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5 - 2
5-2 PLL ADJUSTMENTS
30.2 MHz
LEVEL
REFERENCE
FREQUENCY
144M LOCK
VOLTAGE
440M LOCK
VOLTAGE
MAIN BFO
LEVEL
SUB BFO
LEVEL
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT
LOCATION
UNIT
ADJUST
1
1
2
1
2
3
1
2
3
1
2
• Display frequency: Any
• Receiving
• Display frequency: Any
• Receiving
This adjustment must be performed
at 5 minutes later after power ON.
• Display frequency: 173.9800 MHz
• Mode
: USB
• Receiving
• Display frequency: 136.0200 MHz
• Receiving
• Display frequency: 155.0000 MHz
• Receiving
• Display frequency: 479.9800 MHz
• Mode
: USB
• Receiving
• Display frequency: 420.0200 MHz
• Receiving
• Display frequency: 450.0000 MHz
• Receiving
• Display frequency: Any
• Mode
:USB
• Receiving
• Sub display freq. : Any
• Mode
:USB
• Receiving
PLL
PLL
PLL
PLL
PLL
PLL
Connect an RF volt-
meter or spectram
analyzer to check
point J541.
Connect an RF volt-
meter or spectram
analyzer to check
point P551.
Connect a frequency
counter to check
point P551.
Connect a digital
multimeter or oscillo-
scope to check point
CP100.
Connect an RF volt-
meter to check point
P251.
Connect a digital
multimeter or oscillo-
scope to check point
CP300.
Connect an RF volt-
meter to check point
P421.
Connect an RF volt-
meter to check point
P601.
Connect an RF volt-
meter to check point
P701.
–10 dBm (or more than
–11.5 dBm, when R570
is in maximum posi-
tion.)
Maximum level
(–13 dBm to –7dBm)
60.400000 MHz
2.7 V
0.6 V to 1.6 V
–10 dBm to –4 dBm
3.4 V
0.5 V to 1.5 V
–16 dBm to –10 dBm
–11 dBm to –5 dBm
–11 dBm to –5 dBm
PLL
PLL
PLL
PLL
PLL
PLL
R570
Adjust in
sequence
L551, L552
s e v e r a l
times.
The trimmer
capacitor of
X512.
L193
Verify
Verify
C402
Verify
Verify
Verify
Verify
5-3 FREQUENCY ADJUSTMENT
FM TX-LO
FREQUENCY
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT
LOCATION
UNIT
ADJUST
1 • Display frequency: Any
• Mode
: FM
• Disconnect P501, P502 (PA unit)
from J51 and J52 on the MAIN unit.
• Apply no audio signals to [MIC]
connector.
• Transmitting
MAIN
Connect a frequency
counter to check
point CP51.
10.85000 MHz
MAIN
L255
After adjustment, connect P501, P502 (PA unit) to J51, J52 on the MAIN.
Содержание IC-910H
Страница 1: ...SERVICE MANUAL ADDENDUM CONTENTS PARTS LIST 1 BOARD LAYOUTS 23 SCHEMATIC DIAGRAM 33 Nov 2008 ...
Страница 26: ...Nov 2008 25 DISPLAY UNIT TOP VIEW The combination of top side and bottom side of this ...
Страница 33: ...Nov 2008 32 MAIN UNIT BOT VIEW The combination of top side and bottom side of this ...
Страница 41: ...SERVICE MANUAL VHF UHF ALL MODE TRANSCEIVER i910H ...
Страница 118: ...9 2 BOTTOM VIEW RIT BOARD BOTTOM VIEW VR A BOARD BOTTOM VIEW VR B BOARD ...
Страница 121: ...9 5 9 11 DISPLAY BOARD TOP VIEW 8 5 1 4 1 8 16 9 1 8 16 9 1 8 16 9 ...
Страница 124: ...9 8 BOTTOM VIEW PA UNIT 1 3 4 6 1 3 4 6 ...
Страница 126: ...9 10 BOTTOM VIEW PLL UNIT R341 MP11 ...
Страница 130: ...9 14 BOTTOM VIEW UX 910 MAIN UNIT 1 4 8 5 ...
Страница 144: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 13714HZ C1 2001 Icom Inc ...