Seiko 4M21A Quick start guide

SUPPLEMENT
TO
PARTS CATALOGUE /TECHNICAL GUIDE
Cal. 4M21A
VOL. 2
While we have once issued “SUPPLEMENT TO PARTS CATALOGUE/TECHNICAL GUIDE Cal. 4M21A”, we would
like to inform you here that the following movement parts for Cal. 4M21A are changed again to new ones which
lead to enhanced performance and longer duration.
Notes:
●When repairing Cal. 4M21A watches, please be sure to refer to this supplement together with “PARTS
CATALOGUE/TECHNCIALGUIDECal.4M21A”issuedinAug.1996and“SUPPLEMENTTOPARTSCATALOGUE/
TECHNICAL GUIDE Cal. 4M21A” issued in Nov. 1999.
●When the new rechargeable battery unit is installed into the movement, please note that the original capacitor
clamp should not be used. If the original clamp is used with new rechargeable battery unit, it could lead to short
circuit or damage the movement. To avoid disorder, please order new rechargeable battery unit and
rechargeable battery clamp in a set by parts code “3027 4MZ” (3027 4MZ contains both rechargeable battery
unit and rechargeable battery clamp.)
●After the new rechargeable battery unit is installed, the indicator display for duration of charge will change.
Please see below chart of “Comparative matrix between original and new power resource”.
●Regarding the circuit block, there will be no change. Please refer to “SUPPLEMENT TO PARTS CATALOG/
TECHNICAL GUIDE Cal.4M21A” issued in Nov.1999.
●In and after June 2000 , original capacitor unit will be discontinued and no longer available. New parts in a set
(rechargeable battery unit and rechargeable battery clamp) will be supplied to you if you order the old capacitor
by parts No. 3029 114 or 3029 116.
CHANGE OF POWER RESOURCE
AND PARTS INFORMATION
FOR Cal. 4M21A
[INFORMATION: Comparative matrix between original and new power resource]
New rechargeable battery unit
(3027 29R)
Original capacitor /
1st upgraded capacitor
(3029 114 / 3029 116)
Indicator display
and Duration
(Approx.)
Indicator display
and Number
of swings
(Approx.)*
5 seconds 3 hours 3 hours
10 seconds 1 day 1 ~ 20 days
20 seconds 2 days 20 ~ 40 days
30 seconds 3 days 40 ~ 42 days
5 seconds 100 times 100 times
10 seconds 350 ~ 400 times 350 ~ 400 times
20 seconds 700 ~ 800 times 6000 times
30 seconds 1050 ~ 1200 times 12000 times
* The number of swings may differ according to the way of swinging.

New parts
*3027 29R
(Rechargeable battery unit)
Original parts 1st upgraded parts
(Introduced in the Supplement
issued in Nov. 1999)
K.E.S.U.
(Capacitor unit /
Rechargeable battery unit)
Part
name
“ES614” is written
on the other side. “MT616” is written on the other side.
2000-5 Printed in Japan
PARTS LIST
Capacitor clamp /
Rechargeable battery clamp
3029 114
(Capacitor unit) 3029 116 (Capacitor unit)
*4225 552
(Same as 1st upgraded one)
4225 552 4225 552
(Code unchanged)
This can be used with
original capacitor unit also.
* When you change the original power resource to new rechargeable battery unit, the clamp is also required
to be changed. Please order them as a set by parts code 3027 4MZ to avoid confusion. (3027 4MZ contains
both rechargeable battery unit and rechargeable battery clamp)
* Each parts also can be supplied separately by each parts code.
Marking for
discrimination Marking for discrimination
Black marking