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Build help and troubleshooting => EQ573 Equaliser => Topic started by: Hagar on March 27, 2025, 04:56:04 PM

Title: 573 there's no audio signal when I select XLR.
Post by: Hagar on March 27, 2025, 04:56:04 PM

[color=var(--YLNNHc)]Hello
On the 573, there's no audio signal when I select XLR. 
VVcc voltages: V1 pin 8: +15vcc.    pin 4 -15 vcc
VTHAT 1646. pin 5 -15 vccpin 6 +15 vcc
QQ1:   13 vcc Colector  -10 vcc Base  -10 vcc Emisor
Q4: -0,8 vcc Colector. 7,46 vcc Base  -8 vcc Emisor
C78 tantalio pin + 9,5 vcc pin - -9,5 vcc
CC 86. ".        Pin + 7,5 vcc. Pin - -10 vcc
R25 -10vcc
Tip 1 -10 vcc 
Tip 3 -10 vcc[/color]

Title: Re: 573 there's no audio signal when I select XLR.
Post by: JPK on March 28, 2025, 10:58:19 AM

What is the revision number of the EQ573 PCB?

Title: Re: 573 there's no audio signal when I select XLR.
Post by: Hagar on March 28, 2025, 06:23:14 PM

Hello
Rev 1.3

Title: Re: 573 there's no audio signal when I select XLR.
Post by: Hagar on March 28, 2025, 06:46:30 PM

The audio Signal reaches the output, but very small.

Title: Re: 573 there's no audio signal when I select XLR.
Post by: JPK on March 31, 2025, 07:23:53 PM

Please report the DC voltages shawn in this post, against TP4.
https://www.soundskulptor.com/forum/index.php?topic=25.msg41#msg41