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Motorola MTR3000 User Manual

Motorola MTR3000
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4-32
Inject a 1KHz tone
with 3KHz
modulation into
the receiver with
the correct carrier
frequency.
Is there
See Note 4
demodulated
audio at BR
transmitter
output?
Verify SSI clk, FS,
data at J3601
Verify SSI clk, FS,
data at TP1819,
TP1820, TP1823
Check J3601 for
continuity
Replace U3605
No
No
Yes
No
1
Replace Board
See Note 3
Yes
Is audio
present at J7
BP-conn pins
3,7
Is audio
present at
C2637
NoNo
Verify audio at
U2604 pin 1
U2604 pin 8
U2604 pin 14
See schematic for
assistance
Yes
Is audio
present at
speaker
J3010M7?
Can the
volume be
adjus
ted using
tuner?
Audio verification
complete
Audio EEPOT U2601
Pin 9: +5v
Pin 7: GND
Pin 2: +2.5v bias
Pin 1: Audio in; 254mVRMS
Pin 10: Audio out; vary with tuner
setting.
Yes
No
Is audio
present at
C2858?
Yes
Yes
No
Verify high pass
filter and au
dio
eepot.
Is audio
present at
U2604 pin 7
and U2800
pin 8?
No
Yes
Replace U2604/
U2800 pending on
result from last
step.
Yes
Verify U2608
connections
before replacing.
U2602/U2607/U2608
Analog MUX
Pin 5: +5v
Pin 2: GND
Pin 6: 5v or GND
Pin 4: Matches pin 1 if
pin 6 is 5v. M
atches pin
3 if pin 6 is GND.
Yes
No
Figure 4-17 Audio Troubleshooting Flow Chart (Sheet 2 of 2)

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Motorola MTR3000 Specifications

General IconGeneral
BrandMotorola
ModelMTR3000
CategoryAccessories
LanguageEnglish

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