![background image](http://html2.mh-extra.com/html/icom/ic-7851/ic-7851_servise-manual_4153040028.webp)
3-15
• ADJUSTMENT POINTS ON THE RF-A/RF-B UNIT
J1701
J2509
J2702
J3051
J3141
J3142
J3143
J3144
J3145
J3146
L2007
L2009
L2011
L2101
L2506
L3006
L3111
L3112
L3121
L3122
L3131
L3132
MP2501
MP3301
RL2001
RL2003
RL2004
RL2051
R2213
R2510
R2511
R3610
C3805
5
8
9
CP2201
MP3051
Aa
Mm
RF UNIT
rf-b
RF-A
MP2051
J1701
J2509
J2702
J3051
J3141
J3142
J3143
J3144
J3145
J3146
L2007
L2009
L2011
L2101
L2506
L3006
L3111
L3112
L3121
L3122
L3131
L3132
MP2501
MP3301
RL1101
RL1401
RL1501
RL2001
RL2003
RL2004
RL2051
R2213
R2510
R2511
R3610
C3805
5
8
9
CP2201
MP3051
Aa
Mm
DIGISEL
RF UNIT
rf-b
RF-A
MP2051
ADJUSTMENT
OPERATION
ADJUSTMENT
ITEM
VALUE
MAIN
50 MHz RX sensitivity
[ Total Gain A 50M
PRE OFF ref]
1
1) Push [F-3] (Gain A) several times until “Total Gain A 50M
PRE OFF ref” appears.
2) Set the SSG as:
• Frequency: 50.1515 MHz
• Level:
–10 dBµ
3) Rotate L2506 to adjust the voltage.
4) Push [F-3] (Exit).
• Returns to the RX adjustment menu.
L2506
(RF-A UNIT)
Maximum
audio level.
SUB
50 MHz RX sensitivity
[ Total Gain B 50M
PRE OFF ref]
1
1) Push [F-4] (Gain B) several times until “Total Gain B 50M
PRE OFF ref” appears.
2) Set the SSG as:
• Frequency: 50.1515 MHz
• Level:
–10 dBµ
3) Rotate L2506 to adjust the voltage.
4) Push [F-3] (Exit).
• Returns to the RX adjustment menu.
L2506
(RF-B UNIT)
Maximum
audio level.
• RX ADJUSTMENTS (continued)