Pll Adjustment For Ic-F4/S - Icom IC-F3 Service Manual

5-6 PLL ADJUSTMENT for IC-F4/S

ADJUSTMENT ADJUSTMENT CONDITIONS
PLL LOCK 1 • Operating freq. :
VOLTAGE 400.000 MHz (L-band)
440.000 MHz (ML-band)
470.000 MHz (MH-band)
490.000 MHz (H1/H2-bands)
• Receiving
2 • Transmitting
3 • Operating freq. :
430.000 MHz (L-band)
470.000 MHz (ML-band)
500.000 MHz (MH-band)
512.000 MHz (H1-band)
520.000 MHz (H2-band)
• Receiving
4 • Transmitting
• MAIN unit
RF power meter
L11
PLL lock voltage
adjustment for RX
L405
PLL lock voltage
adjustment for TX
CP1
PLL lock voltage
check point
MEASUREMENT
UNIT LOCATION
MAIN Connect a multimeter
to check point CP1.
see detailed illustration
below
VR board
5 - 7
ADJUSTMENT
VALUE
UNIT ADJUST
1.3 V MAIN
2.5–4.2 V
(H1-band)
3.0–4.5 V
(other)
,
DC power supply
.
Power supply connection
connect (soldering)
, line here
L11
L405
Verify