diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Car Audio (http://www.diyaudio.com/forums/car-audio/)
-   -   cresendo 2k (http://www.diyaudio.com/forums/car-audio/225433-cresendo-2k.html)

timwebb 11th December 2012 12:59 AM

cresendo 2k
 
im repairing one of these that failed wile it was strapped. its not in protect but in slave mode there is 5v dc at the speaker. there isnt any current draw. what could it be?

Perry Babin 11th December 2012 01:08 AM

Does this amp use TL074s or TL072s in the audio circuit?

timwebb 11th December 2012 01:23 AM

tl074s.

Perry Babin 11th December 2012 01:36 AM

Post the DC voltage on all pins of IC103.

IC103
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:

timwebb 11th December 2012 02:10 AM

IC103
Pin 1: 14.41
Pin 2: 7.25
Pin 3: 0.81
Pin 4: 15.23
Pin 5: 0.0
Pin 6: 0.0
Pin 7: 0.0
Pin 8: 0.0
Pin 9: 0.0
Pin 10: 0.0
Pin 11: -14.93
Pin 12: 0.0
Pin 13: -14.75
Pin 14:-14.69

Perry Babin 11th December 2012 02:12 AM

It appears to be defective. With the input voltage on pins 2 and 3, pin 1 should be near the negative regulated rail, not the positive.


All times are GMT. The time now is 08:43 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2