36 Installation Note N5245-90012
Installation Procedure for the Upgrade
-
2. If not already done in a previous step, install the following new ribbon
cables in the order listed. To see an image showing the location of these
cables, click the Chapter 6 bookmark “Bottom Ribbon Cables and Wire
Harnesses, 4-Port, Option 419” in the PDF Service Guide
1
. New parts are
listed in
.
— Ribbon cable, N5247-60015 from A23 test set motherboard J552 to A28
mixer brick (2) J52
— Ribbon cable (part of bias tee assembly), port 3 bias tee to A23 test set
motherboard J543
— Ribbon cable (part of bias tee assembly), port 4 bias tee to A23 test set
motherboard J544
— Ribbon cable (N5245-60026), A23 test set motherboard J206 to A47
port 3 receiver attenuator
— Ribbon cable (N5245-60026), A23 test set motherboard J207 to A48
port 4 receiver attenuator
— Ribbon cable (N5245-60006), A23 test set motherboard J547 to A39
port 3 source attenuator
— Ribbon cable (N5245-60006), A23 test set motherboard J548 to A40
port 4 source attenuator
— Wire harness (N5225-60001), A23 test set motherboard J221 to ports
1/3 LED board J1
—
Wire harness (N5225-60001), A23 test set motherboard J222 to ports
2/4 LED board J1
Step 28. Disassemble the 2-Port Front Panel and Assemble the 4-Port
Front Panel
Before the front frame can be replaced, the items making up the back side of
the front panel assembly must be removed. For instructions on removing these
items, click the Chapter 7 bookmark “Removing and Replacing the A1-A3 and
Other Front Panel Subassemblies” in the PDF Service Guide
. New parts are
listed in
.
1. In the section “Removing the A2 USB Board,” perform the only step.
2. In the section “Removing the A1 Front Panel Interface Board and Keypad
Assembly,” perform steps 1 - 5.
3. In the section “Removing the Power Switch Board and Power Button
Keypad,” perform only steps 1 and 2.
4. Remove the braided gasket from the backside edges of the 2-port front
frame and install it in the 4-port front frame (N5247-20141).
1. See
