7
ALIGNMENT PROCEDURES
FM ADJUSTMENT
Equipment Required
z
AM IF/RF signal generator
z
Solid-state voltmeter (SSVM)
z
Regulated DC power supply
z
2-CH voltmeter
z
Distortion meter
FM Alignment Using FM Signal Generator
Note
: Press the radio power switch to on the radio. Signal generator output must be kept as low as possible
to avoid overload and clipping.
Step
Generator
Coupling
Generator
Display
Setting
Adjustment
Remarks
Stereo
Separation
Signal
Generator
to antenna
receptacle
98.1 MHz
Int. 1 kHz
Dev. 75 kHz
L+R = 90 %
pilot = 10 %
98.1 MHz
VR1
Adjust AF
output power
at maximum
separating
more than 30 dB
FM SNC
Adjustment
98.1 MHz
Dev. 75 kHz
L+R=90 %
Int. 1 kHz
60dBµV output
98.1 MHz
@ 40 dBµ
98.1 MHz
VR2
Stereo Separation
25 dB (±5 dB)
STOP
SENS.
Signal Generator
to antenna
receptacle
98.1 MHz
Mod. 1kHz
Dev 75kHz
98.1 MHz
VR3
Adjust AF to
stop station.
Note:
The tuner module is well-adjust and adjustment is not recommended.
Summary of Contents for FXD-680GD
Page 7: ...6 ALIGNMENT LOCATIONS FM TUNER ...
Page 18: ...17 ELECTRICAL ADJUSTMENTS DUMMY BOX SCHEMATIC AM DUMMY ANTENNA FM DUMMY ANTENNA ...
Page 19: ...18 BLOCK DIAGRAM FOR FXD 680GD ...
Page 20: ...19 BLOCK DIAGRAM FOR FXD 685GD ...
Page 21: ...20 IC TRANSISTOR LEAD IDENTIFICATION ...
Page 22: ...21 CD MECHANISM EXPLODED VIEW MECHANSIM 94 01683 10 ...
Page 23: ...22 CABINET CHASSIS EXPLODED VIEW ...
Page 36: ...35 SCHEMATIC DIAGRAM MAIN BOARD FOR FXD 680GD FXD 685GD ...
Page 37: ...36 SCHEMATIC DIAGRAM KEY BOARD FOR FXD 680GD FXD 685GD ...
Page 38: ...37 SCHEMATIC DIAGRAM CD SERVO BOARD FOR FXD 680GD FXD 685GD ...
Page 39: ...38 SCHEMATIC DIAGRAM REMOTE BOARD FOR FXD 680GD FXD 685GD ...
Page 40: ...39 SCHEMATIC BOARD DIAGRAM MAIN FOR FXD 680GD FXD 685GD ...
Page 42: ...41 SCHEMATIC BOARD DIAGRAM CD SERVO FOR FXD 680GD FXD 685GD ...
Page 43: ...42 SCHEMATIC BOARD DIAGRAM REMOTE FOR FXD 680GD FXD 685GD ...
Page 44: ...FXD 680GD FXD 685GD No 1702YI3944 Printed In China issue date 27 04 ...