Vintage Synth Repair

>>I run out of adjustment with the OSC HI trimpot. I've played around
with adjusting the OSC RANGE and OSC HI trimpots but again I run out
of adjustment.<<

Allan,

it's a long shot- I only really know the later models (rogue, prodigy
& source, & of course my beloved LAMM memorymoog) but: 

is there a component in the vicinity of the oscillator that's supposed
to track temperature changes? 
I once had a korg mono/poly in bits, & each of the four SSM oscillator
chips had a thermistor badly glued to it's top surface. the idea was
to temperature-compensate the IC, but it fails rather spectacularly if
the thermal device & the chip aren't properly coupled. 
this can happen when the glue goes brittle & cracks, leaving you with
an air-gap & no temp-comp. good temperature compensation is essential
for accurate V>Hz tracking at the higher frequencies, though the
errors can go un-noticed below 1000Hz or so.

there may be the vaguest reference to it on the schemo- as I recall,
it's a regular old-school resistor symbol (zigzag) with a dot next to
it & a circle round the whole lot. I may be wrong on this... but in
any case, the actual object is likely to be quite obvious on the PCB.

hth-
duncan.