Ten-Tec SSB-CW-AM Instruction Manual page 39

2-13. Install right-angle header P1 per Step 2-12.
2-14. Install right-angle header P2 per Step 2-12.
2-15. Install the 28-pin DIP socket supplied for the U2 PIC
microprocessor, with the notched end aligned per the notch
outlined on the board. Insert carefully, making sure all pins mate
their holes with no pin bent back under the socket. Use good
lighting and a clean solder tip to avoid making solder bridges.
Do NOT insert U2 until instructed to do so.
2-16. Install U4, type 74LS47N, making sure that its notched
or dotted end is oriented toward the right-side edge of the board
as designated by the notch outlined on the board.
2-17. Install U5, type BA618, making sure that its notched or
dotted end is oriented as outlined on the board.
2-18. Install U3, type MC145170P1, making sure that its
notched or dotted end is oriented as outlined on the board.
Solder U5 directly to the board; do not use a socket.
2-19. Slide voltage regulator U1, type 7805CT (or LM340T-
5), into its position as far as you can push it. Then bend it back
so that its heatsink and hole line up with the groundplane area
and mounting hole in the board. Later, a screw will be secured
through U1 to the aluminum side panel.
2-20. Solder and trim the 3 leads of voltage regulator U1.
Install the following ceramic disc capacitors:
2-21. Capacitor C5, 33 pF. (narrow lead spacing,
NOT the 33 pF capacitors used tor C21 ,C22, etc.).
2-22. Capacitor C20, .001
2-23. Capacitor
2-24. Capacitor
Review Table 1-
installing diodes D5, D6, and D7 in the following steps:
2-25. Install diode D5, type 1N4148, with correct cathode
polarity as outlined on the board.
2-26. Install 6.2V zener diode D6, type 1N753A, with correct
cathode polarity as outlined on the board.
2-27. Install 6.2V zener diode D7, type 1N753A, with correct
cathode polarity as outlined on the board.
(marked 102).
(marked 104).
1254 Assembly 18