Sony PCS-1500 Service Manual page 168

4-2. Self-diagnostics Function
V.35-2
>pass[|]if_mgr↓
>loop[|]off↓
Move up both pin 1 and 2 of
V.35 DIP switch on rear side
of network tool
(Local loop setting)
Input "1" to A1 of dial list,
select "V.35 without RS-366"
as I/F, and send it
Picture of the
local station is displayed
on monitor and voice of
the local station is
also heard?
YES
Repair of the data and timing
systems is complete
4-38
NO
EMI filter is defective
[Replace the FL200 to FL209]
Or, IC101 and its peripheral
V.35-2
V.35-3
Voltage at IC100
[5] is _5 V?
YES
Transceiver block (V.35) is
defective
[Replace IC101 and IC102]
V.35-1
NO
Voltage converter block is
defective
[Replace IC100, C100, C110]
V.35-3
PCS-1500/1500P