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Installation Procedure for the Upgrade
2. If not already done in a previous step, install the following new ribbon
Step 26. Replace the Front Panel's Lower Dress Panel
Before the front panel's lower dress panel can be replaced, the 2-port lower
dress panel and the lower front panel label must be removed from the front
panel assembly. Refer to
on page
1. Remove the 2-Port lower front panel label (item
2. Remove the 10 screws (save the screws for reuse) from the 2-port dress
3. Reassemble the front panel's lower dress panel assembly with the new
IMPORTANT! To avoid possible damage to the lower front panel overlay,
do not attempt to attach the lower front panel label until
the Overlay" on page
32
cables and wire harness in the order listed. To see an image showing their
locations, click the Chapter 6 bookmark "Bottom Ribbon Cables and Wire
Harnesses, 4-Port, Option 422" in the PDF Service Guide
listed in
Table 1 on page
— Ribbon cable, N5247-60015 from A23 test set motherboard J552 to
A28 mixer brick (2) J52
— 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 (part of mechanical switch assembly), A23 test set
motherboard J103 to A48 port 4 mechanical switch
— Wire harness (reuse) (N5225-60001), A23 test set motherboard
J221 to ports 1/3 LED board J1
— Wire harness (reuse) (N5225-60001), A23 test set motherboard
J222 to ports 2/4 LED board J1
9.
panel and remove the dress panel (item
4-port lower dress panel (N5240-00009) by reversing the order of step 2 in
the instructions previously followed.
33.
1. See
"Downloading the Online PNA Service Guide" on page
9.
Figure 13 on page
33. New parts are listed in
➁
and
1
. New parts are
Table 1
➀
).
➂
respectively).
"Step 28. Install
6.
Installation Note N5245-90121
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