SPHINX
Project Two Mk2 Service Manual
11
9. PROBLEMS AND SOLUTIONS
At the moment of writing the Project Two Mk2 has
two known specific problems.
If in the future you encounter any problem(s) you
may enter the info in this table. This table can then
be used for future reference.
Please also send (by fax or e-mail) the specific
information to the
Sphinx International Service
Department
(see page 3): this info can then be
added to the general database to aid others.
Problem
Cause
Solution
Refer to
page/file
Volume potmeter has not
enough gain range
Overall Gain of pre-amp is too
high
Change R76 (left channel)
and R85 (right channel) from
3k33 to 1k8.
Pj2Adjust.PDF
Oscillation problem at balanced
output
Not enough frequency
compensation across U2 and U3
Install a ceramic condenser
(56 pF / 50 V) between pin 2
and pin 6 of U2 and U3
Pj2Adjust.PDF
