This is service manual for R&S SLRD UHF power signal generator BN 41004. Edition "Ausgabe R 8691/1063" (german language only) includes schematic and alignment procedures, circuit description, parts list, operation instructions etc. Usable for BN 41004/50 (50 Ohm) and BN 41004/60 (60 Ohm), version with two separate instruments for grid and anode current, dezifix connector (some versions have N connector), motor driven frequency adjustment. This manual is not usable for BN 41004/2 which has a different circuit.