Elecraft T1 Assembly Manual User Manual
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Either wear a grounded anti-static wrist strap or touch an unpainted, grounded object before
handling the MCU (U1) in the next steps, or at any time you handle the boards with the MCU
installed.
Remove MCU U1 from its package or anti-static foam pad and inspect the pins. The two rows of pins
must be straight and parallel to each other to establish the proper pin spacing for insertion into the socket.
To straighten the pins, rest one entire row of pins against a hard, flat surface. Hold the body of the MCU
and rock it forward to bend the pins into position as shown in Figure 16.
FLARED
ROCK TO
STRAIGHTEN
STRAIGHT
DIMPLE AT
PIN 1
NOTCH
Figure 16. Installing the MCU.
Identify the end of the IC where Pin 1 is located. It will have a notch, a dimple or both at this end (See
Figure 16). Align the MCU on the socket with the notched or dimpled end of the MCU over the notched
end of the socket. Carefully inspect the alignment of each MCU pin and its corresponding socket. Pay
particular attention to the row of pins along the relays. Put a strong light on the relays and look under the
MCU with your magnifier to see the pins near the relays clearly. Be certain that all the pins are started
down into their respective socket positions before proceeding.
Press down firmly on the MCU while checking the pins for any that fail to slide into the socket
properly. Apply pressure alternately to one end and then to the other of the MCU as necessary to ensure the
pins go all the way into the socket. The shoulder on each pin must rest against the top of the socket.
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If you need to remove the MCU for any reason, see Removing the MCU on page 29.
Mate the control board on the main PC board, J4 to P1 and J5 to P2 (See Figure 7). The control board
must be oriented so Q1 and U2 are closest to the relays. Be sure that connectors J4-P1 and J5-P2 are fully
mated, with plastic housing touching plastic housing at both ends. Be certain that nothing on the bottom of
the control board touches the top of the MCU.