6
Regular Maintenance
CPI Canada Inc.
Use and disclosure is subject to the restrictions on the title page of this CPI document.
Page 6-10
CMP 200
®
X-Ray Generator Service Manual Ch # 901476-08 Rev. B
6.7.0 BATTERY
REPLACEMENT
Membrane Control console
Refer to 6.6.0 (Firmware Upgrade) for the procedure to access the console board as required to change the
battery. The figure described in 6.6.1 that shows the EPROM also shows the battery location.
1.
Switch the generator OFF at the console, and disconnect the mains voltage.
2.
Remove the console battery from the holder by gently prying under the battery at the access slot in the
battery holder using a small screwdriver. Slide the battery over the edge of the holder and remove it
when it is free.
3.
Check the voltage of the new battery prior to inserting it. This should be nominally 3.2V, do not use if it
is under 2.90 V.
4.
Wipe the replacement battery with a clean cloth, and ensure that the holder is clean before inserting
the new battery.
5.
Gently lift the spring contact on the holder and insert the replacement battery, positive (+) side up.
Generator Control Board
The battery on the generator control board powers the Timekeeper SRAM chip U85 when the generator is
switched off. This contains the real-time clock and the RAM memory that stores the tube heat-unit calculations.
If the battery voltage drops below acceptable limits, the current date and time, along with the tube heat-unit
calculations will be lost when the generator is switched off.
The AEC board will need to be temporarily removed to replace the battery, if the AEC option is fitted. Refer to
6.8.0 for the procedure to remove and replace the AEC board.
1.
Locate the battery on the generator control board. The battery is contained in a yellow plastic package
that sits on top of the Timekeeper SRAM chip U85, near the middle of the generator control board.
2.
Remove the battery by
GENTLY
prying between the battery and the generator control board. Be very
careful not to damage the Timekeeper SRAM chip U85 that is directly under the battery.
3.
Insert the replacement battery into the socket on U85. Orient the replacement battery such that the dot
on the corner of the battery is near the dot on the generator control board.
4.
A stamp error message may be observed at initial turn-on after replacing the battery. This is normal at
this point and will be cleared by setting the date and time in the next step.
5.
Reset the date and time, if required. Refer to chapter 3C for the procedure to do this.
