6'2 Pll Adjustment; Local Oscillator Adjustment - Icom IC-R7100 Service Manual

6·2 PLL ADJUSTMENT
MEASUREMENT
ADJUSTMENT
POINT
ADJUSTMENT
ADJUSTMENT CONDITIONS VALUE
UNIT LOCATION UNIT ADJUST
2nd LO 1 • Dtsptayed frequency: 512.000 MHz
PLL
Conneet a spectrum Maximum value
PLL
L36. L37
OUTPUT analyzer or RF (More Ihan - a dBm) L3B. L39
LEVEL voltmeter to
J5 . L47
2 • DtspIayed trequency: 511 .9999 MHz
Maximum v alue L42, l44
(More Ihan - 3d Bm)
Nore :
Walt a lew rnin utes after power
ON 10
pe rform eaeh adjustmenl.
2nd LO 1 • Displayed trequency: 511 .9999 MH z PLL Connee t a f requenc y 768.0000 MHz PLL C69
OUTPUT
counter 10 J S.
FREOUENCY
2
• Displayed frequency: 512.0000 MHz
256.0000 MHz
Verity
±100 Hz
IF 1
• Displayed l requency: 5 12.0000 MHz Connect a spectrum Max imum value L29. L25
an alyzer or RF (More Ihan - 3dBm) L26. L27
voltmeter to CP (L29
sld e).
DIA
ose
• Displayed frequency: 512.0000 MHz Conneet a spectrum
Maximum vafue
-
L11 .l1 2
1
FREOUENCY
analyzer or RF (More Ihan -18dBm)
voltmeter la CP (L19
-
stee).
151 LO
1 • Displayed frequency : 145.0000 MHz Conneet a frequency 923.7000 MHz R35
OUTPUT - M_ : FM
c ounte r 1 0 J4.
FREOUENCY
2
- Display frequency : 149.9999 MHz
923.6999 MHz R41
NOTE : Repe at ste ps 1. and 2 (several times).
•
6·3 LOCAL OSCILLATOR ADJUSTMENT
MEASUREMENT
ADJUSTMENT
POINT
ADJUSTMENT ADJUSTMENT CONDITIONS
VALUE
UNIT LOCATION UNIT ADJUST
3rd LO 1
- Displayed frequency: 145.0000 MH z
MAIN
Connect a trequency 10.2450 MHz MAIN C132
OUTPUT -Mode
: USB
counter 1 0 R21 7 (C93
FREQUENCY
slde).
BFO
1
- Displayed frequency: 145.0000 MHz Conneet a frequency 456.5 kHz 114
FREOUENCY - M_
: USB
counter 10 W29.
2
453.5 kHz C1Sl
6-2