Sony STR-V 25 - Section 3 Electrical Adjustments

STR-V25
2-2, DIAL CORD STRINGING
1. Preparation
9-911-825-32
Cord, dial; 0.3mm dia g
/ \
whe / ti Crimp the eyelet
and then apply
gh
locking
compound.
ws : ‘1394mm___ -
») (55 inches)
[i = OMT: ——_—_
4h 5 —6mm .
2. Stringing
1). Turn the tuning capacitor shaft fully clockwise,
and set the dial drum to the position as
illustrated.
2). Follow the stringing procedure in the numerical
order given. °
® Receive a broadcasting-station signal
and set the dial pointer to the
frequency of the station on the dial
scale.
® After stringing,
(7) String below apply suitable
ee the dial pointer guide. locking compound.
o>
= sh
Lr
ee
,
\
°
7 ~~ o 7 : vs | dial pointer
@
two
and
half
ZA
BS.
‘iki
ass
oS
turns > Z ara
: 4 ~/ VU >
Ry ea
5) —= i
§ aS
@ String below
SQ
(4)
three
turns
the
lead
wires.
dial
drum
|@
one
turn}
r
——@ E
°
@ Hook the spring
to the boss.
®
ete eceae
half turns
O (inch)
STR-V25
SECTION 3
ELECTRICAL ADJUSTMENTS
TUNER SECTION |
FM Discriminator Alignment 1 Setting:
MODE switch:
MONO
VOM
frange: 2.5 V de}
Procedure:
di Detune the set.
2, Adjust the red core (primary-side) of IFT801
for 0 V dc reading on VOM.
17
/C8071 Dio
9 Note: Repeat the secondary-side and primary-
side adjustments several times.
—c-
R832
0807 —"°& ca02
lFT80O1
(primary-side : red)
tuner board
IFT807
(secondary-side : black)
FM Discriminator Alignment 2
Setting:
MODE switch: MONO
FM
rf
signal
distortion
generator
meter
FM antenna REC OUT
Carrier frequency: 98MHz terminal
Output level: 1 mV (60 d8)
Modulation: 400 Hz, 75 kHz deviation
(100 %)
Procedure:
Adjust the black core (secondary side) of
IFT801 for minimum distortion.