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Parts List / TECHNICAL GUIDE
ANALOGUE SOLAR Cal. V157A/V158A
Item
V157A
3 hands (hour, minute and second hands)
date indicator/day indicator(only for V58A)
Motion of the second hand
Driving system
Additional function
Normal position
Crown operation
st click position
2nd click position
Loss/Gain
Regulation system
Gate time for rate measurement
Current consumption
Coil resistance
Power
Power supply
generator
Rechargeable
battery
Operating
voltage range
Power reserve
Number of jewels
Cal. No.
V158A
One-second intervals
Stepping motor piece
Instart-start function
Energy depletion forewarning function (The second hand moves at
two-second intervals.)
Overcharge prevention function
Electronic circuit reset function
Second hand stop function
Date calendar
Instant setting device for date calendar
Day calendar (only for V58A)
Instant setting device for day calendar (only for V58A)
Free
Date setting(counter clockwise)
Day setting (clockwise, only for V58A)
Time setting
Monthly rate:less than 5 seconds (worn on the wrist at
temperature range between 5 to 35 degrees Centigrade)
Nil
Use 0-second gate
Movement: less than 0.80 μA
Circuit block: less than 0.40 μA
Coil block: .80 - 2.20 KΩ
Solar power generation system
MT920 Manganese titanium lithium rechargeable battery
0.45V - 2.20V
From full charge to stoppage: Approximately 0 months
2 jewels
V157A/V158A
Diameter
Height: 3.5mm
/8
Movement
Outside: 28.6 mm
Casing: 24.0 mm
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Summary of Contents for Seiko V157A
- Page 1 PARTS LIST / TECHNICAL GUIDE ANALOGUE SOLAR Cal. V157A/V158A [SPECIFICATIONS] Cal. No. V157A/V158A Item Movement V157A V158A Diameter Outside: 28.6 mm 3 hands (hour, minute and second hands) date indicator/day indicator(only for V58A) Casing: 24.0 mm Height: 3.5mm Motion of the second hand...
- Page 2 SPECIFICATIONS Cal. V157A/V158A FEATURES The Cal. V57A/V58A are analogue watches with a solar power generation system. l Solar power generation system The watch operates while charging electricity by converting light received on the dial to electrical energy. It lasts for 0 months after full charge.
- Page 3 PARTS LIST Cal. V157A/V158A Order of disassembly: 1 Order of assembly: Lubricating: Types of oil Oil quantity AO-3 Normal quantity AO-2 Hour, minute and second Hands dial dial wasHer spacer 0493 500 Holding ring for dial solar cell 4025 581(V157a)
- Page 4 PARTS LIST Cal. V157A/V158A recHargeaBle Battery unit screw 0022247 recHargeaBle Battery unit 3023 24y circuit Block coVer screw 0022247 circuit Block coVer 4461522 (V157a) 4461520 (V158a) circuit Block 4000655 train wHeel Bridge 0125907 fourtH wHeel and pinion 0241559 tHird wHeel and pinion...
- Page 5 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.
- Page 6 PARTS LIST Cal. V157A/V158A l Tools and consumables required for disassembling/reassembling • Movement holder UNIVERSAL MOVEMENT HOLDER (S-682) • Watch oils SEIKO watch oils (AO-3 and AO-2) AO-2 AO-3 6/8...
- Page 7 TECHNICAL GUIDE Cal. V157A/V158A REMARKS ON DISASSEMBLING AND REASSEMBLING HANDS • How to install Place the movement directly on a flat metal plate or the like to install the hands. In doing so, check that the spring portion of the circuit block cover is not pressed down.
- Page 8 Cal. V157A/V158A TECHNICAL GUIDE 4 HOLDING RING FOR DIAL • Disassembling . The HOLDING RING FOR DIAL is fixed by 4 hooking portions. 2. Insert the tip of a screwdriver into the gap between the hooking portion and main plate as shown in the illustration, and then turn the screwdriver in the direction of the arrow to release the hooking portion from the main plate.
- Page 9 TECHNICAL GUIDE Cal. V157A/V158A q; INTERMEDIATE WHEEL FOR DAY SETTING (only for V58A) Please take care of the assembling direction of INTERMEDIATE WHEEL FOR DAY SETTING. B part qa DATE DIAL GUARD For the Cal. V57A and V58A, new assembling construction with 3 hooking portions and 2 guide pins are used.
- Page 10 Cal. V157A/V158A TECHNICAL GUIDE RECHARGEABLE BATTERY UNIT • How to remove Battery lead terminal Remove the battery lead terminal screw, and then pry up the “A” portion in the illustration with tweezers to remove the rechargeable battery unit. “B” portion •...
- Page 11 Fig. 2 BATTERY CONNECTION (+) * When measuring the current consumption using the SEIKO digital multi-tester (S-860), use the range of 40μA of SUPPLY V (=.55V) & GATE TIME (2S). 3) Wait until a stable measurement becomes available. It usually takes 30 seconds to a few minutes for getting a stable measurement.
- Page 12 ) Connect each probe to the appropriate (-) and (+) input terminal of the ws CIRCUIT BLOCK (please refer to the "Structure of the CIRCUIT BLOCK" below). * When measuring the current consumption using the SEIKO digital multi-tester (S-860), use the range of 40μA of SUPPLY V (=.55V) & GATE TIME (2S).
- Page 13 SOLAR CELL and (+) probe to the wa CIRCUIT BLOCK COVER (as illustrated in Fig. 3). Fig. 3 * When measuring the voltage using the SEIKO digital multi-tester (S-860), use the range of V (Fig. 4). Fig. 4 4) Expose the watch to the light of a fluorescent lamp (use the one with 5 to 20 watts) at a distance of 5 cm while connecting the probes to the watch (Fig.
- Page 14 <How to check the solar power generation with the SOLAR CELL alone> ) Set the DIAL to the HOLDING RING FOR DIAL. 2) Connect the tester as the below illustration. * When measuring the voltage using the SEIKO digital multi-tester (S-860), use the range of V (Fig. 6.) Fig. 6 2) Expose the SOLAR CELL to the light of a fluorescent lamp (use the one with 5 to 20 watts) at a distance of 5 cm while connecting the probes to the solar cell unit (Fig.
- Page 15 TECHNICAL GUIDE Cal. V157A/V158A CHECKING THE INSTANT-START FUNCTION The instant-start function works when the voltage of the rechargeable battery is more than 0.9V. Therefore, please measure the battery voltage and make sure that the battery is ready for checking the instant-start function.
- Page 16 Cal. V157A/V158A TECHNICAL GUIDE CHECKING THE RECHARGING FUNCTION In order to check the recharging function, measure the voltage of the rechargeable battery before and after recharging. If the voltage increases to a certain extent, it shows that the recharging function is working properly.
- Page 17 TECHNICAL GUIDE Cal. V157A/V158A FUNCTION CHECK Operation Function Checkpoint Pull out the crown to the 2nd Set ting mechanism Make sure that it has click and push switching the func- a click at each posi- it back in to the...
- Page 18 Cal. V157A/V158A TECHNICAL GUIDE CHECKING THE WATER RESISTANCE Check the water resistance according to the designated specification of the watch. Marking on the case back Test method Applied pressure WATER RESISTANT (WATER RESIST) 3 BAR Air leak test WATER RESIST 5BAR...