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PARTS CATALOGUE / TECHNICAL GUIDE
CAUTION
The SEIKO SCUBA Cal. 7K52A is intended for use in diving, an inherently hazardous
form of recreation. Therefore, it is absolutely essential that you strictly observe all
instructions for the repairing and checking of the SEIKO SCUBA watch described in
this guide.
Take the greatest possible care when repairing and checking the depth measurement
function as well as the water resistant quality of this watch, because the depth meas-
urement serves as a guideline when the user is making a dive.
In addition, you must fully understand the following:
•
This watch is for use in recreational scuba diving (no-decompression diving), and
is not for decompression diving, saturation diving or diving at altitudes.
•
It is for use in water having a temperature range of 0° C to 40° C.
•
It can measure the depth of sea water correctly, whose specific gravity is 1.025,
but not that of fresh water.
It is recommended that you explain to users the specifications of the watch, limits of
use and cautions on improper use as required. In doing so, refer to the "CAUTION"
included at the beginning of the instruction booklet of the watch.
Cal. 7K52A
1
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Summary of Contents for Seiko 7K52A
- Page 1 Cal. 7K52A CAUTION The SEIKO SCUBA Cal. 7K52A is intended for use in diving, an inherently hazardous form of recreation. Therefore, it is absolutely essential that you strictly observe all instructions for the repairing and checking of the SEIKO SCUBA watch described in this guide.
- Page 2 Monthly rate at normal temperature range : less than 15 seconds Regulation system Measuring gate by quartz tester Use 10-second gate. SEIKO CR2016, Maxell CR2016, Sanyo CR2016, Matsushita CR2016, Battery Eveready CR2016 Battery life is approximately 2 years. Voltage : 3.0 V...
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Page 3: Parts Catalogue
Disassembling procedures Figs. : → Reassembling procedures Figs. : Lubricating: Types of oil Oil quantity Moebius A Normal quantity SEIKO Watch Oil S-6 Extremely small Silicone oil 500,000 c.s. Piezoelectric element Diving time hand Minute hand Case back Hour hand... - Page 4 PARTS CATALOGUE Cal. 7K52A 0012 354 Date dial guard screw 4283 612 Depth hand wheel clamp 1002 618 Depth hand wheel 1017 610 Setting lever for maximum depth hand 0808 606 Date dial guard 1018 610 Setting lever spring for maximum...
- Page 5 PARTS CATALOGUE Cal. 7K52A 0022 230 Spacer for circuit block screw 0022 230 Battery clamp 0439 612 screw Spacer for circuit block 4225 692 4246 693 Battery clamp Buzzer lead terminal (with AC comment sheet) 4000 694 A/D circuit block...
- Page 6 PARTS CATALOGUE Cal. 7K52A 0027 974 Pin for train wheel bridge 0125 610 Train wheel bridge 0950 590 Intermediate alarm wheel 0270 610 Center wheel for alarm 0261 583 Minute wheel for alarm 1002 620 Diving time wheel 0241 583...
- Page 7 PARTS CATALOGUE Cal. 7K52A 4146 612 Step rotor 4146 612 Step rotor for diving time hand 4146 612 Step rotor for alarm 4146 612 Step rotor for 1/10 m depth hand 4002 690 Coil block 4002 690 Coil block for diving time hand...
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Page 8: Technical Guide
The winding stem and crown form an inseparable unit. The winding stem alone, therefore, is unavailable for supply but supplied as part of the crown. Check the case number and refer to “SEIKO Casing Parts Catalogue” to choose a corresponding crown. - Page 9 TECHNICAL GUIDE Cal. 7K52A REMARKS ON INSTALLING THE BATTERY • After the battery is replaced with a new one, or after the battery is re-installed following the repairing procedures, be sure to short-circuit the AC terminal and the battery connection (+) (circuit block guard) to reset the circuit as illustrated below.
- Page 10 TECHNICAL GUIDE Cal. 7K52A III. REMARKS ON DISASSEMBLING AND REASSEMBLING Movement When installing the movement into the case, check that the switch lead terminal (A) securely makes contact with the auto switch terminal of the case. The switch lead terminal is...
- Page 11 TECHNICAL GUIDE Cal. 7K52A • How to recall the log data : Press the button at the 10 o’clock side with the crown at the normal position. (By pressing the button 3 times, a beep sounds and the display returns to the TIME/CALENDAR.)
- Page 12 TECHNICAL GUIDE Cal. 7K52A Setting lever spring for maximum depth hand Pin for setting lever spring Setting position mark • It is not necessary to remove the setting lever spring for maxi- mum depth hand from the maximum depth hand wheel except when it needs to be replaced with a new one.
- Page 13 TECHNICAL GUIDE Cal. 7K52A 54 Circuit block cover (B) 56 Circuit block cover (A) • Pry up the one hooking portion of circuit block cover (B) and the three hooking portions of the circuit block cover (A) with the tip of a screwdriver to remove them.
- Page 14 TECHNICAL GUIDE Cal. 7K52A 62 Train wheel bridge Before setting the train wheel bridge, be sure to check that each wheel is set at the right position and the lower pivot is inserted correctly. 63 0950 590 67 0241 583...
- Page 15 TECHNICAL GUIDE Cal. 7K52A 91 Winding stem (with crown) • Remarks on installing To remove the winding stem (with crown), pull out the crown to the first click, and then, pull out the setting lever (“A” portion in the illustration below) while pressing it.
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Page 16: Value Checking
TECHNICAL GUIDE Cal. 7K52A 100 Plus lead terminal 97 Switch lever (C) 98 Switch lever (B) • Setting postion Set the switch levers (C) and (B) and the plus lead terminal as shown in the illustrations below. Switch lever (C) - Page 17 TECHNICAL GUIDE Cal. 7K52A • Function checking When checking the functions, operate the crown and buttons as follows. Measurement halt warning mark 1/10 m depth hand Extra measurement range warning mark Minute hand Hour hand Button at the 2 o’clock side Button at the 10 o’clock side...
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Page 18: Elapsed Time
6) If the obtained depths fall within the range shown in the table below, the pressure sensor is normal and accurately measures the depth. Pressure value Depth display of Cal. 7K52A 1.00 kg/cm 8.5 ~ 10.5 m 3.00 kg/cm 27.5 ~ 30.5 m...
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