Vintage Synth Repair

Pete, 

 

Many thanks for the schematics and sorry to hear about the job (there's a
lot of it about). Are the other Omni files still on that server somewhere? I
would like to get a hold of them. I'm still kicking myself for not
downloading them when I first found your page. I thought "Hey, it's not
going to go away is it..?" Famous last words.

 

And many more thanks to all who post schematics and service info for the old
beasts. We appreciate it.

 

mw

 

-----Original Message-----
From: Peter Brown [mailto:pbrown@cs.umass.edu] 
Sent: Friday, September 12, 2003 8:08 PM
To: vintagesynthrepair@yahoogroups.com
Subject: RE: [vintagesynthrepair] OMNI 2 power supply

 

On Fri, 12 Sep 2003, masada wilmot wrote:

> I've tried looking for the schematics on-line and the site where I found
> them previously seems to be dead. Can you or someone e-mail me the power
> supply schematic? I'll take a look and let you know if there are any
issues
> with parts. I'll try and give you a source for them as well. 

masada, 

sorry about the omni site goin' down (it went down along w/my job )-:

for the time being, here are links to the assembly drawing & schematics 
for the omni power supply

http://www.cs.umass.edu/~pbrown/images/ps-assy.jpg
http://www.cs.umass.edu/~pbrown/images/ps-schematic.jpg

also, i have attached the parts list for the power supply from the manual 
(unfortunately, it doesn't list all parts)

hope this helps...

regards, PB>>

=====
PC BOARD, "POWER SUPPLY"

REFERENCE              ARP PART NUMBER  ARP/MFG NUMBER    DESCRIPTION
============================================================================
====
CR1,2,3,4,5                 1200201     1N4001            RECT, 50V, 1A
Q3                          1303001     2N3906            TSTR, PNP, GP
Zl                          1401301     723DC             IC, VOLTAGE
REGULATOR
Z2                          1400801     LM30lAN           IC, OP AMPL
R7,8                        1000111     BW-20             RES, WW, TC, 0.68
OHM, 1W, 5%
R19,20                      1000915     U201R104B         POT, ROTARY TRIM,
100K, 1/4 W, 30%
C8                          1100609     G-0-001-G-20-0    CAP, TANT, 1UF,
35V, 20%
C6,7                        1100612     G-0-010-G-20-0    CAP, TANT, 10UF,
35V, 20%
C3                          1101702     TAD250TQ50        CAP, ELECT, 250UF,
50V, +50-10%
Cl,2                        1101301     TCW102V050N1R3P   CAP, ELECT,
1000UF, 50V, +75-10%
Q1                          1304501     MJE1100           TSTR, NPN, PAR
DARL
Q2                          1304301     MJE1090           TSTR, PNP, PWR
DARL
T1                          5704401                       TRANSFORMER, POWER
F1                          1700404     MDV-1/2           FUSE, PIGTAIL,
SLO-BLO 1/2A 250V







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