Agilent Technologies 990 Micro GC Safety Manual page 12

Power
The front power switch does not disconnect power for the instrument. Pressing
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the disconnect switch places the instrument in a standby mode. To avoid an
electric shock hazard, disconnect the device by unplugging the power cord
before performing instrument service.
If the enclosure of the external power supply is damaged or cracked, it must be
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replaced. Contact your Agilent service representative.
For the Mobile Micro GC, do not attempt to replace the rechargeable batteries.
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Read the Mobile Micro GC User Manual (G3588-90015) before charging or
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discharging.
12 Agilent 990 Micro GC and 990 Mobile Micro GC Chromatograph Safety Manual