Adjustment Procedures - Icom IC-A24 Service Manual

5-2 ADJUSTMENT (continued)
ADJUSTMENT
MAX. 4 • Operating frequency: 127.500 MHz
MODULATION
(PRESET)
[ ]
5 • Operating frequency: 118.025 MHz
6 • Operating frequency: 136.975 MHz
move to
"IDLING CURRENT"
(for driver amp.)
IDLING 1 • Operating frequency: 127.500 MHz
CURRENT
(for driver amp.)
[ ]
2 • Operating frequency: 118.025 MHz
3 • Operating frequency: 136.975 MHz
4 • Operating frequency: 127.500 MHz
5 • Operating frequency: 118.025 MHz
6 • Operating frequency: 136.975 MHz
move to
"MAX MODULATION"
(for driver amp.)
MAX. 1 • Operating frequency: 127.500 MHz
MODULATION
[ ]
2 • Operating frequency: 118.025 MHz
3 • Operating frequency: 136.975 MHz
4 • Operating frequency: 127.500 MHz
5 • Operating frequency: 118.025 MHz
6 • Operating frequency: 136.975 MHz
move to
"SENSITIVITY"
ADJUSTMENT CONDITION
• Connect an 11 V power supply to the [DC 11V] jack.
• Transmitting
• Transmitting
• Transmitting
Push [MR] key 17 times. (Until you can fi nd [db])
• Connect a 7.2 V DC power supply to the battery terminal.
• Connect an audio generator to the [MIC] connector and set
as:
1 kHz/20 mVrms
• Set a modulation analyzer as:
HPF : OFF
LPF : 20 kHz
Detector : (P–P)/2
• Transmitting
• Transmitting
• Transmitting
• Connect an 11 V DC power supply to the [DC 11V] jack.
• Transmitting
• Transmitting
• Transmitting
Push [MR] key 5 times. (Until you can fi nd [d7])
• Connect a 7.2 V DC power supply to the battery terminal.
• Connect an audio generator to the [MIC] connector and set
as:
1 kHz/200 mVrms
• Set a modulation analyzer as:
HPF : OFF
LPF : 20 kHz
Detector : (P–P)/2
• Transmitting
• Transmitting
• Transmitting
• Connect an 11 V DC power supply to the [DC 11V] jack.
• Transmitting
• Transmitting
• Transmitting
Push [121.5] key once. (Skip [rS], and you can fi nd [t1])
• Rotate [DIAL] to set to 30% modulation.
• Rotate [DIAL] to adjust minimum distor-
tion.
• Push [ENT] key.
• Rotate [DIAL] to set to 30% modulation
• Push [ENT] key.
5 - 4
OPERATION