Pioneer SX-255R Service Manual - Page 18

Sx-255r, Sx-205, Adjustments

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SX-255R, SX-205 7. ADJUSTMENTS ADJUSTMENT OF FM TUNER SECTION • Set the FM/AM selector to FM BAND. • Connect the wiring as shown in Fig. 1-1. Step No. Adjustment Title Center 1 Adjustment Front End 2 Sencitivity Check Stereo 3 Distortion Check Stereo 4 Separation Check 5 TUNED IND. Lighting Level FM SG (1kHz, ±75kHz dev.) Frequency (MHz) Level (dBµV) 98 60 Reception Frequency Adjustment Display Location Specifications 98.0 MHz L151 Adjust so that the DC voltage of R151's both ends becomes OV±50mV. R151 DC VOLTMETER = ov ±50mV 98 Less than 10 98.0 MHz Less than 10 dBit V Less than 2%. 89 60 89.0 MHz T101 Check that it becomes within the standard by turning the IFT T101 in the FM/AM TUNER MODULE lessthan ±90° in race out ofstandard. 89 60 89.0 MHz Less than 23 dB. In case out of standard, cut the R157. 18 dB 12 V±3 dB. 98 18 (±3 dB) 98.0 MHz VR151 Adjust so that the indicator of TUNED IND. starts to light up. Note: Make indicator adjustments in order of AM -0 FM. ADJUSTMENT OF AM (MW) TUNER SECTION • Set the FM/AM selector to AM (MW) BAND. • Connect the wiring as shown in Fig. 1-1. Step No. Adjustment Title AM SG (400Hz, 30% Mod.) Frequency (kHz) Level (dBµV/m) Reception Frequency Adjustment Display Location Specifications TUNED IND. 1 Lighting Level Check 999"' Less than 65 999kHei Less than 65dB y Wm. In case out of standard, cut the R164. *1 : For the area using 10 kHz step, frequencies should be 1000 kHz. 26

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SX-255R,
SX-205
7.
ADJUSTMENTS
ADJUSTMENT
OF
FM
TUNER
SECTION
•
Set
the
FM/AM
selector
to
FM
BAND.
•
Connect
the
wiring
as
shown
in
Fig.
1-1.
Step
No.
Adjustment
Title
FM
SG
(1kHz,
±75kHz
dev.)
Reception
Frequency
Display
Adjustment
Location
Specifications
Frequency
(MHz)
Level
(dBμV)
1
Center
Adjustment
98
60
98.0
MHz
L151
Adjust
so
that
the
DC
voltage
of
R151's
both
ends
becomes
OV±50mV.
R151
=
ov
±50mV
DC
VOLTMETER
2
Front
End
Sencitivity
Check
98
Less
than
10
98.0
MHz
Less
than
10
dB
it
V
3
Stereo
Distortion
Check
89
60
89.0
MHz
T101
Less
than
2%.
Check
that
it
becomes
within
the
standard
by
turning
the
IFT
T101
in
the
FM/AM
TUNER
MODULE
less
than
±90
°
in
race
out
of
standard.
4
Stereo
Separation
Check
89
60
89.0
MHz
Less
than
23
dB.
In
case
out
of
standard,
cut
the
R157.
5
TUNED
IND.
Lighting
Level
98
18
(±3
dB)
98.0
MHz
VR151
18
dB
12
V±3
dB.
Adjust
so
that
the
indicator
of
TUNED
IND.
starts
to
light
up.
Note:
Make
indicator
adjustments
in
order
of
AM
-0
FM.
ADJUSTMENT
OF
AM
(MW)
TUNER
SECTION
•
Set
the
FM/AM
selector
to
AM
(MW)
BAND.
•
Connect
the
wiring
as
shown
in
Fig.
1-1.
Step
No.
Adjustment
Title
AM
SG
(400Hz,
30%
Mod.)
Reception
F
requency
Display
Adjustment
Location
S
pec
ifi
cat
i
ons
Frequency
(kHz)
Level
(dBμV/m)
1
TUNED
IND.
Lighting
Level
Check
999
"'
Less
than
65
999
kHe
i
Less
than
65dB
y
Wm.
In
case
out
of
standard,
cut
the
R164.
*1
:
For
the
area
using
10
kHz
step,
frequencies
should
be
1000
kHz.
26