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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Event EZbus digital mixer not booting , LCD message says: "becoming EZbus..."
N_Cook said..
clocks presumably related sum and diff fashion with the crystals 22.579200 and 24.57600 the CLK3 seems to come from the USB chip with a 12MHz crystal associated with it, will have to explore the Cypress datasheet So no luck on the reset? It has stored config somewhere right? If so it has to have some way of resetting a config then. I'd still go with a flash but I would be hesitant to do that without resetting first (if possible). I've found most resets codes are unpublished. Try to find out who the service agents were for them as well. Two more things about the firmware. If it does allow USB boot recovery (e.g. the firmware fails at some point in post) it is either going to fix the problem 100% or due to an underlined hardware problem do nothing. Hopefully if its truly a proper boot recovery it works before the code interfaces to the hardware. I think either way software or a hardware hang flashing it will not make you worse off if its your only option. |
#2
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Event EZbus digital mixer not booting , LCD message says: "becoming EZbus..."
Chris Tansit wrote in message
... N_Cook said.. clocks presumably related sum and diff fashion with the crystals 22.579200 and 24.57600 the CLK3 seems to come from the USB chip with a 12MHz crystal associated with it, will have to explore the Cypress datasheet So no luck on the reset? It has stored config somewhere right? If so it has to have some way of resetting a config then. I'd still go with a flash but I would be hesitant to do that without resetting first (if possible). I've found most resets codes are unpublished. Try to find out who the service agents were for them as well. Two more things about the firmware. If it does allow USB boot recovery (e.g. the firmware fails at some point in post) it is either going to fix the problem 100% or due to an underlined hardware problem do nothing. Hopefully if its truly a proper boot recovery it works before the code interfaces to the hardware. I think either way software or a hardware hang flashing it will not make you worse off if its your only option. CLK3 , not from the USB chip, comes from VCO o/p of U3, a 74HCT4046 , whose sig in comes from U29 an 04 inverter whose input comes from pin33 of the CPLD functional blocks, which is firmly stuck logic H so vicious circle of inactivity. Incidently TP4 of 8 is the only one with any activity on , one of the approx 22MHz clocks. Will have to leave exploring this for a while and get back to bread and butter work, but any suggestions for hardware checking in the meantime, welcome |
#3
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Event EZbus digital mixer not booting , LCD message says: "becoming EZbus..."
N_Cook wrote in message
... Chris Tansit wrote in message ... N_Cook said.. clocks presumably related sum and diff fashion with the crystals 22.579200 and 24.57600 the CLK3 seems to come from the USB chip with a 12MHz crystal associated with it, will have to explore the Cypress datasheet So no luck on the reset? It has stored config somewhere right? If so it has to have some way of resetting a config then. I'd still go with a flash but I would be hesitant to do that without resetting first (if possible). I've found most resets codes are unpublished. Try to find out who the service agents were for them as well. Two more things about the firmware. If it does allow USB boot recovery (e.g. the firmware fails at some point in post) it is either going to fix the problem 100% or due to an underlined hardware problem do nothing. Hopefully if its truly a proper boot recovery it works before the code interfaces to the hardware. I think either way software or a hardware hang flashing it will not make you worse off if its your only option. CLK3 , not from the USB chip, comes from VCO o/p of U3, a 74HCT4046 , whose sig in comes from U29 an 04 inverter whose input comes from pin33 of the CPLD functional blocks, which is firmly stuck logic H so vicious circle of inactivity. Incidently TP4 of 8 is the only one with any activity on , one of the approx 22MHz clocks. Will have to leave exploring this for a while and get back to bread and butter work, but any suggestions for hardware checking in the meantime, welcome From the R&C of the 4046 CLK3 must be about 200KHz, I wonder what would happen feeding 200KHz or so into the PLL ? something to try on next powering up |
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