Event EZbus digital mixer not booting , LCD message says: "becoming EZbus..."
in [Repair]
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From: N_Cook on 17 Apr 2010 08:56 Dead as all functions controlled digitally, except for the display showing initial message. This is someone else's broken one, posted out there and no response "The power turns on and the green LED's next to the System and Audio buttons flash for a second and then the LCD displays "becoming EZbus... It does not advance from there. " This one has that message but no LED response. x5 visual inspection over the main board shows nothing amiss. DC rail voltages agree with the regulator types, reseated cable connectors. Not explored ESR of caps etc yet, any ideas to look for on Monday?
From: N_Cook on 17 Apr 2010 12:00 <Meat Plow> wrote in message news:3m93nj.qt1.17.1(a)news.alt.net... > On Sat, 17 Apr 2010 13:56:25 +0100, "N_Cook" <diverse(a)tcp.co.uk>wrote: > > >Dead as all functions controlled digitally, except for the display showing > >initial message. > >This is someone else's broken one, posted out there and no response > >"The power turns on and the green LED's next to the System and Audio buttons > >flash for a second and then the LCD displays "becoming EZbus... It does not > >advance from there. " > > > >This one has that message but no LED response. x5 visual inspection over > >the main board shows nothing amiss. DC rail voltages agree with the > >regulator types, reseated cable connectors. Not explored ESR of caps etc > >yet, any ideas to look for on Monday? > > > > Lots of goodies inside like USB interface, Word Clock, SPDIF, MMC, all > needing a fair amount of CPU control. My guess is the CPU is not > completing its POST for some unknown reason. Maybe there is a way to > physically reset the CPU like on a laptop where you're given a pinhole > to do this. Or a battery that can be removed to clear the CMOS. No battery or F-cap found unless on the analogue board. Start up is the same as that other one , I'd not noticed the 2 LEDs flashing on for 1 second. Changed 3 , 0.47uF caps of ESR 25 to 30R but system still hangs. Beyond checking oscillation around each of the 3 crystals its then a matter of seeing if there are data sheets for the main chips
From: N_Cook on 17 Apr 2010 12:29 I've downloaded the datasheets for the controller, Cypress AN2131QC, and 24 Bit Audio DIgital Signal Processor, Motorola XCB56362PV100 if anyone happens to be familiar with them, but I won't be fiddling until Monday
From: N_Cook on 17 Apr 2010 13:17 <Meat Plow> wrote in message news:3m9ehl.pp8.19.2(a)news.alt.net... > On Sat, 17 Apr 2010 17:29:18 +0100, "N_Cook" <diverse(a)tcp.co.uk>wrote: > > >I've downloaded the datasheets for the > >controller, Cypress AN2131QC, and > >24 Bit Audio DIgital Signal Processor, Motorola XCB56362PV100 > >if anyone happens to be familiar with them, but I won't be fiddling > >until Monday > > > > > > > > Neither are the main logic control for the EZBus. so another download for the CPLD XC95144XL, nowhere near any crystal leaving converter CS8420 and flash mem AT29C256 of the big chips
From: N_Cook on 18 Apr 2010 08:13
Chris Tansit <tansi(a)keyweb.com> wrote in message news:4bcae771$0$1491$c3e8da3(a)news.astraweb.com... > N_Cook said.... > >Dead as all functions controlled digitally, except for the > >display showing initial message. > > Find out how to do a factory reset. That and clearing the memory > or config and reflashing software (if possible) is the first thing > you want to do. > > Software accounts for approx 90% of failures on this type of gear. > EZbus FAQ's file is no longer on their site, but still on http://web.archive.org/web/20070609155547/http://event1.com/Products/Digital /EZbus_FAQs.htm#8 no mention of reset I did try powering up pressing System + Audio (the LED flash up pair) while powering up , but no change But I will try Play+Record mentioned as another make of digital mixer reset before delving more into the hardware. Any other button combination suggestions, nothing for EZbus found out there. |