Lucent Technologies 4ESS SWITCH Manual page 106

To determine failing controller, observe Bit 5 of 7554 OPCODE.
In example, Bit 5 is set indicating failure is in Controller
1. The OPCODE 7554 generally indicates failure is associated
with TSI PCM splitting transformer and associated circuitry.
This failure occurred in TSI 12 SPC 3 Level 5. For this
Example failure occurred in TSI 12,
SPC 3 Level 5. Examine PCM splitting
transformer and associated TSI circuitry
for SPC 3 Level 5. Use SD-4A083 FS 7,
Symbol 56 to determine pins associated
with Controller 1. Using an oscilloscope
and two scope probes, go across both
output pins for Controller 1 (one pulse
will be "+" square wave and the other
will be "—" square wave). Compare it with
output for Controller 0. If both are "+"
or "—", suspect a bad TSI PCM splitting
transformer or cold solder joint on PCM
transformer. If opposite in polarity but
distorted, suspect a cold solder joint or
defective circuitry associated with SPC 3
Level 5
TSI-B PHASE 20 FAILURE - INDICATING CONTROLLER 1
SUMMARY
DGN:TSI 12,CONTR 1:PH 20!
M 01 DGN:TSI 12, CONTR 1 PH 20 STF (1,00000000 00000000)
TEST
12
Bit mismatch indicates
which SPC and Level
failing. Bits 0-7 indicate
lower SPC; Bits 8-15
indicate upper SPC
failure, the signal on output leads to Controller 0 were
opposite in polarity but distorted. The output of PCM
transformer is inputted to FB 221B circuit (SD-4A084, FS 11
Symbol 12). A broken wire from PCM transformer to FB 221B
circuit caused the failure.
MISMATCH SUPPLEMENTARY DATA
00020000 00020000 1232 7554
1232 K-Code indicates
failure is in TSI 12,
SPC 2 or 3
7554 OPCODE indicates read
of PCM Receiver Seems Well
in Controller 1
00000000 00000452 00000000
Issue 6
234-151-012
PAGE 1 of 1
DEC 1997
TAD
137