Rockford Punch 60X2 trans.ana

[DaddoDenon]

Good evening everyone
I wanted to know if anyone can help me with a Rockford Punch 60.2 trans.ana, I would need the diagram to know what model of diode is fitted on d2 and d3 as well as to be able to repair it

 

[Perry Babin]

See attached.

I don't reinstall/replace these when they fail. If you feel better replacing them, it can wait. The amp will work perfectly without them.

Did the PS FETs fail?

 

[DaddoDenon]

Thank you very much, I'll have a check, because it doesn't power at all and I replaced the entire power supply part that was shorted, feeding it with a laboratory power supply, as soon as I give positive to the REM the milliamp meter rises by 200mah but not even the red LED lights up

 

[Perry Babin]

What test equipment do you have?

 

[DaddoDenon]

I have a Tektronix 2221A osciloscope and Fluke model 45 multimeter

 

[Perry Babin]

With only remote and ground connected, do you see a drive signal on the gate legs of the PS FETs?

Did any of the heatsink-mounted FETs short?

 

[DaddoDenon]

No shorted fets, they are all new just replaced , no drive signal on gate pins of PS FETs

 

[Perry Babin]

DCV on pins 3, 4, 12 and 14 of the 494?

 

[DaddoDenon]

always feeding negative and rem only?

 

[DaddoDenon]

feeding negative and rem, I have 12 volts only on pin 12, the other pins seem to have nothing

 

[Perry Babin]

If you have 12v on pin 12, you should also have 12v on pins 8 and 11.

Are you sure you were making good contact with both probes?

 

[DaddoDenon]

I haven't tried on pins 8 and 11, only pin 3,4,12,14, I'll do the same thing tomorrow on other as soon as I get back, do you think the 494 could be damaged?

 

[Perry Babin]

If the IC has 12v on 12 and 0v on pin 7 (ground), pin 14 should have 5v. If it doesn't the IC is likely defective. The exception would be where something is shorting pin 14 (or anything connected to it) to ground (rare/never).

 

[DaddoDenon]

Ok, everything is clear, then I just have to be sure that I also have 12v on pins 8 and 11, if so and I don't have 5 volts on the 14th ic, I think it's faulty..
Thank you very much for your availability, I'll test everything carefully tomorrow

 

[DaddoDenon]

Hello
I checked and confirm: on pin 12-8-11 I have 12 volts, on pin 14 I have nothing

 

[Perry Babin]

Lift pin 14 to see if 5v returns to the pin. Do NOT connect B+ with that terminal lifted unless you lift 13 as well and solder them together.

 

[DaddoDenon]

Hello if i lift the 14 pins and returns 5 volt :O

 

[Perry Babin]

With no power applied, what resistance do you read from the solder pad for pin 14 to pin 7?

Do you have any 1k ohm resistors on hand?

 

[DaddoDenon]

Maybe, i have to check where should I use it?

 

[Perry Babin]

You would insert it into the circuit between the solder pad for pin 14 and pin 14. It doesn't have to be 1k. Anything near that (preferably higher if no 1k) will likely serve the purpose.

The resistance you read may eliminate the need for the resistor.