User guide

9
2-76 Re-route the 14-pin DIP ribbon cable from the keyboard (that used to go to the
motherboard A1J1) to the LCD Kit’s A1A21 Plotter board socket labeled
“FRONT PANEL” (figure 6).
2-77 Connect the 14-pin DIP ribbon cable (W6 included in the kit) to the motherboard
A1J1, observing polarity. The W6 ribbon should come off the forward side of the
connector, AND pin-1 should go towards the left as viewed from the front.
2-78 Connect the other end of the 14-pin DIP cable W6 to the LCD Kit’s A1A21
Plotter board socket labeled “MOTHERBOARD”, ensuring cable pin-1 matches
to A1A21 pin-1 (figure 6).
2-79 Re-connect the remaining front panel cables to the 85662A by connecting the 50-
pin ribbon cable to the keyboard and the remaining 14-pin DIP cable from the
keyboard to A3J1.
2-80 Connect cable W2 from the A3A4 board to its RJ-45 socket on the A1A21 board.
2-81 Fit the front panel assembly back into the frame and install the eight frame screws
that were removed in step 2-11 and the motherboard centerline support screw that
was removed in step 2-12.
2-82 Replace the side and bottom covers and turn the 85662A right side up.
2-83 Plug cable W3, 4-pin polarized 23V power connector into A1A21J8.
2-84 Turn the front panel intensity knob fully clockwise.
2-85 Re-connect the 85662A to the spectrum analyzer RF section, interconnect cables,
and AC power.
2-86 Turn on spectrum analyzer and verify correct operation.
2-87 Perform section IV Fast Sweep Adjustments.
2-88 Replace top cover.
2-89 Place the retrofit kit’s CD instruction manual in front of your HP service manual
as supplemental data.
Figure 6: Front Panel with LCD
Pin-1
J8