Northern Telecom Meridian SL-1, QCA146, SL-1 Reference Manual

SL-1

2-Mbs/ Remote Peripheral Equipment

QCA146 cabinet maintenance/equipment replacement

Publication number: 553-2741-500
Product release: Group F
Document status: Standard
Date: 90 11 02

© 1987 Northern Telecom

All rights reserved

NT, Meridian1, Meridian and SL-1 are trademarks of Northern Telecom.

Title to and ownership of SL-1 software shall at all times remain with Northern Telecom. SL-1
software shall not be sold outright and the use thereof by the customer shall be subject to the
parties entering into agreement as specified by Northern Telecom.

Information contained in this document is subject to change. Northern Telecom reserves the
right, without notice, to make changes in equipment or program components as progress in
engineering, manufacturing, or technology may warrant.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

Reason for revision

90 11 02

Changes have been made to add references to publication 553-2931-500 for Generic X11
Supplementary Features (Phase 6) Remote Peripheral Equipment and include miscellaneous
updates.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

Contents

i of i page

General 1-1
Fault detection and locating 2-1

Overlay programs 2-1
Alarm indications 2-1
Fault locating 2-1
Fault-clearing procedures 2-1

Equipment Replacement 3-1

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

General

1-1 of 1 page

This Appendix describes maintenance and equipment replacement
procedures for the QCA146 Remote Peripheral Equipment (RPE) cabinet
and related equipment.

Fault clearing for the RPE housed in the QCA146 cabinet is described in
NTPs 553-2741-500 for Generic X08 and 553-2931-500 for Generic X11
with Supplementary Features.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

Fault detection and locating

Overlay programs

Overlay programs are used to detect most faults in the QCA146 cabinet.
These programs are described in 553-2741-500 (X08) or 553-2931-500
(X11 Supplementary Features).

Alarm indications

RPE related alarms are described in 553-2741-500 (X08) or 553-2931-500
(X11 Supplementary Features). Table 2-A of this Appendix gives the alarm
indications and causes that are unique to the QCA146 cabinet and are not
necessarily caused by a fault in the RPE.

Fault locating

Table 2-B gives a cross-reference of fault indicators and associated fault
type. Some faults may be cleared simply by using Table 2-A. Others are
cleared by using the appropriate chart for the type of fault indicated in
Table 2-A.

2-1 of 9 pages

Fault-clearing procedures

The following charts describe the procedures to follow to clear faults in the
cabinet.

• CE/PE Breaker Trips on QUX19 Unit - Chart 2-1

• AC BRKR or AC POWER Breaker Trips on -48 V Rectifier - Chart 2-2

• PE2, PE3, PE4 Or PE5 Breaker Trips - Chart 2-3

• FN Fuse Operates or LN LED is Extinguished - Chart 2-4

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

2-2 Fault detection and locating

RECTIFIER

(Ill.553-1292)

Note: Individual shelf transfer if +10, -10 or -48 volts fail on shelf power converter.

MSG

LN XFR

ON

LN XFR

ON

Table 2 -A
Alarm indications

TYPE OF

FAULT

+5V

+12V

+10V

+6V

+15V

-15V

-12V

-10V

-6 V

-48V

-52V AL
(-47V)

-52V TRIP
(-42V)

86V RMS

DCON

PE1

PE1

PE1

PE1

CE/PE1

LED
OFF

PE2-5

LED
OFF

TROUBLE INDICATOR

RECT

LED

OFF

FN

LED

OFF

CE LN

XFR

ON

CAB

INP

OFF

REM

ALARM

ON

ATT MJ
ALARM

ON

TTY

PE1

(Note)

(Note)

(Note)

PE2-5

PE PWR FROM SECOND
AND THIRD TIER PE 2-5

MANUAL LINE

TRANSFER

-150V

TEMP

FAN

FUSE

QBL24

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

(Note)

Fault detection and locating 2-3

Table 2 -B
Fault indication and possible causes

Fa ult in di cat io n Po ssib le 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.

1) QPC705 (if equipped).

2) QPC659 in PE shelf in first tier.

3) QUAA3 power unit.

RECT/BATT LED extinguished Check for tripped AC BRKR or AC

POWER breaker (whichever is equipped)
on the -48 V rectifier.

Check for a blown fuse in QBL15 battery
unit (if provided).

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

2-4 Fault detection and locating

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.

—co nt in ued —

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

Fault detection and locating 2-5

Table 2-B (continued)
Fault indications and possible causes

Fa ult in di cat io n Po ssib le cause

PE2-5 LED extinguished Check for tripped PE2, PE3, PE4 or PE5

breaker on QUX20 unit.
Check for extinguished LED on a

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

LED extinguished on QPC706
power converter

Press the -48 V CLR button on the

QUAA3 unit.

If fault does not clear, the QPC705 or

the cable connecting it is defective.

Replace the following items until the fault

is cleared.

1) Replace the cable connecting the
QPC705.

2) Replace the QPC705.

Check for tripped breaker on QUX20 unit
Check circuit packs on affected shelf by
unseating all packs, resetting the power
and reinserting packs one-at-a-time. If all
circuit packs are good, replace following
items until fault is cleared.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

1) Affected QPC706 converter.

2) Power distribution cable going to shelf.

3) QUX20 unit.

2-6 Fault detection and locating

Table 2-B (continued)
Fault indications and possible causes

Corresponding breaker on QUX20 unit must be set to OFF before
removing or inserting a QPC706 converter.

Fa ult in di cat io n Po ssib le cause

—co nt in ued —

CAUTION

DC ON LED
extinguished

LED lit on Power
Fail Transfer Unit
(PFTU)

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.
At local end, load program 35 and enter command

CMAJ.

If fault does not clear, check the following.

1) Cable on faceplate of PFTU and ensure that it is
secure.

2) Check transfer switches on underside of all
consoles.

3) Check P10 cable connections at cross-connect
terminal.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

4) Check wiring to all consoles.

5) If fault persists, replace PFTU.

Fault detection and locating 2-7

Chart 2-1
CE/PE1 breaker on QUX19 unit trips

St ep Ac ti on Ver if i cat io n

1 Reset breaker. If breaker does not trip, fault has

cleared.
If breaker trips, proceed with next
step.

2 Unseat the QPC659 buffer

pack in the PE shelf in the
first tier (base) of the
cabinet. Reset breaker.

3 Set breaker to OFF.

Unseat all remaining circuit
packs from PE shelf.
Set breaker to ON.

4 Set breaker to OFF. Insert

QPC659 pack.
Reset breaker ON.

5 Reinsert circuit packs one-

at-a-time until circuit
breaker trips.

If breaker trips, replace power
distribution cable at rear of cabinet.

If breaker does not trip, proceed with
next step.

If breaker trips, replace the shelf
backplane.

If breaker trips, replace defective
QPC659 pack.

If breaker trips when a pack is
inserted, it is defective. Replace
pack.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

2-8 Fault detection and locating

Chart 2-2
AC BRKR or AC power breaker on -48 rectifier trips

St ep Ac ti on Ver if i cat io n

1 Reset breaker. If breaker does not trip, fault has

cleared. If fault reoccurs, replace the
following items in the order shown
until the fault clears.

1) The -48 V rectifier.

2) The batteries (if equipped).

3) The QBL24 battery box (if
equipped).

4) The QUAA3 power unit.

5) The QUX19 power unit.

2 Disconnect red and black

wires from TB3 at rear of
rectifier. Reset breaker.

3 Set breaker to OFF and

reconnect wires.

4 Disconnect red and black

wires from TB1 at rear of
QUX19 unit. reset breaker.

5 Set the DC BRKR breaker

on the QBL24 battery unit
to OFF. Reset breaker.

6) The QUX20 power unit (if
equipped).

If breaker trips, replace defective -48
V rectifier.

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

If breaker trips, replace the QBL24
battery box.

If breaker does not trip, replace the
batteries.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

Fault detection and locating 2-9

Chart 2-3
PE2, PE3, PE4 or PE5 breaker trips

St ep Ac ti on Ver if i cat io n

1 Reset 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.

3 Unseat all circuit packs on the

shelf except the QPC706
pack. Reset breaker.

4 Insert circuits one-at-a-time

until breaker trips.

If breaker does not trip, fault is
cleared.

If breaker trips, replace power
cabling to shelf at rear of cabinet.

If breaker still trips when reset,
replace the QUX20 unit.

Last circuit pack inserted is
defective. Replace.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

2-10 Fault detection and locating

Chart 2-4
FN fuse operates or FN LED is extinguished

N
o

QUX19 should be connected to J7 on the QUAA3 unit. When cooling

t

units are equipped, J7 is connected to the cabinet wiring leading to the

e

cooling units.

When not equipped with cooling units, the cable from the

:

St ep Ac ti on Ver if i cat io n

1 Check connector J7 at rear of

QUAA3 unit. Connection should
be secure.

2 Ensure that FN fuses are not

blown or defective.

3 If fuses are good and FN LED

is not lit, replace QUAA3 unit.

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.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

Equipment replacement

The following charts describe equipment replacement procedures used
when replacing defective apparatus in QCA146 RPE cabinets;

• Battery Replacement - Chart 3-1

• Expansion QBL24 Battery Unit Replacement - Chart 3-2

• Main QBL24 Battery Unit Replacement - Chart 3-3

• QUAA3 Power Unit Replacement - Chart 3-4

• QUX19 Power Unit Replacement - Chart 3-5

• QUX20 Power Unit Replacement - Chart 3-6

• Power Distribution Cable Replacement - Chart 3-7

• QUA6 Power Fail Transfer Unit (PFTU) Replacement - Chart 3-8

• QPC705 Converter Replacement - Chart 3-9

3-1 of 26 pages

• QPC706 Power Converter Replacement - Chart 3-10

• QUD24 Cooling Unit Replacement - Chart 3-11

• QRF12 Rectifier Replacement - Chart 3-12

• Shelf Backplane Replacement - Chart 3-13

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

3-2 Equipment replacement

Chart 3-1
Battery replacement

Service in the cabinet is interrupted when replacing the batteries.

St ep Pr oced ur e

1 Set the AC BRKR or the AC POWER breaker (whichever is

equipped) 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.

CAUTION

3 Remove the screws securing the cover on the QBL24 battery unit

and remove cover.

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.

4 Disconnect the red and black wires from the + and - terminals to the

battery unit (Fig.3-1).

5 With caution, disconnect one-at-a-time the black jumper wires

interconnecting the battery packs (Fig. 3-1).

6 Remove batteries from QBL24 battery unit.
7 Place replacement batteries in QBL24 battery unit.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

—co nt in ued —

Equipment replacement 3-3

Chart 3-1 (continued)
Battery replacement

St ep Pr oced ur e

8 With three black jumper wires, connect the four battery packs in

series (Fig. 3-1). Connect the large lug on the black wire to terminal
of the first battery pack. Connect the small lug on the wire to the
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
no over-tighten (maximum torque not to exceed 35 in/lb (3.95 N.m)).

9 Connect the black wire inside the QBL24 unit to the remaining

positive (+) battery terminal, and the red wire to the remaining
negative (-) battery terminal.

10 Reinstall cover on QBL24 battery unit.
11 Set the AC BRKR or AC POWER breaker (whichever is equipped)

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.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

3-4 Equipment replacement

Chart 3-2
Expansion QBL24 battery unit replacement

St ep Pr oced ur e

1 Set the AC BRKR or the AC POWER breaker (whichever is

equipped) on the front of
the -48 V rectifier to OFF in the cabinet connected to the QBL24

battery unit being replaced.

CAUTION

Service in the cabinet is interrupted when replacing the

expansion QBL24 battery.

2 Set the DC BRKR breaker on both QBL24 battery units serving the

cabinet to OFF.

3 Remove the screws securing the cover on the main QBL24 battery

unit and remove cover (Fig. 3-2).

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.

4 Disconnect the red and black wires from the expansion QBL24

battery unit to the front of the main QBL24 unit (Fig. 3-2).

5 From the main QBL24 unit, remove the flexible conduit and wiring

going to the expansion QBL24 unit (Fig. 3-2).

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

—co nt in ued —

Equipment replacement 3-5

Chart 3-2 (continued)
Expansion QBL24 battery unit replacement

St ep Pr oced ur e

6 Remove batteries from old unit and install in new QBL24 unit as

described in Chart 1 (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 (Fig. 3-2).

9 Connect green wire to lug 2, black wire to terminal 1 of W1 and red

wire to terminal 5 of TB1
on front panel of main QBL24 unit (Fig. 3-2).

10 Install cover on main QBL24 unit.
11 Set the AC BRKR or AC POWER breaker (whichever is equipped)

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.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

3-6 Equipment replacement

Chart 3-3
Main QBL24 battery unit replacement

St ep Pr oced ur e

1 Set the AC BRKR or the AC POWER breaker (whichever is

equipped) on the front of the the -48 V rectifier to OFF in the cabinet
connected to the QBL24 battery unit being replaced.

2 Disconnect the cabinet power line cord from the commercial ac

power supply.

3 Set the DC BRKR breaker on main and expansion (if equipped)

QBL24 battery units serving the cabinet to OFF.

4 Disconnect wiring from rear of -48 V rectifier, QUX19 unit and from

terminal GRD1A on ground bus to main QBL24 unit (Fig. 3-3).
Remove wiring and flexible conduit from cabinet.

5 Install flexible conduit and wiring from replacement QBL24 unit and

to -48 V rectifier, QUX19 unit and to GRD1 ground bus terminal as
shown in Fig. 3-3.

6 If an expansion QBL24 unit is equipped, disconnect from old main

QBL24 unit and connect to new main unit as described in Chart 3-2.

7 Remove batteries from old main QBL24 and install in new main

QBL24 unit as described in Chart 1 (or install new batteries).

8 Install cover on QBL24 unit.
9 Reconnect power line cord to commercial ac power supply.

10 Set the AC BRKR or AC POWER breaker (whichever is equipped)

located on the front -48 V rectifier to ON.

11 Set the DC BRKR breaker on the front of the QBL24 battery units to

ON.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

Equipment replacement 3-7

Chart 3-4
QUAA3 power unit replacement

St ep Pr oced ur e

1 Set the AC BRKR or the AC POWER breaker (whichever is

equipped) on the front of V
the -48 rectifier to OFF.

2 Set the DC BRKR breaker on the QBL24 battery units (if equipped)

serving the cabinet to OFF.

3 Tag and disconnect connectors J1, J2, J3, J4, J5, J6, and J7 at rear

of QUAA3 unit.

4 Tag and disconnect wires from terminals

1, 2, 3, 4, 5, and 6 of TB4 at rear of QUAA3 unit.

5 Perform this step only if a QPC705 converter is installed beside the

QUAA3 unit.
From the front of the cabinet, remove screws securing
the QPC705 converter to the cabinet. Slide the QPC705
out of the cabinet and set aside.

6 From the front of the cabinet, remove the two bolts securing the right

bottom of the QUAA3 unit to the cabinet.

7 Remove the two screws securing the left side of the QUAA3 unit to

the cabinet and remove unit from cabinet.

8 Position the replacement QUAA3 unit in the cabinet and secure to

cabinet with mounting screws and bolts.

9 If previously removed, reinstall the QPC705 converter and secure to

cabinet with mounting screws.

10 At the rear of the QUAA3 unit, reconnect connectors J1, J2, J3, J4,

J5, J6, and J7.

11 On TB4 at rear of QUAA3 unit, reconnect wires 1 through to

terminals 1, 2, 3, 4, 5, and 6.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

3-8 Equipment replacement

Chart 3-4 (continued)
QUAA3 power unit replacement

St ep Pr oced ur e

12 Ensure that the 25HZ/20HZ and the LN XFR switches on the front of

the QUAA3 unit are correctly set (usually set the same as on the
removed QUAA3 unit).

13 Set the AC BRKR or AC POWER breaker (whichever is equipped

located on the front -48 V rectifier to ON.

14 If cabinet is equipped with QBL24 battery units, set the DC BRKR

breaker on the front of the units to ON.

—co nt in ued —

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

Equipment replacement 3-9

Chart 3-5
QUX19 power unit replacement

CAUTION

Service is interrupted when replacing the QUX19 power unit.

St ep Pr oced ur e

1 Set the AC BRKR or the AC POWER breaker (whichever is

equipped) on the front of the -48 V rectifier to OFF.

2 Set the DC BRKR breaker on the QBL24 battery units (if equipped)

serving the cabinet to OFF.

3 Remove screws securing cabinet top assembly (Fig. 3-4).
4 With a soldering iron, disconnect wiring from thermostat under

cabinet top assembly (Fig. 3-4).

5 At the rear of the QUAA3 unit, disconnect cable connectors P1, P5,

P6, and P7 and wiring from terminals 1, 2, 3, 4, 5, and 6 of TB4.

6 At the rear of the QUX19 unit, tag and disconnect power wiring from

TB1 and P10 wiring from TB2.

7 From the ground bus at the right rear of the cabinet, disconnect

wiring from lugs GRD2A, GRD2G and GRD1C.

8 From the front of the cabinet, remove the screws securing the

QUX19 unit to cabinet and remove unit and attached wiring from
cabinet.

9 Install replacement QUX19 unit and wiring in cabinet and secure

with mounting screws.

10 From the rear of the cabinet, position the long black and white wires

for the thermostat. Connect and solder connections to thermostat
(Fig. 3-4).

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

—co nt in ued —

3-10 Equipment replacement

Chart 3-5 (continued)
QUX19 power unit replacement

St ep Pr oced ur e

11 Install cabinet top assembly and secure with mounting screws

(Fig. 3-4).

12 Reconnect power wiring to TB1 and P10 wiring to TB2 at rear of

QUX19 unit.

13 Connect connectors P1, P5, P6, and P7 from QUX19 unit to

connectors J1, J5, J6, and J7 at rear of QUAA3 unit.

14 Connect connector PE to connector J on backplanes.
15 Connect power wiring harness containing three red wires, two blue

wires and a black wire to TB4 at the rear of the QUAA3 unit as
follows:

a) The two 10 AWG red wires to terminals 1 and 2.
b) The two 10 AWG blue wires to terminals 3 and 4.
c) The 14 AWG black wire to terminal 5.
d) The 14 AWG black wire to terminal 6.

16 At the cabinet ground bus connect the remaining wires from the

QUX19 unit as follows:
a) Black and yellow wires to terminal GRD2A on one lug.
b) Blue wire to the second lug on terminal GRD2A.
c) One black wire on each lug of terminal GRD2G.
d) One white wire on each lug of terminal GRD1C.

17 Set the CAB INP breaker on the front of the QUX19 unit to ON.
18 Set the AC BRKR or the AC POWER breaker (whichever is

equipped) on the front of the -48 V rectifier to ON.

19 Set the DC BRKR breaker on the QBL24 battery units (if equipped)

serving the cabinet to ON.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

Equipment replacement 3-11

Chart 3-6
QUX20 power unit replacement

CAUTION

Service in the cabinet is interrupted when replacing the QUX20

power unit.

St ep Pr oced ur e

1 Set the breakers on the faceplate of the QUX20 unit to OFF.
2 Set the CAB INP breaker on the QUX19 unit to OFF.
3 From the rear of the cabinet, disconnect the lead equipped with a

spade connector from the QUX20 unit to TB3 at rear of the QUX19
unit.

4 Tag and disconnect red and blue wires from terminals 2, 3, 4, and 5

(4 and 5 may be spare) of TB5 at rear of QUX20 unit.

5 From the front of the cabinet, remove the screws securing the

QUX20 unit to the cabinet and remove unit.

6 Position replacement QUX20 unit and secure to cabinet with

mounting screws.

7 From the rear of the cabinet, connect the lead equipped with a

spade connector to the terminal at TB3 at the rear of the QUX19
unit.

8 Reconnect red and blue wires to terminals 2, 3, 4, and 5 (4 and 5

may be spare) of TB5 at rear of QUX20 unit.

9 Set the required breakers on the front of the QUX20 unit to ON.

10 Set the CAB INP breaker on the QUX19 unit to ON.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

3-12 Equipment replacement

Chart 3-7
Power distribution cable replacement

Service in the cabinet is interrupted when replacing a power

St ep Pr oced ur e

1 Set the CAB INP breaker on the QUX19 unit to OFF.
2 Perform this step only if the power cable serving the first tier is being

replaced.

a) Disconnect connector P3 from the rear of the QUAA3 unit.

CAUTION

distribution cable.

b) Disconnect red and blue wires from terminals 2 and 3 of TB5 at

the rear of the QUX20 unit.

c) Disconnect the black and white wires from the distribution cable

to the GRD2 and GRD1 connections on the ground bus at the
rear of the cabinet.

d) Disconnect connectors PE2 and PE3 from the PE shelf

backplane.

e) Connect connectors PE2 and PE3 of the replacement

distribution cable to the PE shelf backplane J connectors and
connector P3 to J3 at the rear of the QUAA3 unit.

f) Connect the white and black wires equipped with ring

connectors to GRD1 and GRD2 terminals on the ground bus.

g) Connect the red and blue wires to terminals 2 and 3 of TB5 at

the rear of the QUX20 unit.

—co nt in ued —

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

Equipment replacement 3-13

Chart 3-7 (continued)
Power distribution cable replacement

St ep Pr oced ur e

3 Perform this step only if the power distribution cable for the third tier

is being replaced.

a) Disconnect connector P4 and P7 from the rear of the QUAA3

unit.

b) Disconnect red and blue wires from terminals 4 and 5 of TB5 at

the rear of the QUX20 unit.

c) Disconnect the black and white wires from the distribution cable

to the GRD2 and GRD1 connections on the ground bus at the
rear of the cabinet.

d) Disconnect connectors PE4 and PE5 from the PE shelf

backplane.

e) Connect connectors PE4 and PE5 of the replacement

distribution cable to the PE shelf backplane J connectors and
connectors P4 and P7 to J4 and J7 at the rear of the QUAA3
unit.

f) Connect the white and black wires equipped with ring

connectors to GRD1 and GRD2 terminals on the ground bus.

g) Connect the red and blue wires to terminals 4 and 5 of TB5 at

the rear of the QUX20 unit.

4 Reconnect all cables previously disconnected.
5 Set the CAB INP breaker on the QUX19 unit to ON.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

3-14 Equipment replacement

Chart 3-8
QUA6 power fail transfer unit replacement

St ep Pr oced ur e

1 Place temporary jumpers at cross-connect terminal to maintain

service on telephones involved with the QUA6 unit.

2 Remove and tag cable from connector J1 on the faceplate of the

QUA6 unit.

3 Remove screws securing QUA6 unit to wall (if mounted on wall) and

remove unit.

4 With mounting screws, mount replacement QUA6 unit.
5 Reconnect cable to connector J1 on the faceplate of the QUA6 unit.
6 Remove temporary jumpers at cross-connect terminal.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

Equipment replacement 3-15

Chart 3-9
QPC705 converter replacement

CAUTION

Service in the cabinet is interrupted when performing this step.

St ep Pr oced ur e

1 Set the CAB INP breaker on the QUX19 power distribution unit to

OFF.

2 Remove the screws securing the QPC705 converter to the cabinet.
3 Slide the QPC705 converter out of its position and disconnect the

QCAD278 power cable from the connector at the rear of the
converter.

4 Perform this step only if the QCAD278 cable is being replaced.

a) Disconnect the QCAD278 cable from terminal 2 of TB2 on the

QUX19 unit, connector P2 at the rear of the QUAA3 unit and
from the lug on the ground bus.

b) Remove cable.

5 If QPC705 is being replaced, connect existing QCAD278 cable to

connector on rear of new QPC705 converter.
If the QCAD278 cable is being replaced, connect connector 705 of

new cable to connector at rear of existing QPC705 converter.

6 Install the QPC705 in its assigned position with the QCAD278 cable

towards the rear of the cabinet. Secure the QPC705 converter to the
cabinet with mounting screws.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

3-16 Equipment replacement

7 Perform this step only if the QCAD278 power cable is being

replaced.

a) Connect connector P2 of the QCAD278 cable to connector P2

b) Connect the red wire equipped with a spade connector to

c) Connect the black wire equipped with a ring connector to GRD2

Chart 3-10
QPC706 power converter circuit pack replacement

The appropriate breaker must be OFF before attempting to

replace a QPC706 converter pack. See Fig. 3-5 for breaker

at the rear of the QUAA3 unit.

terminal 2 of TB2 at the rear of the QUX19 unit.

terminal on the ground bus at the rear of the cabinet.

CAUTION

assignments.

St ep Pr oced ur e

1 See 553-2301-511 and load overlay 32 and disable loops on shelf

containing the QPC706 converter.

2 Set the ENB/DIS switch on the QPC659 circuit pack on the PE shelf

containing the QPC706 converter to DIS.

3 Set the PE breaker corresponding to the PE shelf on the QUX20 unit

to OFF (Fig. 3-5).

4 Remove the QPC706 converter and install replacement.
5 Set the corresponding PE breaker on the QUX20 unit to ON.
6 Set the ENB/DIS switch on the QPC659 circuit pack on the PE shelf

to ENB.

7 Using overlay program 32, enable loops previously disabled.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

3-18 Equipment replacement

Chart 3-11
QUD24 cooling unit replacement

Note: QUD24 Cooling units are located in the cabinet top panel
assembly. Connections given in this chart are typical and may vary from
one installation to another. Cooling units are connected in series.

St ep Pr oced ur e

1 Remove the six screws securing the cabinet top panel assembly and

remove top (Fig. 3-4).

2 Disconnect cable from P1 connector of QUD24 unit (Fig. 3-6).
3 Disconnect the cable or terminating plug (whichever is equipped)

from connector P2 of the QUD24 unit (Fig. 3-6).

4 Remove mounting screws securing QUD24 unit to cabinet top panel

(Fig. 3-6) and remove QUD24 unit.

5 Unpack and inspect the replacement QUD24 cooling unit.
6 Install replacement QUD24 unit and secure to cabinet top panel with

mounting screws (Fig. 3-6).

7 Reconnect cable to connector P1 of the QUD24 cooling unit

(Fig. 3-6).

8 Reconnect cable or terminating plug (removed from previous

QUD24 unit) to connector P2 of the QUD24 unit (Fig. 3-4).

9 Reinstall cabinet top assembly and secure with mounting screws

(Fig. 3-4).

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

Equipment replacement 3-19

Chart 3-12
QRF12 rectifier replacement

CAUTION

Service in the cabinet is interrupted when replacing the

rectifier unless battery backup is provided.

St ep Pr oced ur e

1 Set AC BRKR breaker on the front of the rectifier to OFF.
2 Disconnect rectifier commercial power line cord from its receptacle.
3 Tag and disconnect the commercial power line cord, sense leads,

DCON lead and battery leads from the rear of the rectifier (Fig. 3-3).

4 Remove the mounting screws at the front of the rectifier and remove

the rectifier from cabinet.

5 Position the new rectifier in the cabinet and secure with mounting

screws.

6 Set the ac breaker on the new rectifier to OFF.
7 Reconnect all previously disconnected wiring (Fig. 3-3).
8 Ensure that the 110V/220V switch on the front of the new rectifier is

set to the correct voltage.

9 Connect the rectifier commercial power line cord to its receptacle.

10 Set the rectifier AC BRKR breaker on the front rectifier to ON.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

3-20 Equipment replacement

Chart 3-13
Peripheral equipment shelf backplane replacement

St epPr oced ur e

1 Log in to the system and load overlay program 32 as described in

553-2301-511.

2 Disable the PE shelf being replaced using command DISS l s, where

l is the loop number and s is the shelf number.

Note: If the loop is extended to a second PE shelf, that shelf must also

be disabled.

3 If the backplane being replaced is located on the same level as the

RPE shelf in the first tier (base) of the cabinet, remove the PE1 fuse
from the QUX19 power unit.

If the backplane being replaced is located in shelf positions 2
through 5, set the corresponding PE breaker (PE2, PE3, PE4 or
PE5)

4 Disconnect power cable from connector J on the backplane being

replaced.

5 Unseat all circuit packs from backplane being replaced.
6 Remove the hex screws securing the top and bottom of the

backplane to the cabinet and remove backplane.

7 Position the new backplane and secure to cabinet with hex screws.
8 Reconnect power cable to connector J on backplane.
9 Reconnect all cables previously disconnected from connectors on

shelf backplanes.

10 Reinsert all circuit packs previously unseated.
11 Reinsert PE1 fuse (if removed) on QUX19 unit or set PE breaker on

QUX20 unit for replaced backplane to ON.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

Equipment replacement 3-21

12 With overlay program 32 (see 553-2301-511) enable the previously

disabled shelves by entering command ENLS l s, where l is the loop
and s is the shelf number.

13 Enter **** to abort overlay program 32.

—co nt in ued —

Chart 3-13 (continued)
Peripheral equipment shelf backplane replacement

St ep Pr oced ur e

14 To test replacement PE shelf, load overlay program 30 (NWS).
15 Enter command LOOP l, where l is the loop number on which the

shelf was replaced.

16 If the system response is other than OK, refer to the trouble

indicators documented in this practice.

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

3-22 Equipment replacement

- And + Connections
On Each Battery

Pack

Figure 3-1
Battery cell connections

Front Of

QBL24 Unit

Battery

Packs

Black Wire

To QBL24 Unit

Red Wire

To QBL24 Unit

Battery

Packs

+ - + -

Flexible Conduit For Power

And Control Wiring

Top View Of QBL24 Battery Unit

Black

Interconnecting

Wires

(Ill553-1136)

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

Figure 3-2
Expansion battery unit connections

Equipment replacement 3-23

Black Wire

Green
Wire

QCAD301 Cable

From Expansion

QBL24 Unit

1 2

Shield

1

8
7
6
5

TB1

1
2
3
4

Red Wire

Battery Unit

2
3
4
5

W1

Inside View Of

Front Panel Main QBL24

DC

BRKR

SEN

++

-

Remove Plug
To Insert 90°

Elbow And Cable

QBL24

BATT UN

54V/30A

Expansion QBL24

Battery Unit

DC

BRKR

SEN

++

-

QBL24

BATT UN

54V/30A

QCAD301

Expansion Cable

Flexible Conduit

5.5 ft (1675 mm)
in Length

Connects

To Cabinet

(Ill553-1138)

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

QCAD295 Battery Cable

3-24 Equipment replacement

•

•

(Ill553-1137)

1

2

1

2

Figure 3-3
Connections at rear of cabinet

Rear View Of Cabinet

Straps For

Batteryless

Operation Only

(Store Straps With

Screws Provided

When Not in Use)

Black

Red

White

BLACK
WHITE

GND

Red and Black

Wires From
Battery Unit

(Note)

TB1

QUX19
TB1

BK

QUX20

TB2

R

Wires 1 And 2

From Battery Unit

Long Red and Black

1
2 TB4

Commercial

Power Connections

RectifierTB3

+OUT
+SENSE

-SENSE

-OUT
DC ON

Bridged White Wire

To Terminal 3

Place Wiring

DC ON

In Channel

SDI

90° Elbow

Port

Power Cord To

Commercial Power Supply

Note: These terminals are located on the QUX21 unit in PE expansion cabinets.
PE expansion cabinets are not equipped with QUX19, QUX20 or QPC705 units.

Power Cable In Flexible

Conduit From Battery Unit

Terminal 3

DC ON

Connection

(Note)

Q
P
C

7
0
5

Ground Bar

QUAA3

Lugs

GRD1A

Green

Wire

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

Figure 3-4

(Ill553-1141)

Cabinet top assembly

Screws

Thermostat

Optional Additional Shelf

Optional Additional Shelf

Equipment replacement 3-25

Louvered Top

Assembly

Two Additional

Louvers To

Accommodate

Cooling Units

Top Panel

Cooling Units

Base Cabinet

Front View Of Cabinet

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

3-26 Equipment replacement

B
F

R

LPY

LPX

LPY

B
F

R

LPY

LPX

B
F

R

LPY

LPX

Q

P
C
7
0
6

C

O
N
V

X-1

X-2

X-3

X-6/

Y-1

X-7/

Y-2

X-8/

Y-3

X-9/
Y-4PEPWR

DLB

X-1

X-2

X-4

X-3

X-7/
Y-2

X-8/

Y-3

X-9/
Y-4PEPWR

DLB

X-6/
Y-1

X-7/

Y-2

X-8/
Y-3

X-9/

Y-4PEPWR

X-1

X-2

X-4

X-3

X-6/

Y-1

X-7/
Y-2

X-8/

Y-3

X-9/
Y-4

DLB

X-5

X-10/

Y-5

X-LP__SH_

Y-LP__SH_

PE SHLF

X-LP__SH_

Y-LP__SH_

PE SHLF

X-LP__SH_

Y-LP__SH_

PE SHLF

_

X-4

X-6/

Y-1

Q

P
C

7
0
6

C

O
N
V

Q
P
C

7

0

6

C
O
N

V

Figure 3-5
Shelf assignments

X-LP__SH_ Y-LP__SH_PE SHLF

Shelf Position

4

PE4 Breaker

on QUX20

Unit

PE or RPE Shelf

Shelf Position

PE2 Breaker

RPE Shelf

2

on QUX20

Unit

X-1 X-2 X-3

Shelf Position

PE5 Breaker

Shelf Position

PE3 Breaker

DLB

X-4

B
F
R

CE/PE1 Breaker

on QUX19 Unit

LPX

5

on QUX20

Unit

3

on QUX20

Unit

Shelf Position

1

QUAA3

Power

Unit

(Ill553-1293)

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

Q
P
C
7
0

5

CONV

QUX19
Power

Distribution

Unit

QUX20
Power

Distribution

Unit 2

Rectifier

Figure 3-6

(Ill553-1142)

(Note)

Cooling unit connections

Cabinet

Top Panel

Mounting

Screws

Hole In

Panel

CU1 Connector

at Rear

of Cabinet

QUD24

Cooling Units

Equipment replacement 3-27

QCAD303

Power Cable

Mounting

Screws

P2

Rear Connectors

P1 P1

Front Connectors

Mounting

Screws

Front of

Cabinet Top Panel

Note: Cooling units are wired in series. Connections to and between
cooling units may not always be as shown.

P2

QCAD302

Power Cable

(Note)

QCAD304

Terminating Plug

(Note)

Mounting

Screws

2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-500

SL-1

2-Mb/s Remote Peripheral Equipment

QCA146 cabinet maintenance and equipment replacement

© 1987 Northern Telecom
All rights reserved.
Information subject to change without notice.
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Standard
90 11 02
Printed in Canada