Module Replacement R&S SMU200A
1007.9845.82 3.64 E-6
Replacing the Options Overvoltage Protection (B30, B35),
High Power (B31, B36), and Overvoltage Protection and
High Power (B32, B37)
Related Parts are Relay Control A1815, A2815 Relay K1820, K2820, K1825, K2825.
(See chapter 5, spare parts 1141.2057.01 list A1815, A2815, drawings 1141.2005.01, 1159.7444.01
(B30), 1159.8011.01 (B31), 1160.0256 (B32), 1160.0256.01 (B33), 1160.0633.01 (B35), 1160.1000
(B36), 1160.1400.01 (B37)
The board is fitted behind the RF input connector. Options B30, B31, B32 are mounted at the
instrument bottom; options B35, B36, B37 are mounted at the end in the air duct.
Removing the Module
Remove the instrument cover 1.
Place the instrument on its left side and unscrew the RF cable.
Remove the modules together with the brackets, circuit and relay (3 screws 1148.2869.00).
Disconnect the ribbon cable to the motherboard.
The removal of all the options is thus completed. If troubleshooting indicates a defective relay control
circuit or a defective relay, these components can be separately removed and replaced as follows:
Remove the relay control circuit A1815 by loosening the 3 screws M2.5 (1148.3059).
Note: Carefully unscrew other RF cables as necessary. Do not undo short RF cables completely on
one side (danger of bending or breaking the inner conductor).
Remove relay(s) K1820, K1825 by loosening the 2 screws (1148.2869).
Installing the New Module
Be sure, coding switches are set according to the option
Option Contact S0 Contact S1
B30, B35 (overvoltage protection) closed open
B31, B36 (high power) open closed
B32, B37 (both) closed closed
Reconnect the ribbon cable.
Reconnect the RF cable and mount the module or components in the reverse order.
Fix module with screws to the mounting.
Screw on RF cable.
Reinstall instrument cover 1.
After replacement, perform internal and external adjustments according to chapter 2, 'Adjustments'.
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