Tusa DC-Solar IQ 1204 User manual

DC-SolarIQ1204DiveComputer
Owner’sManual
1st.
EN60950-1/EN300 328/EN301 489-1/EN301 489-17/EN62479/
EN13319*
* when you switch to Manual Dive Mode
The CE mark is used to mark conformity with the European Union
EMC directive2004/108/EC.

1
Thank you for your selection of the TUSA IQ-1204 Dive Computer.
◆This dive computer does not conform to
the diver watches(100m) stated in the ISO6425 and JISB7023.
Applications
This is a dive computer to support no decompression dive safely.
Solar panel generates electric power to run the dive computer.
It has multi-functions as watch, alarm, timer, stopwatch, direction
compass and angle, world time watch in the Time mode, and
surface interval time and desaturation time (DESAT time) in surface
interval. In the Dive Mode, information of water depth, water
temperature,dive time, ascent speed and decompression are
provided. When divers exceeds no decompression limit, the dive
computer gives divers alarm with display.
IQ1204 is compatible with a mixture of four different Nitrox gases.
Comprehensive accelerated decompression is possible because
each fraction of oxygen (FO2)% can be set from 21% to 100% in
1% increments.
The calculation model we use for the decompression program of
the dive computer is based on the decompression theory of Dr. A.
A. Buhlmann.
Before use, you need understand how to use, all warnings and
cautions of the dive computer written on this Instruction Manual.
To avoid any serious accidents, please make sure to read and fully
understand the dive computer. If you have any questions, please
ask the shop you purchased the dive computer.
Whenever there is something you do not know in how to use the
dive computer, we strongly recommend that you access the TUSA
website and read this instruction manual carefully.
Understanding and using the functions of the dive computer
ensures safe dive you can enjoy.

2
Safety Precautions
Please read the followings before use.
TUSA shall assume no responsibility on damages, lost profit
and/or any claims caused in use or by malfunctions of this dive
computer from customers and any third parties.
Danger
• Make sure to understand how to use, warnings, and cautions
of this dive computer with this Instruction Manual completely
before use. Confirm that you understand how to use the dive
computer in closed water as in a pool before using in open
water.
• When using the dive computer in scuba diving, you need to take
dive training course both in learning rules and practical skills,
and obtain C card (certification card) issued by internationally
acknowledged dive training organizations beforehand. (You
can use the dive computer in the training under the guidance of
instructors of such organizations)
• When using the dive computer in Nitrox (EANx) dive, you need
to take Nitrox (EANx) dive training course and complete it
beforehand. Otherwise, do not use the dive computer in Nitrox
(EANx) dive.
Ref: EANx: Enriched Air Nitrox (commonly called Nitrox).
It is mixed gas with higher FO2% than normal compressed air
(FO2is 21%)
• If “Decompression stop violation” warning and/or “Out of
measurement range” warning are released, cancel dive for a day
and pay attentions on changes of your physical condition.
• When you notice abnormal conditions on the dive computer,
stop using it immediately and contact the shop you purchased
the dive computer.

3
• Check the battery power level is “H” before dive. If power level
gets low and warning (WARNING!! BATT) is released while dive,
exit as soon as possible and recharge the dive computer.
●Even this warning is released in dive, enough power for dive
remains. Deal with the situation calmly without panic.
Ref. Power Levels … P.13
• Follow the displayed warnings and messages for cautions on the
dive computer at once.
• When using the dive computer, also use other devices as
another dive computer, divers watch, and depth indicator
together as backup tool.
• The dive computer is to be used for recreational dive only.
Do not use the dive computer for any other dive.
• Never lend or share the dive computer with anyone else if
residual nitrogen still exists in the body after use of the dive
computer.
• Make sure to set FO2% in every dive. It is extremely dangerous
if FO2% in tank and in the dive computer don’t match.
• Dot not disassemble, repair, modify, exchange the secondary
battery or conduct pressure chamber test on the dive computer
by yourself. This will be extremely dangerous since doing this
without sufficient knowledge causes malfunction.
• Check out the dive computer by yourself once a year regardless
of frequency of use. Especially, check it out definitely when you
have not used the dive computer for more than 3 months since
last dive season.

4
• The dive computer is applicable to the air with FO221 % and
Nitrox (EANx) gas with FO222-100%. (4 mixture gases are
available). The dive computer can not be used with any other
mixed gas.
• Each diver should be responsible in planning and conducting of
safety dive according to each diver’ s condition.
• Please try cautious dive not exceeding the displayed data in
the dive computer. The dive computer can not prevent from
developing decompression illness completely.
• The dive computer does not measure, display and control the
air pressure in tank. Use the residual air pressure indicator and
check it by yourself.
• When removing the secondary battery from the dive computer,
be careful for small children not to swallow it. Put the battery out
of reach of children. If swallowed, contact a doctor at once.
• Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type.
• Do not exposed to excessive heat such as direct sunshine in
the car, near the heater, fire or the like.
CAUTION!

5
Contents
1. About This Instruction Manual ............................................ 10
2. Things To Check Before Using The Dive Computer.......... 10
3. Charging the Dive Computer ............................................... 11
Charging Guide........................................................................................ 11
Power Levels ........................................................................................... 13
Power Recovery Mode ............................................................................ 14
Charging Times........................................................................................ 15
Power Saving........................................................................................... 16
To Recover From The Sleep State........................................................... 16
Low Power Alarm..................................................................................... 17
4. Mode Reference Guide ........................................................ 18
Selecting A Mode .................................................................................... 19
General Functions (All Modes)................................................................. 20
Auto Return Features............................................................................... 20
Initial Screens .......................................................................................... 20
Scrolling................................................................................................... 20
5. Timekeeping.......................................................................... 21
6. Configuring Home City Settings.......................................... 22
To configure Home City and Daylight Saving Time Settings................... 22
7. Configuring Current Time and Date Settings..................... 23
To Change The Current Time And Date Settings .................................... 23
Specifying Temperature and Depth Display Units................................... 24
8. Displays In The Surface Mode............................................. 26
9. Dive Mode (DIVE) .................................................................. 27
How To Switch The Mode To Dive Mode................................................ 27
No Decompression Mode........................................................................ 28
Safety Stop .............................................................................................. 29
What Makes “Safety Stop Function” End................................................ 29
No Decompression Limit (NDL) Warning................................................. 30
Decompression Dive................................................................................ 30
The Below Information Is Shown In Decompression Dive....................... 31
Warnings In Dive...................................................................................... 32
Ascent Rate ............................................................................................. 32

6
Warning Of Three Minutes To Decompression........................................ 32
Decompression Dive................................................................................ 32
Decompression Stop Violation ................................................................ 33
Out Of Measurement Range.................................................................... 34
O2Indicator (OLI) ..................................................................................... 35
PO2.......................................................................................................... 35
M Value.................................................................................................... 36
Nitrox (EANx) Dive ................................................................................... 36
End Of Dive.............................................................................................. 37
Dive At High Altitude................................................................................ 38
10. Log Mode (LOG).................................................................... 39
How to use L) Log Button
(Dive Log, Dive Profile, Dive History Mode, Bluetooth log data transfer) 39
(Scuba) Dive Log Mode ........................................................................... 40
Dive log confirmation............................................................................... 41
How to view the log data ......................................................................... 41
Button operation...................................................................................... 42
Oxygen concentration ............................................................................. 43
Warnings recorded in the log................................................................... 43
Dive Profile Mode .................................................................................... 44
Confirm dive profile.................................................................................. 44
Dive History Mode / Free Diving History Mode ....................................... 46
Dive History.............................................................................................. 46
Free Diving History .................................................................................. 47
Dive history clear / Dive number edit function......................................... 48
Dive profile sampling time settings.......................................................... 48
Setting method ........................................................................................ 48
O2profile save settings............................................................................ 49
Setting method ........................................................................................ 49
Bluetooth (BLE) data transfer mode ........................................................ 50
11. Plan Mode (PLAN)................................................................. 52
Plan Dive.................................................................................................. 52
Enriched Air, Nitrox Diving....................................................................... 53
FO2% Setting ........................................................................................... 54
Default...................................................................................................... 55
Oxygen-Pressure Warning And Bodily Oxygen Quantity Warning.......... 55
Bodily Oxygen Quantity Warning............................................................. 56
Oxygen Partial Pressure Warning............................................................ 56

7
Multiple Gas Settings Diving (Accelerated Decompression) ................... 57
How to switch the gas ............................................................................. 57
Regarding The Accelerated Decompression Log.................................... 58
Set Safety Factor ..................................................................................... 58
Safety Factor setting................................................................................ 59
Set M Value Warning ............................................................................... 60
Depth Interval Alarm ................................................................................ 61
Setting Of Depth Interval Alarm ............................................................... 61
Setting Range .......................................................................................... 62
Maximum Water Depth Warning Settings ............................................... 62
Setting Method ........................................................................................ 62
Setting Range .......................................................................................... 63
UPTD Pulmonary Oxygen Poisoning Units (Total Minutes Per Day/Week)
Display ..................................................................................................... 63
12. Using The Compass ............................................................. 65
To Take A Direction Reading ................................................................... 65
Digital Compass Readings ...................................................................... 66
Calibrating The Bearing Sensor............................................................... 67
Bidirectional Calibration........................................................................... 67
Precautions About Bidirectional Calibration............................................ 67
To Perform Bidirectional Calibration........................................................ 68
Digital Compass Precautions .................................................................. 69
Magnetic North And True North .............................................................. 69
Location ................................................................................................... 69
Storage .................................................................................................... 70
13. Using The Stopwatch ........................................................... 71
To Enter The Stopwatch mode................................................................ 71
To Perform An Elapsed Time Operation.................................................. 71
14. Using The Countdown Timer ............................................... 73
To Enter The Countdown Timer Mode .................................................... 73
To Specify The Countdown Start Time.................................................... 73
To Perform A Countdown Timer Operation............................................. 74
To Stop The Alarm................................................................................... 74
15. Using The Alarm.................................................................... 75
To Enter The Alarm Mode........................................................................ 75
To Set An Alarm Time.............................................................................. 76
To Turn An Alarm And The Hourly Time Signal On And Off .................... 77

8
To Stop The Alarm................................................................................... 77
16. Checking The Current Time In A Different Time Zone ...... 78
To Enter The World Time Mode............................................................... 78
To View The Time In Another Time Zone................................................. 78
To Specify Standard Time Or Daylight Saving Time (DST)
For A City................................................................................................. 79
17. Illumination............................................................................ 80
To Turn On Illumination Manually ............................................................ 80
To Change The Illumination Duration ...................................................... 81
About The Auto Light Switch................................................................... 82
To Turn The Auto Light Switch On And Off ............................................. 83
Illumination Precautions........................................................................... 84
Auto Light Switch Precautions ................................................................ 84
18. Other Settings ....................................................................... 85
To Turn The Button Operation Tone On And Off..................................... 85
To Turn Power Saving On Or Off............................................................. 86
Dive Mode Screen Setting (To select the basic screen in dive) .............. 87
Mode Switching ON/OFF Setting ............................................................ 87
19. Free Diving (FREE) Mode ..................................................... 88
Switch To Free Diving Mode.................................................................... 88
End of Free Diving Mode ......................................................................... 89
Free diving functions ............................................................................... 89
Button operation (underwater / water surface)........................................ 90
Session history ........................................................................................ 91
Log of maximum water depth for session ............................................... 91
Log of longest dive time for session........................................................ 92
Compass / StopTime............................................................................... 92
Free Diving Log........................................................................................ 92
How to read log data ............................................................................... 93
Free Diving History .................................................................................. 93
20. Gauge Mode .......................................................................... 94
Setting Of Gauge Mode........................................................................... 94
Canceling Gauge Mode ........................................................................... 95
21. Troubleshooting.................................................................... 96
Time Setting............................................................................................. 96
Dive Mode and Surface Mode................................................................. 96

9
World Time Mode .................................................................................... 99
Charging .................................................................................................. 99
23. Specification........................................................................ 101
Accuracy at normal temperature ........................................................... 101
Timekeeping .......................................................................................... 101
Calendar system.................................................................................... 101
Other...................................................................................................... 101
Sensor precision: ................................................................................... 101
FO2% .................................................................................................... 101
Water proof............................................................................................ 102
Max. dive log ......................................................................................... 102
Digital Compass..................................................................................... 102
Bearing Sensor Precision ...................................................................... 102
Stopwatch.............................................................................................. 102
Countdown Timer .................................................................................. 102
Alarms.................................................................................................... 102
World Time............................................................................................. 102
Other...................................................................................................... 103
Illumination............................................................................................. 103
Power Supply......................................................................................... 103
City Code Table ..................................................................................... 104

10
1. About This Instruction Manual
• Button operations are indicated using the letters shown in the
illustration.
• Note that the dive computer illustrations in this Instruction
Manual are intended for reference only, and so the actual dive
computer may appear some what different than depicted by an
illustration.
2. Things To Check Before Using The Dive Computer
1. Check the battery power level.
Is “H” or “M” displayed for the battery power
Go to step 2.
Power is low.Charge the IQ1204 by placing it in a
location where it is exposed to light. For details,
see “Charging the Dive Computer”.
SEYON
YES
Does any one of the following conditions exist?
•Battery power indicator shows “L” and “LOW ” is
flashing on the display.
•“CHG” is flashing on the display.
•The face is blank.
The IQ1204 is charged
sufficiently.
For details about charging, see
“Charging the Dive Computer”
NEXT
Battery power
indicator
indicator. (Page.13)
(Page.11)
(Page.11)

11
2. Check the Home City and the daylight saving time (DST) setting.
Use the procedure under "To configure Home City and summer
time settings" to configure your Home City and daylight saving
time settings.
World Time Mode data depends on correct Home City, time,
and date settings in the Time mode or Surface Mode.
Make sure you configure these settings correctly.
Important!
3. Set the current time.
See "Configuring Current Time and Date Settings
3. Charging the Dive Computer
The face of the dive computer is a solar panel that generates
power from light. The generated power charges a built-in
rechargeable battery, which powers dive computer operations.
The dive computer charges whenever it is exposed to light.
Charging Guide
Whenever you are not wearing the dive computer,
leave it in a location where it is exposed to light.
• Best charging performance is achieved by exposing
the dive computer to the strongest light available.

12
When wearing the dive computer, make sure that its
face is not blocked from light by the sleeve of your
clothing.
• The dive computer may enter a sleep state if its
face is blocked by your sleeve even only partially.
Leaving the dive computer in bright light for charging may
make it become quite hot.
Take care when handling the dive computer to avoid burn
injury. The dive computer can become particularly hot
when exposed to the following conditions for long periods.
• On the dashboard of a car parked in direct sunlight
• Too close to an incandescent lamp
• Under direct sunlight
Warning!
• Allowing the dive computer to become very hot can cause
its liquid crystal display to black out. The appearance of the
LCD should become normal again when the dive computer
returns to a lower temperature.
• Turn on the dive computer's Power Saving function and keep
it in an area normally exposed to bright light when storing it
for long periods. This helps to ensure that power does not
run down.
• Storing the dive computer for long periods in an area where
there is no light or wearing it in such a way that it is blocked
from exposure to light can cause power to run down. Expose
the dive computer to bright light whenever possible.
Important!

13
Power Levels
You can get an idea of the dive computer's power level by
observing the battery power indicator on the display.
Battery power
indicator
AL
PM
t
Level Battery Power Indicater Function Status
1
(H)
All functions enabled.
2
(M)
All functions enabled.
3
(M)
・
(CHG)
Mode cannot be changed to Dive Mode.
4
(L)
Illumination, beeper, and sensor operation
disabled.
5
(CHG)
Except for the current time and the CHG
(charge) indicator, all functions and display
indicators disabled.
6 – – – All functions disabled.
• When (M) is on and (CHG) blinks at the Level 3 (Mand CHG),
and all other display is shown OK, mode cannot be changed to
Dive Mode from 5 hours after then. (You can not dive.)
• The blinking LOW indicator at Level 4 (L) tells you that battery
power is very low, and that exposure to bright light for charging
is required as soon as possible.
• At Level 6, all functions are disabled and settings return to their
initial factory defaults.

14
Once the battery reaches Level 2 (M) after falling to Level 6,
reconfigure the current time, date, and other settings.
• Display indicators reappear as soon as the battery is charged
from Level 6 to Level 2 (M).
• Leaving the dive computer exposed to direct sunlight or some
other very strong light source can cause the battery power
indicator to show a reading temporarily that is higher than the
actual battery level.
The correct battery level should be indicated after a few minutes.
• All data stored in memory is deleted, and the current time and
all other settings return to their initial factory defaults whenever
battery power drops to Level 6 and when you have the battery
replaced.
Power Recovery Mode
• Performing multiple sensor, illumination, or alarm operations
during a short period may cause all of the battery power
indicators (H, M, and L) to start blinking on the display. This
indicates that the dive computer is in the power recovery mode.
Illumination, alarm, countdown timer alarm, hourly time signal,
and sensor operations will be disabled until battery power
recovers.
• Battery power will recover in about 15 minutes. At this time, the
battery power indicators (H, M, and L) will stop blinking.
This indicates that the functions listed above are enabled again.
• If all of the battery power indicators (H, M, L) are blinking and the
CHG (charge) indicator also is blinking, it means the battery level
is very low. Expose the dive computer to bright light as soon as
possible.

15
• Even if battery power is at Level 1 (H) or Level 2 (M), the Digital
Compass Mode, Dive Mode sensor may be disabled if there
is not enough voltage available to power it sufficiently. This is
indicated when all of the battery power indicators (H, M, L) are
blinking.
• Frequent blinking of all of the battery power indicators (H, M, L)
probably means that remaining battery power is low. Leave the
dive computer in bright light to allow it to charge.
Charging Times
〔Recharging time 〕
Condition (luminance)
Recharging hours needed
for a dive from the time low
power alarm is released.
Recharging hours needed
to full charge from the time
low power alarm is released.
Outdoor sunlight (50,000 lux) 1 hrs. 8 hrs.
Sunlight through a window
(10,000 lux) 2 hrs. 30 hrs.
Daylight through a window
on a cloudy day (5,000 lux) 4 hrs. 60hrs.
Indoor fluorescent lighting
(500 lux) 36 hrs. ・・・・・・
• Actual exposure times depend on lighting conditions.
• For details about the operating time and daily operating
conditions, see the "Power Supply" section of the Specifications.

16
Power Saving
When turned on, Power Saving enters a sleep state automatically
whenever the dive computer is left for a certain period in an area
where it is dark.
The table below shows how dive computer functions are affected
by Power Saving.
• For information about enabling and disabling power saving, see
"To Turn Power Saving On And Off". (P. 86)
• There are actually two sleep state levels: "display sleep" and
"function sleep".
Elapsed Time in Dark Display Operation
60 to 70 minutes (display sleep) Blank Display is off, but all functions are enabled.
6 or 7 days (function sleep) Blank
All functions are disabled, but timekeeping
6 or 7 days (function sleep) Blank is
maintained.
• The dive computer will not enter a sleep state between 6:00 AM
and 9:59 PM. If the dive computer is already in a sleep state
when 6:00 AM arrives, however, it will remain in the sleep state.
• The dive computer will not enter a sleep state while it is in the
Dive Mode, Stopwatch Mode or Countdown Timer Mode. In
Surface Mode, display becomes blank but functions are enabled.
To Recover From The Sleep State
Move the dive computer to a well-lit area, press any button, or
angle the dive computer towards your face for reading.

17
Low Power Alarm
For safe dive, when power becomes too low to dive, Low power
alarm is on with message to urge divers to recharge the power.
Since sensors of the dive computer would not function when
power level becomes (L), dive is not allowed. Suppose you started
dive with the power level (M), and it becomes (L) while dive, no
information related the dive is shown anymore.To avoid this
dangerous situation, when power becomes too low to dive, you
can not dive until the power becomes high enough for dive.
Diving functions disabled
High
Middle
Low
①Diving is available①
②
(Pressure sensor does not work)
Battery warning level Can not move to
diving mode
Normal condition
(Pressure sensor works OK)
②Warning is released
Current mode Displayed alarms
Time mode or Surface Mode [CHG] will blink
Dive Mode
[WARNING!! BATT] will scroll from right to left 5 times,
and [M] on the lower side of the display will blink.
[WARNING!! BATT] will be re-shown every minute.
Alarm will be on for 6 seconds
◆The alarm will continue until power becomes high enough for
dive. No dive is allowed when the alarm is on.

18
4. Mode Reference Guide
Your dive computer has 13 "modes". The mode you should select
depends on what you want to do.
Mode types and how to switch them:
The below shows mode types and how to switch them.
Modes Functions Ref. page
Time mode
and Surface Mode
(TIME)
To display current time, date, day21P
To view the current date in the Home City21P
To configure Home City and daylight saving
time (DST) settings 22P
To configure time and date settings23P
Surface Mode (TIME) To display desaturation time (DESAT time)24P
To display surface time24P
Dive Mode (DIVE) To display no decompression limit (NDL)28P
To display safety stop29P
To display NDL warning30P
To display decompression dive31P
To give warnings in dive32P
Nitrox (EANx) dive36P
Dive at high altitude38P
Log Mode (LOG) To display dive history39P
To display dive log41P
To display dive profile44P
Plan Mode (PLAN) To display dive plan52P
To set safety factor (SF)59P
To set FO2%54P
Digital Compass Mode To determine your current bearing or the
direction from your current location 65P
Stopwatch Mode To use the stopwatch to measure elapsed time71P
Countdown Timer Mode To use the countdown timer73P
Alarm Mode To set an alarm time76P
World Time Mode To view the current time in one of 48 cities
(31 time zones) around the globe 78P
Free Diving (FREE) Mode To use the Free Diving Mode88P
Gauge Mode To use the Gauge Mode94P

19
Selecting A Mode
• The illustration below shows which buttons you need to press to
navigate between modes.
Countdown
Timer Mode
Alarm Mode
Stopwatch Mode Digital compus Mode
Time Mode
Plan modeLog ModeDive Mode Free Diving Mode
Hold(1.5 sec.)
+
World Time
Mode
M
M
M M
M M
Mt
PL
+Mt