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Bass face sq 1.1 dsp repair
Bass face sq 1.1 dsp repair
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Old 8th December 2018, 06:01 PM   #1
Jakobsson is offline Jakobsson  Sweden
diyAudio Member
Join Date: Apr 2009
Default Bass face sq 1.1 dsp repair

The main amp powersupply is working and if i bypass dsp board amplifier is working.
input signal is not passing dsp board and i have done measurements on the dsp board.
+/- 20v works and 5volt pwm step down works but 1.2v and 3.3v missing.
1.2v and 3.3v feeds the dsp part so if i try to communicate from pc the only thing working is the usb to serial chip (prolific).
My ideas are a defective dual pwm regulator or shortcircuit after regulator maybe capacitor shorted.
Any ideas of how to test regulator?
My idea was to lift the legs from the inductors but im not sure.
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