Hi,
I've build my x0xb0x, checked the VCO and VCF, and checked all the polarities, and IC's. Power is fine, there are no shorts, and there is no trash. I looked over the board several times. The wire connectors are also fine.
But the problem:
-when i power up, all the lights go on, but there is no sound or interaction possible. When I power of and on again within a few second, a section of the led lights is off. After a few of these reboots, all leds are off.
When i try to connect with the CPU with USB/conbox, the CPU isn't there.
I bought a new CPU, with sokkOS 1.9.1 on it, so that should be fine (first CPU had no bootloader).
I checked the analog voltages, but havent checked the digital section, because I haven't got them(reference).
I spent a lot of time measuring and looking for errors, but didn't find the error.
My hope is running low. But I won't give up. This monster will work!
Does anyone recognize this problem?
sequencer won't work, need some help
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Please be positive and constructive with your questions and comments.
- phono
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Re: sequencer won't work, need some help
make sure you dont have the selection knob on backwards which may put you in bootloader mode instead of what you intended
-
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Re: sequencer won't work, need some help
well the knob doesn't go on backwards, and more so, the position of the knob, doesn't make ANY difference. all the leds are on, and there is no interaction or sound.phono wrote:make sure you dont have the selection knob on backwards which may put you in bootloader mode instead of what you intended
- mmm
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Re: sequencer won't work, need some help
The processor probably doesn't run.
The nice thing about the digital part is that it has so few components. For the processor to execute its program it needs the following things:
- supply voltage
- reset voltage
- clock
Check if all those are present at the processor
- supply voltage is on pin 40 (ground is pin 20)
- reset line is pin 9
- clock is on pins 18 and 19
My suspicions would run towards the resonator (read: the clock) because I've seen this problem before.
The nice thing about the digital part is that it has so few components. For the processor to execute its program it needs the following things:
- supply voltage
- reset voltage
- clock
Check if all those are present at the processor
- supply voltage is on pin 40 (ground is pin 20)
- reset line is pin 9
- clock is on pins 18 and 19
My suspicions would run towards the resonator (read: the clock) because I've seen this problem before.
-
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Re: sequencer won't work, need some help
Thanks MMM
I'll check the resonator. I've got a spare so that would be nice!
I'll check the resonator. I've got a spare so that would be nice!
-
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- Joined: Sun May 13, 2012 8:35 pm
Re: sequencer won't work, need some help
eh, how do you test a 16MHz resonator?
I've got a scope, should I see a sinus or block, between tthe to outer pins, or from pin to earth?
never tested one before...
I've got a scope, should I see a sinus or block, between tthe to outer pins, or from pin to earth?
never tested one before...
- altitude
- Posts: 995
- Joined: Wed May 11, 2005 5:17 pm
Re: sequencer won't work, need some help
what is your +5 rail reading? Check that first. I've seen a number of those Chinese boards with bad etching in the digital section
-
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Re: sequencer won't work, need some help
first thing I checked. their good.Altitude wrote:what is your +5 rail reading? Check that first. I've seen a number of those Chinese boards with bad etching in the digital section
Tomorrow I'll put in a new 16MHz crystal. The resonator had 3 pins, the crystal only 2, does that make any difference?
should I put in 2 22pF to ground?
- altitude
- Posts: 995
- Joined: Wed May 11, 2005 5:17 pm
Re: sequencer won't work, need some help
yeah, there is a difference.. you will need 2 caps with a regular crystal. Each leg of the crystal gets a cap to ground. Make sure you get a parallel cut one, not series cut and check the spec sheet for the right cap value. Use NP0/C0G grade caps. The resonator has its middle pin to ground and does not need caps (why it was used)
-
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Re: sequencer won't work, need some help
Parallel cut? Series cut? Whats that?Altitude wrote:yeah, there is a difference.. you will need 2 caps with a regular crystal. Each leg of the crystal gets a cap to ground. Make sure you get a parallel cut one, not series cut and check the spec sheet for the right cap value. Use NP0/C0G grade caps. The resonator has its middle pin to ground and does not need caps (why it was used)
-
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Re: sequencer won't work, need some help
The atmega162 says 12-22 pF with a crystal, so thats good.
Exciting! Maybe today its going to work!
Exciting! Maybe today its going to work!
-
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- Joined: Sun May 13, 2012 8:35 pm
Re: sequencer won't work, need some help
I found a really intersting link, it's off topic, but wanted to shareevostars wrote:The atmega162 says 12-22 pF with a crystal, so thats good.
Exciting! Maybe today its going to work!
http://www.BANNED.com/xoven.htm
A (electronic) oven te keep a XTAL stable!
How nice
-
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- Joined: Sun May 13, 2012 8:35 pm
Re: sequencer won't work, need some help
Ok, when i measure the 6 Mhz of the IO board, i see a sinus.
But at pin 18 and 19 of the 162 no signal.
Pin 18 is 0 volts
Pin 19 is 141 mV
Still no luck today. New crystal doesnt change anything.
But at pin 18 and 19 of the 162 no signal.
Pin 18 is 0 volts
Pin 19 is 141 mV
Still no luck today. New crystal doesnt change anything.
-
- Posts: 110
- Joined: Sun May 13, 2012 8:35 pm
Re: sequencer won't work, need some help
Ahrgggg
Why?
Why?
- mmm
- Posts: 517
- Joined: Tue Apr 24, 2012 1:51 am
Re: sequencer won't work, need some help
I take it you have checked pin 9 of the processor first?
If that looks ok you need to check if there is a short. Suspect would be pin 18 against ground; but check bopth pin 18 and 19 against ground and each other; and also check continuity between the pins and the resonator.
And don't worry too much.
If that looks ok you need to check if there is a short. Suspect would be pin 18 against ground; but check bopth pin 18 and 19 against ground and each other; and also check continuity between the pins and the resonator.
And don't worry too much.
Please be positive and constructive with your questions and comments.