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PARTS CATALOGUE / TECHNICAL GUIDE
[SPECIFICATIONS]
Item
Module
Module size
Outside diameter
Casing diameter
Height
Display medium
Liquid crystal driving system
Display system
Additional mechanism
Loss/gain
Regulation system
Measuring gate by quartz tester
Battery
Cal. W850A, W851A
Cal. W853A, W854A
Cal. No.
The illustrations refer to Cal. W853A.
ø29.0 mm
–
6.0 mm (Including the battery portion)
Nematic Liquid Crystal, FEM (Field Effect Mode)
Multiplex driving system
• Time/calendar display
• Stopwatch display (Up to 9 hours, 59 minutes and 59.99 seconds in
1/100 seconds)
• Alarm display (5-channel daily alarm)
• Timer display (Two types of countdown timer: Preset timer with 10
preset times and 10-hour adjustable timer)
• World time display (38 cities)
• Selection of a desired mode in the menu display
• Changeover between the normal and enlarged displays
• Quick digits moving function
• Graphic display, scroll display and motion graphic demonstration
function
• Auto illumination function
• Electroluminescent panel
• Battery life indicator
• Sound demonstration
• Changeover between 12- and 24-hour indications
Monthly rate at normal temperature range: less than 20 seconds
Nil
Any gate can be used.
SEIKO CR2025, Sony CR2025, Matsushita CR2025
Battery life is approximately 2 years.
Voltage: 3.0 V
W850A, W851A, W853A, W854A
(x 1.0)
1
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Related Manuals for Seiko W850A
Summary of Contents for Seiko W850A
- Page 1 • Changeover between 12- and 24-hour indications Loss/gain Monthly rate at normal temperature range: less than 20 seconds Regulation system Measuring gate by quartz tester Any gate can be used. Battery SEIKO CR2025, Sony CR2025, Matsushita CR2025 Battery life is approximately 2 years. Voltage: 3.0 V...
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Page 2: Parts Catalogue
PARTS CATALOGUE Cal. W850A, W851A, W853A, W854A → Disassembling procedures Figs. : → Reassembling procedures Figs. : Lubricating: Types of oil Oil quantity Silicone oil 500,000 Normal quantity Case back screw Case back 4589 024 Piezoelectric element Case back gasket... - Page 3 PARTS CATALOGUE Cal. W850A, W851A, W853A, W854A 0110 196 (Cal. W850A) 0110 197 (Cal. W851A) 0110 211 (Cal. W853A) 0110 132 (Cal. W854A) Sticker 4225 098 Battery clamp Battery (See the front page.) 4408 068 Spacer for switch spring (B)
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Page 4: Technical Guide
Cal. W850A, W851A, W853A, W854A Remarks: • Conductive spring Some models use a conductive spring as a casing part. Check the case number and refer to “SEIKO Parts Catalogue”. 20 Liquid crystal panel The type of liquid crystal panel is determined based on the design of cases. Check the case number and refer to “SEIKO Parts Catalogue”... - Page 5 TECHNICAL GUIDE Cal. W850A, W851A, W853A, W854A • METHOD 2 To reset the circuit of a complete watch: Press and hold buttons “A”, “B”, “C” and “E” at the same time for 2 to 3 seconds. Button B Button C * The display will become blank, indicating that the circuit is reset.
- Page 6 TECHNICAL GUIDE Cal. W850A, W851A, W853A, W854A Conductive plate Case middle Conductive plate for the side button Conductive plate for the front button Case back Button spring clip Conductive plate • When closing the case back, check that the conductive plates are in contact with the case back, being bent by it towards the center of the watch.
- Page 7 TECHNICAL GUIDE Cal. W850A, W851A, W853A, W854A [ How to release the hooking portion ] Spacer for switch spring (B) Switch spring (B) • Do not disassemble the switch spring (B) and its spacer except when they need to be replaced.
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Page 8: Value Checking
TECHNICAL GUIDE Cal. W850A, W851A, W853A, W854A Electroluminescent 22 Electroluminescent lead terminal lead terminal • How to install Set the end portion of smaller diameter to the guide hole of the liquid crystal panel frame. Liquid crystal panel frame 20 Liquid crystal panel 23 Liquid crystal panel frame “B”... - Page 9 TECHNICAL GUIDE Cal. W850A, W851A, W853A, W854A • Time accuracy 1) Light up all the segments of the display, following the procedure above. 2) Place the watch on the microphone’s mark for placing the watch with the liquid crystal panel facing the mark.
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Page 10: How To Use
HOW TO USE Cal. W850A, W851A, W853A, W854A • The functions and operation of the buttons are listed below. For checking or repair of the watch, refer to the table below for guidance. Button B Button C Button D Button E... - Page 12 99-10 Printed in Japan...