Adjustment; Tuner Section - Pioneer XR-A670 Service Manual

6. ADJUSTMENT

6.1 TUNER SECTION

6.1.1 For MYXJ and NVXJ Types
FM Tuner Section
• Set the mode selector to FM BAND.
• Connect the wiring as shown in Fig. 1.
FM SG (1kHz, ± 75kHz dev.)
Step Adjustment
Frequency
No. Title
Front End
1
Sensitivity
2 Stereo Distortion
(ON STEREO)
TUNED IND.
3
Lighting Level
Note:
Before adjusting, make sure there is no gap between L6101 and L6102 as well as between L6103 and L6104. If there is a gap between them,
bring them into contact with each other first, and then make adjustments.
AM Tuner Section
• Set the mode selector to AM BAND.
• Connect the wiring as shown in Fig. 1.
AM SG (400Hz, 30% Mod.)
Step Adjustment
Frequency
No. Title
Front End
1 999 (∗1)
Sensitivity
Note (∗1) : For the area using 10kHz step, frequency should be 1000kHz.
AM SG
MPX SG
AM
antenna
terminal
FM
antenna
terminal
Level
(MHz) (dBµV)
106 0 to 30
98
80
18 ± 2
98
Level
(kHz) (dBµV/m)
35 to 45
60cm
Center Center
FM SG
FM75Ω antenna terminal
Fig.1 AM and FM Adjustment Wiring Diagram
FM/AM TUNER MODULE
AXX7042
YELLOW BLACK
L6101
L6105
T6101
L6102
L6104
L6103
Fig.2 Adjustment Point
Reception
Adjustment
Frequency
Location
Display
L6104
L6105 Adjust so that the DC voltage between the
106MHz
L6102 IC6201 - pin 20 and GND becomes at maximum
T6101 level.
Minimize the distortion with 1/8 rotation of the
98MHz T6101
core.
Adjust so that the indicator of TUNED IND.
98MHz VR6201
starts to light up.
Reception
Adjustment
Frequency
Location
Display
Adjust so that the DC voltage between the
T6201
999kHz (∗1)
IC6201 - pin 20 and GND becomes at maximum
level.
Loop antenna
AM antenna terminal
PRODUCT
T6201
Pin 20
XR-A670, XR-A370
Specifications
Specifications
DC
Voltmeter
IC6201
VR6201
57