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

ix
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

Fault detection and locating Page 7 of 34
QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement
LED Extinguished on
QPC706Power
Converter
—Checkfor tripped breaker onQUX20 unit.
—Check circuit packs on affected shelfby unseating all packs,
resetting the power and reinserting packs one at a time.If all
circuit packs are good, replace the following items untilfault is
cleared:
•Affected QPC706 converter
Caution: Corresponding breaker onQUX20 unit(Figure 5) must be
set to OFF before removing or inserting a QPC706 converter.
•Power distribution cable going to shelf
•QUX20 unit
DC ON LED
Extinguished —Check commercial ac power supply.
—Check DC BRKR on QBL24 battery box (if equipped).
—Check F1 and F2 fuses (if equipped) on –48 V rectifier.If blown,
replace rectifier.
LED Lit onPower Fail
Transfer Unit (PFTU) —At the local site, load program 35 and enter command CMAJ.
—If fault does not clear, check thefollowing at the local site:
•Cable onfaceplate of PFTU and ensure that it is secure
•Check transferswitches on underside of consoles
•Check P10 cable connections at cross-connect terminal
•Check wiring to consoles
•If fault persists, replace PFTU
Table 2
Fault indicators and possible causes (Part 2 of 2)
Fault indication Possible cause

Page 8 of 34 Fault detection and locating
553-2601-500A Standard 2.0 December 1994
Procedure 1
CE/PE1 breaker on QUX19 unit trips
Step Action Verification
1Reset breaker. If breaker does not trip, fault has cleared.
If breaker trips, proceed with next step.
2Unseat the QPC659 buffer pack in the PE
shelf in the first tier (base) of the cabinet.
Reset breaker.
If breaker trips, replace power distribution
cable at rear of cabinet.If breaker does
not trip, proceed with next step.
3 Set breakers to OFF. Unseat all
remaining circuit packs from PE shelf.Set
breaker to ON.
If breaker trips, replace the shelf
backplane.
4 Set breaker to OFF. Inset QPC659 pack.
Reset breaker ON. If breaker trips.replace defective
QPC659 pack.
5 Reinsert circuit packs one at a time until
circuit breaker trips. If breaker trips when a pack is inserted, it is defective. Replace pack.

Fault detection and locating Page 9 of 34
QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement
Procedure 2
AC BRKR breaker on –48 V rectifier trips
Step Action Verification
1Reset breaker. If breaker does not trip, fault has cleared.
If fault reoccurs, replace the following
items in the order shown until the fault
clears:
— The –48 V rectifier
— The batteries (if equipped)
— The QBL24 battery box (if equipped)
— The QUAA3 power unit
— The QUX19 power unit
— The QUX20 power unit (if equipped)
2 Disconnect red and black wires from
TB3 at rear of rectifier. Reset breaker. If breaker trips, replace defective –48 V rectifier.
3 Set breaker to OFF and reconnect wires.
4 Disconnect red and black wires from
TB1 at rear of QUX19 unit.Reset
breaker.
If breaker trips and no batteries are
provided, the fault is in the red and black
wiring between TB3 of the rectifier and
TB1 of the QUX19 unit.Repair wiring.
5 Set the DC BRKR breaker on the QBL24
battery unit to OFF. Reset breaker. If breaker trips, replace the QBL24 battery box. If breaker does not trip,
replace the batteries.

Page 10 of 34 Fault detection and locating
553-2601-500A Standard 2.0 December 1994
Procedure 3
PE2, PE3, PE4, or PE5 breaker trips
Step Action Verification
1Reset breaker. If breaker does not trip, fault is cleared.
2 Check for extinguished LED on QPC706
pack associated with tripped breaker and
replace pack.Reset breaker.
If breaker does not trip, fault is cleared.
3 Unseat all circuit packs on the shelf
except the QPC706 pack.Reset breaker. If breaker trips, replace power cabling to shelf at rear of cabinet.If breaker still trips
when reset, replace the QUX20 unit.
4 Insert circuits one at a time until
breaker trips. Last circuit pack inserted is defective. Replace.
Procedure 4
FN fuse operates or FN LED is extinguished
Step Action Verification
1Remove rear EMI shields (if equipped)
and check connector J7 at rear of QUAA3
unit. Connection should be secure.
2 Ensure that FN fuses are not blown or
defective. If fuse blows when replaced, replace fan units one at a time.If fault persists,
replace cabling to cooling units at rear of
cabinet followed by QUX19 unit.
3 If fuses are good and FN LED is not lit,
replace QUAA3 unit.
Note: When not equipped with cooling units, the cable from the QUX19 unit should be connected to J7 on
the QUAA3 unit.When cooling units are equipped, J7 is connected to the cabinet wiring leading to the
cooling units.

Page 11 of 34
QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement
34
Equipment replacement
Equipment replacement procedures
The following charts describe equipment replacement procedures used when
replacing defective apparatus in QCA144 RPE cabinets.
—Battery replacement—Procedure 5
—Expansion QBL24 Battery Unit replacement—Procedure 6
—Main QBL24 Battery Unit replacement—Procedure 7
—QUAA3 Power Unit replacement—Procedure 8
—QUX19 Power Unit replacement—Procedure 9
—QUX20 Power Unit replacement—Procedure 10
—Power Distribution Cable replacement—Procedure 11
—QUA6 Power Fail Transfer Unit (PFTU) replacement—Procedure 12
—QPC705 Converter replacement—Procedure 13
—QPC706 Power Converter Circuit Pack replacement—Procedure 14
—QUD24 Cooling Unit replacement—Procedure 15
—QRF12 Rectifier replacement—Procedure 16
—Peripheral Equipment Shelf Backplane replacement—Procedure 17

Page 12 of 34 Equipment replacement
553-2601-500A Standard 2.0 December 1994
Procedure 5
Battery replacement
1 Set the AC BRKR breaker on the front of the –48 V rectifier and the
CAB INP breaker on the front of the QUX19 unit to OFF.
2 Set the DC BRKR breaker on the QBL24 battery units serving the
cabinet to OFF.
3 Remove the screws securing the cover on the QBL24 battery unit and
remove cover.
4 Disconnect the red and black wires from the + and – terminals to the
battery unit (Figure 1).
5 With caution, disconnect one at a time the black jumper wires
interconnecting the battery packs (Figure 1).
6 Remove batteries from QBL24 battery unit.
7 Place replacement batteries in QBL24 battery unit.
CAUTION
Service in the cabinet is interrupted when replacing the batteries.
WARNING
The battery cells are capable of delivering high currents when
externally short-circuited. Caution must be used when working near
the open terminals of the batteries to ensure that the terminals are not
inadvertently short-circuited.

Equipment replacement Page 13 of 34
QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement
Figure 1
Battery cell connections
+– +–
A
A
A
A
Battery packs
Battery
packs
Front of
QBL24 unit
Top View of QBL24 Battery Unit
Black
interconnecting
wires
Black wire
to QBL24 Unit
Red wire
to QBL24 Unit
Flexible conduit for power
and control wiring
553-1136
+
–
A
A
– and + connections
on each battery
pack
A
A
+
–
+
–

Page 14 of 34 Equipment replacement
553-2601-500A Standard 2.0 December 1994
8 With three black jumper wires, connect the four battery packs in series
(Figure 1). Connect the large lug on the black wire to the terminal of
the first battery pack. Connect the small lug on the wire to the
negative (–) terminal on the second battery pack. Install the remaining
wires between the second and third, and the third and fourth battery
packs. Ensure that connections to the battery terminals are secure
but do not over-tighten (maximum torque not to exceed 3.95 N.m
(35 in./lb.)).
9 Connect the black wire inside the QBL24 battery unit to the remaining
positive(+)battery terminal, and theredwire to the remainingnegative
(–) battery terminal.
10 Reinstall cover on QBL24 battery unit.
11 Set the AC BRKR breaker located on the front –48 V rectifier to ON.
12 Set the DC BRKR breaker on the front of the QBL24 battery units
to ON.
13 Set the CAB INP breaker on the front of the QUX19 or QUX21 unit
to ON.
Procedure 6
Expansion QBL24 Battery Unit replacement
1 Set the AC BRKR breaker on the front of the –48 V rectifier to OFF in
the cabinet connected to QBL24 battery unit being replaced.
2 Set the DC BRKR breaker on both QBL24 battery units serving the
cabinet to OFF.
CAUTION
Service in the cabinet is interrupted when replacing the expansion
QBL24 battery unit.

Equipment replacement Page 15 of 34
QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement
3 Removethescrewssecuringthe cover on themainQBL24batteryunit
and remove cover (Figure 2).
4 Disconnect the red and black wires from the expansion QBL24 battery
unit to the front of the main QBL24 unit (Figure 2).
5 From the main QBL24 unit, remove the flexible conduit and wiring
going to the expansion QBL24 unit (Figure 2).
6 Remove batteries from old unit and install in new QBL24 unit as
described in Procedure 5 (or install new batteries).
7 Install cover on expansion QBL24 unit.
8 Install flexible conduit and wiring from expansion QBL24 unit to main
QBL24 unit (Figure 2).
9 Connectgreenwiretolug2, black wire to terminal1ofW1andredwire
to terminal 5 of TB1 on front panel of main QBL24 unit (Figure 2).
10 Install cover on main QBL24 unit.
11 Set the AC BRKR breaker located on the front –48 V rectifier to ON in
the cabinet connected to the replacement QBL24 battery unit.
12 Set the DC BRKR breaker on the front of the QBL24 battery units
to ON.
WARNING
The battery cells are capable of delivering high currents when
externally short-circuited. Caution must be used when working near
the open terminals of the batteries to ensure that the terminals are not
inadvertently short-circuited.

Page 16 of 34 Equipment replacement
553-2601-500A Standard 2.0 December 1994
Figure 2
Expansion battery unit connections
DC
BRKR
SEN
+
–
Flexible conduit
5.5 ft (1675 mm)
in length
QBL24
BATT UN
54V/30A
AA
AA
AA
AA
AA
AA
AA
AA
AAA
AAA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AAA
AAA
DC
BRKR
SEN
+
–
QBL24
BATT UN
54V/30A
AAA
AAA
A
A
A
A
AAA
AAA
AAA
AAAAAA
AAAA
AAA
AAA
A
A
A
A
AAA
AAA
AAAA
AAAAAA
AAAA
AA
AA
AA
AA
QCAD295 Battery Cable
Connects
to cabinet
Expansion QBL24
Battery Unit
1 2 1
2
3
4
5
1
2
3
4
8
7
6
5
W1 TB1
AA
A
Green
wire
Black wire
Shield
Inside View of
Front Panel Main QBL24
Battery Unit
QCAD301
Expansion Cable
QCAD301 Cable
from Expansion
QBL24 Unit
Remove plug
to insert 90°
elbow and cable
Red wire
AA
AA
A
A
A
553-1138