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Instruction Manual
PARTS LIST / TECHNICAL GUIDE
Double Retrograde Chronograph Cal. 7T85
[SPECIFICATIONS]
Item
• 3 hands (hour, minute,
and small second hands)
• Calendar (date: date dial)
Interval of hands movements
Driving system
Additional function
Crown operation
Normal position
st click position
2nd click position
Loss/Gain
Regulation system
Gate time for rate measurement
Current consumption
Coil resistance
Battery No.
Power supply
Battery voltage
Battery life
Number of jewels
Cal. No.
55
50
45
40
35
second
Stepping motor, 4 pieces
• STOPWATCH functions
00-minute stopwatch in /5-second increments, consecutively
measurable up to 300 minutes (5 hours)
Accumulated Elapsed Time Measurement
Split Time Measurement
STOPWATCH hand position adjustment
• Battery life indicator (The small second hand moves at two-sec-
ond intervals.)
• Date correction function
• Second hand stop function
• Electronic circuit reset function
Free
Date setting (clockwise)
Time setting, hand position adjustment / resetting the circuit
Monthly rate: Less than 5 seconds (worn on the wrist at
temperature range between 5 ºC and 35 ºC)
Nil
Use 0-second gate.
Movement:
Circuit block:
4002700, 2 pieces: 2.0 – 2.70 KΩ
. Coil block for hour, minute, and small second
2. Coil block for stopwatch second
40027, 2 pieces: .80 – 2.40 KΩ
. Coil block for stopwatch minute
2. Coil block for stopwatch 0 minute
SEIKO SR927SW
.55 V
Approx. 3 years
0 jewel
7T85A
Movement
• Diameter
Outside: Ø 27.6 mm
• Height:
3.3 mm
Less than .0 μA
Less than 0.30 μA
/7
Casing:Ø 27.0 mm
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Table of Contents
Related Manuals for Seiko 7T85
Summary of Contents for Seiko 7T85
- Page 1 PARTS LIST / TECHNICAL GUIDE Double Retrograde Chronograph Cal. 7T85 [SPECIFICATIONS] Cal. No. 7T85A Item Movement • 3 hands (hour, minute, • Diameter and small second hands) Outside: Ø 27.6 mm Casing:Ø 27.0 mm • Height: 3.3 mm • Calendar (date: date dial)
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Page 2: Specifications
SPECIFICATIONS Cal. 7T85A has a new structure employing one crown and two buttons, but the basic movement structure of Cal. 7T85A is similar to the previous Cal. 7T Series watches, and the knowledge and technique you have gained in handling the previous Cal. 7T Series watches will come in handy when you repair Cal. -
Page 3: Necessary Procedure After Battery Change
SPECIFICATIONS NECESSARY PROCEDURE AFTER BATTERY CHANGE After installing the battery, pull out the crown to the second click position. And then follow the instructions below to correct the hand positions and set the time. 1. Main time setting Pull out to the 2nd click when the small second hand is at the Crown 12 o’... -
Page 4: Parts List
PARTS LIST Cal. 7T85A Disassembling procedures Figs. : Reassembling procedures Figs. : * For the type of oil and quantity of lubrication, refer to the following TECHNICAL GUIDE section. Remarks on removing the SETTING STEM To remove the SETTING STEM when taking out the movement from the case or while disassembling the parts during repair work, be sure to pull out the crown to the first click, and then, re- move the SETTING STEM while pushing the setting lever. - Page 5 PARTS LIST Cal. 7T85A [BATTERY AND ELECTRONC CIRCUIT ] 4259509 ANTI MAGNETIC SHIELD 0022230 BATTERY CLAMP BATTERY SR927SW SCREW (3 pcs.) 0022459 0022230 CIRCUIT BLOCK BATTERY CLAMP SCREW COVER SCREW ( 3 pcs.) 4225571 BATTERY CLAMP 0022459 CIRCUIT BLOCK COVER SCREW 4457980 CIRCUIT BLOCK COVER 4224514...
- Page 6 PARTS LIST Cal. 7T85A [GEAR TRAIN MECHANISM] 17 270710 BATTERY CONNECTION(-) 18 002797 PIN FOR TRAIN WHEEL BRIDGE 19 0125509 TRAIN WHEEL BRIDGE 20 0888582 SECOND COUNTING WHEEL 21 0885590 SECONDS COUNTER 1ST INTERMEDIATE WHEEL 22 0885591 SECONDS COUNTER 2ND INTERMEDIATE WHEEL 23 0950590 M I N U T E S C O U N T E R...
- Page 7 PARTS LIST Cal. 7T85A 4002700 [SETTING MECHANISM/ STOPWATCH COIL BLOCK FOR STEPPING MOTORS SECONDS (STATORS AND COIL BLOCKS)] 4002711 STOPWATCH COIL BLOCK FOR MINUTES 4002711 STOPWATCH COIL BLOCK FOR 10 MINUTES 4002700 COIL BLOCK (A) 0281580 SETTING WHEEL 0384582 YOKE 0391591 TRAIN WHEEL SETTING LEVER 0383592...
- Page 8 ● How to find the correct parts, if not determined by 4 digit caliber number Following parts are determined based on the design of watches, such as hands height, dial color, and design of cases. Please refer to the SEIKO WATCH PARTS CATALOGUE in order to choose corresponding parts.
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Page 9: Technical Guide
● Setting mechanism • Setting position and lubricating AO-3 (or MS-A) SWITCH LEVER FOR START/STOP BUTTON SEIKO Watch Oil S-6 SETTING LEVER YOKE TRAIN WHEEL SETTING LEVER TRAIN WHEEL SETTING LEVER YOKE... - Page 10 TECHNICAL GUIDE Cal. 7T85A ● Gear train mechanism • Setting position and lubricating STOPWATCH THIRD WHEEL 0 MINUTES 0 MINUTES ROTOR FOR & PINION COUNTING COUNTER 0 MINUTES 023580 WHEEL INTERMEDIATE 44670 0270582 WHEEL 0950590 FOURTH WHEEL & PINION 024583 MINUTE WHEEL 026580 ROTOR...
- Page 11 TECHNICAL GUIDE Cal. 7T85A After setting the 9 TRAIN WHEEL BRIDGE and 8 PIN FOR TRAIN WHEEL BRIDGE as illustrated below. lubricate the upper pivots of the following parts: • 36 STOP WATCH ROTOR FOR 0 MINUTES, 37 ROTOR, 34 STOPWATCH ROTOR FOR SECONDS, STOPWATCH ROTOR FOR...
- Page 12 * When measuring the current consumption using the SEIKO digital multi-tester (S-860), use the range of 40 μ A of SUPPLY V (= 1.55 V) & GATE TIME (2 S). 2. Connect the AC component to the positive terminal for 2 seconds until a short circuit occurs to reset the integrated circuit.
- Page 13 TECHNICAL GUIDE Cal. 7T85A ● Value checking – coil resistance (coil blocks) Check the resistance of each coil block if they are within the range in the following table. COIL BLOCK (A) 2.10 KΩ ~ 2.70 KΩ 4002700 STOPWATCH COIL BLOCK FOR SECONDS 4002700 2.10 KΩ...
- Page 14 TECHNICAL GUIDE Cal. 7T85A ● Function check Before doing the following function check, follow the instructions on P.3 to correct the hand positions, set the time and operate the stopwatch function. Operation Function Check point Pull out the crown to Setting mechanism Make sure that it has a the 2nd click and push...
- Page 15 TECHNICAL GUIDE Cal. 7T85A ● Water resistance test Check the water resistance according to the designated specification of the watch. Marking on the case back Water resistance test Applied pressure WATER RESISTANT (WATER RESIST) Air overpressure test 3 BAR WATER RESIST 5 BAR 5 BAR Wa t e r o v e r p r e s s u r e WATER RESIST 10 BAR...
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Page 16: Troubleshooting
TECHNICAL GUIDE Cal. 7T85A TROUBLESHOOTING Symptom Possible causes Solutions Measure the bat ter y voltage. Movement The watch stops operat- The battery has been depleted. Replace the battery with a new ing. one. The hour wheel and the pinion of Check the relevant par ts, and the minute wheel are not prop- replace the damaged parts with... - Page 17 TECHNICAL GUIDE Cal. 7T85A Symptom Possible causes Solutions STOPWATCH O n e o r m o r e S T O P - The relevant coil is broken. Measure the coil block resist- W A T C H h a n d s h a v e ance.