Sony DME-7000 Maintenance Manual

Also see for BKDM-3010: Operation manual Installation manual

3-4 (E)3-4. Replacement of Main Parts3-5. Replacement of Printed Circuit Boards3-4-3. Backup BatteryTo store a part of setup data and a real-time clock, Ni-Cdbatteries are installed on CPU-119 board in BKDM-3010.To charge the Ni-Cd batteries sufficiently, turn on thepower of DME-3000/7000 about ten hours. The sufficient-ly charged Ni-Cd batteries enable data to be stored forabout one week.nThe life of a Ni-Cd battery is about ten years. Replace theNi-Cd battery after a lapse of ten years since this unit isinstalled or the battery is last replaced. (For the replace-ment procedure of the battery, refer to the MaintenanceManual Part 2.)3-5. Replacement of Printed CircuitBoards3-5-1. CPU-119 Board1. Remove the bottom plate.(Refer to the section 3-2.)2. Remove the hexagonal cap screws securing the threeD-SUB connectors at the rear of the bottom plate.3. Remove the nine screws on the CPU-119 board, thenremove the board.4. Install a new CPU-119 board in the reverse order ofthe steps 1 through 3.HexagonalcapscrewsBVWH3 x 8BVWH3 x 8CPU-119 board BVWH3 x 8