Alpine TMX-R2000 - Adjustment Procedures; IR Transmitter and ALC Circuit Adjustments

Adjustment Procedures
Equipment
1 Digital OscilloScope (For frequency measurements)
2 Wireless Headphone
3 Multi-meter Fluke F17B or equivalent
4 Adjustment Tool (Small non-metallic screwdriver or equivalent)
5 Testing Fixture (To hold Monitor in place)
6 Power Supply ( 12VDC)
A. IR Transmitter Adjust (FrontKey Board):
Step Measure Adjust Value Description Apparatus
1 U1 PIN8 VR3 2.8MHz
1) SELECT A_CH
2) Touch U1 PIN 8, Adjust
VR3
OscilloScope
2 U1 PIN12 VR1 2.3 MHz
1) SELECT A_CH
2) Touch U1 PIN 12,
Adjust VR1
OscilloScope
3 U1 PIN8 VR4 3.8 MHz
1) SELECT B_CH
2) Touch U1 PIN 8, Adjust
VR4
OscilloScope
4 U1 PIN12 VR2 3.2 MHz
1) SELECT B_CH
2) Touch U1 PIN 12,
Adjust VR2
OscilloScope
B
ˊ
ALC Circuit Adjust ( Main Board):
Status Measure Adjust Value Description Apparatus
ALC On D30
(Cathode)
VR2 1.24V
1. Select ALC On
2. Touch D30 and
Adjust VR2
Multimeter
ALC Off D30
(Cathode)
VR1 2.0V
1. Select ALC Off
2. Touch D30 and
Adjust VR2
Multimeter
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