Info Manual

Let us take a look inside the speedometer panel of a suzuki shogun 125cc, as shown on the left with speedometer pointer  and lcd remove. The main controller of this panel is a chip made by fujitsu with part number MB89943 which is an 8-bit cpu, controlling everything from the movement of the speedometer needle, lcd display. and counter. Data then are stored like odometer, speedometer reset, fuel gauge calibration on the a microwire bus eeprom with part number L46R.


 Shogun 125cc user espescially those 2006 model and below experiencing odometer stuck up to 99,999.9 and uncapable of resetting itself back to zero..unfortunately newer model already have its own data stored on the eeprom that resets the odometer after reaching the said value.


The only solution to this problem is to inject the new data stored on newer speedometer panel eeprom to IC5 (L46R) by using an eeprom programmer like IC prog with interface such as tait serial programmer and or JDM programmer.

This is my digital tachometer i made a long time ago on my suzuki shogun 125cc and still in active up to date. The tachometer incorporates a programmable shift lights, the red line can be programmed depends on where to shift at a certified RPM...watch the video to see it in action.

Recently, a friend of mine is asking if i can repair his Honda Wave 125 S speedometer panel that is not functioning. No power, no activity. I said of course. so he handed it to me, and test. Before i opened the said panel, i needed to have a wiring diagram of the model, and here it is.
Although the picture seems blurred when i got it from a site, the color coding is enough for me to know which is the positive and negative line of the supply so that i can power up the board without having is entire bike, and so i powered the panel...NOTHING...no activity.







 My first visual inspection on the parts, i found out that one of the transistor at the regulator part have BLACK marks on its solder...it means it was burnt by a mistake somewhere by the owner on its motorcycle wiring that causes the panel to FAIL..


If you can see it on the picture TR102 solder, has a BLACK mark, so i immediately test it with my digital diode tester, Im not surprise of the outcome, there..the transistor pins are all shorted. in all probe points.

Digital speedometer like those found in a suzuki shogun 125 and raider 150 wherein there is no cable attached to front end of the bike uses the so called, GEAR TOOTH magnetic sensor, as shown in the picture.













This is bolted in the area where the front sprocket shaft is as shown below

As the gear spins or turns, each spline or tooth in it will be detected by the magnet as it passes and a corresponding electrical pulse is sent out. The faster the gear spins the faster the electrical pulses the sensor sends and thus a speed reading is made.

It is the end of the line for my shogun 125cc odometer reading which reads 99999.9 and it is been two weeks from now that it was stuck at that reading, and the only way to revert it back to zero is by injecting a new odometer data on its eeprom by using an eeprom programmer and a corresponding software plus an odometer value calculator that will convert any decimal value to hexadecimal that will be manually type to the specific eeprom address on the software window.

Years back, i posted this kind of panel,

what's inside on this link
Speedometer Panel


looking inside the panel will expose of course the entire board of the speedometer. This is digital and care must be consider handling this to prevent problems later on due to static electricity.

moving on

what we are eyeing is the IC with mark IC5 written on the board, that is the eeprom that store value for the odometer reading.