68009482001 September 9, 2011
Troubleshooting Charts and Error Codes Troubleshooting Charts 7-31
Figure 7-29. 4-Wire Wireline TX Audio - B
Is there a 1kHz,
~450mVrms tone at
U1806-14?
Verify R1832, C1832, R1833,
C1833, R1858, U1806 & R1836
are placed properly & the
resistor values are correct.
Is ~4.8Vdc
present at U1806-3 &
~9.6Vdc present at
U1806-4?
There may be an issue with the
internal board routing of 4.8V_WL
Is there a 1kHz,
~450mVrms tone at
U1805-5?
~450mVrms tone not present
Replace U1806.
Verify U1805, C1831, R1888, R1886,
R1888, Q1811, R1889, C1854, R1887,
C1857, R1822 & R1821 are placed
properly & the resistor values are correct.
Does U1805-2
measure ~9.6Vdc?
Does U1805-1
measure ~9.6Vdc?
There may be an issue with the
internal board routing of
9.6V_WL.
Replace U1805
Does Q1811-4
measure ~9.6Vdc?
There may be an issue with the
internal board routing of
9.6V_WL.
Does Q1811-2
measure ~2.8Vdc?
Replace Q1811
Reprogram/Replace Consolette
Mainboard.
No
No
No
No
Yes
Yes
Yes
Yes
Verify C1827, R1819, R1820, &
U1806 are placed properly &
the resistor values are correct.
Is ~4.8Vdc
present at U1806-12 &
~9.6Vdc present at
U1806-4?
There may be an issue with the
internal board routing of 4.8V_WL
and/or 9.6V_WL.
Replace U1806.
Is there a 1kHz,
~690mVrms tone at
T1800-6?
~690mVrms tone
not present
No
No No
No
Yes
Yes
Yes
Yes
Yes
No
and/or 9.6V_WL.
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