Realistic STA-7 - Page 9

CONNECTION
NECTION
REPAIR
Connect
8
o
Load
to Speaker
Output.
Check Pop
Muting
circuit
included
in MAIN
Amp
lC
401
about
2-3
seconds
after Power
is
Switched
"an,,.
(lC4O2l.
U nit
activates
(1)
Check
MAIN
Amp
lC4O1l4O2.
(21
Check
TR504.
Pop
Muting
circuit
does not
work,
Pop
Muting
circuit
works.
Connect
8 O Load
to
Speaker
Output.
Connect
Audio
Osc.
to AUX
input.
Connect V.T.V.M.
to
Speaker
terminals.
(Figure
3)
AUDIO
OSC.
Check Equalization
Response
in
"SYSTEM"
position
position
= 0 dB).
(Figure
4)
V. T. V. M.
at 100
Hz
input.
(FLAT
Figure
4
t
;e"
+
Check
the
MAIN
Amp
Equalization
circuit.
See TROUBLESHOOTING.
Equalization
Response
at 100 Hz
does not
fall within
+6.5
i
2.5 dB.
Equalization
Response
at 100 Hz falls
within
+6.5
-+.2.5 dB.
to
next
section.
Proceed
-9-