Rohde & Schwarz M3SR Series 4100, Service Manual, Page: 79 / 138

Function Test with Built-in Tests R&S M3SR Series 4100 HF Transceivers
3.3 6124.9007.82.01
3.2 Function Test with Built-in Tests
For operation of the transceiver two failure classes are defined, associated with the following types of
messages:
Warnings:
¾ Operation may go on even if warning messages are displayed.
¾ The radio should be checked as soon as possible.
¾ All active warnings are logged in the failure archive.
Errors:
¾ The radio is no longer in proper working order.
¾ As soon as an error is detected, the LED FAULT lights up.
¾ Error messages remain resident until the fault is eliminated and will be logged in the failure ar-
chive.
Performing Built-in Tests
Carry out the test steps in Table 3.2.
Table 3.2: Built-in Tests
No. Activity Nominal Value
1 PBIT (Power-on Built-In Test)
1.1 Connect a 28 VDC power supply to connector contacts
X31.A1 (+) and X31.A2 (ground).
NOTE:
Note that a 28 VDC supply voltage is available at antenna
connector X30.
Connect a load (50 Ω , > 100 W) to antenna connector X30.
Connect a mating connector to connector X26 with short-cir-
cuit of pins X26.6 and X26.44.
If no R&S GB 4000C Comfort Control Unit is installed, con-
nect one to LAN connector X20. Connect R&S GB 4000C to
transceiver via default address on MMI choosing Connect
and Enter button.