Vintage Simmons Drums (UK) Users Group

Hi,
I need to have some precisions about SDS2000, but it would be better 
for me to find some scematics about it.
I have a problem with mine & gave it to a technician friend .
The problem is that the SDS2000 becomes noisy when I switch on the 
studio light for example, & when I switch the SDS2000 on, it's doing 
a quite bad noise as well !
My friend thinks the brain should be electrically under supplied...so 
he's asking me to find out what are some tensions of the three 
electric supplies (?!), I hope my translations are not too bad???!!!
So, there are :
one + 5 volts supply
the LM 317 has a positive tension but there ; what is the value it 
should be ?
the M 337 has a negativ tension , here again what is the value ?
Please advise.
Patrice.