User manual YAESU FT-840

[. . . ] Attempts by non-qualified persons to service this equipment may result in permanent damage not covered by the warranty, and may be illegal in some countries. Two PCB layout diagrams are provided for each double-sided circuit board in the transceiver. Each side of thr board is referred to by the type of the majority of components installed on that side ("leaded" or "chip-only"). In most cases one side has only chip components, and the other has either a mixture of both chip and leaded components (trimmers, coils, electrolytic capacitors, ICs, etc. ), or leaded components only. [. . . ] Tune the "Right" band frequency to 440. 050 MHz, then set the Transmit Power Level to "LOW. " 3. Press and hold in the in the "Left" DIAL knob to set the Alignment parameter to "A-2 PWR. xxH. " 4. Press the PTT switch to activate the transmitter, and adjust the "Left" DIAL knob, as needed, so that the wattmeter reading is 5 Watts (±0. 5 Watt). Increase the Transmit Power Level to "MID2. " 6. Press the PTT switch to activate the transmitter, and adjust the "Left" DIAL knob, as needed, so that the wattmeter reading is 10 Watts (±0. 5 Watt). Increase the Transmit Power Level to "MID1. " 8. Press the PTT switch to activate the transmitter, and adjust the "Left" DIAL knob, as needed, so that the wattmeter reading is 20 Watts (±0. 5 Watt). Increase the Transmit Power Level to "HIGH. " 10. Press the PTT switch to activate the transmitter, and adjust the "Left" DIAL knob, as needed, so that the wattmeter reading is 35 Watts (±0. 5 Watt). Tune the "Right" band frequency to 146. 050 MHz, then set the Transmit Power Level to "LOW. " 12. Press the PTT switch to activate the transmitter, and adjust the "Left" DIAL knob, as needed, so that the wattmeter reading is 5 Watts (±0. 5 Watt). Tune the "Left" band frequency to 52. 050 MHz, then activate DCS with the 023 DCS code, and set the Transmit Power Level to "LOW. " 9. Press the PTT switch to activate the transmitter (with no microphone input), and adjust the "Right" DIAL knob, as needed, so that the deviation meter reading is between 0. 65 kHz and 0. 75 kHz. Tune the "Left" band frequency to 29. 050 MHz, then activate DCS with the 023 DCS code, and set the Transmit Power Level to "LOW. " 11. Press the PTT switch to activate the transmitter (with no microphone input), and adjust the "Right" DIAL TX Deviation (A-4 DEV) 1. Press the "Sub" band DIAL knob momentarily, if needed, to switch the "Main" band to be the "Right" band. Tune the "Right" band frequency to 440. 050 MHz, then set the Transmit Power Level to "LOW. " 3. Press and hold in the in the "Left" DIAL knob to set the Alignment parameter to "A-4 DEV. xxH. " 4. Inject a 1 kHz audio tone at a level of 80 mV from the Audio Generator. 13 Alignment knob, as needed, so that the deviation meter reading is between 0. 35 kHz and 0. 45 kHz. CTCSS Tx Deviation (A-6 CTC) 1. Press the "Sub" band DIAL knob momentarily, if needed, to switch the "Main" band to be the "Right" band. Press and hold in the in the "Left" DIAL knob to set the Alignment parameter to "A-6 CTC. xxH. " 3. Tune the "Right" band frequency to 440. 050 MHz, then activate the CTCSS Encoder with a 100 Hz tone, and set the Transmit Power Level to "LOW. " 4. [. . . ] LOT 111111111111111111111111111111111111111111111111111111111111111111111111111SIDE LAY ADR A C3 A C3 A C3 A C4 A B4 A C4 A C4 A C4 B e4 A C4 B e4 B e4 B e4 B e4 A C4 A C4 A C4 A C4 B c5 B c5 B c5 B c5 B c5 B c5 B d4 B d5 B d5 B d5 B d5 B d4 B c5 B c5 B d5 B c5 B c5 B c5 B c5 B c5 B c5 B c5 B c5 B c5 B c5 B d5 B d5 B d5 B d4 B c5 B d5 B d4 B d5 A D5 A C4 B d4 B d4 B d4 B d4 B d4 B d4 B d4 B d4 B d4 A C4 A C4 A C4 A D4 A D4 A C4 A C4 B d4 B d4 B d4 B d4 B d4 B d4 42 MAIN Unit Parts List REF R 1539 R 1540 R 1541 R 1542 R 1543 R 1544 R 1545 R 1546 R 1547 R 1548 R 1549 R 1550 R 1551 R 1552 R 1553 R 1554 R 1555 R 1556 R 1559 R 1560 R 1561 R 1562 R 1563 R 1564 R 1565 R 1566 R 1567 R 1568 R 1569 R 1570 R 1573 R 1574 R 1575 R 1576 R 1577 R 1578 R 1579 R 1580 R 1581 R 1582 R 1583 R 1584 R 1585 R 1586 R 1587 R 1588 R 1589 R 1590 R 1591 R 1592 R 1593 R 1594 R 1595 R 1596 R 1597 R 1598 R 1599 R 1600 R 1601 R 1602 R 1603 R 1604 R 1605 R 1607 R 1608 R 1609 R 1610 R 1611 R 1612 R 1613 R 1614 R 1615 R 1617 R 1618 R 1619 R 1620 DESCRIPTION CHIP RES. VALUE 220 1k 33k 220 47 100k 10k 2. 2k 15k 22k 680 100 820 33k 100k 100 4. 7k 3. 3k 220 2. 2k 15k 22k 1k 220 1k 33k 100 100 47 100k 10k 2. 2k 100 470k 39k 560 2. 2k 15k 22k 680 47 1k 1k 33k 1k 47 1k 2. 2k 15k 22k 680 47 1k 33k 100 470k 1k 220 68 10k 10k 10k 10k 82 82 22k 22 10k 10k 10k 10k 22 22k 10k 10k 10k V/W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/2W 1W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W TOL. 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 0. 5% 0. 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% MFR'S DESIG RMC1/16S 221JTH RMC1/16S 102JTH RMC1/16S 333JTH RMC1/16S 221JTH RMC1/16S 470JTH RMC1/16S 104JTH RMC1/16S 103JTH RMC1/16S 222JTH RMC1/16S 153JTH RMC1/16S 223JTH RMC1/16S 681JTH RMC1/16S 101JTH RMC1/16S 821JTH RMC1/16S 333JTH RMC1/16S 104JTH RMC1/16S 101JTH RMC1/16S 472JTH RMC1/16S 332JTH RMC1/16S 221JTH RMC1/16S 222JTH RMC1/16S 153JTH RMC1/16S 223JTH RMC1/16S 102JTH RMC1/16S 221JTH RMC1/16S 102JTH RMC1/16S 333JTH RMC1/16S 101JTH RMC1/16S 101JTH RMC1/16S 470JTH RMC1/16S 104JTH RMC1/16S 103JTH RMC1/16S 222JTH RMC1/16S 101JTH RMC1/16S 474JTH RR0510R-393-D RR0510P-561-D RMC1/16S 222JTH RMC1/16S 153JTH RMC1/16S 223JTH RMC1/16S 681JTH RMC1/16S 470JTH RMC1/16S 102JTH RMC1/16S 102JTH RMC1/16S 333JTH RMC1/16S 102JTH RMC1/16S 470JTH RMC1/16S 102JTH RMC1/16S 222JTH RMC1/16S 153JTH RMC1/16S 223JTH RMC1/16S 681JTH RMC1/16S 470JTH RMC1/16S 102JTH RMC1/16S 333JTH RMC1/16S 101JTH RMC1/16S 474JTH RMC1/16S 102JTH RMC1/2 221JCTP RMC1 680JTE RMC1/16S 103JTH RMC1/16S 103JTH RMC1/16S 103JTH RMC1/16S 103JTH RMC1/16S 820JTH RMC1/16S 820JTH RMC1/16S 223JTH RMC1/16S 220JTH RMC1/16S 103JTH RMC1/16S 103JTH RMC1/16S 103JTH RMC1/16S 103JTH RMC1/16S 220JTH RMC1/16S 223JTH RMC1/16S 103JTH RMC1/16S 103JTH RMC1/16S 103JTH VXSTD P/N J24189017 J24189025 J24189043 J24189017 J24189009 J24189049 J24189037 J24189029 J24189039 J24189041 J24189023 J24189013 J24189024 J24189043 J24189049 J24189013 J24189033 J24189031 J24189017 J24189029 J24189039 J24189041 J24189025 J24189017 J24189025 J24189043 J24189013 J24189013 J24189009 J24189049 J24189037 J24189029 J24189013 J24189057 J24189157 J24189113 J24189029 J24189039 J24189041 J24189023 J24189009 J24189025 J24189025 J24189043 J24189025 J24189009 J24189025 J24189029 J24189039 J24189041 J24189023 J24189009 J24189025 J24189043 J24189013 J24189057 J24189025 J24275221 J24305680 J24189037 J24189037 J24189037 J24189037 J24189012 J24189012 J24189041 J24189005 J24189037 J24189037 J24189037 J24189037 J24189005 J24189041 J24189037 J24189037 J24189037 VERS. LOT 1111111111111111111111111111111111111111111111111111111111111111111111111111SIDE LAY ADR B d4 B d4 B d4 A C4 A D4 A D4 A C4 A D5 A D5 A D5 A D5 A D5 A D5 A D5 A E5 A E5 B e4 A D5 A D5 A D5 A D5 A D5 A D5 A D5 A D5 A D5 B c5 B c5 A E5 A E5 B c5 B c4 B c4 B c4 B d4 B c4 B c5 B c4 B c4 B c4 B c4 B c4 A D5 B c4 A E5 A D4 B c5 B c4 B c4 B c4 B b4 B c5 B c5 B b5 A E5 A E5 A D4 B d3 B b2 B b2 B b2 B b2 B b2 A F3 B a1 B b1 B b4 B b1 B b2 B b2 B a1 B b4 B c3 B b3 B b3 B c2 43 MAIN Unit Parts List REF R 1621 R 1622 R 1623 R 1624 R 1625 R 1626 R 1627 R 1628 R 1629 R 1630 R 1631 R 1632 R 1633 R 1634 R 1635 R 1636 R 1637 R 1638 R 1639 R 1640 R 1641 R 1650 R 1651 R 1652 R 1654 R 1655 R 1656 R 1657 R 1658 R 1664 R 1665 R 1666 R 1667 R 1668 R 1669 R 1670 R 1671 R 1672 R 1673 R 1674 R 1675 R 1676 R 1677 R 1678 R 1679 R 1680 R 1681 R 1682 R 1683 R 1684 R 1685 R 1686 R 1687 R 1688 R 1689 R 1690 R 1691 R 1692 R 1693 R 1694 R 1695 R 1696 R 1697 R 1698 R 1699 R 1700 R 1701 R 1702 R 1703 R 1704 R 1705 R 1706 R 1707 R 1708 R 1709 R 1710 DESCRIPTION CHIP RES. 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