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Old 26th May 2012, 03:42 PM   #1
RiLoWa is offline RiLoWa  United States
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Default TMA T1000.1 Rev. 2.0 Board

This amplifier is missing a couple of capacitors, C322 & C323. Does anyone know what values belong there?
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Old 20th June 2012, 02:35 AM   #2
RiLoWa is offline RiLoWa  United States
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I have temporarily installed some 100uF, 16 caps in those spots.

The next problem I am having with it is pins 8 & 11 of the 594 only have .127 VDC on them with remote voltage applied. All of the other pins look like it should be powering up fine. The first two pictures show the general area around the 594 and the third shows the path, in red, of what I find connected. Pins 8 & 11 are connected to the collectors of the two D667 drivers and to the zener diode labelled ZD301. I think that I am missing a resistor located at R314 above that zener diode as the circuit just ends like shown in red. I don't see how 12VDC could ever be on those two pins without it. I measure B+ voltage on the pad opposite the one connected to ZD301 when remote voltage is applied.

As a temporary test, I applied 12VDC to pins 8 & 11 by shorting pin 11 to pin 12. The amp powers up and will play audio, but the protection LED is also lit. I realize that Pin 12 is probably not capable of delivering the current required for pins 8 & 11 and the collectors of the drivers, it was just a brief test and the short has been removed.

Can anyone advise what value should be installed there?
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Last edited by RiLoWa; 20th June 2012 at 02:53 AM.
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Old 20th June 2012, 07:44 AM   #3
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If one end of R314 has 12v on it and the other end is directly connected to pins 8 and 11, it would appear that a resistor is missing in that location.
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Old 22nd June 2012, 03:08 AM   #4
RiLoWa is offline RiLoWa  United States
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I placed a 150 Ohm, 1W resistor in there and found the 1N4741 zener was defective as it only had ~4.5V across it.

I replaced it with a smaller wattage 12V zener that I have on hand and the amplifier powered up and played audio fine, but I only measured ~8.5VDC across the newly installed zener.

I replaced the 150 Ohm resistor with a 10 Ohm 2W resistor in that location and I now have ~12VDC across the diode and at pins 8 & 11 of the 594. I have ordered the correct zener and will install that when it arrives.
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