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Old 23rd December 2010, 02:19 PM   #1191
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Originally Posted by von.ah View Post
What would cause the relays to rapidly click on and off in succession when powered on? MY T2 board now won't power up properly now that I've put it in a chassis. Everything worked fine months ago when I tested the board...
Hi, pls check what cause the relays to turn off, output DC or HMUTE problem first. Or try to find if there is bad solder on board, like sta505 IC etc.
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Old 23rd December 2010, 02:21 PM   #1192
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there is one more possible reason, the SMPS problem. take a look at the red LED (which is for power indication) and check if it's dimming when relays clicking.
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Old 23rd December 2010, 02:31 PM   #1193
von Ah is offline von Ah  United States
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Thanks. I'll check that and get back to you.
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Old 23rd December 2010, 04:37 PM   #1194
ptiJean is offline ptiJean  France
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As I said to Steinar few months ago I had (and still have, but rarely) the same problem with my T2 :
When switching everything on, the relays do click on and off and on, etc. again and again.
Sometimes just 2 or 3 times, sometimes for 10 min.
Sometimes everything's working fine for one week ...
I didn't find the reason.
Regards,
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Old 23rd December 2010, 08:31 PM   #1195
von Ah is offline von Ah  United States
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My output terminals were poorly fastened. That seems to have been causing the issue. DC offset was fine and I was able to adjust it down to near 0 mV. Maybe tonight I'll secure everything back inside the chassis and hopefully be done...

Whew. I hope it was all just a bonehead-invoked problem.
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Old 24th December 2010, 02:29 AM   #1196
von Ah is offline von Ah  United States
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Well that was wishful thinking. The clicking has stopped altogether. Now I can't get the relays to engage. Green LED doesn't come on, and naturally I can't measure DC offset at the terminals.

Very discouraged.

More data points: one of the four output coils gets really hot, while the others are much cooler; the SMPS is putting out a steady 31.5 VDC; I can hear a very high frequency whine directly from the module; red LED is on, with no flickering.

I certainly don't have the skill to figure this out. I'll probably need someone else to take a look at it.

Last edited by von Ah; 24th December 2010 at 02:34 AM.
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Old 24th December 2010, 06:56 AM   #1197
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I've heard the high freq whine on my Sure board when an output terminal was shorted against the chassis
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Old 24th December 2010, 11:50 AM   #1198
alkasar is offline alkasar  France
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Quote:
Originally Posted by von.ah View Post
Well that was wishful thinking. The clicking has stopped altogether. Now I can't get the relays to engage. Green LED doesn't come on, and naturally I can't measure DC offset at the terminals.

Very discouraged.

More data points: one of the four output coils gets really hot, while the others are much cooler; the SMPS is putting out a steady 31.5 VDC; I can hear a very high frequency whine directly from the module; red LED is on, with no flickering.

I certainly don't have the skill to figure this out. I'll probably need someone else to take a look at it.
Sounds your relay does not engage due to amp protection.

May I suggest that you lower the SMPS to 30V (31.5 is above specs for T2), recheck the input connexions, and recheck the output terminals : no connection at all to ground/chassis here.
Also, check solder on the coils. There were reports on issues due to coils not properly soldered. Maybe damaged during transport. Check all solder
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Old 24th December 2010, 05:54 PM   #1199
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Quote:
Originally Posted by von.ah View Post
MY T2 board now won't power up properly now that I've put it in a chassis. Everything worked fine months ago when I tested the board...

As you say it worked before you put it on a chassis.
So maybe you have accidentally shorted connections.

Check speaker and power connectors.
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Old 26th December 2010, 08:14 PM   #1200
divxfr is offline divxfr  France
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Hi,

what's the notice of Hifimediy T1 no pot sta510A 2*100W@8ohm amplifier ?
Because I am not sound ! The relay is OK.
I do use LIN/GND/RIN cable or not ?

I am not problem with the T2 amplifier !

PLease excuse me for my english !
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