Icom IC-910H, Service Manual

Page: 74 / 144

*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit.
5 - 16
SOFTWARE ADJUSTMENT (continued)
ADJUSTMENT
ITEM (6)
RF PEAK
ADJUSTMENT
ITEM (7)
TX POWER/
METER
(for 144 M)
(for 1200 M)
ADJUSTMENT ADJUSTMENT CONDITION DISPLAY OPERATION
• Enter software adjustment mode (Refer
page 5-12).
• Push [6] key to enter the RF peak adjust-
ment for TX.
• Connect an RF power meter to [VHF ANT]
connector.
• Connect an SSG to P501 on the PA unit
via the JIG cable (A) and set as:
Frequency : 10.850 MHz
Level
: 18 mV* (–22 dBm)
Modulation : OFF
NOTE: While transmitting, adjust SSG’s
level and keep the output power less than
30 W.
• Enter software adjustment mode (Refer
page 5-12).
• Push [7] key to enter the TX power/meter
adjustment.
• Connect an RF power meter to [VHF ANT]
connector.
• Connect a digital multimeter or oscillo-
scope to check point CP1631.
1
2
3
4
1
2
3
4
5
6
Push [RIT] key to strat transmitting.
• Pushing [SET] key, tune the [MAIN
DIAL] to maximum.
• Adjust L501, L502 on the PA unit
(illustration for location page 5-9) to
maximum.
• Pushing [SET] key, tune the [MAIN
DIAL] to maximum, then push [RIT]
key to store peak setting into mem-
ory and to step next.
(1) Pushing [ATT] key, tune the
[MAIN DIAL] to maximum.
(2) Pushing [SET] key, tune the
[MAIN DIAL] to maximum.
(3) Repeat (1) and (2) several times
until output power will be peak,
then push [RIT] key to store peak
setting into memory and to step
next.
Same as step 3. Then turn power
OFF and ON to return the normal
operation mode. Then continue to
adjust from step 4 of the RF PEAK
adjustment (page 5-8).
Push [RIT] key to strat transmitting.
Tune the [MAIN DIAL] to 100 W
(High power). Push [RIT] key to
store the adjustment value into
memory, and to step next.
Tune the [MAIN DIAL] to 50 W
(Middle power). Push [RIT] key to
store the adjustment value into
memory, and to step next.
Verify the output power (Low power)
is 1–5 W, then push [RIT] key to step
next.
Push [RIT] key to strat transmitting.
Tune the [MAIN DIAL] to 3.0 V at the
check point CP1681. Push [RIT] key
to store the adjustment value into
memory, and to step next.
CW
CW
USB USB
USB USB
USB USB
USB USB
CW
CW
CW
CW