Nortel QUAA3 Guide

QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement
Meridian 1
QCA144 1.5 MB/S Remote Peripheral
Equipment Cabinet Appendix A
Maintenance and equipment replacement
Document Number: 553-2601-500A
Document Release: Standard 2.0
Date: December 1994
Year Publish FCC TM
© 1987, 1994
All rights reserved
Printed in the United States of America
Information is subject to change without notice. Northern Telecom reserves the right to make changes in design
or components as progress in engineering and manufacturing may warrant. This equipment has been tested
and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC rules.
SL-1 and Meridian 1 are trademarks of Northern Telecom.

iii
QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement
Revision history
February 2, 1988 Version1.0. Thisappendixisreissuedtoremovereferencestorectifiersother
than the QRF12 –48 rectifier supplied with the cabinets. Changes to the
practice are indicated by a vertical bar in the margin next to the affected item.
December 1994 Standard, release 2.0. Updated to new template and editoral changes added.

v
QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement
Contents
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Fault detection and locating . . . . . . . . . . . . . . . . . . 3
Overlay programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Alarm indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Fault locating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Fault clearing procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Equipment replacement . . . . . . . . . . . . . . . . . . . . . 11
Equipment replacement procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

vii
QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement
List of figures
Figure 1
Battery cell connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 2
Expansion battery unit connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 3
Connections at rear of cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 4
Cabinet top assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 5
Shelf assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 6
Cooling unit connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

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QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement
List of tables
Table 1
Alarm indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Table 2
Fault indicators and possible causes . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Page 1 of 34
QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement
2
General
Thisappendix describes maintenance and equipmentreplacement procedures
for the QCA144 Remote Peripheral Equipment (RPE) cabinet and related
equipment.
Fault clearing for the RPE housed in the QCA144 cabinet is described in
Remote Peripheral Equipment maintenance procedures (553-2601-500).

Page 3 of 34
QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement
10
Fault detection and locating
Overlay programs
Overlay programs are used to detect most faults in the QCA144 cabinet.
These programs are described in Remote Peripheral Equipment maintenance
procedures (553-2601-500).
Alarm indications
RPE related alarms are described in Remote Peripheral Equipment
maintenance procedures (553-2601-500). Table 1 of this appendix gives the
alarm indications and causes that are unique to the QCA144 cabinet and are
not necessarily caused by a fault in the RPE.
Fault locating
Table 2 gives a cross-reference of fault indicators and associated fault type.
Some faults may be cleared simply by using Table 1. Others are cleared by
using the appropriate procedure for the type of fault indicated in Table 1.
Fault clearing procedures
The following procedures describe how to clear faults in the cabinet.
— CE/PE breaker trips on QUX19 unit—Procedure 1
— AC BRKR breaker trips on –48 V rectifier—Procedure 2
— PE2, PE3, PE4, or PE5 breaker trips—Procedure 3
— FN fuse operates or LN LED is extinguished—Procedure 4

Page 4 of 34 Fault detection and locating
553-2601-500A Standard 2.0 December 1994
Table 1
Alarm indications (Part 1 of 2)
Type of fault
Trouble indicator
CE/PE1
LED
OFF
PE 2-5
LED
OFF
RECT
LED
OFF
FN
LED
OFF
CE LN
XFR
ON
CAB
INP
OFF
REM
ALARM
ON
ATT MJ
ALARM
ON
TTY
MSG
PE1
LN XFR
ON
PE 2-5
LN XFR
ON
+5 V
+12 V
+10 V
+6 V PE1
+15 V
–15 V PE1
–12 V
–10 V
–6 V PE1
–48 V PE1
–52 V
(–47 V) AL
–52 V
(–42 V) TRIP
86 V RMS
DCON
Rectifier
Note: Individual shelf transfer if +10, –10, or –48 volts fail on shelf power converter.
(Note)
(Note)
(Note)

Fault detection and locating Page 5 of 34
QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement
PE power from
second and
third tier PE
2–5
Manual line
transfer
–150 V
Temp
Fan
Fuse
QBL24
Table 1
Alarm indications (Part 2 of 2)
Type of fault
Trouble indicator
CE/PE1
LED
OFF
PE 2-5
LED
OFF
RECT
LED
OFF
FN
LED
OFF
CE LN
XFR
ON
CAB
INP
OFF
REM
ALARM
ON
ATT MJ
ALARM
ON
TTY
MSG
PE1
LN XFR
ON
PE 2-5
LN XFR
ON
Note: Individual shelf transfer if +10, –10, or –48 volts fail on shelf power converter.
(Note)

Page 6 of 34 Fault detection and locating
553-2601-500A Standard 2.0 December 1994
Table 2
Fault indicators and possible causes (Part 1 of 2)
Fault indication Possible cause
CE/PE LED
Extinguished — Check QUX19 unit for tripped breaker.
— Check for a blown fuse on the QUAA3 and QUX19 units.
— Check connector PE1 on shelf backplane for a short or
defective wiring.
— Check for a defective QPC705 (required if bottom PE shelf is
equipped with message waiting line card).
— Check LN XFR switch on faceplate of QUAA3 unit and ensure
that it is set to 0.Wait 2 minutes for fault indication to clear.
— Press –48 V CLR button on QUAA3 unit. If fault does not clear,
replace the following items until fault clears:
• QPC705 (if equipped)
• QPC659 in PE shelf in first tier
• QUAA3 power unit
RECT/BATT LED
Extinguished — Check for tripped AC BRKR breaker on the –48V rectifier.
— Check for a blown fuse in the QBL15 battery unit (if provided).
— Check for a tripped breaker on the QBL24 battery unit (if
provided).A tripped breaker on the QBL24 unit indicates
defective batteries or a defective QBL24 unit.
PE2-5 LED
Extinguished — Check for tripped PE2, PE3, PE4, or PE5 breaker on QUX20 unit.
— Check for extinguished LED on QPC706 or QPC659 circuit pack
on the PE shelves. Replace pack with extinguished LED.
FN LED Extinguished — Check FN fuse on QUX19 unit.
LED Extinguished on
QPC705 Power
Converter
— Press the –48 V CLR button on the QUAA3 unit.
—The QPC705 or the cable connecting it is defective. Replace the
following items until the fault is cleared.
• Replace the QPC705
• Replace the cable connecting the QPC705