Any body have board schematic for Rockford Fosgate 800a2?

[rockfordfanatiq]

The driver transistors are still heating up without b+ applied

 

[Perry Babin]

What are the markings on the transistors you have installed in Q1-4?

 

[rockfordfanatiq]

Q3 and Q2 have w2g with 74 stamped sideways, mouser #pmbta56
Q1 and Q4 have 1gm with a sideways p, mouser# 3mmbta06lt3g

 

[rockfordfanatiq]

I'm thinking I may have screwed up when I ordered Q3 & Q2? Looks like its supposed to be mouser part#PMBTA56,235?

 

[rockfordfanatiq]

should i order the mouser part#PMBTA56,235 and start over ?

 

[Perry Babin]

Is the resistance between legs 1-2, 1-3, 2-3 the same for all power supply FETs?

 

[rockfordfanatiq]

1-2 1-3 2-3
Q15 431.6 423.0 469.7
Q16 1.006mohms 430.7 .697m ohms
Q17 470+ kept rising 430.7 466.2
Q18 kept rising slowly on 2-3 and 1-2 1-3 was415.8

 

[rockfordfanatiq]

I would have to think those fets are shorted out. On the other side of the board the fets from 1-2 are like .05 ohm then 1-3 and 2-3 are the same number. I’m going to try changing out the ones mentioned in the above comment.

 

[Perry Babin]

0.05 would definitely be shorted.

 

[rockfordfanatiq]

that would be the side that doesnt get warm at all upon power up.

 

[rockfordfanatiq]

Q33, Q34, Q35, Q36, none of them 4 get warm when powered up. Should i just go ahead and replace all of them on both sides of the board?

 

[Perry Babin]

Post photos of the markings on both sides of the board. The transistor numbers don't match anything I have.

 

[rockfordfanatiq]

I apologize, I have been away from the computer for the last week just about. I will get you some photos hopefully tomorrow.