Service manual

5. DISASSEMBLY AND ASSEMBLY
Service Manual BSM-4100 5.13
2. Disconnect the 6 cables from the CN103, CN108, CN006 and CN121 to
CN123 sockets on the MAIN board. Remove the 4 screws which secure the
MAIN board and remove it.
Perform the following procedure after the “Removing the DPU Board” procedure.
1. Remove the 2 small screws (PS2.6 x 8) which secure the AUX socket of the
MAIN board to the DPU board holder. Remove the 4 screws which secure the
DPU board holder and remove it.
Removing the MAIN Board
NOTE
When the MAIN board is replaced with a new one, set the DIP switch
(SW001) on the new MAIN board as follows:
Recorder built-in type (BSM-4101/4102/4103/4104): Set Bit 3 to off.
No recorder type (BSM-4111/4112/4113/4114): Set Bit 3 to on.