new install on a DSC PC1555MX and when I powered up , nothing from the keypad . cabling all seems to be correct , I followed the instructions hooked the battery up first then the power . went to the keypad blank .

checked for power at the outlet and it was good .

any thoughts ?

bad board ?

bad keypad ?

second when setting up zones with N/C contacts why would I want to use the resistors ?

it gives me the choice of using a 5600 resistor or not

whats the reason /advantage in using them ?

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