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2015-10-23 by templarser@...
2015-10-23 by Daniel Forró
Dear all,
Just taken in an AZ1 with one broken key and 'power light on but no one home' - anyone have any experience with these keytars in a repair context?
LEE
2015-10-23 by Lee Borrell
Thanks for the offer Dan - but I have just got them from manualsib :-) What good they'll do I don't know!
From: "Daniel Forró danforcz@yahoo.com [CZsynth]" <CZsynth@yahoogroups.com>
To: CZsynth@yahoogroups.com
Sent: Friday, 23 October 2015, 13:17
Subject: Re: [CZsynth] AZ1 repair
No experience, but I have Owner's manual and Service manual, if you need it I can send it to your address.
Daniel Forro
On Oct 23, 2015, at 9:11 PM, templarser@... [CZsynth] wrote:
Dear all,
Just taken in an AZ1 with one broken key and 'power light on but no one home' - anyone have any experience with these keytars in a repair context?
LEE2015-10-23 by Daniel Forró
Dear all,
Just taken in an AZ1 with one broken key and 'power light on but no one home' - anyone have any experience with these keytars in a repair context?
LEE
2015-10-23 by Lee Borrell
Diag is not going to get too far without anything lighting up - it is as though no power is coming from the PSU PCB - yet the power light is on. It is possible for everything but the power LED to get power. I have asked the seller what the history is - that may shed some light - otherwise I'll have to go in and see where the power is and isn't.
From: "Daniel Forró danforcz@... [CZsynth]" <CZsynth@yahoogroups.com>
To: CZsynth@yahoogroups.com
Sent: Friday, 23 October 2015, 13:24
Subject: Re: [CZsynth] AZ1 repair
There's also diagnostics mode described on the page 27 of Service manual.
Daniel Forro
On Oct 23, 2015, at 9:11 PM, templarser@... [CZsynth] wrote:
Dear all,
Just taken in an AZ1 with one broken key and 'power light on but no one home' - anyone have any experience with these keytars in a repair context?
LEE2015-10-23 by Daniel Forró
Diag is not going to get too far without anything lighting up - it is as though no power is coming from the PSU PCB - yet the power light is on. It is possible for everything but the power LED to get power.
I have asked the seller what the history is - that may shed some light - otherwise I'll have to go in and see where the power is and isn't.
2015-10-23 by Lee Borrell
Thanks Dan - looks like I am going to be poring over the PDF for a while.
From: "Daniel Forró danforcz@... [CZsynth]" <CZsynth@yahoogroups.com>
To: CZsynth@yahoogroups.com
Sent: Friday, 23 October 2015, 13:46
Subject: Re: [CZsynth] AZ1 repair
Then I would start to check all circuits delivering the power - there's one for digital circuits, another one for analog circuits, third one for LEDs. Maybe something is wrong there.
Service manual describes some voltage settings on page 28, and troubleshooting starts on page 30.
Daniel Forro
On Oct 23, 2015, at 9:39 PM, Lee Borrell templarser@... [CZsynth] wrote:
Diag is not going to get too far without anything lighting up - it is as though no power is coming from the PSU PCB - yet the power light is on. It is possible for everything but the power LED to get power.
I have asked the seller what the history is - that may shed some light - otherwise I'll have to go in and see where the power is and isn't.2015-10-25 by Lee Borrell
This is what I have found out: The processor appears to be operating. The digital and analogue supplies appear to work,since moving a potentiometer sends a voltage to the analogue inputs of the processor,this then sends out transmissions on the tx pin (17) and it even makes it to the MIDI out although seemingly at not a sufficient level to generate MIDI,it does flash the LED on my MIDI/USB cable - but not the correct colour. I am wondering if the output stage tranny is fouled. The whole front facia does not light up,I have not located the LED power,but there is a 'backbone' ribbon cable of the type that tends to break when bent,which I am about to beep out to see if it is intact. It seems the machine is operational ,but just not indicating what it is doing,or producing MIDI strong enough to be noted AS a midi signal.Indeed I read on a forum that someone else had an AZ1 with power light on and producing MIDI but not showing any LED action. It is suggestive of the LED power or ribbon cable being at fault. At least there is hope if the processor is not dodgy and doing what it should.
From: "Daniel Forró danforcz@... [CZsynth]" <CZsynth@yahoogroups.com>
To: CZsynth@yahoogroups.com
Sent: Friday, 23 October 2015, 13:46
Subject: Re: [CZsynth] AZ1 repair
Then I would start to check all circuits delivering the power - there's one for digital circuits, another one for analog circuits, third one for LEDs. Maybe something is wrong there.
Service manual describes some voltage settings on page 28, and troubleshooting starts on page 30.
Daniel Forro
On Oct 23, 2015, at 9:39 PM, Lee Borrell templarser@... [CZsynth] wrote:
Diag is not going to get too far without anything lighting up - it is as though no power is coming from the PSU PCB - yet the power light is on. It is possible for everything but the power LED to get power.
I have asked the seller what the history is - that may shed some light - otherwise I'll have to go in and see where the power is and isn't.2015-10-25 by Gordonjcp
On Sun, Oct 25, 2015 at 08:59:46PM +0000, Lee Borrell templarser@... [CZsynth] wrote: > It seems the machine is operational ,but just not indicating what it is doing,or producing MIDI strong enough to be noted AS a midi signal.Indeed I read on a forum that someone else had an AZ1 with power light on and producing MIDI but not showing any LED action. It is suggestive of the LED power or ribbon cable being at fault. Have you checked the power supply, starting at the power socket and working your way in? -- Gordonjcp MM0YEQ
2015-10-25 by Lee Borrell
2015-10-25 by Gordonjcp
On Sun, Oct 25, 2015 at 10:46:54PM +0000, Lee Borrell templarser@... [CZsynth] wrote: > Yes - The main CPU is operating and producing signals as it should on the oscilloscope with the PSU at the power pin.Everything works - including the backbone connector between the circuit boards. There is just no LED response and a weak output from the MIDI socket. > The processor seems to be producing MIDI ok and producing the LED signals from the addressing pins. > To me it looks like the MIDI output stage tranny is not doing its job - and something is either wrong with the LED power source (which is separate from the analogue and digital sources) or the whole LED driver stage has failed (which does not seem likely). I am pretty certain there is a working AZ in there waiting to come back to life. > Right, but what's the actual supply to the MIDI driver tranny and LED drivers looking like? -- Gordonjcp MM0YEQ
2015-10-27 by dlonrattam@...
2015-10-27 by Lee
I have not located that. I believe it is around T7/T8. T7 is a power tranny. It seems much more likely that there is a fault in that source,which is common to all Leds save the power light, than the whole swathe of trannies serving the Leds having failed. Sent from my iPhone
On 25 Oct 2015, at 23:32, "Gordonjcp gordon@... [CZsynth]" <CZsynth@yahoogroups.com> wrote: > On Sun, Oct 25, 2015 at 10:46:54PM +0000, Lee Borrell templarser@yahoo.co.uk [CZsynth] wrote: > > Yes - The main CPU is operating and producing signals as it should on the oscilloscope with the PSU at the power pin.Everything works - including the backbone connector between the circuit boards. There is just no LED response and a weak output from the MIDI socket. > > The processor seems to be producing MIDI ok and producing the LED signals from the addressing pins. > > To me it looks like the MIDI output stage tranny is not doing its job - and something is either wrong with the LED power source (which is separate from the analogue and digital sources) or the whole LED driver stage has failed (which does not seem likely). I am pretty certain there is a working AZ in there waiting to come back to life. > > > > Right, but what's the actual supply to the MIDI driver tranny and LED drivers looking like? > > -- > Gordonjcp MM0YEQ > >
2015-10-27 by Lee
I am using a power bank 450ma supply which powers all other casios ok. I did try batteries, but I think the ones I tried were not fresh. There is no problem with the analogue supply to actuators or seemingly the digital one to the processor and ancillary Mos chips. It's just the led display and midi out. I have tracked the midi signal from the processor to a hex inverter, the signal is ok passing the inverter and then leaves the board to meet the output board via a brown wire. The same signal is present at the other end of the cable where it then passes a tranny on the output board, the only other active component before it meets the socket. When connected to a midi usb connector the led on the lead seems 'underwhelmed' by the signal as if it is not strong enough. One can see the data being generated, but nothing happens at the receive end. A forum posting I read attested to the same problem on another az,so perhaps what has happened here is some achilles heel. Sent from my iPhone
On 27 Oct 2015, at 04:53, "dlonrattam@... [CZsynth]" <CZsynth@yahoogroups.com> wrote: > Casio hardware is notorious for being sensitive to "under-spec" power supplies. > > > The CZ-1, for example, when plugged into a power supply that doesn't fully deliver the required current, can "seem" to be powered on, with LEDs lit up and everything, but may not respond properly or make strange or no sounds. > > What are the power requirements of the AZ-1 and what are the specifications of the power supply you are using? > > Even if these two things match, are you sure the power supply (if old) is still operating to spec? Can you try another power supply? > > Also, does the AZ-1 power up and operate properly when powered by fresh batteries? >
2015-10-27 by Gordonjcp
On Tue, Oct 27, 2015 at 10:45:18AM +0000, Lee templarser@... [CZsynth] wrote: > I am using a power bank 450ma supply which powers all other casios ok. That doesn't sound like anywhere near enough current. Try something like a 1A supply. -- Gordonjcp MM0YEQ
2015-10-27 by Lee
Az is rated at 1.3 w. the casio dg I am working on is rated 4.3w and works off the power bank easily. The dg also uses big fat round batteries, whereas the az uses thin penlight batteries. If there was a current problem then the power pack ought to fail the dg10 too, which it doesn't. W=IV I=W/V Current for dg = 477ma For az = 144ma If anything the dg needs a better psu. The az should be ok? Sent from my iPhone
On 27 Oct 2015, at 11:13, "Gordonjcp gordon@... [CZsynth]" <CZsynth@yahoogroups.com> wrote: > On Tue, Oct 27, 2015 at 10:45:18AM +0000, Lee templarser@... [CZsynth] wrote: > > I am using a power bank 450ma supply which powers all other casios ok. > > That doesn't sound like anywhere near enough current. Try something like a 1A supply. > > -- > Gordonjcp MM0YEQ > >
2015-12-06 by Lee Borrell
Had 50% success replacing transistors - I managed to reclaim the MIDI output - which I think was due to replacing the tranny on the socket board driving the output. Someone has obviously been there ahead of me as the MIDI socket has been rewired to the tracks presumably thinking that the socket had come away from the board. I had replaced T7/T8 also which is the LED power but this does not seem to have helped the display. I am fairly certain now that the CPU is operational as all functions are working - just no display. I am finding it hard to believe all the transistors (T19....) in the display matrix are faulty,but the CPU seems to be generating output signals,so either they are - or I didn't do the power ones correctly. I am fairly certain I did however - so are these other trannies at the display end the ONLY possibility of failure? Any ideas? LEE
From: "Daniel Forró danforcz@... [CZsynth]" <CZsynth@yahoogroups.com>
To: CZsynth@yahoogroups.com
Sent: Friday, 23 October 2015, 13:46
Subject: Re: [CZsynth] AZ1 repair
Then I would start to check all circuits delivering the power - there's one for digital circuits, another one for analog circuits, third one for LEDs. Maybe something is wrong there.
Service manual describes some voltage settings on page 28, and troubleshooting starts on page 30.
Daniel Forro
On Oct 23, 2015, at 9:39 PM, Lee Borrell templarser@yahoo.co.uk [CZsynth] wrote:
Diag is not going to get too far without anything lighting up - it is as though no power is coming from the PSU PCB - yet the power light is on. It is possible for everything but the power LED to get power.
I have asked the seller what the history is - that may shed some light - otherwise I'll have to go in and see where the power is and isn't.2015-12-23 by Daniel Forró
Hi everybody, enjoy some Christmas music on my new YouTube channel if you celebrate :-) Daniel Forró - Forrotronics
2016-04-15 by Lee Borrell
Further update -after changing all the display transistors - I finally tracked the problem to VR1 - which adjusts the voltage to the LED supply circuit - being set too low. Once altered - the display returned. Everything now works,apart from the MIDI channel set button - which is a bit strange,since the button itself seems to be okay,whilst this is a minor fault - it is a tad irritating. No doubt I will track it down in time. I am writing a report on the findings at AZ for reference. | | | | | | | | | | | AZFrom my own experience the AZ1 seems to suffer from a couple of possible faults. The one's my own suffered from was no display and no MIDI output. The ... | | | | View on templarseries.atspac... | Preview by Yahoo | | | | |
From: "Lee templarser@... [CZsynth]" <CZsynth@yahoogroups.com>
To: "CZsynth@yahoogroups.com" <CZsynth@yahoogroups.com>
Sent: Tuesday, 27 October 2015, 11:39
Subject: Re: [CZsynth] Re: AZ1 repair
Az is rated at 1.3 w. the casio dg I am working on is rated 4.3w and works off the power bank easily. The dg also uses big fat round batteries, whereas the az uses thin penlight batteries.
If there was a current problem then the power pack ought to fail the dg10 too, which it doesn't.
W=IV
I=W/V
Current for dg = 477maFor az = 144ma
If anything the dg needs a better psu. The az should be ok?
Sent from my iPhone
On 27 Oct 2015, at 11:13, "Gordonjcp gordon@gjcp.net [CZsynth]" <CZsynth@yahoogroups.com> wrote:
On Tue, Oct 27, 2015 at 10:45:18AM +0000, Lee templarser@... [CZsynth] wrote:
> I am using a power bank 450ma supply which powers all other casios ok.
That doesn't sound like anywhere near enough current. Try something like a 1A supply.
--
Gordonjcp MM0YEQ2016-04-15 by Lee Borrell
Just noticed that the definable slider only runs from 57-99 instead of 0-99 - another slight bug.
From: "Lee Borrell templarser@... [CZsynth]" <CZsynth@yahoogroups.com>
To: "CZsynth@yahoogroups.com" <CZsynth@yahoogroups.com>
Sent: Friday, 15 April 2016, 20:19
Subject: Re: [CZsynth] Re: AZ1 repair
Further update -after changing all the display transistors - I finally tracked the problem to VR1 - which adjusts the voltage to the LED supply circuit - being set too low. Once altered - the display returned.
Everything now works,apart from the MIDI channel set button - which is a bit strange,since the button itself seems to be okay,whilst this is a minor fault - it is a tad irritating. No doubt I will track it down in time.
I am writing a report on the findings at AZ for reference.
| |
| | | | | | | |
| AZFrom my own experience the AZ1 seems to suffer from a couple of possible faults. The one's my own suffered from was no display and no MIDI output. The ... |
| |
| View on templarseries.atspac... | Preview by Yahoo |
| |
| |
From: "Lee templarser@... [CZsynth]" <CZsynth@yahoogroups.com>
To: "CZsynth@yahoogroups.com" <CZsynth@yahoogroups.com>
Sent: Tuesday, 27 October 2015, 11:39
Subject: Re: [CZsynth] Re: AZ1 repair
Az is rated at 1.3 w. the casio dg I am working on is rated 4.3w and works off the power bank easily. The dg also uses big fat round batteries, whereas the az uses thin penlight batteries.
If there was a current problem then the power pack ought to fail the dg10 too, which it doesn't.
W=IV
I=W/V
Current for dg = 477maFor az = 144ma
If anything the dg needs a better psu. The az should be ok?
Sent from my iPhone
On 27 Oct 2015, at 11:13, "Gordonjcp gordon@... [CZsynth]" <CZsynth@yahoogroups.com> wrote:
On Tue, Oct 27, 2015 at 10:45:18AM +0000, Lee templarser@yahoo.co.uk [CZsynth] wrote:
> I am using a power bank 450ma supply which powers all other casios ok.
That doesn't sound like anywhere near enough current. Try something like a 1A supply.
--
Gordonjcp MM0YEQ2016-04-15 by Lee Borrell
It looks like all the VR controls are not minimizing to zero.
From: "Lee Borrell templarser@... [CZsynth]" <CZsynth@yahoogroups.com>
To: "CZsynth@yahoogroups.com" <CZsynth@yahoogroups.com>
Sent: Friday, 15 April 2016, 20:29
Subject: Re: [CZsynth] Re: AZ1 repair
Just noticed that the definable slider only runs from 57-99 instead of 0-99 - another slight bug.
From: "Lee Borrell templarser@... [CZsynth]" <CZsynth@yahoogroups.com>
To: "CZsynth@yahoogroups.com" <CZsynth@yahoogroups.com>
Sent: Friday, 15 April 2016, 20:19
Subject: Re: [CZsynth] Re: AZ1 repair
Further update -after changing all the display transistors - I finally tracked the problem to VR1 - which adjusts the voltage to the LED supply circuit - being set too low. Once altered - the display returned.
Everything now works,apart from the MIDI channel set button - which is a bit strange,since the button itself seems to be okay,whilst this is a minor fault - it is a tad irritating. No doubt I will track it down in time.
I am writing a report on the findings at AZ for reference.
| |
| | | | | | | |
| AZFrom my own experience the AZ1 seems to suffer from a couple of possible faults. The one's my own suffered from was no display and no MIDI output. The ... |
| |
| View on templarseries.atspac... | Preview by Yahoo |
| |
| |
From: "Lee templarser@... [CZsynth]" <CZsynth@yahoogroups.com>
To: "CZsynth@yahoogroups.com" <CZsynth@yahoogroups.com>
Sent: Tuesday, 27 October 2015, 11:39
Subject: Re: [CZsynth] Re: AZ1 repair
Az is rated at 1.3 w. the casio dg I am working on is rated 4.3w and works off the power bank easily. The dg also uses big fat round batteries, whereas the az uses thin penlight batteries.
If there was a current problem then the power pack ought to fail the dg10 too, which it doesn't.
W=IV
I=W/V
Current for dg = 477maFor az = 144ma
If anything the dg needs a better psu. The az should be ok?
Sent from my iPhone
On 27 Oct 2015, at 11:13, "Gordonjcp gordon@... [CZsynth]" <CZsynth@yahoogroups.com> wrote:
On Tue, Oct 27, 2015 at 10:45:18AM +0000, Lee templarser@....uk [CZsynth] wrote:
> I am using a power bank 450ma supply which powers all other casios ok.
That doesn't sound like anywhere near enough current. Try something like a 1A supply.
--
Gordonjcp MM0YEQ2016-04-15 by Lee
The midi channel set is dysfunctional because the offset of the pitch bender is incorrect. Looks like someone had a good old mess with the variable resistors. The button becomes active as per the manual when the pbend is set to a value mimicking centre. So it seems all but the midi output problem have been caused by mal-adjusted presets. Sent from my iPhone
On 15 Apr 2016, at 20:49, "Lee Borrell templarser@... [CZsynth]" <CZsynth@yahoogroups.com> wrote: > It looks like all the VR controls are not minimizing to zero. > > > From: "Lee Borrell templarser@... [CZsynth]" <CZsynth@yahoogroups.com> > To: "CZsynth@yahoogroups.com" <CZsynth@yahoogroups.com> > Sent: Friday, 15 April 2016, 20:29 > Subject: Re: [CZsynth] Re: AZ1 repair > > > Just noticed that the definable slider only runs from 57-99 instead of 0-99 - another slight bug. > > > From: "Lee Borrell templarser@... [CZsynth]" <CZsynth@yahoogroups.com> > To: "CZsynth@yahoogroups.com" <CZsynth@yahoogroups.com> > Sent: Friday, 15 April 2016, 20:19 > Subject: Re: [CZsynth] Re: AZ1 repair > > > Further update -after changing all the display transistors - I finally tracked the problem to VR1 - which adjusts the voltage to the LED supply circuit - being set too low. Once altered - the display returned. > > Everything now works,apart from the MIDI channel set button - which is a bit strange,since the button itself seems to be okay,whilst this is a minor fault - it is a tad irritating. No doubt I will track it down in time. > > I am writing a report on the findings at AZ for reference. > > > > > > > > > AZ > From my own experience the AZ1 seems to suffer from a couple of possible faults. The one's my own suffered from was no display and no MIDI output. The ... > View on templarseries.atspac... > Preview by Yahoo > > > > From: "Lee templarser@... [CZsynth]" <CZsynth@yahoogroups.com> > To: "CZsynth@yahoogroups.com" <CZsynth@yahoogroups.com> > Sent: Tuesday, 27 October 2015, 11:39 > Subject: Re: [CZsynth] Re: AZ1 repair > > > Az is rated at 1.3 w. the casio dg I am working on is rated 4.3w and works off the power bank easily. The dg also uses big fat round batteries, whereas the az uses thin penlight batteries. > > If there was a current problem then the power pack ought to fail the dg10 too, which it doesn't. > > W=IV > > I=W/V > > Current for dg = 477ma > For az = 144ma > > If anything the dg needs a better psu. The az should be ok? > > > > Sent from my iPhone > > On 27 Oct 2015, at 11:13, "Gordonjcp gordon@... [CZsynth]" <CZsynth@yahoogroups.com> wrote: > >> >> On Tue, Oct 27, 2015 at 10:45:18AM +0000, Lee templarser@... [CZsynth] wrote: >> > I am using a power bank 450ma supply which powers all other casios ok. >> >> That doesn't sound like anywhere near enough current. Try something like a 1A supply. >> >> -- >> Gordonjcp MM0YEQ > > > > > > > >
2016-04-18 by Gordonjcp
On Sat, Apr 16, 2016 at 12:06:36AM +0100, Lee templarser@... [CZsynth] wrote: > The midi channel set is dysfunctional because the offset of the pitch bender is incorrect. > Looks like someone had a good old mess with the variable resistors. > The button becomes active as per the manual when the pbend is set to a value mimicking centre. > > So it seems all but the midi output problem have been caused by mal-adjusted presets. Back in the day, I had an evening job after school in a TV repair shop, and back then TVs and video recorders had a ridiculous amount of presets that controlled nearly every aspect of their operation. You'd be amazed - or maybe you wouldn't - how many people would bring their ailing VCR in and say "Oh the picture went all fuzzy so I opened it up and a lot of the little screw things were loose so I tightened them up but it hasn't helped - it's not going to be *very* expensive is it?" Well now, I hate to have to break it to you like this, but... -- Gordonjcp MM0YEQ
2016-04-18 by Lee
Fortunately there's only 3 in this unit. Vr3 is the aftertouch adjustment. Not quite sure what Vr2 is for, but Vr1 was the reason there was no display and it seems affects the voltage supplied to the cc controllers. None of them seem to affect the minimum value of the cc controls. I did find however that the adc voltage reference alters from 5v to 3.78 v when the power switch is on. Apparently all the power is not switched off when the power switch is in the off position. I am thence uncertain as to whether this might be behind the inability to set the cc controls to minimum values. I have however found a workaround in passing the data through midi-ox and remapping the values. A tad awkward since the az cannot be used stand-alone, which is a bit of a drawback for a keytar! Sent from my iPhone
On 18 Apr 2016, at 09:55, "Gordonjcp gordon@... [CZsynth]" <CZsynth@yahoogroups.com> wrote: > On Sat, Apr 16, 2016 at 12:06:36AM +0100, Lee templarser@... [CZsynth] wrote: > > The midi channel set is dysfunctional because the offset of the pitch bender is incorrect. > > Looks like someone had a good old mess with the variable resistors. > > The button becomes active as per the manual when the pbend is set to a value mimicking centre. > > > > So it seems all but the midi output problem have been caused by mal-adjusted presets. > > Back in the day, I had an evening job after school in a TV repair shop, and back then TVs and video recorders had a ridiculous amount of presets that controlled nearly every aspect of their operation. > > You'd be amazed - or maybe you wouldn't - how many people would bring their ailing VCR in and say "Oh the picture went all fuzzy so I opened it up and a lot of the little screw things were loose so I tightened them up but it hasn't helped - it's not going to be *very* expensive is it?" > > Well now, I hate to have to break it to you like this, but... > > -- > Gordonjcp MM0YEQ >