Service manual

5. DISASSEMBLY AND ASSEMBLY
Service Manual BSM-4100 5.5
11. Remove the 4 screws which secure the lower chassis cover as shown below.
Carefully lift it up and disconnect the cable between the battery receptacle
terminal and MAIN board from CN021 on the MAIN board. Remove the lower
chassis cover.
10. Carefully lift the upper chassis cover up and disconnect the following cables
from the specified sockets. Remove the upper chassis cover.
• Disconnect the cable between the power supply unit and MAIN board from
CN105 socket on the MAIN board.
• Disconnect the cable between the AC inlet socket and DPU board from
CNJ031 socket on the DPU board. This cable has a toroidal core for line
frequency detection.
CAUTION
Pull the connector housing to disconnect the cable. If the cable is
pulled, the wires inside the cable can be cut near the connector.
NOTE in Assembling the Instrument
Make a note of how the cables are arranged in the instrument.