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Subject: Re: [chromapolaris] Slider front panel not working properly

From: Yahoo Mail <sukhoy27@...>
Date: 2013-01-11

Dear Paul,
sorry for late snswer, and sorry because I lost Your reply message.
But I do what You suggested ,and You were right, it is not LM348 problems.

I try to check all Power Supply Volts.

1 ) I adjust the 5 Volt trim in Power Supply Board, because I measured 4,75 Volt  ( Set to 5,00 )

2 ) DC OK volt is easy to set, just turn the P.S. Trm andthe P.S led light .
       I measured the Volt for the DC OK and it is 2,95 V .
If i try to turn the trim V2,95 remain the same.

3) I do all the adjustnente as requested , But Master Volume Led not turn ON ,

4) Isee the new Jack in the Phone/Hi/low Exit connected BAD.
     as in the schematics I see The insulated Jack are bad connected ,in fact YELLOW cable goes to the Jack GND !!!!!
     This mistake I think was made at Italy fender Repai centre " Casale Bauer " where They update the Firmware to REV  8.0
      I try to fix this problem , and Polaris ,start to play again , but  MASTER volume Do not WORK .
       Started to hear pushbuttons click at first, and magically after few minutes Polaris starts playing.
       after few minutes Polaris Stop Playing. Mamma Mia !!!!!!!!!!!!!!!!!!!!!
        Do You think it is Bad Jack Output Connections ?
https://docs.google.com/file/d/0B2RFytG_u-I5V2NMUlhQSmZ1SVE/edit

https://docs.google.com/file/d/0B2RFytG_u-I5bVdMa1dpbUNTeFk/edit

As You see in these photos the jack were connected with GND in the Signal place !!!

5) I'm waiting to finish to test the GND in Polaris circuitry, I ask a friend HAM, expert in repairing HF radio ( DRAKE Collins, …) to better do the job.

Plese may you help me ?

Grazie
Mario



Il giorno 05/gen/2013, alle ore 16:52, Mario Faelli <sukhoy27@...> ha scritto:

Dear Paul ,
May you give me the exact Z53 chip code ?
Do you think it should be easy to find ?

In the input jack area I see a brown cable coming from the preamplifier board ( LM384 ) that it is unconnected , do you think it is this the reason that Polaris stop playing sounds ?

Thanks .

Grazie 

Faelli Mario

Autonoleggio Fa.Ma.
From iPhoneX

Il giorno 04/gen/2013, alle ore 22:37, "Paul D. DeRocco" <pderocco@...> ha scritto:

 

> From: sukhoy27@...
>
> i try to calibrate the sliders/Lever with Lower
> Function A7, A8, A9.
> But he Polaris Sliders still works from 2/4 to 4/4 range.
> For example, if i move the master slider Volume from 4/4 to
> 3/4 the volume goes perfectly down, but when
> slider master volume move from 2/4 to 1/4 volume quickly goes down.
> This is for all the lever on panel.
> The two lever ( Bender ) near keyboard seem to work good.

If all the sliders on the panel operate only in the top half of the
mechanical range, then there may be something electrically broken on the
panel, and calibration won't fix it. Are you sure this is the case? For
instance, does the sweep rate control do nothing until it is at least half
way up? The same for filter cutoff? Envelope attack time?

> I have also problem to do this operation :
>
> R45 on Main Board -- ADC Range
> Lower Function D 4
>
> LED in master section do not light up !
>
> I try to turn the R45 Clockwise and counterclockwise but
> nothing seems to work .

It could be a bad A/D converter chip (Z53), or something in that circuit.

> I also do not understand how to proceed to adjust the " lever
> assembly " voltage that should be between 2,0 and 3,0 volt.
>
> What is the lever assembly ?
> The adjust.doc manual means lever = Bender ?

The lever assembly is the thing with the two levers to the left of the
keyboard. If they work properly, with the proper ranges, then you don't need
to do the lever assembly voltage adjustment.

--

Ciao, Paul D. DeRocco
Paul mailto:pderocco@...