Q:I have a charging issue with a GE Healthcare AMX 4 Plus. First off, we had to replace the batteries as they were due for replacement. After replacement, the portable started having a problem with the breaker tripping. Prior to reaching a full charge, the breaker would trip. We calibrated the battery charger and now the charging meter does not reach full charge, stopping at two bars before it reaches full charge and the message never appears stating that the batteries have completely charged. We did the volt meter calibration before the battery charger calibration so I don’t understand why this is happening. No matter how long we wait, the display never indicates that the batteries have completely charged. We checked FIL/KVP and the input power to the charger board, connections to LVLE and CPU as well as battery voltage. Checked KHZ board connections and — +24 Volts, recalibrated the unit and it still does not reach charge complete status.
A: You stated you performed the cal volt meter procedure, but you didn’t say if you performed the cal generator procedure right after the for the volt meter calibration? This is critical, especially if you had a +/- 0.2V difference between the voltage display when compared to actual battery voltage measurement during the cal volt meter procedure.
A: I read over your problem again and I think the cause can be described as: the internal capacity meter and the capacity displayed (batteries) are out-of-sync. This can indeed happen when a new battery set is installed followed by a volt meter calibration, just as you described. The percent capacity displayed is catching up to the internal capacity meter. One of the remedies you mentioned already was to charge until the “Charge Complete” is displayed, which in your case never happens. The other solution is to use the built in loop test diagnostic tool and force FF into a particular address location to get the percentage capacity display back to normal. The procedure I have works with certain firmware with certain Controller PCBs. I can’t speak to other combinations.
FOLLOW UP: Yes, sorry, we also did the Cal Generator calibration, still giving the same issue. We will have to try the loop test tool as you described.
Q: If you load defaults it will reset the battery metering routines that will then require a full re-calibration. However, before you do that make sure you don’t a) have a bad battery and/or b) there is not a poor connection with your new battery pack. You should have a battery test strip. Make sure each battery is within 0.2 volts of all the others.
A: I have had that problem many times. I’ll give you the procedure to correct that.
1. Begin with service switch in run mode (up position) and power on machine.
2. The boot sequence will began, after 3 seconds flip service switch down for diagnostics mode
3. Use KVP buttons to scroll the option until you see diagnostics mode then press MAS down to enter.
4. The system will prompt you for password which is MAS up MAS down KVP down KVP up (in the formation of a backwards U).
5. Continue by using KVP buttons to scroll to the system diagnostics option and press MAS down to enter.
6. Use KVP buttons to scroll to loop test and press MAS down to accept. It will ask you for an address.
7. The address is ocb4 then press MAS down. (Enter numeric values by pressing KVP up and Alphabetical values by press KVP down.)
8. Press MAS up for HEX
9. Press KVP down for write and press MAS down to accept
10. Then, you will need to type FF and MAS down to begin the looping process
11. Once you see looping on display hit MAS down 3 times and use KVP to scroll to end service and follow instructions.
A: We have been in the process of changing out power strips with the new ones that comply with the required UL standards for each use. We purchased some Tripp Lite PS-406-HGULTRA power strips that comply with UL60601-1 (also UL60950-1) to use as “free floating” power strips in surgery whenever the need arises. I’ve found that the power strips don’t work at all, not even the LED power indicator comes on, when used in a surgery room with line isolation monitors in the room. The breakers were not popped. I’m not sure if it matters but our LIMs are very old. The strips work fine in an ordinary 120V outlet outside of our surgery rooms. Also of note, the power strips that meet the UL1363A standard for power strips that are mounted, work just fine in all applications. Has anyone else seen this problem? What did you do about it?
A: I looked on the Internet and the description of the Tripp Lite PS-406-HGULTRA says “patented protection circuit guards against shock hazards by preventing power from reaching the unit’s outlets in the presence of a fault. The protection circuit automatically resets itself and restores power once the fault threat is gone.” Does anyone know of a power strip that meets the UL60601 standard that will work with a line isolation monitor?
A: Had the same problem with Tripp Lite Power Strips. There is a smart circuit in some models that see no ground with an isolated system and won’t work. Call Tripp Lite they can tell you which power strip to use.
THE SHOP TALK article is compiled from TechNation’s ListServ and MedWrench.com. Go to www.1TechNation.com/Listserv or www.MedWrench.com/?community.threads to find out how you can join and be part of the discussion.
© 2015, TechNation Magazine. Site designed by MD Publishing, Inc.