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Old 11th April 2009, 12:40 PM   #1
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Default orion 800.2 amp

when i got this amp the two big brown resistors were unsoldered from the board...i put them back in. powered the amp up ,and now they get so hot they will unsolder from the board again.....???

ive tested all the small transistors around the brown resistors, and the gate drive transistors they have 2 readings of 0.6....

i dont have any shorted power supply transistors or outputs, or a shorted torrids... ive never seen resistors get so hot it falls out of the board by itself...lol

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Old 11th April 2009, 08:47 PM   #2
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Are these resistors in series with Zener diodes (generally orange or silver)?
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Old 12th April 2009, 08:50 AM   #3
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there are 2 black with a silver stripe zeners that are hooked to them, plus the 4 zeners in between the torrid and the brown resistors...
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Old 12th April 2009, 08:58 AM   #4
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I don't think the diodes in the group of 4 diodes at the end of the resistors are Zeners. The ones connected to the resistors may be Zeners. Can you read the numbers on them?
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Old 12th April 2009, 09:12 AM   #5
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edit; the 2 glass diodes do not run to the big resistors...i had to cut away the glob of silacone to see where it went....

the part numbers of the 4 grouped diodes are.....all i can make out is FR54 ? FP54?

should i fire it up and get some readings from the 949?
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Old 12th April 2009, 09:51 AM   #6
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The large resistors are commonly used in regulators. They go between the rail supply and a zener diode. The other end of the zener diode goes to the secondary ground. Is that what you have?
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Old 12th April 2009, 10:33 AM   #7
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im not sure perry.

there is a single wire coming off the torrid that is running to one of the big resistors...
the group of 4 diodes are running i between the rail and the big resistors, which are connected to the secondary ground .... the secondary ground is the black wire that mounts to the heatsink right?.
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Old 13th April 2009, 04:13 AM   #8
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I'm not familiar with the amp so I can't help much more without more information.

The secondary ground is generally tied to the non-bridging speaker terminals. If the Zeners were connected to the secondary ground, they should be connected to the non-bridging speaker terminals. If you find that there is 0 ohms between the non-bridging speaker terminals and the Zeners, then they may be the Zeners being used for voltage regulation (15v). The Zeners for the 15v will have ~15v across them.
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