D-LA2A Support Thread

[benlindell]

OK cool, so I switched them, I'm still getting the same readings everywhere though. Just curious, what does having the AC power be out of phase do to the unit?

 

[bernbrue]

I think it may be time to take it all out of the case again so I can get to the bottom (pun intended) of this.

Ben,
it would be nice to see a picture of your heater wiring.
regards
Bernd

 

[[silent:arts]]

... Just curious, what does having the AC power be out of phase do to the unit?

correct is 250V each halfwave,
out of phase it is 2x250V each 2nd halfwave

 

[sonicwarrior]

Finally someone with a case from the evil man. Where did you get the lamp/LED holder from?
Any problems with the power switch in the middle?

 

[Cardinen]

Finally someone with a case from the evil man. Where did you get the lamp/LED holder from?
Any problems with the power switch in the middle?

Ahaha why evil man ? (i got this since a looong time)
The VU lamp are simple a blue led above the meter.

no problem with the power switch in the middle, both channels are very silent (Ch2 have slighty more hum than 1 but is not relevant... both are below -90 !!)

 

[sonicwarrior]

Ahaha why evil man?

He pissed off a lot of people here. E.g. I have a dual mic pre case from him were the front panel turned violet because of UV sensitiveness.

The VU lamp are simple a blue led above the meter.

I didn't mean the VU meters but the lamp in the middle. I don't know where to get a lamp/LED holder that fits this f****ing big hole.

 

[Cardinen]

I didn't mean the VU meters but the lamp in the middle. I don't know where to get a lamp/LED holder that fits this f****ing big hole.

Sorry I misunderstood, mine is this : http://www.banzaimusic.com/Jewel-Full-Assembly-Deep-Blue.html

p.s: Hope my case don't turn violet this night... 

 

[sonicwarrior]

Oh, I got the translation wrong. It's purple, not violet and it's a very dark purple. I also got a purple area at my Dual 1176 case.

Thanks for the Banzai. Comes in handy as I need to order from them anyway.

 

[benlindell]

Here's some pics of the bottom of my board

 

[benlindell]

Closer look at the right channel

 

[benlindell]

And the Left

 

[bernbrue]

Well, the heater wiring look ok for me, but what is that wire on top of the picture doing there? I would also check a few solder points for bad contact  or even shorts. I marked a few spots in the picture.
regards
Bernd

 

[benlindell]

Well, the heater wiring look ok for me, but what is that wire on top of the picture doing there? I would also check a few solder points for bad contact  or even shorts. I marked a few spots in the picture.
regards
Bernd

Good to know I got the heaters right. The wire at the top is the relay ground. I'm planning on going the whole thing joint by joint and double checking everything.

 

[bernbrue]

Ben
remove the wire, there is no need to ground the relay. It does´t make sense. Volker provided everything for proper grounding. This wire could be the reason for your problems.
regards
Bernd

 

[benlindell]

Oh, I thought the 0V of the relays weren't tied together hence the molex for the relay having 0V and 5V, I didn't use a molex connector for the relay power so I figured I had to hardwire it.

 

[benlindell]

Ok so..

Out of the case, and I reflowed a bunch of joints and I now have the left channel working (this is the one that has worked before then stopped working)

I then took everything plugged in to the left and put it on the right (XLRs, Transformers, Tubes, T4B, Pots, switches) and I get a big fat nothing I checked the heaters and I'm now getting the same on both channels (and the tubes are getting warm on the right as well) and I went through the high voltages and once again they're all pretty close, just a little under in most cases.

I just checked my relays to make sure they are working correctly on both channels.

I'm getting stumped.... Where should I be looking? It's weird to be getting no sound right?

Luckily I've eliminated a lot of variables
- Tubes
- T4B
- Pots
- Switches
- Transformers
- XLR connectors
- Heaters
- High-Voltage

Also on the working channel I'm getting way too much gain, did I still do the 25k pot + 75k thing wrong? I'm at unity at around 8:00, it's way too sensitive, even more so than real units I've worked with. I attached a pic of my gain pot hopefully I just got something backwards there.

 

[benlindell]

I just did a detailed check of all the resistors and caps from one channel to the other. I also checked the tube sockets and molexs for continuity.

 

[[silent:arts]]

Ben, does the right channel passes audio in bypass?
(just give the unit no power and check)

 

[benlindell]

Ben, does the right channel passes audio in bypass?
(just give the unit no power and check)

Yes it does

 

[[silent:arts]]

Ben, if you get nothing it could be something with the relays (one switching, one doesn't).

Do you have a scope to trace where the signal disappears?