Pll Adjustment - Icom IC-F31GS Servise Manual

5-2 PLL ADJUSTMENT

ADJUSTMENT ADJUSTMENT CONDITIONS
PLL LOCK 1 • Operating freq. : 136.000 MHz
VOLTAGE • Receiving
2 • Transmitting
3 • Operating freq. : 174.000 MHz
• Receiving
4 • Transmitting
• MAIN unit
C372
PLL lock voltage
adjustment for RX
C373
PLL lock voltage
adjustment for TX
MEASUREMENT
UNIT LOCATION
MAIN Connect a digital multi-
meter or an oscillo-
scope to the check
point, "LV".
5 - 4
ADJUSTMENT
VALUE
UNIT ADJUST
1.2 V MAIN C372
1.0 V C373
3.0–4.5 V Verify
LV
PLL lock voltage
check point