Advertisement
Quick Links
PARTS CATALOGUE / TECHNICAL GUIDE
[SPECIFICATIONS]
Item
Movement
Movement
Outside diameter
size
Casing diameter
Height
Time indication
Driving system
Additional mechanism
Loss/gain
Regulation system
Measuring gate by quartz tester
Battery
Battery No.
Voltage
Battery life
Jewels
Cal. 4F56A, 8F56A, 8F58A
Cal. No.
The illustrations refer to Cal. 8F56A.
ø18.5 x 17.7 (3H - 9H) x
18.5 (12H - 6H)
Including the
(
)
battery portion
3 hands (hour, minute and second hands) + 24-hour hand
• Step motor (for 24-hour, hour, minute and second hands)
• Ultrasonic motor (for calendar indication)
• Calendar (Leap year indication, month and date)
Perpetual calendar up to February 28, 2100
• Independent adjustment of hour hand
• Train wheel setting device
• Electronic circuit reset switch
• Battery life indicator
Annual rate within normal temperature range: less than 20 seconds
Approx. 5 years
4F56A
17.1 (3H - 9H)
4.8
Logical regulation (Pattern cutting system: 3 steps)
Use 10-second gate.
CR1612
Approx. 10 years
8F56A
ø26.4 x 25.6 (3H - 9H) x 25.6 (12H - 6H)
24.8 (3H - 9H) x 24.8 (12H - 6H)
4.8
BR2412
3.0 V
4 jewels
8F58A
(x 1.0)
Approx. 8 years
1
Advertisement
Related Manuals for Seiko 8F56A
Summarization of Contents
Remarks on Watch Components
Back Plate Mounting
Instructions for mounting the watch's back plate.
Case Ring Selection
Guidance on selecting the correct watch case ring.
Circuit Block Structure
Structure for Cal. 4F56A
Circuit block structure specific to Cal. 4F56A.
Structure for Cal. 8F56A, 8F58A
Circuit block structure specific to Cal. 8F56A and 8F58A.
Disassembly and Reassembly Remarks
Movement Holder Usage for 4F Series
Instructions on using the movement holder for 4F Series.
Movement Holder Usage for 8F Series
Instructions on using the movement holder for 8F Series.
24-hour, Hour, Minute, and Second Hands
Setting the Watch Hands
Steps for correctly setting the watch hands.
Installing the Watch Hands
Procedure for installing the watch hands.
Date Dial Guard
Removing the Date Dial Guard
Steps for removing the date dial guard.
Value Checking
Coil Block Resistance Measurement
Measurement of coil block resistance.
Current Consumption Measurement
Measuring current consumption of the movement and circuit block.
Time Accuracy
Checking Time Accuracy
Procedure to check watch time accuracy.
Time Accuracy Adjustment by Pattern Cutting
Adjusting time accuracy by cutting patterns.
Need help?
Do you have a question about the 8F56A and is the answer not in the manual?
Questions and answers