Aprilia Easy SR50 - Digitek digital counter, board power supply

Hello.
I received a digital speedometer from an Aprilia SR50R scooter (carburetor) for repair - Crs designation. EASY SR50. A very similar meter is also used in the RS50 and RS125 motorcycles (they differ in the dial and LED placement on the board).
The counter was probably beaten by driving without a battery or a voltage pulse from the voltage regulator.

The power input diodes (+Bat and +Key), one 100µF/35V electrolytic capacitor (short circuit) and the LP2951 voltage regulator were damaged. After desoldering the damaged elements and substituting +5V, the counter started, everything seems to work correctly, the mileage on the counter is 760 km (!).


I have some doubts about one missing element, everything looks like it has been desoldered before. I can't find a photo of the board in high resolution anywhere, where you can see the designation of the element, only in this document you can see that it is a diode: http://etlweb.net.ua/prod_automotive_byke/files/APRILIA_EASY_RS50.pdf . It is blocked to ground, so it's either Zener or Transil... I found a photo of an older type of motorcycle counter, there is a Transil marked SMD GEW, i.e. 22V, I'm not sure if it will fit here. http://i234.photobucket.com/albums/ee281/rono...Bikes/Aprilia%20Dash%20Repair/DSCF4415cap.jpg If anyone had such a counter handy, please read the markings of this element.

The second thing is the voltage regulator, several versions are produced under this designation, differing in output voltage and housing. Can anyone tell me which version to choose?

I have an identical meter with the same fault and the item you are looking for is readable. I can send a photo.

I would like to ask for a fairly clear photo so that the designation of this diode can be read. Alternatively, please write down the markings.
I was looking for a voltage regulator in the largest Polish wholesalers and somehow I couldn't find the right version (with the right housing and voltage). Anyone have any suggestion?

The big one is a 22V 5A zener diode. I don't think it was desoldered before. In my case, it was loose in the housing. Under the influence of temperature at the short circuit, it desoldered itself. You can safely install.
At the LP2951 output (first leg) there is also a zener diode in the transistor housing. I put in a regular 5V1 and the counter works without a problem. LP'ka also suggests replacing. Unfortunately, no photos because I have already returned the meter (the customer is satisfied).

BANANvanDYK wrote:

I would like to ask for a fairly legible photo so that the designation of this diode can be read. Alternatively, please write down the markings.
I was looking for a voltage regulator in the largest Polish wholesalers and somehow I couldn't find the right version (with the right housing and voltage). Anyone have any suggestion?

Maybe one of these:

I meant the 2951 stabilizer, but it is out of date, I found it on Allegro

In the Aprilia SR 50 Factory meter, I have a damaged integrated circuit, I can't read its symbol, it is probably a 74HC stabilizing system ... Could someone send me the full designation of the system. Or a photo of the layout with markings. Thank you in advance.
Regards!

It's the chip marked in yellow
it is probably some kind of buffer with the designation 74ac and it still does not go to read, maybe someone has a spare or part of such a counter???

Is anyone able to repair the Aprilia SR 50 Factory meter on the carburetor?

@Mazep that's the arrangement


@bodzio012 the one marked in yellow is it


In my case, the SMD resistors marked in the picture burned, could you give their values?

In the picture I have visible resistors marked 1001, i.e. 1kΩ.
Can anyone tell me what type these transil diodes are? I don't like the pads for the pads according to Vishay catalogue. The second thing is where can I buy transiles and GN1M diodes? I still haven't fixed the meter, the client bought a second meter in Germany for 60 euros with a mileage of 500 km.

You can buy it at TME as S1M

BANANvanDYK wrote:

In the picture I have visible resistors marked 1001, i.e. 1kΩ.
Can anyone tell me what type these transil diodes are? I don't like the pads for the pads according to Vishay catalogue. The second thing is where can I buy transiles and GN1M diodes? I still haven't fixed the counter, the customer bought a second counter in Germany for 60 euros with a mileage of 500 km.

Thanks a lot, this transil will fit link and the rectifier diode link .

I will be ordering the parts I need from there.

Hello,
I will attach this topic, I need a photo of the plate from the bottom.
I have burnt paths, Photo would help.

Please, photos of the other side of the PCB.

can anybody repair my dashboard? can send!

Hello, I'll chime in too.
I got a non-working Aprilia scooter counter from a friend - Crs designation. EASY SR50.
The reason can be seen in the photo: punctured PJ72GEX diode, two PJ74GS1M diodes, and a cracked housing in the third one.



After removing them and LP2951, I connected the 5V power supply at the output of the LP regulator. Switching on looks like this:



Is the mileage displayed? And the message "Er" as in the picture. At this time, there is a sound from the "hand mechanism" and the display goes out.
The thing is that there is a short circuit at the output of the LP regulator, and when "turning on" the MCU system, the MC68HC908LJ12 CFUE designation heats up to about 70-80 degrees Celsius because at the VDD, VDDa power input, it is also almost a complete short circuit.

I checked the separating plugs on these pins 49.50-Vdd, Vdda, 51-Vss and found nothing. Unfortunately, I have no idea where else to look for a short circuit because only the MCU is actually heating up, apart from the gentle warming up of the 2x7 pin PH6AD -74AC00 system near the counter pointer.
Does such a counter look rather beaten, or after replacing these damaged diodes (as far as individual pieces are ordered), is it possible that it will work?

Update (fault search): After lifting the first two legs on the fourth side of the MCU, it turns out that Vdd..., other short circuits on the 5V line have disappeared.