Elmo ST-1200 - Noise is recognized before Projection; Noise is recognized after motor is started; Noise is recognized when sound drum is rotated

SOUND (Cont'd)
Case Point
Step
Remark
Silicon photo If Silicon photo diode is inferior,
diode replace during optical recorded film
(P5-77) reproduction.
Noise is
recognized
before
Projection
Noise is
recognized
after motor
is started
Noise is
recognized
when sound drum
is rotated
AMP assy
(P7-j)
Cancel coil
(P7-34)
Power IC
(P7-l9)
AMP assy
(P7-j)
If AMP assy is inferior, replace.
Adjust the position of Cancel coil or
if it is inferior, replace.
Replace IC3 (STK-015) if it is inferior,
at the same time, replace C32 (0.047
MFD) and R23 (5 ohms).
Check whether earthed circuit in AMP
assy is either inferior or mid-wired.
If the input wire to AMP assy is
excessively long and close by the
speaker circuit of AMP assy, cut the
wire adequately to prevent oscillation
of AMP assy.
P-15
P-17
P-15
Silicon photo If SOillld drum is touching Silicon
diode photo diode, adjust the position of
(P5-77) Silicon photo holder.
-30-
P-17