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Search: Posts Made By: R_J
Forum: Troubleshooting Audio Equipment 09-30-2020, 10:23 AM
Replies: 28
Views: 992
Posted By R_J
Re: troubleshooting definitive technology prosub 60

If the drive to the mosfets is bad, then the mosfets will be turned on, when they are turned on they will act as a short. If the circuit is working, the mosfets will be turned OFF and only turn on...
Forum: Troubleshooting Audio Equipment 09-27-2020, 10:17 PM
Replies: 28
Views: 992
Posted By R_J
Re: troubleshooting definitive technology prosub 60

R7 is a ntc thermistor, it gets hot and the resistance goes down, thats how it works. it will not be the problem. The cold temperature is 20Ω It is just for inrush protection. they can fail open but...
Forum: Troubleshooting Audio Equipment 09-27-2020, 10:31 AM
Replies: 28
Views: 992
Posted By R_J
Re: troubleshooting definitive technology prosub 60

If you have a variac, that would work the best so you could increase the a/c voltage slowly. If you don't have one then you can use a lamp, but the wattage of the lamp is not that critical. It is NOT...
Forum: Troubleshooting Audio Equipment 09-26-2020, 09:14 PM
Replies: 28
Views: 992
Posted By R_J
Re: troubleshooting definitive technology prosub 60

You can use a 60~100 watt incandescent lamp in series with the a/c input, this will limit the current and may help prevent the amp from blowing up during troubleshooting.
Forum: Troubleshooting Audio Equipment 09-26-2020, 07:48 PM
Replies: 28
Views: 992
Posted By R_J
Re: troubleshooting definitive technology prosub 60

If Q1 & Q7 were shorted and R19 open, it is very likely the gate drive circuit is also damaged, Z1, Z4, R1, R18, Q3, Q4, Q5 etc. Z1&z4 are zener diodes and may check like a diode but zener at the...
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