72 Installation Note N5222-90131
Description of the Upgrade
Installation Procedure for the Upgrade
-
Step 40. Install/Reinstall the A71–74 Bias-Tee combiner’s Gray Low
Frequency Extension (LFE) DC Bias Cables and Route Cables
This step contains the following:
— “Install the A7–74 bias-Tee combiner’s blue Low Frequency Extension
(LFE) DC bias Cables” on page 72
— “Route Cables” on page 73
Install the A7–74 bias-Tee combiner’s blue Low Frequency Extension
(LFE) DC bias Cables
To see an image showing the location of these cables, refer to Figure 44 on
page 73. See also the Chapter 6 bookmarks “Bottom Ribbon Cables and Wire
Harnesses, 2-port, Option 205, S/N Prefixes ≥6021” in the PDF Service Guide
1
.
New parts are listed in Table 2 on page 11.
1. Connect/Reconnect A71 and A74 gray DC cables to the test set
motherboard (TSMB) as follows:
—
①—(Reuse)(N5240-60091) A19 test set motherboard J541 to A71
port 1 bias-T combiner
—
➁—(N5240-60091) A19 test set motherboard J543 to A72 port 3
bias-T combiner
—
➂—(N5240-60091) A19 test set motherboard J544 to A73 port 4
bias-T combiner
—
➃—(Reuse)(N5240-60091) A19 test set motherboard J542 to A74
port 2 bias-T combiner
1. See “Downloading the Online PNA Service Guide” on page 8.
IMPORTANT! The N5240-60091 (x4) bias combiner cables only connect to
the DC bias of the Bias Tee Combiner.
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