Crumar Musical Instruments User Group.

Hi, 

Electronics do deteriorate with time, some more so than others, as I've found on my Crumar Stringman which is 35 years old.

I would say, replace the chips first as chips aren't the most long lived of components. I'd follow by replacing ALL the electrolytic capacitors with like valued equivalents. What happens is the electrolytic in the capacitors dry up over the years and the values go adrift.

This happened to some caps on my Stringman, so I took the decision to replace all the electrolytics. The difference in tone is huge, it sounds much crisper now.



--- In crumar@yahoogroups.com, "asrdead" <tonyamaro2003@...> wrote:
>
> Hi,
> 
> Just acquired a performer and am attempting to fix the following problems any tips would be helpful as i'm a bit of a newbie in repair and schematics.
> 
> Problems:
> 
> No main output
> volume levels not responding
> eq section not working
> strings 8/16 not working although one of the two lights up
> 
> working:
> 
> brass section seems ok
> crescendo/sustain seems ok
> signal out ok-so I hear some strings this way
> all keys work
> mod section works
> resonance ok although seems a bit off? perhaps some adjustment?
> 
> SO:  After studying the schematics I'm assuming the 1450/741 chips are bad since they seem to affect the strings/main section?
> Im going to get some replacements and check it out. How about replacing caps? 
> any help would be appreciated
> cheers
> T
>