 16976
Location: Albuquerque, NM 87123
Just make sure you have the right fuse in it. If it blows, do not try again until you find the problem.

Can you post photos?


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Sat 13, 2018 2:29 pm 
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Joined: Nov Wed 22, 2017 6:46 am
Posts: 29
There is a fuse in it right at ac input......there are a few caps that are slightly bulged on top....

I heard somebody firing one of these up and one of the components exploded....so ill fire it up outdoors ..i tried to post a photo but itvwas too large file and i already assembled it back together...ill see if i can resize the photo


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Sat 13, 2018 2:44 pm 
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Joined: Nov Wed 22, 2017 6:46 am
Posts: 29
Not sure this photo worked tried to resize


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Sat 13, 2018 2:45 pm 
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Joined: Nov Wed 22, 2017 6:46 am
Posts: 29
Way too small ill try again


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Sat 13, 2018 2:49 pm 
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Joined: Nov Wed 22, 2017 6:46 am
Posts: 29
Try to resize again


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Sat 13, 2018 2:52 pm 
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Joined: Nov Wed 22, 2017 6:46 am
Posts: 29
3rd time resize


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Sat 13, 2018 2:59 pm 
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Joined: May Wed 18, 2011 2:40 am
Posts: 3287
Location: Littleton, MA
Shelby5041 wrote:
Loking at pot with stem facing you and terminals on top...

Left terminal is yellow 240k
Center terminal is blue 1m
Right terminal is green 680k

Correct?

Yes, that's correct.

_________________
Steve Byan http://www.byan-roper.org/steve/steve-at-play/


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 Post subject: Re: Heath zenith sp-2717a Dc power supply help needed
PostPosted: Jan Sat 13, 2018 8:23 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 16976
Location: Albuquerque, NM 87123
Make sure the fuse is no more than 1.5 amp.


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