Realistic STA-115 - Operational Check

OPERATIONAL
CHECK
FOR CIRCUITS
Power Supply
Operation
Check
[.
aonn."t AC
cord to
standard
AC
power
rorr...l
(o Power
switch ON and
dial lamp
should
light.
)
(1)
Check
power
supply
circuit on
TUNER AUDIO P.C.B.,
fuses,
and
power
transformer.
(2)
See TROUBLESHOOTING
on
Page
33.
DC voltages
are
not correct.
DC
voltages
are correct.
START
CONNECTION
REPAIR
-B+
+
!
ro
TONE
CONTROL
& PROTECTOR
I
B-
L"_
Proceed
to
next
section
Audio Section Operation Check
(.
Conn..t BO
load to
speaker
output.
|
.
Connu.t
DC voltmeters to C701
(minus
[-]
(
to
ground)
of
main
amp circuits
on TUNER
i----
i_c_[e9(qo_ryeMp_p.!y_yo]t_ao_e_vyiLh_1q'IPyt_r
**Must
be
t30.5V
IO.SV."*
(1)
Check D701, C701, C702.
(2)
Check for short-circuits.
(3)
See
T
RO
UB
LESHOOTI NG on
page
33.
DC voltage is not
t31V t0.5V
DC voltage is
t31V t0.5V
Figure 5
702
(
PC.B.
c702
DC VOLTMETER DC
VOLTMETER
Figure
6
)andC
C.B.
ER AUDIO
nd
P.
TUI\
70t
UNE
)l
olm
t*f]
CONNECTION
STEP
1
:CK
REP AIR
CH
t\
LJ
OK
1
to
gr
AUD
-14-