Zebra 3742 Service Manual download pdf (Page 43)

Upgrades to Memory and Real Time Clock Option 980357-215A

These procedures outline the steps to access and replace SRAM memory, IE flash program memory,

and the real-time clock option.

Preparations

1. Make sure you have a back up any fonts, forms and graphics you downloaded to the printer.

2. Follow the removal steps of the Media Frame Replacement procedure (980357-207).

Replacing the Integrated Circuit Chips

Protect against static discharge when following this procedure. Your work area

must be static-safe and include a properly grounded conductive cushioned mat

to hold the printer and a conductive wrist strap for yourself.

Push the wire bundles aside to see the main printed circuit board assembly in the bottom case.

To replace a chip, use the following procedure:

1. Use chip pliers to pull the chip out of its

socket on the main PCBA.

2. Carefully align each chip and insert it

into the main PCBA. Check that all pins

are in their holes.

! Flash/Firmware 1MB Upgrade -- U18 and

U4. IE Flash stores pre-designed elements

(fonts, forms and graphics) that go into a print

job plus some operation code for the printer.

" SRAM 512KB Upgrade -- U15 and U6.

SRAM provides image buffer for the printer.

A larger SRAM capacity allows for larger

images.

# Real Time Clock Option -- U22. The real

time clock option stores the time of day and

date. The chip's battery has a life of up to ten

years. See the EPL2 Programmer's Manual

for information about setting the real time

clock, and formatting the layout of the date

and time.

980357-001 Rev. A 35

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Zebra 3742 Service Manual Page 43