Seiko YT57B - Circuit Block Cover; Circuit Block

7
TECHNICAL GUIDE
Cal. YT57B
• How to remove
Insert the tip of tweezers into the “C” portion
gap in the illustration at right, and pry up the
rechargeable battery unit to remove it.
• How to install
Set the “A” portion of the minus lead terminal
to the hole of the main plate, and push the “B”
portion down vertically so that the
rechargeable battery unit is well seated in
position.
Note: Take utmost care not to short-circuit the
(+) and (–) terminals, as this will deteriorate
the battery unit.
“A” portion
Main plate
“C” portion Minus lead terminal
Rechargeable
battery plus
terminal
“B” portion
20 Circuit block cover
Circuit block cover for after-sales servicing use
has no such marks printed on it as calibre number
and numeral indicating hand installation height.
21 Circuit block
The circuit block for Cal. YT57B and that for Cal. 5M6 Series have a close resemblance in shape. They
can be discriminated in the point that the former has a hole for discrimination while the latter doesn’t
as illustrated below. When repairing the circuit block, check the hole for discrimination to make sure
you are using the proper one.
Hole for discrimination
No hole for discrimination
[ Circuit block for Cal. YT57B ] [ Circuit block for Cal. 5M6 Series ]