Icom IC-7600 Service Manual page 23

C208
4-3 PLL UNIT ADJUSTMENT (continued)
ADJUSTMENT ADJUSTMENT CONDITION
LPL B 1 • Frequency
LOCK
VOLTAGE • Mode
• [DUALWATCH] : "ON"
• Receiving
VCO-B 1 • Frequency
LOCK
VOLTAGE • Mode
• Receiving
2 • Frequency
• Mode
• Receiving
3 • Frequency
• Mode
• Receiving
4 • Frequency
• Mode
• Receiving
C5788 C5788
LPL B LOCK VOLTAGE LPL B LOCK VOLTAGE
(CHECK POINT) (CHECK POINT)
CP401 CP401
LPL B LOCK VOLTAGE LPL B LOCK VOLTAGE
C228
: 0.030000 MHz 1) Connect a Digital multimeter to
(Sub band) CP401.
: USB 2) Adjust the lock voltage.
VCO-A LOCK VOLTAGE
: 7.999999 MHz 1) Connect a Digital multimeter to
(Sub band) CP601.
: USB 2) Adjust the lock voltage.
: 19.999999 MHz
(Sub band)
: USB
: 44.9999999 MHz
(Sub band)
: USB
: 60.000000 MHz
(Sub band)
: USB
<Viewing from the BOTTOM side>
PLL
UNIT
MAIN UNIT
VCO-B LOCK VOLTAGE VCO-B LOCK VOLTAGE
C558 C558
C454 C454
4 - 4
C258 C278
OPERATION
RF UNIT
C528 C528
CP601 CP601
VCO-B LOCK VOLTAGE VCO-B LOCK VOLTAGE
(CHECK POINT) (CHECK POINT)
ADJUSTMENT
VALUE
POINT
2.0 V
C454
(1.9–2.1 V)
C578
C558
4.3 V
(4.2–4.4 V)
C508
C528
C508 C508
L61
L61