Phoenix Gold Phorum

Does anyone know where to get the specific schematic diagram for the Phoenix Gold Ti400.2? I have issues with filters on this amplifier, and I can fix it, but is very difficult to trace the problem w/o the original schematic. Any help would be greatly appreciate it.

The schematics were never made unlicensed by Phoenix gold.

Post up your specific issue and I'm sure we can give you some helpful tips.

Well,, the issue appeared as an unequal balance in one of the channels, given that the Channel Balance, and all other equalizer knobs, such as BASS are adjusted to the zero. The difference is about 10 % and is noticeable. But when I increase the BASS, the difference quickly reaches about 20-30% or more, and becomes a major annoyance.
> To my understanding, the issue lays in the equalizer and filters of the preamplifier and/or commutation circuits, but prior to the main amplifier circuit. So my question is there any way to perhaps Bypass these circuits and wire the signal input right to the main (final) amplifier module? That is given that I will control Volume and other balance/equalizer levels with my input signal of course and do not care of these functions at PG Ti400.2. Does anyone have these issues and, perhaps, what my alternatives are? Thanks a bunch in advance!!

Its the blue pots...you may have to replace all 8 that are in a row...the tolerance on those pots I believe is either 20 or 10%. What drivers are you running and crossover points?

There should be a "BYPASS" selection on the xover....If it is already set to bypass then perhaps the bass pots need to be replace, can't by pass them unless you want it to be permanent.

I had these issues with several Ti amps and only notice it when testing with sine waves, one ch would be different from the opposite even though signal was same on both left and right. This only happen when the xover switch was set to either LP or HP.

Trickyricky,
Thanks for the reply and your thoughts!! I still need to "pick up from your brain" for just a couple more questions, if I may...

I am so glad you you got it where the problem might be, when you said about 8 pots and BYpass switch. The signal goes from the HELIX Signal processor and completely bypassing the pre-amplifier board as you suggested. When I tested, the issue were still there. So the issue is on the final end- amplifier board. I was trying to tinker with the BASS pot which I got into just right now and I have discovered the corroded leads on it. I need to assembly everything back and see if my re-soldering/cleaning on these spots fix it. Also, attaching pictures of these boards (including the cover) we are talking about so you possibly can point out if anything else could be done there on the end-amp board.

I have a brief follow up questions about the same amplifier, since I open it up and find another nuisance: Ti400.2 has three blue LED on the top of the amplifier cover, and one of them broke. By any chance do you know what they are (their value and brand) since it looked like they stopped working correctly, i.e. I believe they are a two colors LED, e.g. while normally emitting blue, they start emit RED when there is overload on the channel. I might be mistaken here, since I never got that overload condition, about two color LED, but could you please confirm?


Any of your thoughts wound be greatly appreciated.

the leds are just a blue led. Sometimes the color can be off a bit so it would probably be better to replace them all so they match.

If you are talking about the three LEDs that are on the top cover in a triangle formation then those are only BLUE....the RED LEDs inside the amplifier (each channel has two, so a total of four) should be lite when powered on. Then you have the three status LEDs that are right by the power terminal block.


If you are bypassing the xover then don't worry or focus on that section. Look at the bass pots and the gain pots, I recently repaired a ZX475ti that had a bad gain pot so the channel was completely out (no output). Another thing to keep in mind is the solder joints on the ribbon cable as moving the xover board a few times the stress on those joints will cause them to break open (not your case but something to watch out for in case you do run into this problem after assembling it and retesting it.).

The three BLUE LEDs are in series so if one goes out the others will not power up, rarely one may dim out or go out and still allow current to flow allowing the other two to light up. I would just replace all three with any color of your choice just as long as the voltage rating is above 12v. I may have some bright blue LEDs if you need some as well as those pots (gain and bass)