Cadex C4000 SERIES, User Manual

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Service
Note
B
For the 27C256 the jumper should be installed
between the center pin and the pin marked 256.
B
For the 27CS12 the jumper should be between
the center pin and the pin marked 512.
Install clock chip
6. Install the clock chip in the 8 pin socket identified as
U25. Refer to "6" Motherboard
Layout" in this chapter.
Observe the correct orientation.
Install back-up battery
7. Remove the right aluminum side plate and install the
back-up battery. Observe the correct polarity.
CAUTION:
DANGER OF EXPLOSION IF BACK-UP
BATTERY IS INCORRECTLY REPLACED. REPLACE
ONLY WITH SAME OR EQUIVALENT TYPE
RECOMMENDED BY CADEX. DISCARD USED
BATTERY ACCORDING TO THE MANUFACTURER'S
INSTRUCTIONS.
8.
Move all toggle switches on the front to the center
position (CHARGE)
9. Re-install lower housing and side plate. Make sure the
toggle switches are seated properly by gently tugging
them towards the bottom of the unit.
10.
Turn unit on. Check for correct sign-on message.
Non-volatile
RAM ERROR message
When the unit is first turned on after replacing the back-
up battery, a non-volatile
RAM ERROR message will
appear. To continue, press any Display Key. Pressing
the Key initializes the clock chip.
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11. Set date and time. Select print format. Refer to
CHAPTER 10 - OPTIONS
The Data Retention function is now active. The unit will
. hold the test results on a power failure and resume
when the power is restored.
Verification
To verify the correct operation, turn the power off for two
minutes and on again while the batteries are being
serviced. The battery data, Datemme
and print format
should be retained -- if not, check the back-up battery .
13-7