mute=64)
Release Mute button
Press and hold control board
Power button
buttons?
realtime button status bitmap
(menu/sel=128, back=64, up=1,
down=2, "4=4", "3=8", "2=16",
"1=32", no button=0)
ok 0 (no
tolerance)
(8)
Release Power button
DC voltage measurements
Apply +3.0VDC, 500mA current limit in at battery contact J8 (J9 is circuit common)
Hold Power button for 3 seconds (make sure unit come on).
Measure DC voltage at audio
board:
TP16
+1.7 to +1.9VDC
(+1.8)
TP9
+3.1 to +3.5VDC
(+3.3)
D3/C37 junction
-3 to -3.6VDC
(-3.3)
U16-pin5
+4.9 to +5.1VDC
(+5.0)
C40/D4 junction
+6.9 to +7.1VDC
(+7.0)
TP-3
+4.1 to +4.9VDC
(+4.0)
TP1 (backlight)
+2.5 to +2.7VDC
+2.6
TP6
+1.39 to +1.59VDC
(+1.49)
TP15
TP6 value +/-
50mVDC
(+10mVDC)
Phantom power voltage measurements
Note:
Current measurements are made with audio input rig (described at the foot of this document) attached to the audio
input of the audio board with NO audio stimulus. Audio stimulus will light the audio LED's causing more current
pull and the audio input rig can add as much as 10 mA. Connect input rig to DUT.
Measure voltage at Audio
+2.0 to +3.0VDC
(+2.5V)
