Icom IC-7410 Service Manual - Page 20

Adjustments On The Pll Unit, Tx 3rd Lo Level

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4-2 ADJUSTMENTS ON THE PLL UNIT ADJUSTMENT ITEM REFERENCE FREQUENCY SIGNAL TRANSCEIVER'S CONDITION 1 • Frequency: 14.10000 MHz • Mode: USB • Transmitting 2 • Frequency: 14.10000 MHz • Mode: USB • Receiving 3 OPERATION MEASURE POINT • Connect a frequency counter to J571 J571. ADJUST POINT (Verify) VALUE 64.000000 MHz (±300 Hz) • Connect an RF voltmeter to J571. J571 L551, L552 Max. voltage (Repeatedly) - -10 dBm (±3 dB) (Verify) LOCK VOLTAGE • Frequency: 14.10000 MHz • Connect a voltmeter to CP221. • Receiving 1ST LO LEVEL 1 • Frequency: 0.1 MHz* • Connect an RF voltmeter to J501. 1.8 MHz** • Receiving 2 • Frequency: 4.0 MHz* 3.5625 MHz** • Receiving 3 • Frequency: 7.9 MHz* 7.1 MHz** • Receiving 4 • Frequency: 8.0 MHz* 10.1 MHz** • Receiving 5 • Frequency: 15.0 MHz* 14.35 MHz** • Receiving 6 • Frequency: 21.9 MHz* 21.45 MHz** • Receiving 7 • Frequency: 22.0 MHz* 24.89 MHz** • Receiving 8 • Frequency: 50.0 MHz • Receiving 9† • Frequency: 54.0 MHz • Receiving RX 2ND LO LEVEL • Receiving • Connect an RF voltmeter to the J852. TX 3RD LO LEVEL • Transmitting • Connect an RF voltmeter to the J851. CODEC CLOCK LEVEL • Receiving • Connect an RF voltmeter to the J601. *: For all models except [TPE] and [KOR]. **: For [TPE] and [KOR]. †: Except [TPE]. CP221 J501 J852 J851 J671 (Verify) 1.0-4.0 V (Verify) +4 dBm (±3 dB) (Verify) (Verify) (Verify) -10 dBm (±3 dB) -12 dBm (±3 dB) 4 - 2

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4 - 2
4-2 ADJUSTMENTS ON THE PLL UNIT
ADJUSTMENT ITEM
TRANSCEIVER'S
CONDITION
OPERATION
MEASURE
POINT
ADJUST
POINT
VALUE
REFERENCE
FREQUENCY
SIGNAL
1
• Frequency: 14.10000 MHz
• Mode: USB
• Transmitting
•
Connect a frequency counter to
J571.
J571
(Verify)
64.000000 MHz
(±300 Hz)
2
• Frequency: 14.10000 MHz
• Mode: USB
• Receiving
•
Connect an RF voltmeter to J571.
J571
L551, L552
(Repeatedly)
Max. voltage
3
–
–10 dBm (±3 dB)
(Verify)
LOCK VOLTAGE
• Frequency: 14.10000 MHz
• Receiving
•
Connect a voltmeter to CP221.
CP221
(Verify)
1.0–4.0 V
1ST LO LEVEL
1
• Frequency:
0.1 MHz*
1.8 MHz**
• Receiving
•
Connect an RF voltmeter to J501.
J501
(Verify)
+4 dBm (±3 dB)
2
• Frequency:
4.0 MHz*
3.5625 MHz**
• Receiving
3
• Frequency:
7.9 MHz*
7.1 MHz**
• Receiving
4
• Frequency:
8.0 MHz*
10.1 MHz**
• Receiving
5
• Frequency:
15.0 MHz*
14.35 MHz**
• Receiving
6
• Frequency:
21.9 MHz*
21.45 MHz**
• Receiving
7
• Frequency:
22.0 MHz*
24.89 MHz**
• Receiving
8
• Frequency:
50.0 MHz
• Receiving
9
†
• Frequency: 54.0 MHz
• Receiving
RX 2ND LO LEVEL
• Receiving
•
Connect an RF voltmeter to the J852.
J852
(Verify)
–10 dBm
(±3 dB)
TX 3RD LO LEVEL
• Transmitting
•
Connect an RF voltmeter to the J851.
J851
(Verify)
CODEC CLOCK LEVEL
• Receiving
•
Connect an RF voltmeter to the J601.
J671
(Verify)
–12 dBm (±3 dB)
*: For all models except [TPE] and [KOR].
**: For [TPE] and [KOR].
†
: Except [TPE].