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Orion HCCA 2100 no rail voltage.
Orion HCCA 2100 no rail voltage.
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Old 15th April 2019, 08:14 PM   #211
Chopperbuilder is offline Chopperbuilder  United States
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For the brief time the amp functioned properly the voltage was +12.25v.
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Multimeter: Blue Point - Model: MT586B / Oscilloscope: Leader - Model: LBO-524 / Power Supply: Modified computer 500 watt
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Old 15th April 2019, 08:19 PM   #212
Perry Babin is offline Perry Babin  United States
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Are you sure that nothing else is getting hot?
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Old 15th April 2019, 08:23 PM   #213
Chopperbuilder is offline Chopperbuilder  United States
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I've double and triple checked and can find nothing else getting hot.
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Old 15th April 2019, 08:24 PM   #214
Perry Babin is offline Perry Babin  United States
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If I think of something I'll post but I'm out of suggestions.
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Old 16th April 2019, 12:09 AM   #215
Chopperbuilder is offline Chopperbuilder  United States
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I don't know what else to do but put full battery power to it and see what burns up.
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Old 16th April 2019, 03:21 AM   #216
Chopperbuilder is offline Chopperbuilder  United States
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Looks like there is a problem on the audio side of the amp. I figured before I hooked it to a battery I would put full power to it with my power supply(the last time I had it running on full power with my supply the amp shut down ans shut down my power supply with it).

So....the amp powers up and I do some quick voltage checks and everything is as it should be (the resistor is still in place between pins 4 and 7 on the 494) this is including the third leg of muting transistors being at -15.15v DC. (I know I'm as confused as you are about that one as the only thing I did was remove the two voltage regulators and reinstall them). At this point I decide to clamp the amp down in the heat sink power it up and let it play while I keep checks on the voltages. after about three songs I noticed the output transistors where getting quite warm and so checked the voltage across the emitter resistors. The 6488 emitter resistors were at 0.000v while the 6491 emitter resistors were at +0.003 DC on the left side of the board (same side that was high previously) and +0.001v DC on the right side of the board. Also the DC voltage on the RCA shields is at -0.090v.
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Multimeter: Blue Point - Model: MT586B / Oscilloscope: Leader - Model: LBO-524 / Power Supply: Modified computer 500 watt

Last edited by Chopperbuilder; 16th April 2019 at 03:23 AM.
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Old 16th April 2019, 04:03 AM   #217
Chopperbuilder is offline Chopperbuilder  United States
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Oh yeah in saying "everything is as it should be" that is with the possible exception of the +35v DC on the collectors of two A06's.
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Old 16th April 2019, 05:29 AM   #218
Chopperbuilder is offline Chopperbuilder  United States
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Do you have an idea of what could be causing the only the 6491 emitter resistors to be above 0.000v and the voltage on the RCA shields?
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Old 16th April 2019, 09:23 AM   #219
Perry Babin is offline Perry Babin  United States
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All of the emitter resistors of the 6491s above 0.000 but NONE of the 6488s?

Does the voltage on the shields change if you change the value of the 4-7 resistor on the 494?

I think you need to see if things stabilize. Right now, we have a moving target that makes troubleshooting VERY difficult.
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Old 16th April 2019, 09:13 PM   #220
Chopperbuilder is offline Chopperbuilder  United States
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Yes, all of the emitter resistors of the 6491's are above 0.000 but NONE of the 6488's.


I removed the resistor on the 4-7 pins and checked the voltage on the RCA shields, it did not change and remained at -0.090v.
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