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Old 23rd July 2009, 06:35 PM   #11
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In the large amps that have separate power supply and audio boards, you can insert low value (2-4 ohm, 5w or greater) resistors in series with the positive and negative rail jumper wires. It will help prevent blowing output FETs.
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Old 23rd July 2009, 07:47 PM   #12
lee1976 is offline lee1976  Poland
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Thank you for your reply

Initially I tried to run the amplifier on proxy MPSA56 transistors and MOSFET 4pieces as Dimon74 wrote, but I heard only bumm transistor PZTA56 (original) on a second channel MOSFET and the full short-circuit
At the moment, ordered a set of drivers and the LM5110, but without the power supply load power is only 145 + VDC, -VDC no (-3VDC), Diodes are OK, ACV before diode is approximately 90ACV is OK....
Voltage measured with regard to the point GND
This point GND of the power amplifier power level is a massive power amp 12v B+
This point is not the middle off the transformer cascade capacitors .... ever seen a common capacitor "+ -" from the mid-point of the transformer and it was a point of power amplifier GND
This is an oddity

Sorry for my poor english
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Old 23rd July 2009, 08:27 PM   #13
Dimon74 is offline Dimon74  United States
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I can't help you more with this amp.I repaired T10001BD and T20001BD they use two UC3706DW drivers, in your amp is different schematic.Now I have for repair P10001BD .This amp use same drivers IC like in your amp.I'm waiting for new IRFP260N.Probably will start to work on it in Sunday,then let you know if I find out something.
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Old 23rd July 2009, 08:38 PM   #14
lee1976 is offline lee1976  Poland
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I do not understand the principle of operation of the converter SMPS, who is the mass of power? why capacitors are connected only with the HV + and HV-..... I would like to see a similar pattern to understand the operation of the power supply

When you connect the load resistors for HV 22Ohm + - I have the respect of GND voltage around 50V HV + and HV- 20-30v (I do not remember)
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Old 23rd July 2009, 08:39 PM   #15
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The Rockford class D amps have floating secondaries for the output stage. They use half of the outputs to switch the rail voltage and half of the outputs to produce the audio output.

When working on these amps, if you have to make contact with the board it's important that you discharge the rail caps after the amp is switched off. They can store significant energy in the rail caps for weeks.
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Old 23rd July 2009, 10:01 PM   #16
oPossum is offline oPossum  United States
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Rockford class BD topology

Figure 10 is a simplified schematic of the amp output.
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Old 23rd September 2009, 04:47 PM   #17
lee1976 is offline lee1976  Poland
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Default Thanks friends

Hello after a long break

Amplifier running thanks to your help, after an exchange (LM driver) everything started working.


Great Thanks

Regards.
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