Trouble Shooting the Nucleus CI 24

Child's Name: ____________________________

Date of Last Mapping: _____________________

Recommended Program #: __________________

Audiologist: ______________________________

Processor Serial Number: ___________________

Recommended Mic Sensitivity: ______________

Suggested Spare Equipment: 1 short cord (goes from mic to coil), 1 long cord (goes from processor to mic), 2 AA alkaline batteries, earphones, coil-check wand, lapel microphone.

Quick Check

The coil check wand has been shown to drain power when placed over the coil positioned on the child's head (this is especially true for the ESprit Speech Processor). Instead remove the coil from the child's head and place it in the palm of your hand (it should remain attached to the headset and processor). Place the wand over the coil and the red light should light up to your voice. If it does, the quick check will tell you that the signal is being transmitted through the entire system, however, it does not tell you about the quality of the signal. It is recommended that you proceed with the following protocol for troubleshooting on a regular basis.

Step 1

Battery Check

A. Check that the display panel is on. If nothing is in the display panel follow steps 1-2.

If the battery symbol is display in the panel, ( ) follow step 4.

Trouble Shooting

1. Turn the processor on. ( button)

2. If there is still no display, check polarity of batteries (+ and -).

3. If still no display, replace the batteries.

4. If the low battery symbol appears replace the batteries.

If the public alarm is enabled ( ), it will beep four times each minute when the batteries are nearly dead. Replace the batteries.

Step 2

Program Check

A. Look at the display panel. Make sure the program display matches the recommended program and the mic sensitivity is at the recommended level.

Proram #

Microphone sensitivity

If program panel does not match recommended settings, follow setps 1-3.

N.B. If lock function is enabled, you will see a padlock

symbol in the display. You will not be able to change the settings until you unlock the buttons To unlock the buttons, hold down

the select button until the lock symbol disappears from the display panel. After changing the settings, reset the lock by holding down the select button until the padlock symbol appears again.

1. Make sure the recommended program is set.

2. If mic sensitivity level is not at the recommended setting, use the + & - buttons to adjust level.

2. If the and symbols are in the display, or if the display shows a Program other than the recommended one and the ( ) button does not allow you to re-select the recommended program, the MAP may be corrupted. If another program is available, the processor automatically selects it. If all 4 programs are corrupted, the processor stops working. Please contact the parents if the recommended program cannot be used or if you see the fault and warning symbols in the display panel.

Step 3

Transmitting Coil and Cords

A. To check that the speech processor is transmitting sounds to the cochlear implant, place the transmitting coil on the back of the processor. The transmission symbol ( ) should appear in the lower left hand corner of the display panel.

If the panel does not display the transmission symbol, follow steps 1-3.


1. Replace the short cord, and try again.

2. If the symbol still does not appear, replace the long cord, and try again.

3. If the transmission symbol still does not appear in the display, the coil may be defective. Please contact parents.

Step 4

Ear Level Microphone Check

A. Speak into the headset microphone. You should see the segment meter respond to your voice.

B. Test the quality of the microphone by plugging the earphones into the smaller socket at the top of the processor.

If the segment meter is intermittent or does not respond to speech, or if the quality of the sound from the microphone is poor, follow step 1.


1. If the microphone is damaged, use the lapel microphone until the headset microphone can be replaced. Plug the lapel microphone into the external input socket (the larger of the two sockets) found at the top of the processor. Please contact parents.

Step 5

Ling Six Sound Test

A. With the unit on, have the child respone to the Ling Six Sound Test (ah, oo, ee, sh, s, m) at the level of his ability. Detection: have child raise hand in response to sound. Identification: have child show or repeat what is said.

If child does not respond at his/her typical levl of performance, follow step 1.
Record all errors.


1. If child does not respond consistently at his or her typical level, or if the child reports a change in the way the processor sounds, there may be a problem with the MAP of the processor. Please inform the parents so they can make arrangements for audiological management as necessary.