Storz 201340 20, Руководство по обслуживанию

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General complaint of low brightness (as from serial no. LF0611983)
– Examine all other parts in the optical system, including the light guide cable, the endoscope, the video
camera and lenses.
– Measure the power (in W) required by the lamp. Measure the voltage across the RV2 resistor and
multiply the value by 100. Measure the voltage across the lamp. Multiply these two values together to
find the lamp power. The power requirement should be at least 235 W, but not more than 300 W. If the
lamp power is 235 W … 300 W, and the light output is too low, replace the lamp.
Caution: Lamps are high pressure vessels and must be handled with care. When
handling the lamp wear safety glasses and face shields to protect the face
and gloves to prevent skin oil transfer. Never touch the porcelain insulator on
the lamp with bare hands. When working with an operating lamp, wear eye
and face protection to prevent blindness or UV damage.
Caution: Connect the voltmeter only when the lamp is already started; otherwise, the
high-voltage starting pulse will damage or destroy the voltmeter. Do not
restart the device when making measurements.
Replace lamp indicator lights before 450 hours have elapsed
– Check to see if the counters have been reset.
Light-cable input-end burning
– Check for inadequate cleaning of the cable, or use of a previously burned cable.
– Unsuitable light-guide; that is, a light-guide only suitable for low power use.
3.3.2 Component courses of action
Lamp
– If the lamp fails before 500 hours, look for the following items to ensure no other problems were
responsible. Replace the lamp.
• Check for marked discoloration inside the lamp (usually caused by a seal leak).
• Check for a cracked window (caused by thermal shock).
• Check for a crazed or burned reflector. This can be caused by overheating or overcurrent, and is
indicative of problems elsewhere.
Light attenuator
– Check for a jammed attenuator wheel or a broken part. Replace if necessary.
– Lamp timer circuit
A problem may be evident either through the non-operation of the front panel LED or a gross error in
the timing (e.g., the replace lamp timer board).
• If the replace lamp indicator lights before 450 hours have elapsed, inspect U4.
XENON NOVA
®
300
MODEL 20
1340 20
06.11 / V1.6
3-9