Rx Audio Routing, Simplified Schematic For Chart 1-5 - Motorola MCS 2000 Service Instructions Manual

9-10

RX Audio Routing, Simplified Schematic for Chart 1-5

260mVrms
800mVpp
R0245
109mVrms
348mVpp
10K
DISC
FLUTTER
FIGHTER
C0415
SUPPORT
470pF
COMPONENTS
3
ACC
CONN
EXT
J0403
SPKR
2
1
U0200-H5
J0403-11
J0405-8
FILTERED
AUDIO
HANDSET
AUDIO
December 6, 2004
Troubleshooting RX Audio Routing, Simplified Schematic for Chart 1-5
260mVrms 107mVrms
800mVpp 324mVpp
C0236
C0202
330pF
0.22µF
F4
E4
FFIN
HEAR CLEAR i
U0250
SPK+
A2
EXP OUT
SPK-
6Vdc 6Vdc
INT
6
SPK-
SPKR
7.5V
7.88V
4
SPK+
C0229
6Vdc
R0232
0
RX_ HI
VR0418
C0434
20V 470pF
680mVrms
670mVrms
260mVrms 107mVrms
800mVpp 324mVpp
J7
PL IN
C0256
0.1µF
RX IN
H6
FFOUT
UNAT
EXP
RX
AUD
OUT
IN
H5 J5
C1
EXP IN
C0260
C0250
0.1µF
0.1µF
RX_AUDIO
1
AMP
IN
APA
U0203
9
33pF
C0228
R0238 68K
0.1µF
--
R0237
10K
+
VAG
25KHz
12.5KHz
ASFIC
U0200
240mVrms
679mVpp
254mVrms
RX
J4
718mVpp
AUD
OUT
R0234
4.7K½
40mVrms
C0240
113mVpp
40mVrms
33nF
45mVrms
127mVpp
40mVrms
C0242
R0235
3.3nF
1K½
900MHZ ONLY
PLACED ONLY
FOR iDEN
HANDSET
68P81083C20-D
C0999
.0033µF
MAEPF-25958-O