CHATTANOOGA
GROUP INC.
Head Warming Problems
Usually an explanation of exactly how this feature works will help you
determine if the problem is due to the Applicator or the Ultrasound Generator
Board.
When Head Warming is selected, the ultrasound output is turned on at
half the maximum output for the head size, and the frequency is set to 3 MHz.
The head temperature is monitored and when it reaches a temperature slightly
above skin temperature the output is reduced to a level of about 10% of
maximum to maintain the temperature. If the temperature rises above the skin
temperature while at the 10% level, the output is turned off until the temperature
falls back down. On the other hand, if the temperature rises to the maximum
head temperature, the unit will display “HHH” and the output will be turned off to
protect the crystal in the Applicator. Bear these facts in mind: at any time Head
Warming is on the output can be off, at 10% or 50% of maximum and the unit is
functioning normally. Reaching “HHH” occasionally would not be abnormal but
could indicate that the Applicator is extremely inefficient. Recalibration (see the
Applicator Calibration Procedure) or replacement would be required to correct
this.
If the head never warms up, check for output at 3 MHz by selecting 3.3MHz,
Continuous and pressing Start. Is there output at 3 MHz?
Yes
- Something is malfunctioning on the Ultrasound Generator Board.
No
- Remember that Head Warming uses the 3 MHz output. The
Applicator may need to be recalibrated for 3 MHz operation (see the
Applicator Calibration Procedure) or be replaced.
Display Related Problems
Stim unit LCD
Is the LCD screen completely black?
Yes
- Adjust the contrast. Is the problem corrected?
No
- The LCD screen should be replaced.
No
- Is the LCD screen garbled ? (lines, odd text, etc.)
Yes
- Is the problem consistent? (If there is a line across the
screen, is it always in the same place?)
Yes
- The problem is most likely the LCD display.
No
- The problem is usually the Control Board.
No
- Is the LCD screen completely blank?
Innovation starts here
TM
29
Intelect
®
Legend Series Service Manual
