Sony PCS-1500 Service Manual page 144

4-1. Check Items Before Starting Self-diagnostics
Locating the trouble whether it is in IF-744 board or in the PCS-1500/1500P system
S-10
When the
port A only is connected
to the line, picture and sound of
the local station appear from the
2B Telecommunication
Company
loop back
YES
Picture and
sound of the local station
appear from the 6B
Telecommunication Company
loop back
NO
Picture and sound of
the local station appear from
the 6B loop back
YES
Replace the IF-744 board
*1: Refer to (*1) TDM loop back of BRI-2
*2: Press the START button and input
"1L" to A1, A2, B1, B2, C1, and C2
4-14
NO
A-6
YES
There is no problem
NO
PCS-1500/1500P
works when IF-744 board
is replaced
YES
Replace the IF-744 board
NO
A-6
PCS-1500/1500P