absolutely no sounds at all even when u connect the speaker while the unit is on
i can press any button on the unit but nothing happens ,no sounds no buzz
sound source is 100 % good i tested i know good amp and sound comes out
plugging the rca after the unit is on docent change nothing -no noice no change
i can press any button on the unit but nothing happens ,no sounds no buzz
sound source is 100 % good i tested i know good amp and sound comes out
plugging the rca after the unit is on docent change nothing -no noice no change
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What is the DC voltage on the terminals on each end of the driver boards?
Are you sure that the speaker is good?
Are you sure that the speaker is good?
Drive a test tone of 50-100Hz into the amp. Set the crossovers to off/flat, set the gain to the highest setting. Set the -12dB switch to off (if it has one). What is the AC (not DC) voltage on pins 3 and 4 of the driver boards?
Place the black probe on one of the non-bridging speaker terminals when measuring the voltage.
Place the black probe on one of the non-bridging speaker terminals when measuring the voltage.
using tone generator for pc i did drive 100hz sine frequency acv on the pin 3 is 7-8
on pin 4 is 8v as well .if i move the black probe to the other non bridging terminal voltage reading is 4-5 volts on both legs
on pin 4 is 8v as well .if i move the black probe to the other non bridging terminal voltage reading is 4-5 volts on both legs
No matter which of the two non-bridging terminals you use, the voltage should be the same.
If you measure the AC voltage on the speaker terminals for each channel inside the amp, do you read any voltage?
If you measure the AC voltage on the speaker terminals for each channel inside the amp, do you read any voltage?
Looking at the image (link) below, measure the resistance for probe positions A and B on each driver board (no power applied). What's the resistance?
Well... it's just a bit farther below than originally planned.
http://www.bcae1.com/temp/ppidriverboardresistoroverlay01.swf
http://www.bcae1.com/temp/ppidriverboardresistoroverlay01.swf
ok here they are
a test 8.16kohms
b test 2.23kohms
the other driver board
a test 8.1 k ohms
b test 2.3 k ohms
a test 8.16kohms
b test 2.23kohms
the other driver board
a test 8.1 k ohms
b test 2.3 k ohms
Those all appear bad. They should all read ~100 ohms. I'd suggest that you solder two 100 ohm leaded resistors from point to point as shown on the diagram. Do it on one driver board and watch very carefully as you power the amp up. If either resistor begins to overheat, immediately disconnect the amp.
while soldering the 100 ohm resistor in test A the transistor fell off the board and i was able to clearly see the damage under it where the trace is no good .i have no connection now and I'm thinking the other driver board is the same story.shouldn't i just look for replacements ,even tho they are pricey
If soldering to one leg made the transistor fall off, the driver boards are likely badly damaged. If you shine a bright light from the back of the board and examine the solder connections, there should be no light getting through the trace near the solder connection. If you can see light through multiple connections, the boards are not likely practical to repair.
The replacement boards are $30 from Robot Underground. If you can find them for less, post the link.
The replacement boards are $30 from Robot Underground. If you can find them for less, post the link.
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