Service manual

8
AVR-1603/683
ADJUSTMENT
Tuner Section
CONNECTION DIAGRAM OF MEASURING INSTRUMENTS


 FM
STEREO
MODULATOR
FM SSG
Digital
Voltmeter
75ohm
T402 T403
IC402
VR402
TUNER B'D
R471
20
+14
−10
dB


 AM
T402 T403
IC402
TUNER B’D
R471
VR401
FM ALIGNMENT
Input Output Adjustment
Step
Alignment
Item
Tuning
Frequency
Setting
Type Frequency
Input
Level
Modulation Coupling Type Connect to Points Adjust to
1
Center
Adjustment
98.1MHz
(98.0MHz)
FM SSG 98.1MHz 60dBµ
Mono
1kHz 100%
Antenna
Terminal
Digital
Voltmeter
R471 T402 ± 50mV
2 Distortion
98.1MHz
(98.0MHz)
FM SSG 98.1MHz 60dBµ
Mono
1kHz 100%
Antenna
Terminal
Distortion
Meter
Output
Terminal (L)
T403
Minimum
Distortion
3 Repeat Steps 1 and 2
4 Signal Level
98.1MHz
(98.0MHz)
FM SSG 98.1MHz 20dBµ OFF
Antenna
Terminal
Light “TUNED” on
FL Display
VR402
AM ALIGNMENT
Output Adjustment
Step
Alignment
Item
Frequency Input
Type Connect to Points Adjust to
Remarks
1 Signal Level
999 (1000)
kHz
AM SSG

VR401
Light “TUNED” on
FL Display
SSG OUTPUT
74dB
µ
(EMF)