New GentleYAG
Focus Lens Replacement Procedure
Candela Corporation
8503-01-0838 Revision 01
Candela Corporation Proprietary
Page 2 of 5
FOCUS LENS REPLACEMENT
WARNING!!
THE HIGH VOLTAGES PRESENT IN THIS SYSTEM ARE LETHAL. THIS
PROCEDURE MUST BE PERFORMED ONLY BY THOSE TECHNICIANS WHO AR E
FAMILIAR WITH THE PRECAUTIONS REQUIRED WHEN WORKING WITH HIGH
VOLTAGE SYSTEMS, AND THOSE WHO HAVE BEEN TRAINED ON THE
GENTLEYAG SYSTEM AND ITS PROCEDURES.
WARNING!!
THE LASER WILL DUMP ALL CAPACITOR VOLTAGE WHEN THE SYSTEM IS SHUT
DOWN BUT, THE HIGH VOLTAGE CAPACITOR STILL MAY RETAIN LETHAL
VOLTAGES. IF VOLTAGE REMAINS, IT MUST BE DISHCARGED BEFORE THE
LASER IS MOVED OR SERVICED FOR ANY REASON. RESIDUAL VOLTAGES
REQUIRE STICK DISCHARGING OR TIME FOR THE BLEEDER CIRCUITS TO
COMPLETELY BLEED THE VOLTAGE OFF OF THE CAPACITOR. SEE THEORY OF
OPERATION FOR BLEED TIME DESCRIPTION. VERIFY THAT THE CAPACITOR IS
DISCHARGED BELOW 25VDC, CHECKED VIA A DVM WITH HIGH VOLTAGE PROBE,
BEFORE SERVICING.
NOTE:
EXERCISE EXTREME CAR E. CLEANLINESS OF OPTICS IS
ESSENTIAL. REFER TO SERVICE PROCEDURE 8503-01-0060 FOR OPTIC
CLEANLINESS. REFER
TO DRAWINGS 7122-00-3446, 7122-00-7477 AND 7122-00-7476
FOR SPECIFIC DETAILS.
1. Remove the fiber from the fiber receptacle. Remove top cover and laser rail dust cover.
2. Remove the shutter. Temporarily remount the shutter with one screw above fiber
focusing assy in the dust cover mounting hole.
3. Remove screws holding the fiber receptacle to the rail.
4. Disconnect the microswitch.
5. Remove the fiber receptacle, see figure 1.
1. Loosen the two Jam nuts on the set screws.
2. Loosen the two set screws.
3. Loosen the two positioning screws on the
focus lens housing.
4. Remove the four rear screws that secure the
focus lens housing (7122-00-7476) into the
fiber receptacle assembly.
(Pay attention to component order when
disassembling)
Set screws (Jam
nuts not shown)
Four rear
Fiber Sense
Micro-switch
