Antenna Tuner Adjustments - Icom AT-130 Service Manual

4-2 ANTENNA TUNER ADJUSTMENTS

ADJUSTMENT ADJUSTMENT CONDITION
PHASE 1 • S1
• S4-7
DETECTOR
CIRCUIT • Short pins of J13.
• Disconnect P6 from J6.
• Ground J15 with a jumper wire.
• TRANSCEIVER
Display freq. : 1.6 MHz
Output power : 10 W
Transmitting
2 • Same as above
IMPEDANCE
DETECTOR
CIRCUIT
FORWARD 3 • Same as above
DETECTOR
CIRCUIT
SWR 4 • Same as above
DETECTOR
CIRCUIT
NOTE: • After adjustment, remove the jumper wires from J15 and ground.
• After adjustment, Disconnect pins of J13.
• After adjustment, reconnect P6 to J6 and set S1 to [NORMAL] position.
LED's
PRESET
S1
NORMAL
OFF
7
S4
1
MEASUREMENT
UNIT
: PRESET TUNER
: OFF
(carrer only)
4 - 2
LOCATION
Connect an oscillo- 5 V (Tune R194 just
scope to the check before droped.)
point pin 2 of J8.
Connect an oscillo- 5 V (Tune C7 just
scope to check before drope.)
point pin 3 of J8.
Connect an oscillo- 1.4 – 2.4 V
scope to check
point pin 1 of J8.
Connect an oscillo- 0 – 0.1 V
scope to check
point pin 4 of J8.
ADJUSTMENT
POINT
VALUE
UNIT ADJUST
TUNER
J8
6
1
J6
J15
J13
C7
Impedance detector
adjustment
R194
Phase detector
adjustment
R56
C7
Verify
Verify