PIONEER XR-A4900/NVXJ
Manual de Servicio

XR-A6800, XR-A4800

6. ADJUSTMENT
6.1 TUNER SECTION
FM Tuner Section
� Set the mode selector to FM BAND. � Connect the wiring as shown in Fig. 1. Step No. Adjustment Title FM SG (1kHz, ± 75kHz dev.) Frequency Level (MHz) (dBµV)
106 98 (ON STEREO) 98 0 to 30

Reception Frequency Display
106MHz

Adjustment Location
L6104 L6105 L6102 T6101 T6101 VR6201

Specifications

1

Front End Sensitivity Stereo Distortion TUNED IND. Lighting Level

Adjust so that the DC voltage between the IC6201 - pin 20 and GND becomes at maximum level. Minimize the distortion with 1/8 rotation of the core. Adjust so that the indicator of TUNED IND. starts to light up.

2 3

80 18 ± 2

98MHz 98MHz

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. Step No. Adjustment Title
Front End Sensitivity

AM SG (400Hz, 30% Mod.) Frequency Level (kHz) (dBµV/m)
999 (�1) 35 to 45

Reception Frequency Display
999kHz (�1)

Adjustment Location

Specifications
Adjust so that the DC voltage between the IC6201 - pin 20 and GND becomes at maximum level.

1

T6201

Note (�1) : For the area using 10kHz step, frequency should be 1000kHz. 60cm Loop antenna

AM SG

Center

Center

AM antenna terminal DC Voltmeter

MPX SG

FM SG FM75� antenna terminal

PRODUCT

Fig.1 AM and FM Adjustment Wiring Diagram
FM/AM TUNER MODULE
AM antenna terminal T6201 AXX7042 YELLOW FM antenna terminal BLACK L6105 T6101 L6102 L6103 L6104

IC6201 Pin 20
VR6201

L6101

Fig.2 Adjustment Point
53