Author Topic: Spa Computer Help  (Read 6625 times)

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Offline wasyoungonce

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Re: Spa Computer Help
« Reply #25 on: June 29, 2017, 11:22:28 pm »
The ULN2803 is easy to remove..cut the pins...de-solder the left over.  Once removed...chuck it an get another...easy cheap as.   But this is why i said just cut one leg between this IC and the microcontroller, then take a measurement from the micro...... so you can solder it back together (or replace the IC).

Or you can cut the trace between then and solder a bridge later.
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Offline vortex_690

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Re: Spa Computer Help
« Reply #26 on: June 29, 2017, 11:43:22 pm »
The uln2803 where would u buy another and does require some firmware or something loaded into it

Would jaycar have it
 

Offline wasyoungonce

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Re: Spa Computer Help
« Reply #27 on: June 30, 2017, 12:12:58 am »
UlN2803 is a Darlington pair transistor amplifier....no firmware at all.  Fleabay,

RS...free post, pk 5 $1.88 ea

Element14 post is ~ $7 IC is $1.62 in ea

WES, post is ~ $7 IC is $3.41 ea

Xon post unknown, $1.4 or IC ea

Fleabay from $3 and up Qty 4 for $4.90 in Australia

There might be cheaper ...I don't think Jaycar have them.

edit:
Altronics have them....$5.20...which is costly!
Altronics



« Last Edit: June 30, 2017, 12:15:39 am by wasyoungonce »
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Offline Armadillo

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Re: Spa Computer Help
« Reply #28 on: June 30, 2017, 12:15:28 am »
Bumped it to 4.96 no change

Your clock is not oscillating. Nothing will work. ! Now it is important to get hold of a digital logic probe to confirm if Pin 10 is oscillating or not but the voltage reading show it is only at high. If your multimeter can read frequency up to 4 Mhz, then read Pin 10. Otherwise get the logic probe.

There are left with 2 possibility. One is critical end of Game and One is survival. So firstly confirm the above then decide if to buy the blue color 4.006325 Ceramic Resonator.

There is nothing else you should consider to buy else until you solve the above. [The ULN2803 is just a Darlington Transistors Array, there is no firmware required BUT.....]

You had better trace Pin 1 to the associated component and check/identify those because wire to high inhabit the proper reset timing and sequence for the microcontroller.


« Last Edit: June 30, 2017, 12:23:18 am by Armadillo »
 

Offline vortex_690

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Re: Spa Computer Help
« Reply #29 on: June 30, 2017, 12:45:17 am »
 

Offline wasyoungonce

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Re: Spa Computer Help
« Reply #30 on: June 30, 2017, 12:53:16 am »
https://www.jaycar.com.au/uln2003-darlington-transistor-array-ic/p/ZK8855  would this one work

No it has 16 pins the ULN2803 has 18.  best if you try to read the data sheets on these items.  They have all the information you need.
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Offline vortex_690

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Re: Spa Computer Help
« Reply #31 on: June 30, 2017, 12:57:49 am »
This is the underside

Is this what u need

I added another with pin 1 labeled  i think it connects to the little yellow bulb which is c5 is that a ceramic ......??
« Last Edit: June 30, 2017, 01:10:42 am by vortex_690 »
 

Offline Armadillo

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Re: Spa Computer Help
« Reply #32 on: June 30, 2017, 01:21:52 am »
This is the underside

Is this what u need

I added another with pin 1 labeled  i think it connects to the little yellow bulb which is c5 is that a ceramic ......??

OK it just connect to 1 capacitor and not other reset circuit. I don't think is the problem. [it just relied on Power on reset and there is no hardware reset ability so that means its unlikely to go into sleep mode, forget this pin for now]. [Edit: Remove any jumper wire, if you had installed one]

Solve the clock problem first.  It's like an engine, engine not rotating, nothing moves. Kick it [agitate it manually] maybe 1 revolution. Logic Probe it and better hope its the blue ceramic resonator. Otherwise End Of Game.
« Last Edit: June 30, 2017, 01:37:17 am by Armadillo »
 

Offline Armadillo

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Re: Spa Computer Help
« Reply #33 on: June 30, 2017, 02:11:07 am »
Anyway, the blue ceramic resonator is just a few cents. If you do not have the logic probe still and not contemplating to have one, then you can buy the ceramic resonator and changed it and hope for the best because its either the microcontroller or the resonator. But as far as I personally know, ceramic likes to crack. Most people here knows about the MLCC failure rates. Its about the same. I would say its 70 faulty Resonator and 30 Atmel [as far as I know, atmel is pretty robust as much as I have abused it]. But I would still advice you to probe Pin 10, ascertain before buy Policy, because I am not the change, change change everything repair-type. If you can probe, press up and down buttons together momentarily to simulate wake up call, before probe just in case sleep mode entered. Unlikely but we always ascertain things from crazy programmer.

Even if is the faulty microcontroller, not  exactly end of game. You can get new game in the microcontroller/fpga section of this forum. The atmel microcontroller AT90S4433 firmware is easy to write if you know programming, you can even add new endless features. You can try to ask someone [maybe a student] to write the firmware for you at a token and own the firmware forever. Maybe at a $100, you can get the firmware and 5 programmed AT90S4433 as spared. :-) . [hopefully]

« Last Edit: June 30, 2017, 02:16:38 am by Armadillo »
 

Offline vortex_690

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Re: Spa Computer Help
« Reply #34 on: June 30, 2017, 02:47:01 am »
I have just been running around trying to get the probe no one has  it the only place is ebay so looks like i have to order from them which is terrible cause now i will have to wait
Unless anyone else knows somewhere in sydney
 

Offline Armadillo

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Re: Spa Computer Help
« Reply #35 on: June 30, 2017, 03:07:21 am »
I have just been running around trying to get the probe no one has  it the only place is ebay so looks like i have to order from them which is terrible cause now i will have to wait
Unless anyone else knows somewhere in sydney

Do order the ceramic resonator same time, just few cents. But remember its 3 pins.,  not 2 pins.
 

Offline vortex_690

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Re: Spa Computer Help
« Reply #36 on: June 30, 2017, 03:13:59 am »
The ceramic resonator does it have to be exactly same one

I found them on ebay but lots off different mhz
 

Offline Armadillo

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Re: Spa Computer Help
« Reply #37 on: June 30, 2017, 04:51:26 am »
The ceramic resonator does it have to be exactly same one

I found them on ebay but lots off different mhz

4.000 Mhz, 3 pins
 

Offline vortex_690

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Re: Spa Computer Help
« Reply #38 on: June 30, 2017, 04:53:07 am »
 

Offline Armadillo

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Re: Spa Computer Help
« Reply #39 on: June 30, 2017, 05:00:01 am »
 


Offline Armadillo

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Re: Spa Computer Help
« Reply #41 on: June 30, 2017, 06:15:13 am »
Any of the murata.
Have you read the delivery minimum charges?
 

Offline wasyoungonce

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Re: Spa Computer Help
« Reply #42 on: June 30, 2017, 06:17:20 am »
Yep has to be same frequency 4.0Mhz, 3 pin ceramic resonator.     

Its important to use the same parts, yes sometimes you can substitute but not for this, its too much stuffing around.  That said ceramic resonators are slightly less accurate than crystals and indeed usually can be replaced by crystals (but you need extra trimmer caps etc), but for this purpose...just get another resonator with the same freq (3 pin).

edit:
ahh beaten by Armadillo   Annnd sorry forgot...measure the old one to ensure you buy the correct size.
« Last Edit: June 30, 2017, 06:19:26 am by wasyoungonce »
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Offline vortex_690

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Re: Spa Computer Help
« Reply #43 on: June 30, 2017, 06:24:26 am »
Ok guys thanks for all your patience and help I really appreciate it.

I guess we will just have to wait now for the items to arrive

Cheers Chris
 

Offline noidea

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Re: Spa Computer Help
« Reply #44 on: June 30, 2017, 04:07:44 pm »
I have just been running around trying to get the probe no one has  it the only place is ebay so looks like i have to order from them which is terrible cause now i will have to wait
Unless anyone else knows somewhere in sydney

Try Altronics they used to sell premade ones but now it looks like just kits, anyway it's something to practice your soldering skills on  :)
http://www.altronics.com.au/search/all/?sr=logic%2Bprobe
 

Offline drussell

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Re: Spa Computer Help
« Reply #45 on: June 30, 2017, 09:18:49 pm »
I have just been running around trying to get the probe no one has  it the only place is ebay so looks like i have to order from them which is terrible cause now i will have to wait

Wow, that is horrible....  used to be able to walk into any Radio Shack and pick one up for $14.95....  I'm sure I still have at least a couple of them around here somewhere from my pre-teen electronics days...  :)  I know I had at least two of them of my own, "back in the day" to watch multiple pins at the same time, though all my electronics friends had at least one each also so we often had three or four or more of them on the bench at any given time when we were working on projects as kids...  :)

I think my mom still has no idea what the heck we were doing down there but this was 20-30 years ago...  LOL
 

Offline wasyoungonce

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Re: Spa Computer Help
« Reply #46 on: June 30, 2017, 11:54:38 pm »
..........Wow, that is horrible....  used to be able to walk into any Radio Shack and pick one up for $14.95....

Arsetralia...the electronics backwater of the world where everything is either more expensive or unobtainable. 
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Offline james_s

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Re: Spa Computer Help
« Reply #47 on: July 01, 2017, 12:06:45 am »
Well it's effectively an island out in the middle of nowhere so it's not too surprising that stuff is expensive and has to be imported. The situation is not what it used to be anywhere though, Radio Shack is pretty much gone out here too. Logic probes can be bought online easily enough but I don't know if there's anywhere you can just walk into a store and buy something like that anymore.
 

Online DaJMasta

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Re: Spa Computer Help
« Reply #48 on: July 01, 2017, 12:37:15 am »
Logic probes have become a lot less prominent... not nearly as many hobbyists are trying to do logic work and scopes and logic analyzers have come way down in price... it's not surprising to me that they wouldn't have a logic probe in stock.  Not like they're complicated devices, though, if you had a breadboard and some parts you could certainly build one up.  Actually, it looks like it takes a pair of transistors or a quad nand/nor (or a couple other things, depending on the circuit), then a pair of LEDs and some passives.  If you're that hard pressed for a logic probe, it's easy to build and there's really no need for super accuracy or high speed design or what have you - it operates in a very coarse adjustment window.

Though I'll be honest, my first instinct isn't to check the clock anyways.
 

Offline Armadillo

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Re: Spa Computer Help
« Reply #49 on: July 01, 2017, 01:58:11 am »
You know, the problem is, we can have all the top range instruments, oscilloscope, spectrum analyser, logic analyser, signal analyser etc.... but when it comes to repair works, to answer the question, "Are you oscillating?", nothing beats the simple digital logic probe. No need to wait for the instrument to start-up, and the noisy fan whirling noises. Fast, simple and good and no nonsense. Will you turn on those instruments? Many times, I would not.

Also, I am of the opinion that it is not the simple electronic inside and then DIY kid sets.... I would advise beginners to avoid that... The important is the ergonomics of the casing or housing on the hand. It must come with a casing or housing. [Edit: The money is on the casing or housing]

Cursory browse on ebay will review that those slim styled ergonomically designed probes are of those branded brand types and normally higher in price tag. Before you buy though, it would be an added bonus if it will also work with 3.3v power supply level, preferably.

I would change the cheap crocodile style power clips which are prone to short out adjacent pins to those claw or grippers type, so beginners beware of locating appropriate hook up locations.

Will you need to have one?, Yes, in my opinion.


« Last Edit: July 01, 2017, 06:21:30 am by Armadillo »
 


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