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4 - 2
4-2 OSC UNIT ADJUSTMENTS
REFERENCE
OUTPUT
REF IN
OUTPUT
REF OUT
OUTPUT
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT
LOCATION
UNIT
ADJUST
1
2
3
• Set the OSC unit to the external ref-
erence mode on the set mode.
• MAIN display frequency
: 10.000 MHz
• Connect an SSG to J71 on the
OSC unit and set as;
Frequency
: 10.000 MHz
Level
: 71 mV* (–10 dBm)
Modulation
: OFF
• Terminates J73 with 50
Ω
.
• Receiving
• Receiving
• Terminates J72 with 50
Ω
.
• Receiving
• Set the OSC unit to the internal ref-
erence mode on the set mode.
• Receiving
• Terminates J73 with 50
Ω
.
• Receiving
• Terminates J72 with 50
Ω
.
• Receiving
OSC
OSC
OSC
Connect an RF volt-
meter to J72.
Connect an RF volt-
meter to J72.
Connect an RF volt-
meter to J73.
Connect an RF volt-
meter to J71.
Connect an RF volt-
meter to J72.
Connect an RF volt-
meter to J73.
Maximum voltage
0 dBm ±3.0 dB
0 dBm ±3.0 dB
–10.0 dBm ±3.0 dB
0 dBm ±3.0 dB
0 dBm ±3.0 dB
OSC
Adjust
repeatedly
L61,
L62
Verify
Verify
Verify
Verify
Verify
*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit.
Summary of Contents for IC-7800
Page 1: ...SERVICE MANUAL ADDENDUM CONTENTS PARTS LIST 1 BOARD LAYOUTS 65 VOLTAGE DIAGRAM 67 Dec 2009 ...
Page 79: ...SERVICE MANUAL ADDENDUM CONTENTS PARTS LIST 1 BOARD LAYOUTS 60 VOLTAGE DIAGRAM 64 Feb 2009 ...
Page 157: ...SERVICE MANUAL ADDENDUM CONTENTS PARTS LIST 1 BOARD LAYOUTS 57 VOLTAGE DIAGRAM 59 Aug 2008 ...
Page 245: ...SERVICE MANUAL ADDENDUM CONTENTS PARTS LIST 1 BOARD LAYOUTS 57 VOLTAGE DIAGRAM 59 Jul 2008 ...
Page 333: ...THE TRANSCEIVER i7800 SERVICE MANUAL S 14015HZ C1 2 Mar 2006 ...
Page 555: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 14015HZ C1 2 C 2004 2006 Icom Inc ...