Mackie CR1604 Schematics

[welhamm]

Hi

I'm currently attempting to repair an old Mackie CR1604 (not VLZ) mixer which has issues with the main outputs (no Left output). The only workaround to this is to use the Solo output to the monitors. I've also noticed the BNC 12V output is dead.

Does anyone have the schematics for this unit handy? The only ones I can find are for the VLZ version

Thanks in advance!

 

[scott2000]

Hi

I'm currently attempting to repair an old Mackie CR1604 (not VLZ) mixer which has issues with the main outputs (no Left output). The only workaround to this is to use the Solo output to the monitors. I've also noticed the BNC 12V output is dead.

Does anyone have the schematics for this unit handy? The only ones I can find are for the VLZ version

Thanks in advance!

If you go to Mackie website.....  Schematics-mixers-classic........it looks to be there????

 

[metalb00b00]

Here ya go.

https://elektrotanya.com/mackie_cr1604_mixer.rar/download.html

 

[jekapéli]

Hi

I'm currently attempting to repair an old Mackie CR1604 (not VLZ) mixer which has issues with the main outputs (no Left output). The only workaround to this is to use the Solo output to the monitors. I've also noticed the BNC 12V output is dead.

Does anyone have the schematics for this unit handy? The only ones I can find are for the VLZ version

Thanks in advance!

Hi! I know you posted this 7 years ago, but I just got my hands an a mint condition (cosmetically at least) original Mackie CR-1604 and I'm having the same issue as you, no left output. I was wondering if you solved the issue and what the problem was. Seems like it could be a common thing, or just an odd coincidence.

Thanks,

Jed

 

[JohnRoberts]

Hi! I know you posted this 7 years ago, but I just got my hands an a mint condition (cosmetically at least) original Mackie CR-1604 and I'm having the same issue as you, no left output. I was wondering if you solved the issue and what the problem was. Seems like it could be a common thing, or just an odd coincidence.

Thanks,

Jed

He has not been online since 2017 so don't expect him to respond.

JR

 

[jekapéli]

He has not been online since 2017 so don't expect him to respond.

JR

Thank You!

 

[fazer]

It’s probably old caps that have dried up. The powersupplycaps were bad on mine and the phantom was noisy. Also some coupling caps in the output section were bad. The switches/pots need cleaned , and you may need to reseat/clean some ribbon cable connectors. I did this last year and it fixed everything.

 

[jekapéli]

It’s probably old caps that have dried up. The powersupplycaps were bad on mine and the phantom was noisy. Also some coupling caps in the output section were bad. The switches/pots need cleaned , and you may need to reseat/clean some ribbon cable connectors. I did this last year and it fixed everything.

Thanks Fazer, that sounds about right... I did a thorough test last night and the left bus insert point does work (it feeds the left output) so the problem must be before that point on the circuit board. Setting up a table where this thing (and all of it's screws) can live for a week or so

 

[Brian Roth]

I use an empty Altoids tin for storage of screws during a teardown.

Bri

 

[Somkereki]

Never trust electrolytic capacitors! I am already 70 years old, electrical engineer and sound engineer (retired, but I can't stop because it's also my hobby.) This week I repaired the JBL system processor of one of our theaters in Budapest. All the electrolytic capacitors in the switching power supply were faulty! In addition, it operated at 49 kHz, so it could interfere with the sampling frequency. I put 2 x 470 nF ceramic SMD capacitors (with X7R dielectric) in parallel with each replaced electrolytic capacitor. The supply voltages became perfectly noiseless. A friend's Quad 66 preamplifier had 22uF bipolar electrolytic capacitors as the couplers in the audio path. Measured with a square signal, there was a large amount of "ringing" at the edges of the signal. I put 680 nF polypropylene inductance-free capacitors in parallel with them, it turned out perfect. The phase error at 20 kHz decreased from 48 degrees to 14 degrees! After listening to it, it sounded much better.