1

CP4500 Stereo Bus Compressor / Re: Setup Help THRESHOLD potentiometer counter clockwise reduces the out ?

« on: March 24, 2021, 07:19:29 AM »

I have a feeling it could be the IC's, I've ordered some new ones 

2

CP4500 Stereo Bus Compressor / Re: Setup Help THRESHOLD potentiometer counter clockwise reduces the out ?

« on: March 24, 2021, 07:05:24 AM »

On which test step? AC or DC? DC 

3

CP4500 Stereo Bus Compressor / Re: Setup Help THRESHOLD potentiometer counter clockwise reduces the out ?

« on: March 22, 2021, 05:43:29 PM »

TP 4 has voltage passing through 14.94
TP 13 stays on -14.6

4

CP4500 Stereo Bus Compressor / Re: Press the IN switch and check that the front panel LED and meter light up . help

« on: March 22, 2021, 12:58:22 PM »

I had 2 lifted pads on D3 problem is now solved 

Thank you 

5

CP4500 Stereo Bus Compressor / Setup Help THRESHOLD potentiometer counter clockwise reduces the out ?

« on: March 22, 2021, 07:21:46 AM »

Adjust the signal amplitude from the DAW in order to read 3.0 VAC on the DMM. Done

Check that turning the THRESHOLD potentiometer counter clockwise reduces the output level.  level doesn't reduce ? 

Check that turning the MAKEUP potentiometer clockwise increases the output level. Makeup gain works fine. 


Adjust trimmer T1 in order to get absolutely no output level change when switching on and off with the IN switch. Done

6

CP4500 Stereo Bus Compressor / Re: Press the IN switch and check that the front panel LED and meter light up . help

« on: March 08, 2021, 04:45:12 PM »

Yes there is a short circuit when the in is off. 

7

CP4500 Stereo Bus Compressor / Re: Press the IN switch and check that the front panel LED and meter light up . help

« on: February 17, 2021, 07:31:27 AM »

It seems the short is on PCB C.
Check between the 2 center pins of CN4 when the meter and PCB A are disconnected.

Yes, there is a short circuit ?

8

CP4500 Stereo Bus Compressor / Re: Press the IN switch and check that the front panel LED and meter light up . help

« on: February 12, 2021, 09:21:30 AM »

- Remove the IC's until this is sorted out. Done
- Check the meter (unplugged): 600 ohms between the large terminals, infinite resistance between any 2 other terminals. 562 ohms large infinite resistance between any 2 other terminals.  Short Circuit Small terminals when connected to PCB C 
- Check the relay coil (in circuit), 2800 ohms across D19 (check D19 direction). 2.73
- Check R104 value (in circuit). .217

9

CP4500 Stereo Bus Compressor / Re: Press the IN switch and check that the front panel LED and meter light up . help

« on: February 10, 2021, 11:37:46 AM »

No there is no short circuits and everything is connected as you said. when I probe CN4, the meter moves on everything apart from the red and on D3, k lights up and long shoots to 20DB, if this info is any good to you.

10

CP4500 Stereo Bus Compressor / Re: Press the IN switch and check that the front panel LED and meter light up . help

« on: February 10, 2021, 10:04:41 AM »

Apologies, 

Didn't have any power running through it. I've done another test and there is a sort circuit when the probe is on V+ and touching +12v All the other TP are fine.

11

CP4500 Stereo Bus Compressor / Re: Press the IN switch and check that the front panel LED and meter light up . help

« on: February 09, 2021, 05:54:05 PM »

Thank you, no there is no short circuits 

12

CP4500 Stereo Bus Compressor / Re: Press the IN switch and check that the front panel LED and meter light up . help

« on: February 09, 2021, 05:09:54 PM »

Sorry could you please explain in detail how to do that, I'm a novice and completely out of my depth. 

13

CP4500 Stereo Bus Compressor / Re: Press the IN switch and check that the front panel LED and meter light up . help

« on: February 09, 2021, 04:11:35 PM »

also the Led lights up really bright ?

14

CP4500 Stereo Bus Compressor / Press the IN switch and check that the front panel LED and meter light up . help

« on: February 09, 2021, 04:04:01 PM »

Hi, 

In switch lights up, but meter dosent and shoots up past 20db? 

all voltage is correct in the first steps.