Transistor Part Numbers for Q130-Q139 in a Kole PH2-3000D

[Perry Babin]

Yes. It's 40mm x 10mm.

[Perry Babin]

Mouser:
SP401012H W-G Bi-Sonic | Mouser

Digikey:
ME40101VX-000U-A99 Sunon Fans | 259-1547-ND | DigiKey

Radio Shack (only as a last resort):
273-240

[whitejohnny]

I just checked R173 and R190, (with 1 lead removed from the board) and read 560 and 1176 ohms respectively. If that doesn't sound right, please let me know. They didn't look so badly burnt that they would have drifted.

Are these (1/4,1/8,1/16) watt carbon film?

Hey, Perry - looking on page 39 of BCAE, in the resistor wattage ratings image, the resistor size on this driver card (of R173) is the one all the way on the right listed as 1/6 watt. Is 1/6 watt correct?

Thanks for the info on the fan too!

[Perry Babin]

They're OK. They are supposed to be 560 and 1.2k ohms.

They are 1/8w carbon film.

[whitejohnny]

Hey, I finally got back to this, assembled it, and tested it. Protect light is steady on. Found a lot of negative voltage on the positive speaker terminal. The gates on the first half of the output fets (which connect to the positive power rail) are getting high negative voltage. The gates on the second half (which connect to the negative power rail) are getting about zero.

BTW In this amp, the negative speaker terminal is ground right?

So I checked and found the excess negative voltage present on the driver card input, so I disconnected the input from the board and checked at the card, and still found it. So the problem might be in the card?

Looking at the connections to the DRV output pins from the card, each side has four transistors (DRV1 has 2 MPS42 (NPN) and 2 MPS56 (PNP), so does DRV2) right?

First pass with the meter and the four pairs of transistors look good.

Sleepy time again.

[Perry Babin]

Measure the DC voltage from pin 1-3 on the high-side and low-side outputs (black on pin 3) and post the voltages.

The negative speaker terminal is connected to the secondary ground.

[eyoung]

might be lights playing tricks but in post 7 , second picture the cap between r161 and r162 appears to be bulging in top, or just my afigination....

E

[whitejohnny]

Huh. Just got back to it, figured I would make the measurements Perry asked for, powered up, turned on and R173 smoked. Was running it yesterday looking for the problem with nothing happening to R173. Odd. Will check bottom for solder issues, then try again.

Any ideas why R173 would be smoking? Related?

This amp is badged Kole QX1-3000D - is it also a Planet Audio VX2200D? Looks like the same amp.

[whitejohnny]

Ok, First half (Q130 to Q134) are +0.05v between pins 1 and 3 of each output - it kicks up to +0.05 then sinks to 0. Second half, (Q135 to Q139)swings back and forth between 25 and 30 volts.

Checked the rails with neg lead on neg speaker terminal, swinging between 25 and 33 on each rail (neg on neg rail). Before was seeing -30 or so at -In of driver card (pin2 from rca end of amp) and at DRV output 1 (pin8). +In and DRV2 around 0.

Currently have 1 ouput removed on low side, that wouldn't do all this would it?

[whitejohnny]

Ok, with missing low side output in, now 1 to 3 voltages on low-half are ~0, on high half, still jumping.

If disconnect the feed to the 'gate-bus' of the low half, would that cause any damage? curious to see if the rails would stop jumping.

From rca shield/gnd to neg speaker terminal = 220 ohms.

On driver card pins from rca side of amp
1 (In+)= 0
2 (In-)= swinging negative voltage down to about 2/3 of neg rail
3 (SG)= 0
4 (+15v)= up to about +13 falls to 0 repeats
5 (-15v)= up to about -13 falls to 0 repeats
6 (SW)= swinging pos voltage up to about 2/3 of pos rail
7 (Vpp)= swinging pos voltage up to pos rail
8 (DRV1)= swinging negative voltage down to about 2/3 of neg rail
9 (OUT)= swinging negative voltage down to about 2/3 of neg rail
10 (PG)= 0
11 (DRV2)= ~0
12 (Vnn)= swinging neg voltage down to neg rail