Transistor Part Numbers for Q130-Q139 in a Kole PH2-3000D - Page 3 - diyAudio
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Old 11th December 2012, 12:54 AM   #21
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Default Also, R204 (1K) is cracked but reads ok

Also, R204 (1K) is cracked but reads ok.

I shoulda checked the rails before installing outputs, I was in a hurry. (Worst time to do work). But with the neg 40 volts still present on pos speaker terminal, I suspect that the problems is elsewhere, right?

The rails come up ok, but drop and swing back up repeatedly. I disconnected the (-In) to the driver card earlier (to verify whether the neg voltage was present in preamp; it wasn't, but the -IN on the card still had the neg voltage.), didn't make a difference in symptoms.

PS.. before readings in above posts I replaced R173..
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Old 11th December 2012, 12:55 AM   #22
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Also, caps on driver card ok. Will run through with ESR meter after nap.
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Old 11th December 2012, 01:39 AM   #23
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Have you replaced R124 and R125 on the driver board?
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Old 11th December 2012, 08:09 AM   #24
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Default Do you mean

I replaced Q124 and Q125, also R173 and R190. I haven't done Q116 yet.

BTW, I misquoted the model number in the title, its QX1-3000D, sorry.
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Old 12th December 2012, 02:02 PM   #25
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Default Anyone have a schematic for a Planet Audio vx2200 or a Kole QX1-3000D?

So, anybody got a schematic on this one?

Is it something dumb I'm missing?

So is it safe for me to disconnect the output gates temporarily to make sure that the neg voltage isnt coming from an output - that it to narrow it to the driver board?
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Old 13th December 2012, 07:21 AM   #26
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You cannot disconnect the gate legs of the output transistors. If you do without removing the outputs completely, they will fail.

If you have a scope, you can remove the outputs, drive a signal into the amp and check the drive signal.
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Old 13th December 2012, 10:24 PM   #27
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Hey folks, on the driver cards for these amps there are twelve connections - the functions of some are obvious, but some are not - in the below list, what do 6 and 9 do?
1 IN+ (balanced input pos)
2 IN- (balanced input neg)
3 SG (signal ground)
4 +15 (pos op-amp supply voltage)
5 -15 (neg op-amp supply voltage)
6 SW ????
7 Vpp (pos rail?)
8 DRV (drives pos bank of outputs)
9 Out ????
10 PG (power ground?)
11 DRV (drives neg bank of outputs)
12 Vnn (neg rail?)

The silk screen marks 6 as SW and 9 as OUT, so what are there functions?
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Old 13th December 2012, 10:49 PM   #28
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Thanks Perry, I decided against it, lol.. Frustrating. I may strip it back down, go through it again.
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Old 14th December 2012, 09:20 AM   #29
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SW is the control terminal for the class D circuit. When near the positive rail, the driver board is disabled. When the voltage on the SW pin is near ground, the driver board is enables.

The OUT pin connects to the source of the high-side FETs and the drain of the low-side FETs. This is where you will see rail-rail oscillation on the output transistors.
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Old 15th December 2012, 01:03 PM   #30
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Ah, ok, thanks Perry. So is the OUT used for feedback or sensing purposes to prevent oscillation?

Had to keep the work queue flowing; came back to this amp this morning.
Pulled outputs.
Checked rails.
Pos rail approx 68 volts.
Neg rail approx -200 and offscale peaks.

LOL..

I think this might be related...
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