Icom IC-7800 Service Manual Addendum page 377

4-3 RXPLL-A UNIT ADJUSTMENTS
ADJUSTMENT ADJUSTMENT CONDITION
1 • MAIN display frequency
40M OUTPUT
• Mode
• Receiving
1 • MAIN display frequency
LPL LOCK
VOLTAGE
• Mode
• Receiving
2 • MAIN display frequency
• Mode
• Receiving
HPL LOCK 1 • MAIN display frequency
VOLTAGE
(VCO1) • Mode
• Receiving
(VCO2) 2 • MAIN display frequency
• Mode
• Receiving
(VCO3) 3 • MAIN display frequency
• Mode
• Receiving
4 • MAIN display frequency
(VCO4)
• Mode
• Receiving
(VCO5) 5 • MAIN display frequency
• Mode
• Receiving
(VCO6) 6 • MAIN display frequency
• Mode
• Receiving
(VCO1) 7 • MAIN display frequency
• Mode
• Receiving
(VCO2) 8 • MAIN display frequency
• Mode
• Receiving
9 • MAIN display frequency
(VCO3)
• Mode
• Receiving
(VCO4) 10 • MAIN display frequency
• Mode
• Receiving
(VCO5) 11 • MAIN display frequency
• Mode
• Receiving
MEASUREMENT
UNIT
RX
: 0.030 MHz PLL-A
: USB
RX
: 0.030 MHz PLL-A
: USB
: 7.999 MHz
: USB
RX
: 7.999 MHz PLL-A
: USB
: 14.999 MHz
: USB
: 21.999 MHz
: USB
: 29.999 MHz
: USB
: 44.999 MHz
: USB
: 60.000 MHz
: USB
RX
: 0.030 MHz PLL-A
: USB
: 8.000 MHz
: USB
: 15.000 MHz
: USB
: 22.000 MHz
: USB
: 30.000 MHz
: USB
4 - 4
LOCATION
Connect an RF volt- Maximum voltage
meter to CP701
(40 MHz).
Connect a DC volt-
meter to CP1 (LV1).
Less than 3.0 V
Connect a DC volt-
meter to CP2 (LV2).
Connect a DC volt-
meter to CP2 (LV2).
ADJUSTMENT
POINT
VALUE
UNIT
RX
PLL-A
2.0 V ±0.1 V RX
PLL-A
4.0 V ±0.1 V RX
PLL-A
4.0 V ±0.1 V
4.0 V ±0.1 V
4.0 V ±0.1 V
4.0 V ±0.1 V
4.0 V ±0.1 V
1.2 V–2.0 V RX
PLL-A
1.2 V–2.0 V
1.2 V–2.0 V
1.2 V–2.0 V
1.2 V–2.0 V
ADJUST
Adjust
repeatedly
L702,
L703
C154
Verify
C222
C232
C242
C252
C262
C272
Verify
Verify
Verify
Verify
Verify