Pll Unit Adjustment - Icom IC-7600 Service Manual

4-3 PLL UNIT ADJUSTMENT

ADJUSTMENT ADJUSTMENT CONDITION
VCO-A 1 • Frequency
LOCK • Mode
VOLTAGE • Receiving
2 • Frequency
• Mode
• Receiving
3 • Frequency
• Mode
• Receiving
4 • Frequency
• Mode
• Receiving
C208 C208
: 7.999999 MHz 1) Connect a Digital multimeter to
: USB CP301.
2) Adjust the lock voltage.
: 19.999999 MHz
: USB
: 44.9999999 MHz
: USB
: 60.000000 MHz
: USB
<Viewing from the BOTTOM side>
MAIN UNIT
CP301 CP301
VCO-A LOCK VOLTAGE VCO-A LOCK VOLTAGE
(CHECK POINT) (CHECK POINT)
C228 C228
VCO-A LOCK VOLTAGE VCO-A LOCK VOLTAGE
4 - 3
OPERATION
PLL UNIT
RF UNIT
C258 C258 C278 C278
ADJUSTMENT
VALUE
POINT
C278
C258
4.3 V
(4.2–4.4 V)
C228
C208
L
L