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Electrical Adjustments - Sanyo FXD-780GDSS Service Manual

Full panel detachable high power fm/am stereo receiver compact disc player
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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
GENERATOR
STEP
FREQUENCY
1
Non-Mod.
2
Non-Mod.
3
98.1MHz
1kHz, 22.5kHz dev.
SG att:66dBµ EMF
4
98.1MHz
1kHz, 22.5kHz dev.
SG att:6dBµ EMF
5
98.1MHz
1kHz, 22.5kHz dev.
SG att:6dBµ EMF
6
88.5MHz
107.9 (108)MHz
SG att:6dBµ EMF
7
98.1MHz
SG att:25dBµ EMF
7*
98.1MHz
RDS
1kHz, 22.5kHz dev.
SG att:33dBµ EMF
*1 : Perform step 6 after MPX adjustment of the following page (page 6).
*2 : Setting up TEST MODE at page 7.

ELECTRICAL ADJUSTMENTS

VTVM
*1
FM
DUMMY
ANTENNA
*1 Refer to "DUMMY BOX SCHEMATIC" (Page 10) Fig.11-2
*2 Refer to "DUMMY BOX SCHEMATIC" (Page 10) Fig.11-3
Fig. 4
RADIO DIAL
SETTING
INDICATOR
87.5MHz
DC VTVM to test
point
107.9MHz
DC VTVM to test
108MHz
point
98.1MHz
AC VTVM to test
point*
98.1MHz
AC VTVM across
speaker or 4 ohms
load
88.5MHz
AC VTVM across
speaker or 4 ohms
load
87.5MHz
AC VTVM across
107.9 (108.0)
speaker or 4 ohms
MHz
load
98.1MHz
Adjust so that the
TEST MODE
*2
"ST" mark of LCD
Display appears
98.1MHz
Adjust like to appear
*2
TEST MODE
for 0.95 of LCD
Display
T.P
DUMMY
LOAD &
SET
SW BOX
* SG frequency should be as accurate as possible.
OUTPUT
ADJUST-
MENT
VT
L103
FM OSC
VT
L110
FM DET
L107
FM MIX
L110
FM ANT
L102
FM RF
L100
FM ANT
L102
FM RF
R129
FM SD
R204
— 4 —
DISTORTION METER
AC VOLTMETER
*2
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.

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