friends amp start to cut and went mute with out smoke, doesnt power up.
Schematics anyone? tried search and didnt found similar thread
gnd b+ connected this draws 0.15amps.
quick measure in circuit there is some difference between q115 q119 q215 q219 and q6 q7. r19 r20 difference as well.
cut legs from those q´s and measure off circuit?
quick measure in circuit there is some difference between q115 q119 q215 q219 and q6 q7. r19 r20 difference as well.
cut legs from those q´s and measure off circuit?
that r19 is broken, schematics says r19 r20 to be 68ohms but they are 100ohm on board, replace it with 100ohm?
The value of R19 and R20 will be determined by the PS FETs you use.
Don't cut the output transistors. What difference do you read on those transistors?
Don't cut the output transistors. What difference do you read on those transistors?
OK. The two PS FETs will need to be replaced. I'd use the IRF3205 and 47 ohm gate resistors. The drivers have likely survived but you should check the drive signal before installing the FETs.
Q119 and Q115 will need to be replaced and if their source resistors are out of tolerance, they will need to be replaced. You may have to get the PS working before you can determine if there is more damage in the output section.
Q119 and Q115 will need to be replaced and if their source resistors are out of tolerance, they will need to be replaced. You may have to get the PS working before you can determine if there is more damage in the output section.
https://4donline.ihs.com/images/Vip...2-1.pdf?hkey=6D3A4C79FDBF58556ACFDE234799DDF0
so this with 47ohms to r19 r20, hook these on before installing q115 119 215 219.
R150 152 250 252 are all 9.9ohms
what do you recommend to output section, im changing them all
so this with 47ohms to r19 r20, hook these on before installing q115 119 215 219.
R150 152 250 252 are all 9.9ohms
what do you recommend to output section, im changing them all
Use the same output transistors as are in the amp now.
The source resistors are the large resistors connected to the source legs of the output FETs.
Do you have the 47 ohm resistors on hand or would you have to order?
The source resistors are the large resistors connected to the source legs of the output FETs.
Do you have the 47 ohm resistors on hand or would you have to order?
When you order parts, order some (10 each? they're cheap) MMBTA06 and MMBTA56 transistors (may or may not be needed) and a 0.01uF film capacitor.
It's not on the diagram. It's going to be used as a loading capacitor to test the drive. It's not absolutely necessary.
rf 250m2 case i had i actually got mmbta06 and mmbt3906 left overs
I don't watch repair videos because I produce a similar content (in a different format) and don't want anyone to claim I stole their material.