Please help me fix my Phonic 2500 Pot? - diyAudio
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Old 8th May 2010, 04:44 PM   #1
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Default Please help me fix my Phonic 2500 Pot?

Hello, please can someone help me, I have a phonic 2500 amp that plays perfectly from channel 1 but channel 2 is stuck at full volume regardless of the position of the volume pot on the front.
Please can someone tell me if its likely i need a new volume pot for channel 2 and if i do, what spec it needs to be, part number etc or a service manual that contains the info.
Thanks in advance. Al.
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Old 8th May 2010, 08:31 PM   #2
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You need to measure the pot with a multimeter to determine if it is faulty or not.
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Old 9th May 2010, 09:07 AM   #3
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Thank you, I'll try that. Do i need to remove it from the amp or can i check it while its still attached?
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Old 10th May 2010, 02:01 PM   #4
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Have tested that pot and it definately isn't changing the resistance, checked i was doing correctly on channel 1 and that does change, I have also noticed that the fan isn't working, i removed it and tested it externally and it is fine,but not working when attached to the amp.

Any idea if the broken vol pot would be effecting the power to the fan?

Also, now i have the amp home every other time i switch it on it trips the fuse box for the sockets in the house. I have tested 3 internal fuses and the fuse in the plug and all are ok.

Are there more fuses somewhere?

Any idea what could be causing this?

Many thanks, Al.
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Old 10th May 2010, 07:16 PM   #5
jaycee is offline jaycee  United Kingdom
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Quote:
Originally Posted by Turkeyman View Post
Have tested that pot and it definately isn't changing the resistance, checked i was doing correctly on channel 1 and that does change, I have also noticed that the fan isn't working, i removed it and tested it externally and it is fine,but not working when attached to the amp. Any idea if the broken vol pot would be effecting the power to the fan?
It won't affect it. It's possible the fan only comes on as the heatsink warms up.

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Originally Posted by Turkeyman View Post
Also, now i have the amp home every other time i switch it on it trips the fuse box for the sockets in the house. I have tested 3 internal fuses and the fuse in the plug and all are ok.
This looks like a stage amp. My guess here is the amp consumes a high inrush current when turned on, and that trips the breaker. What rating is the circuit, 15A or 32A ?

As for the pot, what markings are on it?
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Old 10th May 2010, 08:39 PM   #6
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Quote:
Originally Posted by Turkeyman View Post
Have tested that pot and it definately isn't changing the resistance, checked i was doing correctly on channel 1 and that does change, I have also noticed that the fan isn't working, i removed it and tested it externally and it is fine,but not working when attached to the amp.

Any idea if the broken vol pot would be effecting the power to the fan?

Also, now i have the amp home every other time i switch it on it trips the fuse box for the sockets in the house. I have tested 3 internal fuses and the fuse in the plug and all are ok.

Are there more fuses somewhere?

Any idea what could be causing this?

Many thanks, Al.
Yes you need a new pot then.
I cant imagine the pot affecting the fan unless the pot has gone open and is affecting somehow the DC conditions of the amplifier and the amp has gone into protect mode.
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Old 11th May 2010, 11:30 AM   #7
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Quote:
Originally Posted by jaycee View Post

This looks like a stage amp. My guess here is the amp consumes a high inrush current when turned on, and that trips the breaker. What rating is the circuit, 15A or 32A ?

As for the pot, what markings are on it?
Hi Jatcee, thanks for your reply, I'm not sure what the rating of the circuit is, how can i find this out.

The pot is marked with ( 134F 5KAX2 )

Thank you. Al.
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Old 11th May 2010, 11:32 AM   #8
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Quote:
Originally Posted by nigelwright7557 View Post
Yes you need a new pot then.
I cant imagine the pot affecting the fan unless the pot has gone open and is affecting somehow the DC conditions of the amplifier and the amp has gone into protect mode.
Thank you, will try replace the pot and see what happens, hopefully it will sort it.

Thank you for your help. Al.
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Old 11th May 2010, 11:53 AM   #9
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Originally Posted by Turkeyman View Post
Also, now i have the amp home every other time i switch it on it trips the fuse box for the sockets in the house. I have tested 3 internal fuses and the fuse in the plug and all are ok.
this amp's soft turn-on function isn't as good as it should be, but nothing to worry about.
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Old 11th May 2010, 02:43 PM   #10
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Originally Posted by powerflux View Post
this amp's soft turn-on function isn't as good as it should be, but nothing to worry about.
How is it nothing to worry about if its tripping the main fuse box? If i take the amp to a venue and trip their fuses for all their plugs, dont think they'll be too happy, it didn't do this before it started playing up.
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