Current Repair
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5.
Current Repair
5.1. General Requirements
Digital EEG system repair requires special training of the technical staff and special
equipment and service software which you can receive from the manufacturer or the
representative of the firm. The repair connected with the EEG electronic unit opening
is prohibited. The repair of computer equipment and pattern-stimulator monitor can be
conducted by dedicated establishments for computer equipment service.
The digital EEG system current repair includes the component parts and cables
repair. The component parts repair when connecting to digital EEG system is
prohibited.
When conducting current repair, all the EEG units must be switched off.
5.2. EEG, ECG Cables, Adapters and Linkers Repair
Cables are examined externally. The circuit break control is conducted. Shielded
cables are also checked for short circuit between screen and cable, and between
cables. In case of cable break or ground, it is necessary to replace or cut it if the cable
length is sufficient.
5.3. Computer Interface Cable Repair (USB cable)
Computer interface cable (Fig. 10) is examined externally, and the circuit is checked
for short circuit or break. In case of cable failure, it should be replaced or repaired by
shortening the length. When replacing it is necessary to pay attention to the cable
marking. The use of the cable with other marking is prohibited.
Fig. 10. Computer interface cable electrical schematic
5.4. Auditory Stimulator Repair
Auditory stimulator (headphones) (Fig. 11) is examined externally, and circuit
resistance of dynamic head and cable are measured. The measured value should be
between 90 and 110
Ω
. When detecting the break or short circuit it is necessary to
open cable jack unit and check it. If the failure is not discovered, open the auditory
stimulator unit and measure each cable and coil of dynamic head. If the cable break is
detected, see the instruction on the USB cable repair (see chapter 5.3 “Computer
Interface Cable Repair (USB cable)”). If the dynamic head failure is detected, address
to firm-manufacturer for the further repair.
