Sanyo FXC-750GD, Servise Manual

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— 2 —
ELECTRICAL ADJUSTMENTS
(FOR FXR-725GD)
CO-AX CABLE
LEFT CHANNEL OUTPUT
RIGHT CHANNEL OUTPUT
UNIT
AM DUMMY ANTENNA FM DUMMY ANTENNA
AM S.G.
(50
Ω
)
PLUG TO FIT ANTENNA
RECEPTACLE OF UNIT CO-AX CABLE
METAL SHIELD CAN
DUMMY LOAD & SWITCH BOX (FOR STEREO UNIT)
FM S.G.
(50
Ω
)
AC V.T.V.M. OR SCOPE
10
Ω
45
Ω
60
Ω
33
Ω
15PF
4
Ω
20W L
L
R
R
4
Ω
20W
60PF
PLUG TO FIT ANTENNA
RECEPTACLE OF UNIT
METAL SHIELD CAN
Fig. 1-1 Fig. 1-2
Fig. 1-3
DUMMY BOX SCHEMATIC
ALIGNMENT OF
AM RF & lF
SECTI0N
Set the radio for AM reception. AM signal generator should be coupled with antenna receptacle through dummy (see Fig.1-1).
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.
FM SG
&
STEREO SG
(See Fig. 1.2)
FM
DUMMY
ANTENNA
(See Fig. 1.3)
DUMMY
LOAD &
SW BOX
SET
T.P
DISTORTION METER
AC VOLTMETER
VTVM
Fig. 2 * SG frequency should be as accurate as possible.
For RADIO DIAL SETTING in the table below, settings marked are for the (10 kHz step) mode and those marked are for the
(9 kHz step) mode.
STEP
1
2
3
4
GENERATOR
FREQUENCY
Non-Mod.
Non-Mod.
1000kHz, 999kHz
612kHz
400Hz, 30% MOD
SG att: Less than 17dB
610kHz, 612kHz
400Hz, 30% MOD
SG att: 17dB
RADIO DIAL
SETTING
530kHz
531kHz
1710kHz
1602kHz
1000kHz
999kHz
612kHz
610kHz
612kHz
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
AC VTVM across
speaker(L or R) or 4
ohms load
ADJUST-
MENT
L134
AM OSC
—
L152
AM IF
L133
AM RF
REMARKS
Adjust for 1.4V. (TYP)
Check the voltage less than 7.5V.
Adjust for Maximum Level.
Adjust for Maximum Level.