Help repair Rockford 1001bd

[josesony68]

Hi, I have 1problema in the repair of the stage, I let a friend, and I returned it burned ... I changed the following parts: feeding 8mosfet (from Q5 to Q12) 6mosfet output (Q104 to Q106 and Q110 to Q112) associated with resistance MOSFET supply (R84, R100, etc.), the U14, the U21, Q17 , Q19, Q20, Q21, Q120, D25 and finally R21 ... when connected, nothing happens, nothing works, nothing is heated, there is high tension in the wire strands, one is 13v positive and negative, respectively, with respect to ground, any ideas? appreciate it greatly.

[Perry Babin]

Precisely, where did you measure the ±13v?

If you don't have at least 70v DC across the red and black twisted pair of wires, post the DC voltage on the SG3526. Place the black meter probe on the amplifier's ground terminal. Place the red meter probe on the point where you need to measure the voltage. Copy and paste this list into your reply.


Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
Pin 17:
Pin 18:

[josesony68]

Hi Perry, thanks for treat me well, 13voltios, v 12.8 or 13.2 are not exactly 13v, are what give me a car battery, which is what I have to prove it. This voltage gives it to me putting the probe tester negative, mass of the stage and the positive lead to the red wire HV + stage, then I get +13 v and if I put the same positive lead to the black wire HV-then I da-13v. when I try with both ends of the tester directly on the HV + and HV-, me da v. 0.05 No current rail I have no point of the plate ... As you can control the tension on the pins of the UC3526. A greeting.

[josesony68]

forgiveness, perry, the measurement that I have commented before on the red and black wires on the stage were the tip of the positive test, the positive stage, and always gave me positive volts. (between the red wire and black is 0v.) I have already tensions: pin1:4,95 pin2:0 pin3:4,21 pin4:4,63 pin5:4,96 pin6:0 pin7:0 pin8:4,54 pin9:3,63 pin10:4,25 pin11:0 pin12:4,03 pin13:0 pin14:11,38 pin15:0 pin16:0 pin17:11,38 pin18:4,95

[josesony68]

Pin 1: 4,95
Pin 2: 0
Pin 3: 4,21
Pin 4: 4,63
Pin 5: 4,96
Pin 6: 0
Pin 7: 0
Pin 8: 4,54
Pin 9: 3,63
Pin 10: 4,25
Pin 11: 0
Pin 12: 4,03
Pin 13: 0
Pin 14: 11,38
Pin 15: 0
Pin 16: 0
Pin 17: 11,38
Pin 18:4,95

[Perry Babin]

Remove R34 from the circuit. Does the amp power up?

Be careful, the amp may draw excessive current. Have all transistors clamped to the heatsink and insert a 15 amp fuse in the B+ line.

[josesony68]

Hi Perry, really is so important that the chassis are connected to the drain of the mosfet? I have attached to the aluminum chassis which originally comes threaded screw to the chassis, but the mosfet encapsulated, are not in contact with the plate .... well, I've removed r34, and when connected, (2segundos only because I hear that something is burning) if I have between red and black wires 73.6 v, but turns on the LED protection, and as I said before, is heard whistle a little suspicious of any piece that will burn (I think) where I?

[josesony68]

Originally Posted by josesony68

Hi Perry, really is so important that the chassis are connected to the drain of the mosfet? I have attached to the aluminum chassis which originally comes threaded screw to the chassis, but the mosfet encapsulated, are not in contact with the plate .... well, I've removed r34, and when connected, (2segundos only because I hear that something is burning) if I have between red and black wires 73.6 v, but turns on the LED protection, and as I said before, is heard whistle a little suspicious of any piece that will burn (I think) where I?

(I always test the stage with a fuse 20a)

[Perry Babin]

Post the DC voltage on all legs of U21. Place the black meter probe on the amplifier's ground terminal. Place the red meter probe on the point where you need to measure the voltage.

U21
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:

[josesony68]

U21
Pin 1: -8,52
Pin 2: 7,94
Pin 3: -9,05
Pin 4: -9,93
Pin 5: 4,98
Pin 6: from 4 up to 7.05
Pin 7: -8,55
Pin 8: 9,90