# HG changeset patch
# User Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
# Date 1375409791 0
# Node ID 037c9bea954c4dde66fdf3850524d3038e27a730
# Parent  8e4dac492552d67497193b6da0f275d9d1bf6f6a
Pirelli PCB: traced the earpiece and loudspeaker analog signals

diff -r 8e4dac492552 -r 037c9bea954c pirelli/audio
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pirelli/audio	Fri Aug 02 02:16:31 2013 +0000
@@ -0,0 +1,19 @@
+Tracing EARN & EARP outputs from Iota.  On L1 they go to vias at (2422,518) and
+(2449,518).  On L2 they go to vias at (2455,322) and (2492,323).  Tracing made
+difficult by flaws in steve-m's grind-down process, but they appear to go to L4,
+where they then seem to go to other vias at (491,1254) and (490,1292).  Found
+them on L7: going to immediately adjacent micro-vias at (514,1255) and
+(514,1295).  On L8 they go to the earpiece speaker.
+
+Tracing the loudspeaker signal path starting with the physical speaker connector
+on L1.  The connector part center is about (1930,212).  The connector footprint
+on L1 is damaged by steve-m's grind-down process (almost gone), but there seem
+to be micro-vias at (1756,251) and (2005,237).  On L2 they go to (1788,231) and
+(2021,264).  On L7 they go to micro-vias at (1784,262) and (1992,252).  On L8
+they go by some caps and then back to new micro-vias!  The latter are at
+(1902,220) and (1903,259).  On L7 the grind-down damage gets in the way again,
+but they appear to go to vias at (1935,218) and (1934,260).  Found them on L3:
+going to new vias at (3703,311) and (3739,313).  (It might actually be L4.)
+Found them on L7: fat traces to micro-vias at (3870,934) and (3898,869).
+Finally on L8 they go to the Winbond chip!  The speaker connection pins appear
+to be the two leftmost ones in the top row of 9 pins.