Repairs to the Express Orderwire Multidirection Unit consists of the replace-
ment of the plug-in printed wiring boards and the power supply, and their component
p a r t s . To remove a printed wiring board, grasp the front edge of the board and
carefully withdraw it from the mounting slot. When replacing a printed wiring board,
insert the board into the mounting slot and slide it into the mating connector. Make
sure that the board is positioned properly with relation to the mating connector. I f
the board cannot be inserted easily, it is incorrectly positioned. Withdraw the
board from the slot, invert it, and reinsert in the mating connector, Whenever
an amplifier or attenuator board is replaced, always check to verify proper adjust-
ment of the replacement; refer to the operational performance tests, paragraph 5.4.
C a u t i o n : The procedures set forth in TB SIG 222 should be followed when
replacing components on the printed circuit boards.