ELECRAFT 47
Assembly, Part II
In this section you’ll install the components for the synthesizer
and receiver circuits. Most of the components to be installed are on
the front half of the board (see Figure 6-1). After all of the parts
are installed, individual stages will be aligned and tested. Detailed
troubleshooting procedures are provided in the Troubleshooting
section should you need them (Appendix E). The supplied RF probe
will be very useful if you need to do signal tracing. RF probe
assembly instructions start on page 9 of Appendix E.
In some steps a large number of components will be installed, then
soldered as a group. Check for unsoldered leads after completing
each group. A final complete check will be done later.
Remove the screws holding the Control board to the Front
Panel board, then unplug the Control board. To avoid damaging any
Control board components, use the long-handled Allen wrench as
described in Part I.
Remove the bottom cover (six screws).
Remove the screws from the front panel assembly and unplug it
from the RF board. Pull it straight out from the bottom edge, near
the middle of the panel. This may be easier to do with the
transceiver sitting on its right side so that you can steady it with
one hand and pull with the other.
Remove the side panels by taking out the two screws along the
bottom edge of each panel.
Install the following 1/4-watt resistors, orienting them so that
the first band is at the left or toward the back of the board. The
resistors are listed in the order they appear on the RF board,
starting with R9 (near the left edge, about halfway back).
Note: Remember to complete each line of resistors before
proceeding to the next line (i.e., install R9, then R16, then R10).
__ R9, 100 k (BRN-BLK-YEL) ⇒ __ R16, 100 k (BRN-BLK-YEL)
__ R10, 470 (YEL-VIO-BRN) __ R31, 10 k (BRN-BLK-ORG)
__ R32, 10 k (BRN-BLK-ORG) __ R33, 15 k (BRN-GRN-ORG)
__ R30, 120 (BRN-RED-BRN) __ R28, 27 k (RED-VIO-ORG)
__ R20, 270 (RED-VIO-BRN) __ R21, 100 k (BRN-BLK-YEL)
__ R22, 3.3 M (ORG-ORG-GRN)
__ R25, 2.7 k (RED-VIO-RED) __ R24, 2.7 k (RED-VIO-RED)
__ R15, 33 (ORG-ORG-BLK) __ R14, 10 k (BRN-BLK-ORG)
__ R13, 10 k (BRN-BLK-ORG) __ R12, 560 (GRN-BLU-BRN)
__ R17, 100 k (BRN-BLK-YEL) __ R11, 560 (GRN-BLU-BRN)
__ R5, 2.7 k (RED-VIO-RED) __ R78, 22 (RED-RED-BLK)
__ R6, 100 (BRN-BLK-BRN) __ R7, 68 (BLU-GRY-BLK)
__ R8, 100 (BRN-BLK-BRN)
__ R92, 33 (ORG-ORG-BLK) __ R91, 820 (GRY-RED-BRN)
__ R93, 820 (GRY-RED-BRN)
__ R72, 470 (YEL-VIO-BRN) __ R95, 2.7 k (RED-VIO-RED)
__ R96, 2.7 k (RED-VIO-RED) __ R74, 47 (YEL-VIO-BLK)
__ R73, 2.7 k (RED-VIO-RED) __ R97, 33 (ORG-ORG-BLK)
__ R80, 680 (BLU-GRY-BRN) __ R81, 1.8 k (BRN-GRY-RED)
__ R79, 1.8 k (BRN-GRY-RED)
__ R82, 18 (BRN-GRY-BLK) __ R101, 10 k (BRN-BLK-ORG)
__ R107,100 k (BRN-BLK-YEL) __ R111 5.6 k (GRN-BLU-RED)
__ R112, 22 (RED-RED-BLK) __ R90, 470 (YEL-VIO-BRN)
__ R89, 100 (BRN-BLK-BRN) __ R88, 470 (YEL-VIO-BRN)
__ R84, 18 (BRN-GRY-BLK) __ R85, 150 (BRN-GRN-BRN)
__ R83, 4.7 ohms (YEL-VIO-GLD)
Install the resistor networks. Start with RP2, which is in the
front left-hand corner. Align the pin 1 mark on each resistor
network with the pin 1 end of its component outline.
__ RP2, 10 k, 8 pins (8A3.103G)
__ RP3, 10 k, 8 pins (8A3.103G)
__ RP6, 100 k, 8 pins (8A3.104G)
__ RP4, 100 k, 6 pins (6A3.104G)
__ RP5, 100 k, 6 pins (6A3.104G)
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