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Seiko 7T85, Technical Manual, Page: 8 / 17

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Seiko 7T85 Technical Manual Download Page 8

Cal. 7T85A

PARTS LIST

8/7

●

  How to find the correct parts, if not determined by 4 digit caliber number

●

  Tools and consumables required for disassembling/reassembling

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.

 

✳

    

HOLDING RING FOR DIAL   (0866788)

 

 3    

DATE DIAL    

 

 

 

(0878***)

 

49    

SETTING STEM  

 

 

(035583)

● 

How to discriminate resembled parts

Refer to the illustrations below to see the difference between those two types of pins. 

     PIN FOR DATE DIAL GUARD     

 

0027973

8   PIN FOR TRAIN WHEEL BRIDGE    

 

0027974

 • Movement holder

 

UNIVERSAL MOVEMENT HOLDER 

(S-682)

• Watch oils

 

SEIKO watch grease (S-6) and watch oils (AO-3 and AO-2)

S-6

AO-2

AO-3

Summary of Contents for 7T85

Page 1: ...WATCH hand position adjustment 1 second 4002700 2 pieces 2 10 2 70 KΩ 1 Coil block for hour minute and small second 2 Coil block for stopwatch second 4002711 2 pieces 1 80 2 40 KΩ 1 Coil block for stopwatch minute 2 Coil block for stopwatch 10 minute Circuit block Less than 0 30 μA Movement Less than 1 10 μA Date setting clockwise Time setting hand position adjustment resetting the circuit Free 55...

Page 2: ... 7T85A Double Retrograde Chronograph Measurement performance Displays the elapsed time with the 3 designated STOPWATCH hands Measures up to 109 minutes 59 8 seconds in 1 5 second increments Button operation Crown position Normal position Button A START STOP Button B SPLIT SPLIT RELEASE RESET Measurement functions Accumulated elapsed time measurement and split time measurement are available 1 STOPW...

Page 3: ...time signal Crown Note Pressing Button A for longer than 2 seconds here will allow you to resume the procedure again as indicated by the arrow if neccessary Button B Button A Button B Button A Button B Press Button A for longer than 2 seconds The STOPWATCH 1 minute hand turns a full circle Press Button B to set the STOPWATCH 1 minute hand to the 0 position Press Button A for longer than 2 seconds ...

Page 4: ... DATE DIAL GUARD CALENDAR MECHANISM Disassembling procedures Figs 1 54 Reassembling procedures Figs 54 1 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 Refer to page 9 for f...

Page 5: ...09 ANTI MAGNETIC SHIELD 8 BATTERY SR927SW 9 0022230 BATTERY CLAMP SCREW 10 4225571 BATTERY CLAMP 11 0022459 CIRCUIT BLOCK COVER SCREW 12 4457980 CIRCUIT BLOCK COVER 13 4224514 CONDUCTING PLATE 14 0396580 FRICTION SPRING FOR SECOND COUNTING 15 4000664 CIRCUIT BLOCK 16 0022459 CIRCUIT BLOCK COVER SCREW 3 pcs 0022230 BATTERY CLAMP SCREW 3 pcs ...

Page 6: ... WHEEL PINION 32 4283581 SPACER FOR CENTER WHEEL PINION 34 4146710 STOPWATCH ROTOR FOR SECOND 35 4146710 STOPWATCH ROTOR FOR MINUTES 25 0950590 10 MINUTES COUNTER INTERMEDIATE WHEEL 26 0270582 10 MINUTES COUNTING WHEEL 28 0241583 FOURTH WHEEL PINION 30 0231580 THIRD WHEEL PINION 31 0261580 MINUTE WHEEL 33 0221583 CENTER WHEEL PINION 36 4146710 STOPWATCH ROTOR FOR 10 MINUTES 17 4270710 BATTERY CONN...

Page 7: ...OIL BLOCK FOR 10 MINUTES 40 4002711 STOPWATCH COIL BLOCK FOR MINUTES 39 4239712 ROTOR STATOR FOR CHRONOGRAPH FOR 10 MINTUES 52 4450701 SWITCH LEVER FOR RESET BUTTON 47 4239713 ROTOR STATOR FOR CHRONOGRAPH MINUTES 51 0100559 MAIN PLATE 54 46 4450703 SWITCH LEVER FOR START STOP BUTTON 0383592 SETTING LEVER 45 49 0351583 SETTING STEM 0384582 YOKE 43 0281580 SETTING WHEEL 42 4239717 ROTOR STATOR FOR C...

Page 8: ...lease refer to the SEIKO WATCH PARTS CATALOGUE in order to choose corresponding parts HOLDING RING FOR DIAL 0866788 3 DATE DIAL 0878 49 SETTING STEM 0351583 How to discriminate resembled parts Refer to the illustrations below to see the difference between those two types of pins 1 PIN FOR DATE DIAL GUARD 0027973 18 PIN FOR TRAIN WHEEL BRIDGE 0027974 Movement holder UNIVERSAL MOVEMENT HOLDER S 682 ...

Page 9: ...ing 46 SWITCH LEVER FOR START STOP BUTTON 45 SETTING LEVER 43 YOKE 44 TRAIN WHEEL SETTING LEVER TRAIN WHEEL SETTING LEVER YOKE SETTING LEVER SWITCH LEVER AO 3 or MS A SEIKO Watch Oil S 6 48 SETTING STEM Crown position 1st click position Push the SETTING LEVER gently refer to the picture on the right in order to disengage it from the SETTING STEM Then pull out the crown with the stem completely ...

Page 10: ... COUNTING WHEEL 0270582 35 STOPWATCH ROTOR FOR MINUTES 4146710 23 MINUTE COUNTER INTERMEDIATE WHEEL 0950590 34 STOPWATCH ROTOR FOR SECONDS 4146710 20 SECONDS COUNTING WHEEL 0888582 27 SMALL SECONDS WHEEL 0240580 29 FIFTH WHEEL PINION 0701580 37 ROTOR 4146710 28 FOURTH WHEEL PINION 0241583 25 10 MINUTES COUNTER INTERMEDIATE WHEEL 0950590 36 STOPWATCH ROTOR FOR 10 MINUTES 4146710 31 MINUTE WHEEL 026...

Page 11: ...STOP WATCH ROTOR FOR 10 MINUTES 37 ROTOR 34 STOPWATCH ROTOR FOR SECONDS 35 STOPWATCH ROTOR FOR MINUTES as illustrated below 31 MINUTE WHEEL 26 10 MINUTES COUNTING WHEEL 20 SECONDS COUNTING WHEEL and 27 SMALL SECONDS as illustrated below After setting the 19 TRAIN WHEEL BRIDGE and 18 PIN FOR TRAIN WHEEL BRIDGE as illustrated below lubricate the upper pivots of the following parts ...

Page 12: ...ment 4 Make sure the read value is less than 1 10 μ A How to measure the current consumption for the whole movement How to measure the current consumption for the CIRCUIT BLOCK alone 1 To measure the current consumption for the CIRCUIT BLOCK alone connect each probe to the appropriate positive or negative input terminal of the CIR CUIT BLOCK please refer to Structure of the CIRCUIT BLOCK below Whe...

Page 13: ...sistance of each coil block if they are within the range in the following table 2 10 KΩ 2 70 KΩ 2 10 KΩ 2 70 KΩ 1 80 KΩ 2 40 KΩ 1 80 KΩ 2 40 KΩ COIL BLOCK A STOPWATCH COIL BLOCK FOR SECONDS STOPWATCH COIL BLOCK FOR MINUTES COIL BLOCK FOR STOPWATCH 10 MINUTE 4002700 4002700 4002711 4002711 ...

Page 14: ...40 35 Pull out the crown to the 2nd click then turn it Second hand stop function if avail able Make sure that the sec ond hand stops when the crown is pulled out to the 2nd click Setting mechanism hour and minute hand setting Make sure that the hour and minute hands move smoothly with o u t t o u c h i n g e a c h other or touching the surface of the dial or inside of the glass Hands installation ...

Page 15: ...20 BAR WATER RESISTANT WATER RESIST Marking on the case back Air overpressure test Water overpressure test and condensation test Water tightness and water overpressure test and condensation tests before after water overpressure test SCUBA DIVER S AIR DIVER S 150 m SCUBA DIVER S AIR DIVER S 200 m He GAS DIVER S 300 m He GAS DIVER S 600 m He GAS DIVER S 1000 m 18 75 BAR 150 m times 0 125 25 BAR 200 ...

Page 16: ...r the whole movement exceeds the s tandard value Check the rotation and engage ment of the date dial bend the date dial downward to adjust the clearance Or replace the date dial with a new one Dirt dust or foreign particles are adhered to the movement Remove dirt dust or foreign par ticles and clean the movement The driving pulse is generated in order to compensate the exces sive load applied to t...

Page 17: ...and lubricate appropriately The circuit block pattern has been broken or bent Adjust the circuit block pattern or replace the circuit block with a new one The crown falls off The winding stem is not securely installed the setting lever and yoke are disengaged Check the main plate winding stem setting lever and yoke Replace the defective parts with new ones The current consumption exceeds the stand...

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