Pa And Front Units Adjstment - Icom IC-PW1 Service Manual

4-2 PA AND FRONT UNITS ADJUSTMENT
Idling current must be taken out the PA unit from the main body.
ADJUSTMENT ADJUSTMENT CONDITION
IDLING
1 • [POWER] switch
CURRENT
• Pre-set R9 and R10 on the PA1
board to maximum counterclock-
wise position.
• [POWER] switch
• [AMP] switch
• Exciter frequency
• Mode
• Apply no audio signal to the
[MICROPHONE] connector.
• Connect the lead of L6 to ground.
• Transmitting.
2 • Disconnect the lead of L6 from
ground.
• Connect the lead of L5 to ground.
• Transmitting.
3 • Disconnect the lead of L5 from
ground.
• Connect the lead of L6 to ground.
4 • Same adjustments as steps 1–4 for PA2–PA4 boards.
1
METER • [POWER] switch
MAXIMUM • Connect
POINT [REMOTE] jack, then while push-
ing the [ANT] switch, turn power
ON.
• METER-1
• METER-2
2
UNIT
: OFF Front
panel
: ON
: ON
: 14.1 MHz
: USB
Front
panel
: OFF Controller
the terminator to
: [P ] scale
O
: [V ] scale
D
MEASUREMENT
LOCATION
Connect the DC 100 mA
ammeter to the HV
line between PA1
board and the
power supply unit.
Connect the DC 200 mA
ammeter to the HV
line between PA1
board and the
power supply unit.
100 mA
[METER-1] Set as below :
[METER-2] Set as below :
4 - 2
ADJUSTMENT
VALUE
UNIT
PA1
PA1
SW
1.5 k
250 500
100
1K
0 1.5K
10 20 30 40
50
P
W
O 0 60
I A
D
HOT
TEMP
METER-1
60
30
20 40
10
50
0
60
3
2
1 1.5
V
D V
SWR
ALC adj
ALC
METER-2
POINT
ADJUST
R9
R10
R9
R56
R57