Sanyo FXD-780GDSS - Electrical Adjustments; FM RF & IF Alignment

— 4 —
ELECTRICAL ADJUSTMENTS
ALIGNMENT OF FM RF & IF SECTION
Set the radio for FM reception. FM signal generator should be coupled with antenna receptacle, through dummy.
FM SG
&
STEREO SG
SET
T.P
DISTORTION METER
AC VOLTMETER
VTVM
*1 ：Refer to “DUMMY BOX SCHEMATIC” (Page 10) Fig.11-2
*2 ：Refer to “DUMMY BOX SCHEMATIC” (Page 10) Fig.11-3
FM
DUMMY
ANTENNA
DUMMY
LOAD &
SW BOX
*1 *2
Fig. 4 * SG frequency should be as accurate as possible.
STEP
1
2
3
4
5
6
7
7*
RDS
GENERATOR
FREQUENCY
Non-Mod.
Non-Mod.
98.1MHz
1kHz, 22.5kHz dev.
SG att:66dBµ EMF
98.1MHz
1kHz, 22.5kHz dev.
SG att:6dBµ EMF
98.1MHz
1kHz, 22.5kHz dev.
SG att:6dBµ EMF
88.5MHz
107.9 (108)MHz
SG att:6dBµ EMF
98.1MHz
SG att:25dBµ EMF
98.1MHz
1kHz, 22.5kHz dev.
SG att:33dBµ EMF
RADIO DIAL
SETTING
87.5MHz
107.9MHz
108MHz
98.1MHz
98.1MHz
88.5MHz
87.5MHz
107.9 (108.0)
MHz
98.1MHz
TEST MODE
*2
98.1MHz
TEST MODE
*2
OUTPUT
INDICATOR
DC VTVM to test
point
VT
DC VTVM to test
point
VT
AC VTVM to test
point*
AC VTVM across
speaker or 4 ohms
load
AC VTVM across
speaker or 4 ohms
load
AC VTVM across
speaker or 4 ohms
load
Adjust so that the
“ST” mark of LCD
Display appears
Adjust like to appear
for 0.95 of LCD
Display
ADJUST-
MENT
—
L103
FM OSC
L110
FM DET
L107
FM MIX
L110
FM ANT
L102
FM RF
L100
FM ANT
L102
FM RF
R129
FM SD
R204
REMARKS
Check the voltage over than
1.1 V.
Adjust for 6.9±0.1V
NULL VOLTAGE to become
-20±20mV.
Adjust for Maximum output Level.
Adjust for Maximum output Level.
Check for SPEC.
Sensitivity of the seeking fre-
quency.
Sensitivity of the S meter.
*1 : Perform step 6 after MPX adjustment of the following page (page 6).
*2 : Setting up TEST MODE at page 7.