Pll Adjustment - Icom IC-R75 Service Manual

4-2 PLL ADJUSTMENT

ADJUSTMENT ADJUSTMENT CONDITION
1 • Displayed frequency
REFERENCE
FREQUENCY
• Mode
2
1 • Displayed frequency
VCO
VOLTAGE
• Mode
2 • Displayed frequency
• Mode
3 • Displayed frequency
• Mode
4 • Displayed frequency
• Mode: USB
1ST LO 1 • Displayed frequency
VOLTAGE
• Mode
3RD LO 1 • Displayed frequency
VOLTAGE
• Mode
3RD LO 1 • Displayed frequency
FREQUENCY
• Mode
BFO 1 • Displayed frequency
VOLTAGE
• Mode
2 • Displayed frequency
• Mode
*This output level of the standard signal generator (SSG) is indicated as SSG's open circuit.
MEASUREMENT
UNIT
PLL
: 29.99999 MHz
: USB
PLL
: 29.99999 MHz
: USB
: 0.03000 MHz
: USB
: 60.00000 MHz
: USB
: 30.00000 MHz
PLL
: 30–60.00000 MHz
: USB
PLL
: 30–60.00000 MHz
: USB
PLL
: 9.4615 MHz
: FM
PLL
: 14.100000 MHz
: USB
: 14.100000 MHz
: AM
LOCATION
Connect the fre- 60.00000 MHz
quency counter to
P1.
Connect the RF Maximum voltage
voltmater to P1.
Connect the DC 4.0 V
voltmeter to HCP71.
More than 0.8 V
4.0 V
More than 0.8 V
Connect the RF More than 0.18 V
voltmeter to P91.
Connect the RF More than 0.022 V
voltmeter to P91.
Connect the fre- 9.4614–9.4616 MHz
quency counter to
P151.
Connect the RF More than 0.022 V
voltmeter to P201.
Less than 280 µV
4 - 2
ADJUSTMENT
POINT
VALUE
UNIT ADJUST
PLL
PLL
PLL
L2
L4, L5
C86
Verify
C76
Verify
Verify
Verify
Verify
Verity