Pll Adjustment - Icom IC-F620 Service Manual

5-2 PLL ADJUSTMENT

ADJUSTMENT ADJUSTMENT CONDITIONS
PLL LOCK 1 • Operating freq. : 400.000 MHz
VOLTAGE
• Receiving
2 • Output power
• Transmitting
3 • Operating freq. : 430.000 MHz
• Receiving
4 • Output power
• Transmitting
C134
PLL lock voltage
adjustment for TX
UNIT
[L] MAIN Connect a digital multi-
440.000 MHz [M]
480.000 MHz [H]
: Low1
[L]
490.000 MHz [M]
520.000 MHz [H]
: Low1
5 - 3
MEASUREMENT
LOCATION
meter or an oscillo-
scope to the check
point, "LV".
3.0–4.2 V
3.3–4.5 V
3.3–4.5 V
DC power supply
13.2 (13.6) V / 20 A
ADJUSTMENT
VALUE
UNIT ADJUST
1.0 V MAIN C133
1.1 V C134
[L] Verify
[M]
[H]
LV
PLL lock voltage
check point
C133
PLL lock voltage
adjustment for RX