Volume Adjust Problem on Rowe CD-100E Help?

[maldo]

Hello, trying to work on this juke for a friend. The volume will not adjust using any of the volume controll knobs as shown in the pic below. It just plays at max (or what I think is max) volume constantly. The EQ on this board also does not work, like it is being bypassed. I included a pic below to see if anyone could help. I noticed another forum post saying the add on board (shown in the bottom of the picture) can cause volume control to stop working? Is this true? If so should I remove the board ?





thank you in advance for your help.

cm

[Ken Layton]

What's with the three loose wires dangling in front of the amplifier?

Is this juke using the volume control on the back of the cabinet? Or is it using either a hardwired remote volume or a wireless infrared remote?

That circuit board on the bottom looks like a signal or speaker switcher. Does not appear to be a genuine Rowe accessory. More like an aftermarket unit.

[maldo]

There is an old hardwired rowe volume control on the wall but I am not sure it is hooked up as it does not work and there are no wires going into the machine from there, also not sure on what is up with the 2 dangling wires int he pic, was trying to discern what they were in the limited time I had to look at it the other day, I do not have the unit nearby I will have to go back tomorrow to check it again, just if you could point me in a good direction of some things ot try/look at when I go back, I would greatly appreciate it.

here is a pic of the upper area maybe it can help shed some light on this issue.

[Ken Layton]

The picture of the output transformer package shows that the internal (back of jukebox cabinet) volume control is connected. HOWEVER, the needed jumper is missing!

See the silkscreened picture next to the terminal strip? When the back of the cabinet (internal) volume control is connected the terminal with the red volume wire MUST be jumpered to the terminal directly to the right of it.

Also, the jukebox speakers are wired wrong! If there are no external speakers connected the purple wire should go to left channel E7 or E6 and the pink wire should go to the right channel E7 or E6. The black wire is correct on E1 and can stay put.

[maldo]

Ken, first off thank you for your help.

So if I jumper that to the post to the right, it will possibly correct this volume control issue? I remember looking at that diagram and thinking to myself, whats missing or wrong here, that is why I took the picture...


I will also correct the other issues listed with the speaker wire, and report back.

regards

[Ken Layton]

With that pink speaker wire on the left E1 terminal the way it is now, the right channel is being shorted to ground. I wouldn't be surprised to see the amplifier output transistors are damaged now with possible driver board damage too.

[ami-man]

Hi Maldo,

Ken is correct with regards to the volume control jumper plate.

The output package is split into left and right E1 to E7.
E1 is Ground and the black wire goes onto one of these, the pink and violet are connected to E2 trough to E6, if you put the wires on both E2's then the output will be at its lowest with the E6's being the highest. Do not use the E7 connections these are used from special purposes by operators and have no use in an home enviroment.

When you see that the pink and violet have been moved to just one channel you can bet that one channel of the amplifier has failed so to get by the output is just on one channel.

Regards
Alan Hood
ami-man
UK

[maldo]

I corrected the jumper, which fixed the volume control.

Not sure what is going on with the amp right channel, I hooked it up as advised and I got a super scratchy right speaker, so either the speaker is blown or that channel on the amp is bad.

Thank you again for all the help, I am in your debt

[ami-man]

Hi Maldo,

Try using an extension speaker to test the output from the two channels.
I would connect up using both of the E1 and E3 connections to see what get.

Regards
Alan Hood
ami-man
UK

[Ken Layton]

I bet the amplifier has a blown channel.

[ami-man]

Hi Maldo,

Check out the four fuses on the driver boards to see if any have blown. Each fuse is to protect the four output transistors so if blown replace temporary with a slightly lower rated fuse.
With no speakers connected if the temporary fuse or fuses blow then you will need to replace the effected devices.

Regards
Alan Hood
ami-man
UK