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Is the audio output from the monitor set at "VARIABLE" or
"FIXED" on the menu screen?
YES
Are there the audio signal outputs at pins(24)(LINE_L) and
(25)(LINE_R) of IC1403(CODEC)?
YES
Does the audio signal come from pins(24)(LINE_L) and
(25)(LINE_R) of IC1403 to pins(29) and (31) of SC2203 on
the MAIN unit?
YES
Are there the audio signal inputs at pins(29)(LINE_L) and
(31)(LINE_R) of SC501 on the TERMINAL unit?
YES
Does the audio come from pins(29)(LINE_L) and
(31)(LINE_R) of SC501 to pins(2)(L) and (4)(R) of J505?
Does the signal come to 1pin of LAN-jack J9501?
(see fig-1, fig-2)
Does the signal come to 1pin of IC9501?
(see fig-2) (IC9501: RTL8100C)
Does the 3.3Vdc come to VDD33/AVDD33 of IC9501?
Does the 2.5Vdc come to VDD25/AVDD25 of IC9501?
Does the clock signal come to 121pin of IC9501?
(25MHz, 3.3V)
Does the 200kHz clock signal come to 2pin of IC9502?
(IC9502: BR93L4RW)
Check IC9501 and its peripheral circuits.
fig-1
When IC9502 is defective, it becomes a MAIN unit exchange.
No monitor audio output
NO
NO
NO
NO
NO
No connect network
NO
NO
YES
YES
YES
LAN-jack J9501
1pin
LC-52SE94U/LC-52SE941U/LC-65SE94U
Check the bus line(SCL0/SDA0) and IC1403.
Check IC1403 and its peripheral circuits.
Check the line between IC1403 and SC2203.
Check the line between SC501 and SC2203 connectors.
Check the line between J505 and SC501, and their peripheral cir-
cuits.
Check the LINE_MUTE line and its peripheral circuits. (Q507 thru
Q509, etc.)
YES
Check the interface device and peripheral circuits.
(power-LED of hub, LINK-LED of hub)
YES
Check the line between J9501 and IC9501.
Check the LAN-jack J9501.
NO
Check the power-circuits of 3.3V.
Check Q9501. (2.5V reg-Tr)
NO
Check the line between X9501 and IC9501.
Check the crystal X9501. (SCA176WJ)
NO
Check the line between IC9502 and IC9501.
Check IC9502.
fig-2
6 – 14
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