QB-V850ESFJ3 Preliminary User’s Manual ZUD-CD-05-0149 30/57
2.6.5 Precautions for mounting IC using TC and MA
(1) Confirm that there is no weld flash in the resin (sealant part) of the IC. If there is weld flash, remove it using
a knife or the like.
(2) Confirm that there is no weld flash breaking or bending of IC leads. In particular, confirm the planarity of IC
leads. If there is abnormality in the planarity, correct that portion.
(3) Viewing the TC contact pins from the top, if there are foreign bodies on them, remove them using a brush or
the like.
After confirming (1) to (3), fit the IC to the TC. Also fit the MA.
(4) Put the supplied M2
×
6 mm screws in the four accessory holes of the MA and fasten the screws in opposite
corners. At that time, use either the dedicated screwdriver that is supplied or a torque driver to fasten them
equally in turn with a tightening torque of 0.054 Nm (MAX.). Since the contact is poor if tightening is too
great, once you have lightly fastened the MA screws, tighten them again.
(5) Depending on the use environment, when starting up a device that has been left for a long time, starting it
may be difficult. In this case, loosen the screws slightly and then retighten them.
(6) If startup still is difficult after (5) above, check (1) to (3) again.
(7) Tightening the screws of the MA too much may give rise to cracks in the molded part of the MA (plastic part)
and bend the mold into a bowed shape, making contact poor.
(8) After soldering the TC, do not perform cleaning by flux immersion or vapor.
