GW Instek GFG-8210A - Manual (Page 17)

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7-2.Fuse Replacement Procedure
When proceed calibration or maintenance of the Function
Generators, if want to replace the fuse, the upper cover must be removed
according to the following steps:
1). The handle must be turned downward 90 degrees first.
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USER MANUAL
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2). Pull apart the handle from the Function Generator. Please turn the
handle left and right side slightly, that will make easier to pull off the
handle.
3). There are two washers inside of two holes (the joints of handle and
case) respectively. Please use a screwdriver to pry open these
washers.