Icom IC-756PROII Service Manual page 23

PLL ADJUSTMENTS—continued
ADJUSTMENT ADJUSTMENT CONDITION
S2LO 1 • Display frequency: Any
OUTPUT • Receiving
LEVEL
MARKER 1 • Display frequency: Any
• Receiving
OUTPUT
LEVEL
• PLL unit
PLL unit
Bottom view of the transceiver
LVB
VCO-B lock voltage
check point
P651
1LO-B output level
check point
C508
C528
VCO-B
lock voltage
adjustment
C558
C578
C454
LPL-B lock voltage
adjustment
LPB
LPL-B lock voltage
check point
P901
S2LO output level
check point
P801
3LO output level
check point
P701
S3LO output level
check point
MEASUREMENT
UNIT LOCATION
PLL Connect an RF volt-
meter to the check
point P901.
PLL Connect an oscillo-
scope to the check
point P851.
4 - 3
ADJUSTMENT
POINT
VALUE
UNIT
–3 dBm or more
4 Vp-p or more
R33
Reference
frequency
adjustment
LVA
VCO-A lock voltage
check point
P361
1LO-A output level
check point
C278
C258
VCO-A
lock voltage
adjustment
C228
C208
C154
LPL-A lock voltage
adkustment
P851
Marker output level
check point
LPA
LPL-A lock voltage
check point
L52
Reference
L81
frequency
adjustment
L82
P81
Reference frequency
check point
ADJUST
Verify
Verify