MERLIN LEGEND Communications System Release 6.1
Maintenance and Troubleshooting
555-661-140
Issue 1
August 1998
Page E-2
Modifying the Processor
Figure E-1. Modifying the Processor for Key Mode
!
CAUTION:
Do not touch the HDR3 header on the processor board; the header is
exposed when the feature module is not installed in the processor. If the
HDR3 header is removed, system programming may be deleted and will
have to be restored.
!On the exposed portion of the processor board, find the header
marked
HDR4
; it is in the upper-left area.
A shunt is attached to one of the pins on the HDR4 header.
!Remove the shunt from the single header pin; then reinsert it so
that it covers both pins on the header.
IC45
IC44
IC27
1
1
Y1
CR4
CR3
CR2
CR1
HDR3
IC15
IC17 IC19
IC21
IC16 IC18 IC20
IC22
IC57
IC50 IC51
IC56
IC55
IC36
IC11
IC64
1
IC10
IC48
IC4
IC62
IC66
IC61
HDR4
IC7
Y2
HDR4
SHUNT
IC1
J21
HDR3
!
Do not touch
HDR3