ELECRAFT 49
Sort all of the remaining capacitors by value to reduce the
possibility of assembly errors in the next step. If you are unsure of
any capacitor’s value and do not have a capacitance meter, the
pictures in the parts list (Appendix A) may help.
Install the following capacitors, starting with C86 in the front-
left corner. Integer values are in pF and fractional values are in µF.
__ C86, 0.1 (104) ⇒ __ C84, 120 (121) ⇒ __ C85, 120 (121)
__ C100, .001 (102) __ C95, .01 (103) __ C96, 1 µF (105)
__ C71, 82 (82) __ C72, 270 (271) __ C73, 47 (47)
__ C74, 20 (20)
__ C82, .001 (102) __ C80, .001 (102) __ C81, .001 (102)
__ C79, .001 (102) __ C59, 0.1 (104) __ C38, .001 (102)
__ C55, .01 (103) __ C61, .01 (103) __ C58, .01 (103)
__ C65, 0.1 (104) __ C54, .01 (103)
__ C68, 10 pF (10) __ C64, .001 (102) __ C67, 0.1 (104)
__ C63, .01 (103) __ C92, .022 (223) __ C94, 0.047 (473)
__ C89, .001 (102) __ C87, .01 (103) __ C175, .01 (103)
__ C62, .01 (103) __ C154, 100 (101) __ C144, 100 (101)
__ C156, .047 (473) __ C158, .01 (103) __ C53, .01 (103)
__ C52, .01 (103) __ C141, .01 (103) __ C57, .001 (102)
__ C146, .01 (103) __ C151, 0.1 (104) __ C145, .01 (103)
__ C153, 68 (68) __ C155, .01 (103) __ C172, .01 (103)
__ C177, .022 (223) __ C174, 82 (82) __ C173, 220 (221)
__ C178, 0.1 (104) __ C176, 0.1 (104) __ C165, .01 (103)
__ C169, 390 (391) __ C168, .01 (103) __ C160, .01 (103)
__ C159, .01 (103) __ C143, .01 (103) __ C142, .01 (103)
__ C163, .01 (103) __ C162, .047 (473) __ C164, .01 (103)
__ C170, .047 (473) __ C166, .047 (473) __ C179, 100 (101)
__ C182, 180 (181) __ C184, .01 (103)
__ C185, 0.1 (104) __ C181, .01 (103)
Install the following ICs, aligning the notched end of each IC
with the notch on its component outline. U6 is at the front-left.
__ U6, LMC662 ⇒ __ U5, LTC1451 ⇒ __ U4, MC145170
__ U3, LT1252 __ U10, NE602 __ U9, LT1252
__ U11, NE602 __ U12, MC1350
Install U8 (78L05), which has a plastic TO-92 package like a
transistor. U8 is located near the front left corner of the board.
Option-bypass jumpers W5, W2 and W3 are located on the
right side of the board, near the crystal filter. Use component leads
to make these jumpers, or remove the insulation from appropriate
lengths of green hookup wire. These jumpers should be formed so
that they lie flat on the board, and should not touch any adjacent
components.
Test points TP1, TP2, and TP3 are round, yellow, single-pin
female connectors. TP1 and TP3 can be found in the synthesizer
area of the board. TP2 is near the SSB option connector, J11.
Install and solder all three test points.
Install RF choke RFC13 (100 µH, BRN-BLK-BRN), near the middle of
the board. Orient the first color band to the left.
Install the receive mixer, Z6 (TUF-1), below the
"ELECRAFT" label at the middle of the board. Make sure that Z6
is lined up with its component outline and is flush with the board
before soldering.
Install the electrolytic capacitors in the order listed below,
starting with C60 near the far left-hand edge. Insert the (+) lead of
each capacitor into the hole with the (+) symbol.
__ C60, 100 µF __ C93, 10 µF __ C103, 220 µF
Install RFC15 (100 µH subminiature RF choke) and C91
(.001 µF) as explained in the manual errata sheet.
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