I would like the part numbers of blown resistors I think they are 4.7ohms but diodes D8 & D10. IC9 & IC14
With pins 4 and 5 bridged, this IC9 has to be an IRS20957. The other others would be a 2092 or an SI8244 and it can't be those with 4/5 shorted.
IC14 ZXGD3005E6
Diodes D8 and D10 MURA120
Contact B2 audio and ask for the B2 Audio Riot 8000.1 diagram.
IC14 ZXGD3005E6
Diodes D8 and D10 MURA120
Contact B2 audio and ask for the B2 Audio Riot 8000.1 diagram.
D8 & D10 Mr Babin is the glass diodes .5 watts (MELF) I presume, those are the ones I’m making enquiries about, and for the gate D29….?
D21 is T4 (parallel with 10ohms resistor)
D21 is T4 (parallel with 10ohms resistor)
Ok, looking at a different circuit, the drivers with the input to pin 6 are UCC27511.
The gate circuits are all very similar for this type amplifier. 15v Zener across the gate and source and a 1N4148 type parallel to a 10-15 ohm gate resistor.
Does the diode in question (D10) have any terminal connected directly to the 20957?
The burned resistors are typically 1-10 ohms. If you can read a 4, 4.7 is a good assumption.
What am I missing?
The gate circuits are all very similar for this type amplifier. 15v Zener across the gate and source and a 1N4148 type parallel to a 10-15 ohm gate resistor.
Does the diode in question (D10) have any terminal connected directly to the 20957?
The burned resistors are typically 1-10 ohms. If you can read a 4, 4.7 is a good assumption.
What am I missing?
The D10 seems to be on pins 13 & 15, parallel with CD32 cap. I’m getting a short across the diodes on both symmetrical sides of all those diodes, pins or caps. I’ve already remove one of the 20957 and the short is still there I’m planning on remove diodes and buffers to see if the short is gone but I need to know the type or value diodes for the circuit.
IC 9 Is an IRS20957. The drive IC are UCC27511. The zener diodes are 15v. The burnt resistor is a 4R7. The common fault that I have with this design of amp is that if the 4R7 resistor burns out, then you have to change the Drive and those Buffer ICs.
One is not able to put this design the amp in service mode. The best way to repair this amp is to have your power supply amps set to about 1 or 2 amps and let the amp try and build rail voltage. While the rail voltage is building, you can use your scope to check the drive ic. I would suggest that while you have the one drive ic out check the other one to make sure that the drive circuit is working fine.
One is not able to put this design the amp in service mode. The best way to repair this amp is to have your power supply amps set to about 1 or 2 amps and let the amp try and build rail voltage. While the rail voltage is building, you can use your scope to check the drive ic. I would suggest that while you have the one drive ic out check the other one to make sure that the drive circuit is working fine.