[scratje]

Back again,

Rotating the main board is succesfull with less hissing now. The signal wires and dc wires are mostly seperated and twisted and where not they are aligned perpendicular to eachother. The 50/60Hz hum from the subwoofer driver is still there but i have made a red copper shield which will cover one side of the preamp board and by holding it in front and connecting to the chassis, the 50/60Hz humming from the subwoofer driver almost disappeared.
First pic is the original board and second pic is the other Z5500 with rotated board.
Pic from assembled red copper shield will follow soon.

Happy modding

 

[Galimero]

Back again,

Rotating the main board is succesfull with less hissing now. The signal wires and dc wires are mostly seperated and twisted and where not they are aligned perpendicular to eachother. The 50/60Hz hum from the subwoofer driver is still there but i have made a red copper shield whitch will cover one side of the preamp board and by holding it in front and connecting to the chassis, the 50/60Hz humming from the subwoofer driver almost disappeared.
First pic is the original board and second pic is the other Z5500 with rotated board.
Pic from assembled red copper shield will follow sone.

Happy modding

Woah, very nice to see that you are able to remove the humming. Keep it up m8!

 

[scratje]

Back again,

Today i made a cylindrical 1.5mm steel cover to shield the magnetic field coming from the toroidal transformer and it works perfectly! No matter how close the toroid is to the pcb, there is no noticable 50/60Hz humming.
The red copper schield is installed now also and blocks all radio interference from entering the preamp board.
At boost 11 volume and bass at max, there is very little hiss or humm detectible.
All this is still experimental and has to be installed in my already full modded system but for now i am very pleased with the results so far!

Have fun modding

 

[Peppie1980]

Wow! very impressed

 

[scratje]

Hi all,

Today i installed the copper shield in my fully modded system and it works great!
Then i started experimenting with the steel shield for the toroid but while doing so and with loosening the toroid i discovered that by turning it clockwise or counterclockwise, i could change the 50/60 Hz humming to very little and the same as with the steel shield.
There is a sweet spot where the magnetic field is causing the least hum so you should try out for yourself.
I now don't need the metal shield anymore!

Enjoy modding

 

[Rama Chandra]

Done in style as always scratje.

I'm wisiting the house of my relative next week. His Z5500 what I had modified first, a good while ago. I plan to do some small further upgrade. It may not do much, but I will report back if it worth the effort.

Cheers

 

[scratje]

Hey Ramachandra, welcome back again

 

[Vladdos]

In the pre amp do I need 0.22uf capacitors or 0.47uf capacitors ? A bit confused.

 

[squish72]

So I had one of these in the closet and decided I'd use it as a powered sub in my work out room. After running audyssy and doing some measurements with rew, I found a big drop off around 30hz. Is there a subsonic filter in the amp? I have it running from the sub out of my 818 Onkyo into the sub input of the pod.

 

[lotec25]

Hello,

So I have the newer model Z-5500 with no OpAmps in the sub and I have a problem. I upgraded the op amps in the control pod and I had no audio to the front or rear. Center channel worked. One of the op amps was backwards upon checking, I flipped it around and the rear surround speakers started working. But I can't get the Front Left/Right to work. Every speaker works minus Front left/right. Does anyone know what op amps control the front speakers? There is zero sound coming out of them. I do have enough to replace the op amps again but i really do not want to waste op amps I don't need to. If you need any information please let me know

Thanks

 

[scratje]

Did you have sound on all speakers before replacing the opamps?
Is there no sound on front speakers on all inputs? Try the optical and/or coax inputs.
As far as i know, all the Z5500 have opamps in the sub. On newer systems they are on the mainboard in the sub and for older systems they are on the smaller preamp board.
A few pictures from your system mainboard in the sub and the new opamps in the pod would make things more easy to diagnose and what system you have.
It could be faulty soldering/placement/overheating while soldering/broken solder pads....... hard to tell without measuring/visual inspection.

Not sure which opamps control the front speakers but the three on the picture are for the analogue inputs and the one with the red circle would be the one for the front speakers.

Newer systen with opamps on mainboard

Older system with opamps on preamp board

 

[lotec25]

So I think i fried one of the Opamps on my old pod. I got some new ones ordered. But i got a new pod for now, But none of the surround sound works. I get audio from Stereo and Stereo x2. But the others ones, Music and Movies i get no sound. I also get no sound if i do the pink noise. Anyone have any idea what is causing this? Do I ned a certain revision of the pod? My new pod says R108 on the stand in the back if that matters.

EDIT: got my original pod working now, there were a few things wrong with it. Thanks for the pictures scratje

Thanks

 

[lotec25]

@scratje
Can you show me the other side of this board with the caps replaced please? Just want to make sure i'm getting all the parts i need to replace them.

Disregard, I found what I was looking for.

 

[scratje]

Pods are a gamble to fit your system. As far as i know there are three types of Z5500 with its own type of pods. The oldest types go from 000? to pid nr R199 and have rca plugs on the backside of the sub, then there are the pid nr R200-R635 for the systems with the opamps on the small preamp board (see my pictures) and the newer systems have pid nr above R635. Normally you can not interchange these pods on all systems because the wirering is different.

rca type sub

 

[lotec25]

I have the opAmps on the preamp board on my set. I've upgraded all the opamps on the Pod and the preamp board to OPA1612AID. All the Caps in the Pod have been upgraded minus the electrolytic surface mount caps, and the 3 big caps on the sub main board have been upgraded. Need to finish up the cap upgrades on the subs main board and preamp board. And trying to decide if I should upgrade the sub in the box, or add another sub through a custom RCA out board inside the sub.

As far as the new Pod, can I just rewire the new Pods cable to match my old Pod? Or is there a lot more involved to get it working?

Thanks