5
10. Install the modem PCB onto the main PCB. See figures 6 and 7 below.
a. Align P1 on the modem PCB with J10 on the underside of the main PCB.
b. Insert the P1 pins into the J10 socket. If done correctly, the two standoffs on the modem PCB should insert through the
mounting holes in the main PCB.
c. Turn the PCB’s over so that the main circuit board is on top of the modem PCB. Secure the modem PCB to the main PCB by
adding the provided flat washers, split washers, and nuts onto the standoff(s). Tighten the nuts using a
C
/
zn
” nut driver.
CAUTION:
Torque the 4-40 nuts to 4.5 – 5.5 in. lbs. (.51 -.62 Nm). Excessive torque may damage the circuit boards. After installing
the modem, inspect for warped modem PCB or main PCB.
J10
Modem PCB
(Underside View)
P1
Modem PCB
Mounting Holes
Figure 6
Side View
J9
P1
Modem
J10
Modem PCB
Main PCB
CAUTION:
Do not over
torque the nuts. See
step 10 for limits.
!
J4
T1
C3
C1
Figure 7