Rohde & Schwarz M3SR Series 4100, Service Manual, Page: 98 / 138

R&S M3SR Series 4100 HF Transceivers Troubleshooting
6124.9007.82.01 4.6
4.2.2 Troubleshooting after Testing the Specification
In the case of deviations from the nominal values while testing the specification according to
3.3 - Function Test refer to Table 4.2 for fault diagnosis. The troubleshooting assumes that the
troubleshooting/fault removal with the Built-in Tests was previously carried out.
Replace the module(s) / device(s) concerred according to 5.1 - Disassembly and perform the test of
specification again.
Table 4.2: Fault Diagnosis
Failure in 3.3 - Function Test Module(s) / Device(s) to be Replaced
Test
Step Test
-2- MMI R&S GB 4000C R&S GB 4000C
Motherboard (10-Base-T Hub), Radio
Controller
-3- Receiver - Sensitivity in J3E Mode Frontend, Digital Selector (if installed)
-4- Receive State A3E - Display, Buttons, Switches
and Controls Check A3E RX mode, Display:
Frontend, Radio Controller
Buttons, switches and controls:
Front Panel, button, switch, control,
loudspeaker
-5- Squelch Function Frontend
LED SQL (Front Panel)
-6- Audio Interface / B8E Receive Front Panel, Motherboard
-7- Transmitter - Output Power Power Amplifier, if output power of
Frontend at X1 is 10 dBm ± 1.2 dB,
otherwise Frontend
Digital Selector, if installed. This can be
tested by connecting X313 to X314.
LED RF (Front Panel)
-8- Harmonic Emissions Power Amplifier
-9- Max. Current Consumption in Transmit State
Mode F3E Power Amplifier
-10- PTT Interface / Audio Matrix / B8E Transmit Motherboard