Question about Texas Instruments TI-84 Plus Calculator

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Keys not working

The row of keys including :ln  4  5  6  - does not register in either  first or second mode

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Same thing happened to me except its 7 4 and 1 along with the "apps" "sin" and "," keys and it just registers as a 0. ( when i press those keys it puts in 0 on screen)

Posted on Sep 04, 2008

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Posted on Jan 02, 2017

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Do I need a master key to reset my till


According to the user guide you can CLEAR RANDOM ACCESS MEMORY (RAM), by doing the following .

1) UNPLUG REGISTER

2)Turn the control lock to MC position with control key .

3)Connect the AC plug into power outlet WHILE pressing the C KEY .

4)When RAM is cleared of all MEMORY the register PRINTS a ROW of Cs .

DO THIS ONCE ONLY : hope this helps you.

Jan 06, 2016 | Sam4s Samsung Er-290 Cash Register

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Can my calculator do exponent calculations, "LN" calculations, and has memory capability? If so how do I use them?


Yes, yes, and yes.
You may view/download a copy of the manual at Owners Manual User Guide for Sharp el 531x scientific calculator
You'll find examples of exponential and logarithmic calculations in the second column of the second page and the memory instructions in the fourth column of the first page.

Jan 10, 2015 | Sharp el-531x scientific calculator

1 Answer

How can i use exponents and ln ?


For ln use the LN key on the top row of the keyboard. For e^x use the 2nd function of the LN key.

Dec 30, 2013 | Texas Instruments TI-30XA Calculator

2 Answers

I used csorb's instructions to reprogram a master key for my 2000 Lexus RX300. The ignition works perfectly, but the doors don't lock or unlock.


Hi!!
I believe your alarm is in the PASSIVE MODE, here is how it works.

PASSIVE MODE Setting (Arming) Anti-Theft System The system will automatically set 30 seconds after following methods are performed: Remove ignition key from ignition switch. Exit vehicle, and close all doors. After performing this, anti-theft indicator on left side of instrument panel will light continuously for about 30 seconds. After 30 seconds, anti-theft indicator will blink once per second. When system is set, doors cannot be locked or unlocked using door lock control switch.
CANCELING THE ALARM AND REPROGRAMING MAY SOLVE YOUR PROBLEM.
Canceling Anti-Theft System Setting (No Alarm) When system is set (armed), but alarm is not sounding, use one of following methods to cancel system setting:
  • Unlock left or right front door using key.
  • Unlock all doors using remote keyless entry system.
  • Insert key in ignition switch and turn to ON position (this is operative only when anti-theft system has not been triggered).
HERE IS HOW TO REPROGRAM THE ALARM IN CASE YOU NEED TO RESET IT.
PROGRAMMING
PASSIVE MODE NOTE:Initial mode is passive mode off. If there is a different signal in middle of programming, signal is invalid.
Programming Passive Mode Off
  • Remove ignition key from ignition key cylinder. Ensure all doors (including back door) and engine hood are closed and unlocked. Perform all of following methods within 30 seconds:
  • Lock or unlock any door with key or remote keyless entry system.
  • Open driver door.
  • Lock and unlock driver door lock knob 3 times.
  • After performing this, system should start force lock after 2 seconds. Perform all of following methods within 20 seconds:
  • Unlock driver door lock knob.
  • Close and open driver door 2 times.
  • Lock and unlock driver door lock knob.
  • After performing this, system should start force lock after 2 seconds. Passive mode should now be off.
Programming Passive Mode On
  • Remove ignition key from key cylinder. Ensure all doors, engine hood and luggage compartment door are closed and unlocked. Perform all of following methods within 30 seconds:
  • Lock or unlock any door with key or remote keyless entry system.
  • Open driver door.
  • Lock and unlock driver door lock knob 3 times.
  • After performing this, system should start force lock after 2 seconds. Perform all of following methods within 20 seconds:
  • Unlock driver door lock knob.
  • Close and open driver door 4 times.
  • Lock and unlock driver door lock knob.
  • After performing this, system should start force lock after 2 seconds. Passive mode should now be on.
If you need further assistance, please provide an email address to send more info on your security system
Good Luck!! A 4 THUMBS UP rating would be greatly appreciated for this solution. Thank you for using FixYa!!

Mar 01, 2011 | Lexus RX 300 Cars & Trucks

1 Answer

On the TI-36X, whihc key is the inverse key and


The inverse key is marked "1/x" (second key on the third row). The natural logarithm key is marked "LN" (fourth key on the top row).

Apr 13, 2010 | Texas Instruments TI-36 X Solar Calculator

1 Answer

Hp20s has locked up


Hi,
If the calculator has locked up you should perform a reset.
  1. Press and hold the [C] (ON/OFF) key
  2. Press and hold the [LN] key (third key from the left on the top row).
  3. Release both keys simultaneously. T
  4. The calculator should display "0.00" (if the number of decimal places is set to two.)
If that does not bring it to life you should perform a full memory reset

  1. Press and hold the [C] (ON/OFF) key.
  2. Press and hold the first key from the left ( the Square root x key) and the first key from the right (the SIGMA+ key ) on the top row.
  3. Release all three keys at the same time.
  4. Calculator should display "ALL CLr".
  5. To clear the message press the [C] (ON/OFF).
  6. The calculator should display "0.00."
If the calculator does not respond as expected,
  • Remove the batteries, and
  • with a metallic coin (and what coin is not metallica) short-circuit the calculator's electrical terminals.
  • Maintain the coin for about ten seconds.
  • Replace the batteries (preferably fresh ones) respecting the diagram inside battery compartment.
  • The Calculator should display "ALL CLr".
  • To clear the message press the [C] (ON/OFF).
  • The calculator should display "0.00."
If the calculator does not respond to the foregoing procedures, remove the batteries and leave them out of the calculator for 24 to 48 hours to drain capacitors.

If it continues to malfunction, it will need to be repaired. One repair shop in Pennsylvania, USA has a website at http://www.fixthatcalc.com. You should contact them.


Hope it helps.
Thank you for rating the solution.


Nov 05, 2009 | HP 20s Calculator

1 Answer

In need to find the natural log of (27/25). What


Hello,
Use the [LN] key, the fith key from the bottom, on the first row left to [EE] key
[LN] ( 27/25) [ENTER] . Make sure you put the fraction inside parentheses to prevent the calculator from interpreting it as LN(27)/25.
Hope it helps.

Oct 08, 2009 | Texas Instruments TI-85 Calculator

1 Answer

Why does my key fob only open drivers door


this how a dealer does it:
DOOR CONTROL TRANSMITTER
REGISTRATION
1. REGISTRATION OF RECOGNITION CODE
HINT:
 The add mode is used to retain the already registered codes while registering a new recognition code.
This mode is used when adding a transmitter. If the number of the registered codes exceeds 4, the previously
registered code will be correspondingly erased in order, starting from the first registered code.
 The rewrite mode is used to erase all the previously registered codes and register only new recognition
codes. This mode is used when exchanging the transmitter or the door control receiver for new one.
 The prohibition mode is used to erase all the registered codes and cancel the wireless door lock function.
Use this mode when the transmitter is lost.
 The confirmation mode is to confirm how many recognition codes have already been registered before
an additional registration of a recognition code.
 All the following registration procedures must be performed in order continuously.
(a) The vehicle should be in the following conditions.
(1) The key is not inserted in the ignition key cylinder.
(2) Driver’s door is OPENED. (The other doors are CLOSED)
(3) Driver’s door is UNLOCKED.
(b) Perform the following operations to select the desired mode.
(1) Insert and remove the key from the ignition switch twice within 5 seconds.
(2) After the above operations, close and open the driver door twice within 40 seconds. Then insert the
key into the ignition key cylinder and remove it.
(3) After the above operations, close and open the driver door twice within 40 seconds. Then insert the
key into the ignition key cylinder and close the door.
(4) Turn the ignition switch from LOCK to ON and back to LOCK at approximately 1 second interval 1
to 5 times to select a mode.(2 times for rewrite mode) Then remove the key from the ignition key cylinder.
(5) After selecting a mode, the integration relay automatically performs the power door
LOCK-UNLOCK operation within 3 seconds to inform the selected mode.
(c) Register the new recognition codes :
(1) Within 40 seconds after the add mode or the rewrite mode has been selected, press the LOCK and
UNLOCK switches on the transmitter switch simultaneously for 1.0 - 1.5 seconds.
Within 3 seconds after the previous operation, press either one of the switches for more than 1.0
seconds.
(2) Within 3 seconds after the transmitter switch has been turned OFF, the LOCK-UNLOCK operation
will be automatically performed once if the registration of the recognition code of the transmitter is
completed correctly. In case the LOCK-UNLOCK operation is performed twice, the registration of
recognition code has failed. Perform the registration procedure from the beginning once again.
(3) If the multiple transmitter to be registered, repeat step (c) within 40 seconds after the previous registration.
this is why the dealer charges for this

Jun 19, 2008 | 2003 Mini Cooper

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