Motorola APX 7500 Detailed Service Manual page 142
Multi-bandconsolette detailed serv
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Also See for APX 7500:
- User manual (70 pages) ,
- Communications manual (2 pages) ,
- Brochure (8 pages)
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7-26
~165mVrms tone present
Verify C1846, R1838, R1837,
Is there a
R1839, C1841, C1842, C1843,
No
measureable 1kHz tone
U1808, R1840 & Q1801 are
at Q1801-4?
placed properly & the resistor
values are correct.
Yes
Verify C1845, R1842, C1844,
Is there a
No
R1841, U1808, R1843 &
measureable 1kHz tone
Q1802 are placed properly &
at Q1802-4?
the resistor values are correct.
Yes
Are there 1kHz,
Is there continuity
No
~525mVrms tones at
between K1801-3 &
T1801-4 & T1801-6?
measure ~13.1Vdc?
Yes
Verify VR1802, VR1803,
R1844, K1801, R2838, C1830
& C1829 are placed properly &
resistor values are correct.
Is there a
No
1kHz, ~775mVrms
Replace T1801.
tone across T1801-1 &
T1801-3?
Yes
~775mVrms tone present
Do Mainboard components
C1862 & T1801-3 have continuity w/
high speed board conn. pins J21-3
September 9, 2011
Is there a
measureable 1kHz tone
at Q1801-1?
Yes
Replace Q1801.
Is there a
measureable 1kHz tone
at Q1802-1?
Yes
Replace Q1802.
Verify K1801, R2838, Q1812,
No
C1870, R1831 & R1857 are
placed properly & resistor
K1801-4?
values are correct.
Yes
Verify T1801 is placed properly.
No
Does T1801-5
There may be an issue with the
internal board routing of A+.
Yes
~775mVrms tone present
& J21-6 respectively?
Yes
Verify C1862 & C1863
are placed properly.
Troubleshooting Charts and Error Codes Troubleshooting Charts
Is ~2.2Vdc
No
No
present at U1808-5 &
~9.6Vdc present at
U1808-4?
Yes
Replace U1808.
Is ~2.1Vdc
No
No
present at U1808-3 &
~9.6Vdc present at
U1808-4?
Yes
Replace U1808.
Does Q1812-3
measure ~1.1Vdc?
Yes
Does K1801-1
measure ~2.3Vdc?
Yes
Replace K1801.
Verify LINE1+ & LINE1- are
being routed properly from
No
C1862 & T1801-3 through the
flex cable & high speed board
to J21-3 & J21-6 respectively.
Figure 7-24. Wireline RX Audio - B
There may be an issue with the
internal board routing of 2.2V_WL
and/or 9.6V_WL.
There may be an issue with the
internal board routing of 2.2V_WL
and/or 9.6V_WL.
No
No
Does Q1812-2
Reprogram/Replace
measure ~2.8Vdc?
Consolette Mainboard.
Yes
Replace Q1812.
There may be an issue with
No
the internal board routing of
VCC_5V.
68009482001
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Troubleshooting
