Clock battery backup
Posted: Fri May 16, 2014 10:35 pm
Hi all,
I'm a little bit unsure of how the battery backup for the ZX8302's clock is supposed to work, it looks like the battery should be connected with +ve to pin 40 and -ve to gnd.
However on the Issue 5 & 6 QL schematics pin 40 is connected to +5v by a link D22 on the PCB, measuring this with a multimeter reveals this to be a dead short, presumably a wire link.
Surely this will mean that the battery will try and power everything connected to the +5V line ? Or is it a case of that link must be cut if the battery is fitted ? I checked with the QIMI instructions but they seemed to say nothing about this.
Cheers.
Phill.
I'm a little bit unsure of how the battery backup for the ZX8302's clock is supposed to work, it looks like the battery should be connected with +ve to pin 40 and -ve to gnd.
However on the Issue 5 & 6 QL schematics pin 40 is connected to +5v by a link D22 on the PCB, measuring this with a multimeter reveals this to be a dead short, presumably a wire link.
Surely this will mean that the battery will try and power everything connected to the +5V line ? Or is it a case of that link must be cut if the battery is fitted ? I checked with the QIMI instructions but they seemed to say nothing about this.
Cheers.
Phill.