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I am working with Roland Percussion Sound Modul TD-10 repair and have got some problem . Can you help me with some advice ?
This is the problem's description :
Unit: Roland Percussion Sound Modul
Model: TD-10
Main defect : Noise is going at "Phones" and "Master" outputs in any mode , except test mode . Instaed of the music in DEMO mode , we can hear the noise only , so far from real music .
Results of the internal tests : All tests seems good and report "OK" , except the following ones :
- Test 3 Expansion Board
Wave Exp. Test
Senso R/W NG
ERR ERR
(possible reason : no wave expansion card prerents at a slot )
- Test 4 ESP
ESP ERROR
PR IR DR GM SO
XP - - - NG -
ESP1 OK OK OK OK -
ESP2 OK OK OK OK -
ESP3 OK OK - OK -
- Test 7 Switch and LED
There is not [PREVIEW] button's velocity measuring done ! The reaction on this button pressing presents , but the velocity value lefts 12 and has no changes , so the test stops on this point and it is s impossible to finish it .
- Test 10 A/D
There is no reaction to FADER potenciometer's moving .
Additional remarks :
- after any key pressed , the LED "Trigger" begins to light randomly , but sinchronicaly with the noise .
- the noise is generated by DAC chip IC55 , and there is silence on the output of DAC IC51 .
- there is a strange meandr signal presents on a diagram of XRD signal
- signals CD3, CD10, CD13 are very strange and have have much differences from other CDx lines .
What I have made :
- swaped DAC IC51 with DAC IC55 - with no result , so possible the noise is generated by XP_3 and go thru ESP_2 chips to the DAC IC55 .
- replace IC27 XP_3 - with no result .
- checked signals on CPU IC28 , all signals seems normal , except XRD, CD3,CD10,CD3 .
- in working mode , cuted XRESET line from IC32 ECXITON and connected it to the ground - the noise left the same .
Possible reasons :
- CPU has some trouble in interrupts processing
- EXCITON doesn't let the MCU to process interrupts correctly .
What can you advise me to check more ?
I would be very thankful to you for any advices and possible collaboration .
Please replay to [email protected] .
Thank you .
I am working with Roland Percussion Sound Modul TD-10 repair and have got some problem . Can you help me with some advice ?
This is the problem's description :
Unit: Roland Percussion Sound Modul
Model: TD-10
Main defect : Noise is going at "Phones" and "Master" outputs in any mode , except test mode . Instaed of the music in DEMO mode , we can hear the noise only , so far from real music .
Results of the internal tests : All tests seems good and report "OK" , except the following ones :
- Test 3 Expansion Board
Wave Exp. Test
Senso R/W NG
ERR ERR
(possible reason : no wave expansion card prerents at a slot )
- Test 4 ESP
ESP ERROR
PR IR DR GM SO
XP - - - NG -
ESP1 OK OK OK OK -
ESP2 OK OK OK OK -
ESP3 OK OK - OK -
- Test 7 Switch and LED
There is not [PREVIEW] button's velocity measuring done ! The reaction on this button pressing presents , but the velocity value lefts 12 and has no changes , so the test stops on this point and it is s impossible to finish it .
- Test 10 A/D
There is no reaction to FADER potenciometer's moving .
Additional remarks :
- after any key pressed , the LED "Trigger" begins to light randomly , but sinchronicaly with the noise .
- the noise is generated by DAC chip IC55 , and there is silence on the output of DAC IC51 .
- there is a strange meandr signal presents on a diagram of XRD signal
- signals CD3, CD10, CD13 are very strange and have have much differences from other CDx lines .
What I have made :
- swaped DAC IC51 with DAC IC55 - with no result , so possible the noise is generated by XP_3 and go thru ESP_2 chips to the DAC IC55 .
- replace IC27 XP_3 - with no result .
- checked signals on CPU IC28 , all signals seems normal , except XRD, CD3,CD10,CD3 .
- in working mode , cuted XRESET line from IC32 ECXITON and connected it to the ground - the noise left the same .
Possible reasons :
- CPU has some trouble in interrupts processing
- EXCITON doesn't let the MCU to process interrupts correctly .
What can you advise me to check more ?
I would be very thankful to you for any advices and possible collaboration .
Please replay to [email protected] .
Thank you .
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