It's an operation manual with a service chapter. For the
CPU, the adjustments are the same than the P5 excepting for the double voices,
so if you have the P5 service manual it should be there in section 4 (as the P10
manual says).
Regarding the power supply:
- The output of U602 +15 voltage regulator should
read +15.000 v. adjusting R603
- The output (pin 2) of U604 -15 regulator should read
-15000 v. adjusting R606
It's the only procedure listed.
There is also a section regarding diagnostics but you
need to insert PROM MTEST.3.10 and TENPROG.1 in U304 and U306 respectively. I
have no idea where to get those PROMS...
Hope this helps.
Regards.
Miguel.
Sent: Wednesday, June 30, 2010 7:15 PM
Subject: [vintagesynthrepair] Re: Prophet 10
Thanks Miquel,
I have a schematic but that is all. Does your manual
have any diagnostic/troubleshooting help? Or is it more of a user manual? Does
it have specs for voltage regulation/ripple? Any text on troubleshooting the
computer section would be appreciated.
--- In vintagesynthrepair@yahoogroups.com,
"Miguel Mendoza" wrote:
>
> I'm not very sure but
perhaps there is any voice that can't be tuned properly (regarding the led
behaviour). Mine one is working properly but I have to wait 2-5 minutes until
the knobs start to work fine, mainly the filter cut off.
>
> I
have a good service manual but only on paper, I bought it in Manual Minor. If
you have any concrete question about the schematics perhaps I could
help.
>
> Is the hum coming into the audio path?
>
>
>
>
> From: Frank Simon
> Sent: Wednesday, June 30,
2010 1:56 PM
> To: vintagesynthrepair@yahoogroups.com
> Subject: Re: [vintagesynthrepair] Re: Prophet 10
>
>
>
>
> OK, That's what I'm after. Mine does hum but the
Regulated voltages are all correct. I did make a comment on ripple but not so
sure that is an issue. I would like to move on to the computer board after I
bless the PSU. Can anyone guess why sometimes the the LEDs light and and
somtimes they don't? Does that seem to be Processor related? I would rather
chase audio. Also can I unplug all the boards off the Computer board except
power for troubleshooting?
>
>
> ----- Original Message
-----
> From: Miguel Mendoza
> To: vintagesynthrepair@yahoogroups.com
> Sent: Wednesday, June 30, 2010 4:59 AM
> Subject: Re:
[vintagesynthrepair] Re: Prophet 10
>
>
>
>
>
I don't hear any hum in my Prophet 10
>
>
> From: Frank
Simon
> Sent: Wednesday, June 30, 2010 5:30 AM
> To: vintagesynthrepair@yahoogroups.com
; SequentialCircuits@yahoogroups.com
> Subject: [vintagesynthrepair] Re: Prophet 10
>
>
>
>
> Are there any Prophet 10 owners that can answer a question for
me? Can you hear your transformer hum when you power up?
> Frank
>
----- Original Message -----
> From: Frank Simon
> To: vintagesynthrepair@yahoogroups.com
; SequentialCircuits@yahoogroups.com
> Sent: Monday, June 28, 2010 11:24 PM
> Subject: Prophet
10
>
>
> My P10 is wacko. Sometimes I turn it on it lights
up and acts like it wants to work but if I cycle the power nothing will light
except the tune LED as if it is in tune mode but doesn't time out. If I cycle
power something different may happen. I think the PCB3 board has issues would
anyone agree? All Power supplies are good with DVM but I see noise ripple on
supplies with .2 to .5V that seems high to me. It is not 60 cycle ripple but
very random noisy ripple. Not sure of best trouble shooting approach of this
board. My P10 shematic is freeby with poor zoom in ability. My P5 is better but
refernce designators and power supplies seem different. Anybody got a good
service manual or advice?
> Frank
>