Brother P-touch QL-710W Service Manual page 93

If the VR value is not within the pass range (218 to 222), perform the following
procedure:
(6) Peel the volume cover label from the upper cover.
(7) Use a screwdriver to turn the VR adjustment screw until the VR value displayed
in the "Results" field is within the range of 218 to 222.
NOTE: Check that the screwdriver is set in the groove on the VR adjustment screw,
and then turn the VR adjustment screw slowly. The VR adjustment screw can
only be turned within a limited range. Do not force it.
(8) When adjusted so that "OK" is displayed in the "Results" field, click the [Stop]
button.
Volume cover label
Upper cover
Fig. 7 VR adjustment OK (after adjusting)
Fig. 5 VR adjustment NG
Screwdriver
Fig. 6 Volume cover label
1 - 4
VR adjustment screw
Groove