Oscillating Weight Screw; Capacitor Unit; Circuit Block Cover - Seiko 5M42A Technical Manual

TECHNICAL GUIDE

16 Oscillating weight screw

Tighten the oscillating weight screw very firmly, applying
more force than usual.

22 Capacitor unit

• Though the capacitor unit for Cal. 5M4 Series is of a completely different type than that for Cal. 5M2 Series,
they have a close resemblance in shape. To prevent confusion between them, the capacitor unit for Cal.
5M4 Series has two holes for discrimination on its lead terminal portion. When replacing the capacitor
unit, check for the holes to make sure you are using the proper one.
• Be sure to observe the correct polarity of the capacitor unit. The lead terminal side is the (–) side as shown
in the illustration.
• To install the capacitor unit, set the "A" portion to the hole of the main plate, and then push the "B" portion
so that it is fixed in position.
Note: Handle the capacitor unit with care so as not to short-circuit its (+) and (-) terminals.

24 Circuit block cover

The circuit block cover we are supplying has no calibre
number nor numeral printed on it for discriminating the
hand installation height.
8
Hole for discrimination
A
Main plate
Cal. 5M42A, 5M43A
Oscillating weight screw
B
Capacitor connection (+)
Capacitor lead terminal