Seiko ST-306 User manual

I‑5039
SPORTS TIMER
ＳＴ−３０６
INSTRUCTION MANUAL
Many thanks for purchasing SEIKO SPORTS TIMER ST-306.
Before putting your SEIKO SPORTS TIMER, MODEL ST-306, to use, please be sure to carefully
read through this manual as it has been designed to provide you with information for correct
handling, use and maintenance necessary for safe, long-lasting and trouble-free operation.
Keep this manual at hand for ready reference.

I‑5039 1
-NOTICE-
(1) This manual is the property of SEIKO and may not without the express written consent of SEIKO be
copied or reproduced in any form, in whole or in part, or used for any purpose other than that for which
it is supplied.
(2) This manual may be subject to change without notice.
(3) This manual has been prepared to give complete information necessary for the operation, use, handling
and maintenance of SEIKO SPORTS TIMER, MODEL ST-306. For the purpose of our constant
technical manual improvement program, your questions, advice, suggestions and comments on the
descriptions, illustrations, procedures or any matter concerning this manual are highly appreciated.
(4) SEIKO shall not be liable for any failures of SEIKO SPORTS TIMER, MODEL ST-306 or direct or
indirect damages resulting from such failures if such failures are caused: due to abuse, misuse, failure to
observe instructions given in the manual and neglect of other reasonable care and servicing due to be
done by the owner irrespective of such instructions, and failure due to deliberate actions or gross
negligence or accident; or caused by changes, modifications, or alterations made without prior written
consent of SEIKO or by any person other than authorized by SEIKO.
-SYMBOLS AND THEIR MEANINGS-
The following conventions are used in this manual.
WARNING WARNING is used to indicate the presence of a hazard which CAN
cause SEVERE personal injury, death, or substantial property damage if
the warning under this heading is ignored.
CAUTION
CAUTION is used to indicate the presence of a hazard which may
cause property damage if the warning under this heading is ignored.
The following pictorial symbols indicate what must not be done.
General Prohibition Prohibition of Disassembly/Tampering
The following pictorial symbols indicate what must be done.
General instructions

I‑5039
2
-TABLE OF CONTENTS-
1 SAFETY PRECAUTIONS
2 FEATURES
3 PACKING LIST
4 NOMENCLATURE AND FUNCTIONS
(1) Sports timer
(2) Grip switch
(3) Battery box
(4) Control panel (lefthand side panel)
(5) Storage panel (righthand side panel).
5 PREPARATIONS BEFORE OPERATION
(1) Battery
(2) Battery box connection
(3) Connection of grip switch
(4) Checkup of battery voltage
(5) Self-check operation
(6) Measurement and display range
6 INSTALLATION OF SPORTS TIMER
(1) Standard installation
(2) Installation using optional attachments
7 SETTING OF FUNCTION SWITCH
8 APPLICATION (1): UPCOUNTING MODE
(1) Upcounting from 0
(2) Upcounting from a preset time
9 APPLICATION (2): REPETITIVE UPCOUNTING MODE
(1) Initial settings
(2) Time setting
(3) Operation and display
10 APPLICATION (3): DOWNCOUNTING MODE
(1) Initial settings
(2) Time setting
(3) Operation and display
5
7
7
8
8
8
9
10
11
12
12
13
15
15
15
15
16
16
16
18
19
19
21
22
22
22
22
23
23
23
23

I‑5039 3
11 APPLICATION (4): REPETITIVE DOWNCOUNTING MODE
(1) Initial settings
(2) Time setting
(3) Operation and display
12 APPLICATION (5): MANUAL CROSSOVER COUNTING MODE
(1) Initial settings
(2) Time setting
(3) Operation and display
13 APPLICATION (6): AUTOMATIC CROSSOVER COUNTING MODE
(1) Initial settings
(2) Time setting
(3) Operation and display
14 APPLICATION (7): TIME DISPLAY MODE
(1) Initial settings
(2) Time setting
(3) Operation and display
15 APPLICATION (8): SCOREBOARD MODE (STANDARD)
(1) Initial settings
(2) Operation and display
16 APPLICATION (9): SCOREBOARD MODE (TENNIS)
(1) Initial settings
(2) Operation and display
(3) Setting of initial value (for determination of deuce points)
17 APPLICATION (10): SCOREBOARD MODE (SOFT TENNIS)
(1) Initial settings
(2) Operation and display
(3) Setting of initial value (for determination of deuce points)
18 APPLICATION (11): SCOREBOARD MODE (COUNT DISPLAY)
(1) Initial settings
(2) Operation and display
(3) Setting of initial value
24
24
24
24
25
25
25
25
26
26
26
26
27
27
27
27
28
28
28
29
29
29
30
31
31
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32
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33

I‑5039
4
19 HOOK-UP WITH OTHER EQUIPMENT
(1) Connection with score operation unit (ST-23)
(2) Connection with signal distribution box (ST-22)
(3) Connection with sports printer (CT-1000/916) (standard operating mode)
(4) Connection with sports printer (CT-1000/916) (external synchronization mode)
(5) Connection with electronic starter (PS-107/105)
(6) Connection with ski event timing system (CT-400/300)
(7) Connection with swimming timing system (PT-7000/6000)
(8) Connection with indoor sports operation board (ST-2000/900/800 series)
(9) Connection with running time operation board (RT-120)
(10) Digital anemometer operation board (WG-200)
(11) Connection with Optical distance measuring equipment (DM-200)
(12) Precautions on hook-up
20 OPERATIONAL PRECAUTIONS
(1) POWER switch reclosing procedure
(2) Blackout procedure
(3) Procedure for restart after memory call
(4) Buzzer
21 CARE AFTER USE
22 SPECIFICATIONS
23 WHAT YOU NEED TO DO BEFORE CALLING A SERVICEMAN
34
34
34
35
36
37
37
38
39
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I‑5039 5
1 SAFETY PRECAUTIONS
The following precautions must be strictly observed for the safety of yourself and your fellow workers and for
the protection of property from loss and damages.
WARNING
Emergencies
Immediately turn off the POWER switch if you detect abnormalities of the
sports timer, such as fuming and burning odors. These abnormal conditions
may develop into serious accidents such as fatal electric shock, and fire if
left uncorrected. Refer inspection and repair services to your SEIKO
dealer or agent.
Foreign metal
pieces
Never put pins, wires, metal pieces or any other foreign objects into a
hole or slit in the instrument on purpose or otherwise. If a foreign object
is allowed into a hole or slit by mistake, turn off the POWER switch
immediately, and call your SEIKO dealer for help. Failure to follow this
instruction may lead to a risk of electric shock or fire. Inspection and
servicing should be left to the care of your SEIKO agent or dealer.
Disassembly,
repair or
modification
Tampering or unauthorized repair or modification of components may
adversely affect safety or performance of this instrument. Failure to follow
this instruction may lead to a risk of electric shock or fire. Inspection and
repair should be left to the care of your SEIKO agent or dealer.
Never leave the sports timer outdoors or in a place prone to be exposed
to water. Electric leakage may possibly lead to fatal electric shock or fire
accident
Mount the instrument firmly on a sturdy, level place in a manner that it will
not fall over under the influence of wind, vibration or shock. Failure to
observe this precaution may result in injury to personnel or damage to the
instrument.
When installing the sports timer using the stand (ST-20) or car roof rack
attachment (ST-21), firmly tighten up the fastening screws. If precariously
installed, the instrument may yield and fall under wind pressure, vibration
or shock, causing serious injury to personnel or damage to the instrument.
When the sports timer is mounted on the stand (ST-20), never use it when
the wind is blowing at a velocity of 15m/s or more. Failure to observe this
precaution may cause fatal accident and property damage.
When the sports timer is mounted on the car roof rack using the
attachment (ST-21), limit the car speed to less than 30km/h. Failure to
observe this precaution may cause fatal accident and property damage
due to fall of the instrument.
Installation
When installing the team name display unit (ST-24), be sure to engage the
round bars into the mating holes and tighten up the thumb nuts firmly.
Failure to observe this precaution may cause serious injury to personnel
due to fall of the display unit under the influence of wind, vibration or
shock.

I‑5039
6
CAUTION
Handle the cable with care. Never damage or given undue stress to the
cable. Nicking the cable sheath, placing heavy objects upon the cable, or
straining the cable by undue bending is most prohibitive. Failure to observe
this precaution may lead to fatal electric shock or fire accident.
Do not use any cable other than specified for exclusive use with the
instrument. Failure to observe this precaution may cause cable burnout or
instrument failure.
Never handle the cable connector with wet hands as such operation can
result in fatal electric shock.
Cabling
Be sure to turn off the POWER switch in advance when plugging and
unplugging the cable, except in case the sports timer is connected to
CT-1000/916 for external synchronization mode operation.
STRICTLY OBSERVE THE FOLLOWING PRECAUTIONS.
FAILURE TO OBSERVE THESE PRECAUTIONS MAY LEAD TO EXPLOSION, ELECTROLYTE
LEAKAGE, AND EXOTHERMIC REACTION OF DRY CELL, CAUSING INJURIES AND
ENVIRONMENTAL POLLUTION.
Never use any power supply other than “AA”alkali dry cell (LR6) or
manganese dry cell (R6PU).
Do not use different types of dry cells together.
Do not use old and new dry cells together. When loading the instrument
with dry cells for the first time or when replacing spent dry cells, be sure
to use a battery of new dry cells.
When setting the dry cells into the instrument, do not mistake their plus
and negative poles for each other. Place them in the battery hatch
oriented as instructed. If the dry cells are set in the wrong directions,
instrument failure and other troubles may result.
Handling of
dry cell
After use, be sure to remove the dry cells from the instrument. If the dry
cells are left inside for a long period of time, electrolyte may leak to
damage the internal components of the instrument.

I‑5039 7
2 FEATURES
(1) SEIKO SPORTS TIMER, MODEL ST-306, is a large-sized digital sports timer full of SEIKOs advanced
timing functions. It has 6-digit 200mm-high display modules for clear-cut visibility, can be installed and
operated with ease. It weighs only 12.5 kg.
(2) As an upcount timer, it can be used as a timing display system for various sports events including
swimming, track races, marathon, walking race, skiing, cycling, soccer, and rugby.
(3) The MODEL ST-306 can also be used for the display of game points and deuce points in tennis.
(4) As a downcount timer, MODEL ST-306 can downcount time to show the remaining time in basketball
and other games.
(5) The following three maximum time ranges are available which can be changed over from each other to
cover a wide range of sports events:
a) 99h59m59s
b) 59m59s9
c) 59m59s99
(Note: The fractions of a second are not displayed during counting.)
(6) The MODEL ST-306 can measure lap time, split time and finish time. In addition, it can memorize and
re-display either lap or split times for a maximum of 25 athletes. (Ex.: MODEL ST-306 can memorize
and display the order of arrivals and finish times for 1st to 25th places.)
(7) The upcount function is available in two modes: one in which the time is counted up from zero, and the
other in which the time is counted up from a preset time.
(8) The downcount function has a crossover counting mode in which the time is downcounted from a preset
time to zero and in succession upcounted from zero. This mode is suitable for marathon and the like.
(9) The MODEL ST-306 has an auto repeat function in which the time is upcounted and downcounted at
fixed intervals to sound a buzzer at a preset time. Accordingly, MODEL ST-306 can be used as a
pace-clock..
(10) The MODELST-306 is battery-powered, and can be used both indoors and outdoors. (Note, however,
that it cannot be installed outdoors permanently.)
(11) The MODEL ST-306 can be used in combination with a wide variety of SEIKO sports equipment.
3 PACKING LIST
･ Sports timer, Model ST-306
･ Grip switch (stored in an exclusive compartment)
･ Battery box (stored in an exclusive compartment)
･ Manual
※Check off the above at the time of unpacking inspection

I‑5039
8
4 NOMENCLATURE AND FUNCTIONS
(１) Sports Timer
(２) Grip Switch
Note: In this manual, the lap time and split time are defined as follows:
Start
Split time = Time required to cover a distance from the start to
a given point. (Time elapsed from the start)
Lap time = Time required to cover a given section of the
whole distance. (Interval time)
START/STOP Switch
Grip switch connector
LAP/SPLlT/RESET Switch
LAP
STLlT
R
ESET
START
STOP
Cable x ５ｍ
17
φ60
1000
20
Control box Storage
compartment
150
Front view
Buzzer
330
φ12
(1230)
M8
10
400
Mounting hole
23
200
45
Bottom view
Righthand side view
Lefthand side
view

I‑5039 9
(３) Battery Box
Battery box connector
Battery box mounting
pin(captive)
66.425.5
147.4
18 119.4 10

I‑5039
10
(４) Control panel (lefthand side panel)
RANGE switch
Used to set the minimum unit o
f
time measurement.
COUNT switch
Used to select the counting mode
(a) upcount mode, b) downcount
mode,
(b) c) crossover counting mode
(downcount through upcount)
REPEAT switch
To be turned ON when the MODEL
ST-306 is used as a cyclic timer in the
downcount or upcount mode. When
turned ON in the crossover counting
mode, the MODEL ST-306 will not
sto
p
at the crossover
p
oint
(
zero
)
.
MEMORY switch
Used to select lap or split time fo
r
memory. Up to 25 time data sets can
be stored (only in the upcount mode).
BUZZER switch
Used to set the beeping duration to 1
sec. or 5 sec. when it is on
MAX TlME switch
Used to set the maximum time fo
r
dis
p
la
y
.
DlSPLAY switch
Used to select a display operatin
g
mode: a) ON, b) OFF, c) AUTO
(externally controlled)
FlGURE switch
Used to shift the place at which to
enter a figure. When the FIGURE
switch is given a push, 0 will appea
r
in the more lefthand place of the
display. At every push of the FIGURE
switch, 0 will step rightwards.
0〜9switch
Used to set the time or points. The
number at the place selected by the
FIGURE switch can be changed
incrementally from 0 to 9. When 9 is
reached, a push cycles the number
back to 0, from which the same
incremental process can be repeated.
BATT.CHECK meter
Used to check the level of electric charge
remaining in the battery. When the battery is
running short, the red lamp alone will light up
to prompt you to replace the battery.
PUSH(battery check) switch
When this switch is pressed, the BATT.
CHECK meter will be illuminated for 3
seconds
POWER switch
Used to turn on and off the power supply to
the MODEL ST-306
FUNCTlON switch
Used to select a function number for a
specific application before turning on the
POWER switch
READ switch
Used to call forth a maximum of 25 data sets
stored
SET switch
When this switch is pressed, the settings are
committed to memory.
Battery box connector
A connector used to terminate the battery
box or other power supply. (Connector:
PRC05-R3M, Tajimi)
Battery box compartment
Used to accommodate the
battery box.
RANGE
COUNT
REPEAT
MEMORY
BUZZE
DｌSPLAY
MAX TｌME
FｌGURE 0〜9 SET READ
FUNCTｌON
OFF ON
PUSHBATT.CHECK
POWER
1 1/10 1/100
UP DOWN D→U
OFF ON
LAP SPLlT
OFF 1 5
OFF AUTO ON
99h 24h Time
BATT. lN
00

I‑5039 11
(５) Storage panel (righthand side panel)
Grip switch connector
A connector to terminate the grip switch o
r
other SEIKO sports timing equipment.
(Connector: PRC05-R8F, Tajimi)
Start signal input connector
A connector to terminate the
electronic starter PS-107/105.
(Connector: PRC05R2F, Tajimi)
Grip switch storage compartment
A compartment to store the grip switch
START.lN GRlP/EXT.
Grip switch connector
A connector to terminate the grip switch o
r
other SEIKO sports timing equipment.
(Connector: PRC05-R8F, Tajimi)
Start signal input connector
A connector to terminate the
electronic starter PS-107/105.
(Connector: PRC05R2F, Tajimi)

I‑5039
12
5 PREPARATIONS BEFORE OPERATION
(1) Battery
Set eight AA alkali dry cells (LR6) or AA manganese dry cells (R6PU) in the battery box.
※The dry cells are not furnished with the MODEL ST-306.
● Battery handling precautions
STRICTLY OBSERVE THE FOLLOWING PRECAUTIONS
FAILURE TO OBSERVE THESE PRECAUTIONS MAY LEAD TO EXPLOSION, ELECTROLYTE
LEAKAGE, AND EXOTHERMIC REACTION OF DRY CELL, CAUSING INJURIES AND
ENVIRONMENTAL POLLUTION.
Never use any power supply other than AA alkali dry cell (LR6) or
manganese dry cell (R6PU).
Do not use different types of dry cells together
Do not use old and new dry cells together. When loading the instrument
with dry cells for the firs
t
time or when replacing spent dry cells, be
sure to use a battery of new dry cells.
CAUTIO
N
When setting the dry cells into the instrument, do not mistake their
plus and negative poles for each other. Place them in the battery hatch
oriented as instructed. If the dry cells are set in the wrong directions,
instrument failure and other troubles may result.

I‑5039 13
(2)Battery box connection
[Installation of battery box]
① あらかじめ電池ボックス取付つまみを
方向へ引いた状態にし、電池ボックスを
本体の背面に沿うように入れます。
電池ボックス取付つまみの先端を本体側の
〔注〕必ず電池ボックスのコネクタを本体に
接続する前に行ってください。
Battery box
mounting pin
Tip of the pin
Terminate to ST-306 connector after
mounting the battery box in position.
1) Top view
Top View
1) Pull the mounting pins in the arrow direction in advance,
and insert the battery box into the back as illustrated
t
o
the proper position.
NOTE: The installation of the battery box must be done
prior to connecting the battery box connector to the
BATT.IN connector of the MODEL ST-306. This is
to prevent the battery box connector cable from
being damaged by strains.
2) Press the battery box mounting pins in the arrow
direction until it clicks into position. Make sure that
t
he battery box is fastened firmly to the MODEL
ST-306.

I‑5039
14
③ 最後に、電池ボックス側のコネクタを
本体のBATT.lN コネクタに差し込みます。
[How to remove the battery box]
First diconnect the battery box connector from the BATT.IN connector of the MODEL ST-306. Give a light
pull to the battery box mounting pins to disengage the battery box from MODEL ST-306, and pull out the
battery box toward you.
(For removal, follow just the reverse of the mounting steps 1), 2) and 3).)
BATT．lN
Lefthand side
view 3) Finally, insert the battery box connector into the
BATT.IN connector on the MODEL ST-306.
Lefthand
side
CONNECTION:
Hold the connector
as illustrated, align
the groove with the
guide key, and insert
straight until clicked
into position.
DISCONNECTION:
Hold and pull the
connector out as
illustrated.
CAUTION: Do not pull the battery box mounting pins
excessively. They may come off from the battery box.

I‑5039 15
(3) Connection of grip switch
(The procedure is the same as for the connection of battery box connector.)
Take out the grip switch from the storage compartment, and connect it to the GRIP/EXT. connector.
.
(4) Checkup of battery voltage
Turn ON the [POWER] switch (on the control panel),
and push the BATT.CHECK box to read the battery check meter.
*If the red lamp alone lights up, the battery must be replaced
immediately because the MODEL ST-306 will not work properly.
(Under such condition, the display may fail to drive the display elements properly.)
CAUTION
When replacing the dry cells, strictly observe the precautions instructed
under the heading, BATTERY HANDLING PRECAUTIONS. Failure to
observe the precautions may lead to serious injuries and environmental
pollution
(5) Self-check operation
Check all display digits before operation as follows. [Display sequence]
Set FUNCTION to 00. Black
Hold down the 0-9 switch and [SET] switch
simultaneously for more than 3 seconds. 0
Release the switches as soon as the self-check sequence
starts. 1
The self-check sequence is run for one cycle only. To
repeat the cycle, hold down the 0-9 switch and [SET]
switch simultaneously for more than 3 seconds again.
.
.
.
Black
(6) Measurement and display range
RANGE switch setting
(minimum indicating unit) Maximum display time Remarks
1s 99h59m59s In case MAX TIME is 99h
1／10s 59m59s9
1／100s 59m59s99
During counting, the fractions of
a second are blacked out.
NOTE: When the MODEL ST-306 is operated on an external display signal, its time display will follow
the RANGE switch setting.
BATT.CHECK
(OK)
Red Green
BATT.CHECK
(To be replaced)
Red
Righthand
side CONNECTION:
Hold the connector
as illustrated, align
the groove with the
guide key, and
insert straight until
clicked into
position.
DISCONNECTION:
Hold and pull the
connector out as
illustrated.
As soon as the display is turned
black, the buzzer will sound for
about 5 seconds

I‑5039
16
6 INSTALLATION OF SPORTS TIMER
(1) Standard installation
In installing the MODEL ST-306, follow the instruction below.
WARNING
Mount the MODEL ST-306 firmly on a sturdy, level place in a
manner that it will not fall over under the influence of wind, vibration
or shock. Failure to observe this precaution may result in injury to
personnel or damage to the instrument
(2) Installation using optional attachments
When installing the sports timer using the stand (ST-20), firmly tighten
up the fastening screws. If precariously installed, the MODEL ST-306
may yield and fall under wind pressure, vibration or shock, causing
serious injury to personnel or damage to the instrument.
WARNIN
G
When the sports timer is mounted on the stand (ST-20), never use it
when the wind is blowing at a velocity of 15m/s or more. Failure to
observe this precaution may cause fatal accident amd property
damage.
(b) Roof rack attachment (ST-21)
This option is an option used for mounting the sports
timer on the car roof. Mount the sports timer according
to the ST-21 manual. Depending on the type of car, the
roof rack attachment may not fit. For details of the
roof rack, consult your nearby car accessories dealer.
When installing the sports timer using the stand (ST-20) or car roof
rack attachment (ST-21), firmly tighten up the fastening screws. If
precariously installed, the instrument may yield and fall under wind
pressure, vibration or shock, causing serious injury to personnel or
damage to the instrument.
WARNING
When the sports timer is mounted on the car roof rack using the
attachment (ST-21), limit the car speed to less than 30km/h. Failure
to observe this precaution may cause fatal accident and property
damage due to fall of the instrument.
(a)Stand (ST-20)
This stand is used to mount the sports timer, MODEL
ST-306.
Fasten the MODEL ST-306 to the stand (ST-20) with
screws according to the ST-20 manual.

I‑5039 17
(c) Team name display unit(ST-24)
This is mounted on top of the sports timer,
MODEL ST-306, to display the team names
and set points. The unit has two slotted
screens, each accommodating a card board or
film showing the team name. For details,
refer to the ST-24 manual
(PROCEDURE FOR ASSEMBLING
AND INSTALLATION).
WARNING
When installing the team name display unit (ST-24), be sure to engage
the round bars into the mating holes and tighten up the thumb nuts
firmly. Failure to observe this precaution may cause serious injury to
personnel due to fall of the display unit under the influence of wind,
vibration or shock.
１
Team name dis
p
la
y
block Team name display block
Winner display magnet mounting block
ST‑306
２
３
４
５

I‑5039
18
7 SETTING OF FUNCTION SWITCH
This is a two-digit switch used to select a function number for a specific application.
Note:
To change the FUNCTION switch setting (function number), turn off the POWER switch first, change the
FUNCTION switch setting, and then turn on the POWER switch again. The FUNCTION switch is disabled
while the MODEL ST-306 is in operation. The MODEL ST-306 will not work when the FUNCTION switch is
set at any number other than specified as effective in the list on page 42.
Confirmation of FUNCTION switch setting (function number)
[Ex.] When the FUNCTION switch is set at xx:- (x: 0-9)
1) Set the POWER switch to ON.
2) The entire display will be blacked out.
3) The function number which has been set will be displayed preceded
by code F- for 1 second. (F-xx) (F-00 in the illustrated example)
4) The MODEL ST-306 will operate as directed by a specific combination
of the parameter settings of the switches.
Where a function number not appearing on the function number list (p. 42) is set:-
[Ex.] When the FUNCTION switch is set at 18:-
1) Turn ON the POWER switch.
2) The entire display will be blacked out.
3) The function number which has been set will be displayed
preceded by code F-. (F-xx) (F-18 in the illustrated example)
4) The display will freeze at F-xx.
5) Turn off the POWER switch, correct the FUNCTION switch setting, and then turn ON the POWER
switch again.
00
FUNCTlON
upper digit Lower digit
Minus button
Plus button
①
②
③
④
①
②
③

I‑5039 19
8 APPLICATION (1): UPCOUNTING MODE
UPCOUNTING
Display of: Running time, lap time, split time and finish time
(1) Upcounting from "0"
(a) Initial settings
1) Set the FUNCTION switch at 00.
2) Turn on the POWER switch.
3） Set the slide switches as shown at right
By setting the RANGE switch, the display will show:
1/100Ｓ
1/10Ｓ
1Ｓ
NOTE: The decimal fractions of a second (1/10s digit and 1/100s digit)
will not be displayed during counting..
RANGE
COUNT
REPEAT
MEMORY
BUZZER
DｌSPLAY
MAX TｌME
FｌGURE 0〜9 SET READ
OFF ON
PUSHBATT.CHECK
PO
W
ER
1 1/10 1/100
UP DOWN D→U
OFF ON
LAP SPRIT
OFF 1 5
OFF AUTO ON
99h 24h Time FUNCTｌON
00
Set the RANGE switch.
UP
OFF
Set the MEMORY switch to
LAP time or SPLIT time.
In the upcounting mode, the
buzzer will not beep
irrespective of the BUZZER
switch position
The display is enabled
irrespective of the DISPLAY
switch position
Set the maximum display
time
Set the FUNCTION
switch at 00.