Canon D78-5132, Service Manual

Page: 57 / 134

1. BEFORE ADJUSTMENTS
Part 3: Adjustment
3-1
IC302 on the main board stores the data for the service adjustments,
and should not be replaced except for the case of defective device.
If replaced, it should be performed the re-adjustments following to the
“Electrical Adjustments”.
The data of lamp replacement monitor timer is stored in the IC302.
Please note that the lamp replacement monitor timer is reset when the
memory IC (IC302) is replaced.
(Lamp replacement monitor time can not be set to the previous value.)
Caution to memory IC replacement
When IC302 is replaced with new one, the CPU writes down the default
data of the service adjustments to the replaced IC, refer to the service
adjustment table. As these data are not the same data as factory
shipped data, it should be required to perform the re-adjustments
following to the “Electrical Adjustments”.
Please note that the lamp replacement monitor timer is reset.
Caution of Main Board replacement (in the case IC302 is not
defective)
When the main board is replaced, IC302 should be replaced with the
one on previous main board. After replacement, it should be required
to perform the re-adjustments following to the “Electrical
Adjustments”.
In this case, the lamp replacement monitor timer can be kept the value
as before.
CAUTION