amp ESX quantum Q602 module driver unknown!

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ESC quantum Q602 module driver unknown!

the 2 outputs speaker works but


the QA7 irf640 burns intantanemant

measures:

vacuum amps consumes 1.79 amperes

QA7 irf640: 1 -27.36 volt dc 2: zero volt dc 3 -36.17 volt dc

QB7 irf640 1 -36.17 volt dc 2 zero volt 3 -36.04 volt dc


on the unknown module:

next to irf640 burn

Q23 bipolar 2222: 1 8.94 volt dc 2 9.39 volt dc 3 9.04 volt dc

Q24 bipolar 2222: 1 8.49 volt dc 2 8.94 volt dc 3 90.4 volt dc

q25 bipolar 2907A 1 8.49 volt dc 2 9.39 volt dc 3 -9.09 volt dc

on unknown module:

next to the irf 640 fontionnel

q23 bipolar 2222a: 1 0.85 volt dc 2 0.75 volt 3 9.04 volt dc

q24 bipolar 2222a: 1: 0.94 volt dc 2 0.87 volt dc 3 9.04 volt dc

q25 bipolar 2907a 1 0.44 volt dc 2 0.77 volt dc 3 -9.08 volt dc
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schéma

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no info on this mysterious card MOSFET driver 😕

 

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the manufacturer of the card: DLOGIXS

 

[Perry Babin]

Have you pulled the outputs from the half that's blowing them to look at the drive signals?

 

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i have unsolder and check:
the 3 transistors on the left then
the 3 transistors on the right of the Dlogixs board
they are good

I will measure the small card in the center with black epoxy glue
there is a big difference of input signal

 

[Perry Babin]

Don't try to remove the black epoxy. It will likely destroy the semiconductor under it.

 

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thanks Perry Babin for your help!

I'm not going to touch the black epoxy just make measurements by injecting a signal 20hz 80 milivolt and follow the signal

 

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here are the measurements with a signal 30 Hz 80 millivolt on rca
amp on 12.7Volt 1.7 amperes
speaker output 1.7 volt 30Hz
see photo attached

I also made the measurements on connector down left




1: 41.4 milivolt DC
2 Si: 89 milivolt 30Hz
3 +45: + 31.30 Volt DC
4 -45: - 31.40 volts DC
5 G: 47 milivolt Dc
6 +10: +9.05 volt Dc
7 -10: -9.07 volts dc

the right connector has the same value

I'm going to measure the 6 transistors: q23 q24 and q25 right and left

 

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I removed the 6 q23 q24 q25
the amp works without!
B + 12volt 4.01 ampere
signal 30Hz 32 milivolt at the RCA
output hp 2.77 volt 30Hz
the amp is warm for 3 hours

measurement on empty slot: black probe on RCA shield
to the left
q23:
1: 2.82v 100hz
2: 9.36v dc
3: 9.01 vdc
q24:
1: 40milivolt 60hz
2: 3.35volt 100hz
3: 9.01volt dc
q25:
1: 40milivolt 60hz
2: 9.36 volts dc
3: -9.12 volts dc

to the right
q23:
1: 1.95volt 100hz
2: 9.36 volts dc
3: 9.01volt dc
q24:
1: 42milivolt 60hz
2: 3.02 volt 100hz
3: 2.01 volt dc
q25:
1: 42 milivolt 60hz
2: 9.35 volts dc
3: - 9.12 volt dc

i also measured voltage and frequency from b3 to b7 and a3 to a7

if you are interested ?

 

[Perry Babin]

Did you try installing 3 for one side or the other (not both) to see if you could narrow down the problem area?

 

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ok i'm going to mount 3 transistors and see that

 

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I resolder: q23 q24 q25 right
the amp is working normally
measurement on QB7: irf640n
1: -34 volt dc
2: 2.0 volt 8.9Khz !!!!
3: -35.11
still strange the amp works with fewer components?
it misses on the left QA7, q23, q24, q25!

 

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I changed by new q23 q24 q25 left channel

a new irf640 the amp goes into red LED protection !!

without the irf650 the amp works normally?

 

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when removes q23 q24 q25 from the right
the fuse 10 amperes burns!

when I go up q23 q24 q25 right

the amp works normally!

 

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i have found a newer module dlogics AD100W for an ESX amp of the same series

with the same failure