BEL 6110, Operator'S And Service Manual, Page: 28 / 29

TO REMOVE MAIN PRINTED CIRCUIT BOARDS (CPU AND ADAREF)
Proceed as follows:-
1) Remove cover screws (19) and cover
2) Remove rear panel screws (9). 2 on each end and 5 on underside.
3) Remove the 3 centre plate/heatsink screws from the underside.
4) Gently ease the rear panel away from the main printed circuit boards,
disconnecting the 3 header plugs.
5) Remove all ÔCPUÕ and ÔADAREFÕ printed circuit fixing screws (10).
6) Remove the 2 power supply connectors PL1 and PL3 and CPU keyboard and
LCD connectors PL4 and PL5
7) Lift out of the chassis - CPU + centre plate.
8) To separate the ÔADAREFÕ and ÔCPUÕ printed circuit boards - cut the cable tie
holding the ADAREF power cable on the underside of the ÔCPUÕ printed circuit board and
pull ADAREF board away from CPU board disconnecting PLI/SKI and PL2/SK2.
9) To re-assemble follow the above in reverse order firstly pushing the CPU and
ADAREF boards together and fitting a cable tie holding the ADAREF power cable in
position.
NOTE: Care should be taken not to trap the ADAREF power cable under the centre plate
when re-fitting to chassis. (Locate in cutout provided in centre plate).
* After board changes it may be necessary to reset the CPU Board to obtain correct
operation (this will reset parameters to factory set values). Power-on and while the ÒlogonÓ
information is displayed, i.e. Model No etc. Press the set key. The unit will then reset to
default settings.
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