Sony STR-V 25 - Audio Section

AUDIO SECTION
Note 1. DC bias and DC balance adjustments should be
performed about five minutes later after the
POWER switch is turned ON.
DC Balance Adjustment
(with no signal input)
VOM
{de range)
SPEAKER L-CH (R-CH)
RT652
(R-CH)
RT602
(L-CH)
US
model
RT651 RT601
(R-CH) (L-CH)
DC Bias Adjustment
(with no signal input)
— L-CH —
Adjust RT601 for 20mV
dc reading on VOM.
+ =
VOM
(de range) re
TI
power amp
board
STR-V25 STR-V25
2. Repeat DC bias and DC balance adjustments two
or three times.
Adjust
RT602
(L-CH)
and
RT652
(R-CH)
for
OV
dc
reading
on
VOM.
RT602
(L-CH)
RT652
(R-CH)
Canadian
model
— R-CH —
Adjust RT651 for 20mV
dc reading on VOM.
VOM
aa (de range)
+
Rey
,
For
Note on Schematic Diagram:
@
All
capacitors
are
in
uF
unless
otherwise
noted.
pF
:
pur
SOWV
or
less
are
not
indicated
except
for
electrolytics
and tantalum.
@
All
resistors
are
in
ohms,
%W
unless
otherwise
noted,
kQ : 10002, MQ : 1000k2
° f+ : nonflammable resistor,
e A: internal component.
e [7] : panel designation.
e@ (~~) : adjustment for repair.
e : B+ bus.
e@ == —e=: B— bus,
®
Voltages
are
de
with
respect
to
ground
unless
otherwise
noted,
®
Readings
are
taken
under
with
a
VOM
(20kQ/V),
no mark: { FM section (FM stereo}
’ {AM section (detuned)
( } : FM (detuned)
@
Voltage
variations
may
be
noted
due
to
normal
pro-
Cc
duction tolerances.
@ Switch
Ref.
No.
|
Switch
Position
§301-5, 6 MUTING OFF
$501-1 to 3 | PHONO ON
$502-1 to 4 | FM OFF
$503-1 to 4 | AM OFF
$504-1 to 3 |} AUX OFF
$505-1 to 4 | TAPE 1 OFF
S506-1 to 4 | TAPE 2 OFF
$507-1 to 4 | TAPE COPY 1—=2 OFF
$508-1, 2 MODE STEREO
$509-1,2 LOUDNESS OFF
|
$901-1
to
3
|
POWER/SPEAKERS
POWER
OFF
Qa
a
—~10—