Service manual

Security Device Maintenance
2–44 V Series Service Manual
Replacing the
PROM
The Programmable Read-Only Memory (PROM) stores the program that
controls the operation of the V Series Security Device. From time to
time, BEST might upgrade the PROM either to add new features and
functions or to fix problems. Follow the instructions below to upgrade
the security device by replacing the PROM.
Circuit boards may be shipped without the PROM. If you are replacing
the circuit board, you will need to remove the PROM from the existing
circuit board and install it in the new circuit board, or you will need to
install a new PROM. Follow the instructions below.
Note: To remove the PROM without damaging the PROM socket, use a
tool specifically made for this purpose. You can purchase a PROM
removal tool at most electronics supply stores, or contact your local
BEST representative.
To remove the PROM:
Refer to Figure 2.20 and Figure 2.21 and follow the steps below.
1. For the V Series Electronic Lock, remove the inside and outside
trim. For instructions, see To remove the inside and outside trim:
on page 2-38. For the V Series Controller, remove the enclosure
cover.
Caution
Before you handle the circuit board or any component on the circuit
board, make sure that you are properly grounded using an
electrostatic discharge (ESD) protection kit. When ordering an ESD
protection kit, refer to the part number on page 2–27. Touching the
circuit board without proper grounding can damage sensitive
electronic components—even if you don’t notice any static discharge.
2. For the V Series Electronic Lock, disconnect the inside wire harness
and the outside wire harness from the circuit board in the inside
trim.
Caution
When performing step 3, do not force the PROM out of its socket.
Prying too far or too forcefully may damage the PROM socket.