Sanyo FXD-780GD, Руководство по обслуживанию

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— 5 —
ALIGNMENT OF AM RF & lF SECTION
Set the radio for AM reception. AM signal generator should be coupled with antenna receptacle through dummy.
Set VOLUME control to maximum and TONE to center. Attenuate signal generator output to maintain 0.5 watts (1.4 volts across
4 ohms load) on AC voltmeter.
AM SG
&
STEREO SG
*1
：
Refer to “DUMMY BOX SCHEMATIC” (Page 10) Fig.11-1
*2 ： Refer to “DUMMY BOX SCHEMATIC” (Page 10) Fig.11-3
*1 *2
AM
DUMMY
ANTENNA
DUMMY
LOAD &
SW BOX
SET
T.P
DISTORTION METER
AC VOLTMETER
VTVM
Fig. 5 * SG frequency should be as accurate as possible.
STEP
1
2
3
4
GENERATOR
FREQUENCY
Non-Mod.
Non-Mod.
1000kHz, 999kHz
400Hz
30% MOD
SG att: 20dB
µ
EMF
1000kHz, 999kHz
400Hz
30% MOD
SG att: 30dB
µ
EMF
RADIO DIAL
SETTING
530kHz
531kHz
1710kHz
1602kHz
1000kHz
999kHz
1000kHz
999kHz
TEST MODE*
OUTPUT
INDICATOR
DC VTVM to test
point
VT
DC VTVM to test
point
VT
AC VTVM across
speaker(L or R) or 4
ohms load
Adjust so that the
“ST” mark of LCD
Display appears
ADJUST-
MENT
—
—
L108
AM IFT1
L111
AM IFT2
R124
AM SD
REMARKS
Check the voltage over than 2.5V.
Check the voltage less than 7.5V.
Adjust for Maximum output Level.
Sensitivity of the seeking fre-
quency.
* Setting up TEST MODE at page 7.
ELECTRICAL ADJUSTMENTS