Sharp 29A-SX1, Service Manual

Page: 12 / 86

12
29A-SX1
29A-SX5
29A-SX8
SX-68JF200
12
SOUND LEVEL ADJUSTMENT
NO
.
Adjustment par
t
Adjusting procedure and conditions
W
a
v
e
fo
rm
and others
1
SUB V
OL
(Bus
adjustment)
1
Receiv
e E-12ch (P
AL colour bar).
Signal con-
tent: 400Hz 100% Mod.
2
Connect the probe of the meter (*) to (SI) con- nector
.
3
Select SUB-V
OL in the ser
vice mode
.
4
Adjust the SUB-V
OL data to mak
e the meter
indicate 10.8Vr
ms (at L-ch).
Adjustment v
alue :
11.2
±
0.3Vr
ms
Adjustment v
alue :
11.2
– 0.05Vr
ms
1
Receiv
e E-12CH (P
AL colour bar).
2
Maximiz
e the sound v
olume to v
e
rify that the
sound is output from the speak
er
.
Then, set
the non-signal state
.
3
At this time
, v
e
rify that the audio m
ute oper-
ates
.
4
After chec
king the oper
ation, set the sound
v
olume to be the smallest.
Note: *
S
P
A
TIALIZER OFF
*
S-Nor
mal state
*
S-V
OL Max
*
S-BOOSTER OFF
* :
Use the m
ultimeter or similar
which sufficiently atten
uates the
high-band frequency (bigger than 100kHz).
SIF (NICAM/IGR) ADJUSTMENT
NO
.
Adjustment par
t
Adjusting procedure and conditions
W
a
v
e
fo
rm
and others
1
VCO COIL T2300
1
Receiv
e E-69CH (P
AL colour bar).
(Set the receiving frequency at AFT OFF 855.25 MHz.)
2
Connect the digital v
oltmeter to
TP202 (in the
main unit).
3
V
e
rify that it is tur
ned countercloc
kwise to 0V
and cloc
kwise to 5V
, and adjust
T2300 to mak
e
the DC v
oltage of
TP202 become 2.5
±
0.1V in
the r
ange
.
* Single-unit adjustment Vcc
5V
±
0.1V
IF input frequency
38.9MHz
±
10kHz
Control it under these conditions
.
Adjust
T2300 to mak
e the DC v
oltage of
TP2300(in
the NICAM unit) become 2.5
±
0.1V
.
After single-unit adjustment, chec
k the pr
actical
setup
.
Align the receiving frequency to the select chan- nel frequency
. (AFT OFF)
The chec
k
ed v
oltage m
ust be 2.5
V
±
1.0V
.
(T
ak
e care that
±
1.0 is considered f
or the
Vcc dif-
ference betw
een the single unit and unit, F
o
diff
er-
ence and so on, b
ut is not the adjustment preci-
sion.)
2
Noise m
ute
chec
k