ATU-HP Technical Instruction Manual
Oct.06.11
Contents Page
4 TESTING
AND
ADJUSTMENT
4.1
INTRODUCTION
4-1
4.2
OPERATING
PRECAUTIONS
4-1
4.3
FUNCTIONAL
TESTS
4-1
4.3.1 General
4-1
4.3.2 Initial
Settings
4-1
4.3.3
Manual Check of Tuning Drive
4-2
4.3.3.1 Inductive Tuning Motor
4-2
4.3.3.2 Resistive Tuning Motor
4-2
4.3.4
Initial Check of RF Tuning and
Automatic
Operation
4-3
4.3.5
Final Tuning of RF Circuits
4-4
4.4
NON-STANDARD
ADJUSTMENTS
4-5
4.4.1
Antenna Current Meter Calibration
4-5
5 MAINTENANCE
AND
TROUBLESHOOTING
5.1
GENERAL
5-1
5.2
SCHEDULED
MAINTENANCE
5-1
5.2.1 Cleaning the ATU-HP
5-1
5.2.2 Checking Hardware
5-1
5.3
CORRECTIVE
MAINTENANCE
5-1
5.3.1 Replacing a Failed Fan
5-2
5.3.2 Checking/Replacing the Inductive
Tuning Motor
5-2
5.3.3 Checking/Replacing the Resistive
Tuning Motor
5-3
6
THEORY OF OPERATION
6.1
INTRODUCTION
6-1
6.2 ANTENNA TUNING UNIT OVERVIEW
6-1
6.2.1 ATU Control PWB
6-1
6.2.1.1 Power Supplies
6-1
6.2.1.2 Servo Probe
6-1
6.2.1.3 Forward/Reflected Power Probe
6-1
6.2.1.4 Input Voltage and Current Probes
6-1
6.2.1.5 Microcontroller
6-2
6.2.1.6 Antenna Current Probe
6-2
6.2.2 Matching Transformer/Current Probe
6-2
6.2.3 Resistive Matcher/Capacitor PWB
6-2
6.2.4 Tuning Coils
6-2
