Rauland-Borg Telecenter IV Istruzioni operative

Troubleshooting

KI-1586A

Telecenter®

Troubleshooting

RAULAND-BORG CORPORATION l 3450 West

Oakton

Street, Skokie, Illinois 60076-2951 l (708) 679-0900

Table of Contents

DISPLAY PHONE DIAGNOSTICS

#73

Hardware I/O Diagnostics

..................................................................................

GeneralProcedures

..............................................................................................

System Halting and VoltageMeasurements

........................................................

Line Type Tests

C.O. and PBX Trunks

.................................................................................... 7

Speakers..

........................................................................................................8

Phone

Lines

....................................................................................................

Call-In Switches

..............................................................................................

#744

Call-in Sensitivity

(RP2)

Adjustment

..................................................................

#75

LLM Line Link Tests

............................................................................................

COMPUTER AIDED DIAGNOSTICS

Computer Monitor Set-up

..........................................................................................

Serial Port Monitor Commands

..................................................................................

Other SerialPort Output

............................................................................................

TROUBLESHOOTING AND REPAIR

TCN Find-It Fix-It Procedures

Time Saving Hints and Suggestions

....................................................................

System Won’t Run or Locks-up

............................................................................

System Will

Not Program

......................................................................................

Phone Won’t Ring

................................................................................................

Time Tones DoNot Work

....................................................................................

All-Page Problem

..................................................................................................

Phone Rings-back Upon Hanging-up

..................................................................18

System Misdials or Won’t Allow Access

(Intermittent)

......................................

Talk Path Noisy or Dead (Intermittent)

..............................................................

Crosstalk On Lines

................................................................................................

Phone Rings When Call Should Go To Attendant

........................................

..1

...

False Call-ins After All-Call or Time Tone

............................................................

Supplementary Procedures

Finding Duplicate Numbers

................................................................................20

Phone Line TAP Functions (Transfer Capability and Cradle Switch Tests)

......20

Ground ResistanceMeasurement

........................................................................

2 1

Loss Measurement

................................................................................................

Lockout (Line, Link, or Receiver)

........................................................................22

Statistics

................................................................................................................

Loop Sense Measurement

.................................................................................... 24

Line

Rebalancing Procedure

................................................................................25

Console Interface Adapter

(TC4420)..................................................................27

LCD Display Problems

(General)

........................................................................27

Single Link Staff Phone Problems

(General)

......................................................28

Speaker Intercom Problems(General)

................................................................28

Interconnect Problems(General)

........................................................................29

QUICK REFERENCE CHART

..............................................................

1989

Rauland-Borg

Corporation

(Orig.

10/88;

Rev.

l/89)

Page 1 of 30

Troubleshooting

DISPLAY PHONE DIAGNOSTICS

#73

Hardware I/O Diagnostic

Summary:

This is the primary diagnostic of the TC4 system. The #73 I/O Diagnostic is a powerful

method for exercising all of the features and functions of any physical number in the system

from one point, using a display phone. It provides direct access to TCIV hardware thru the

flat cable buses by reference to physical numbers, link numbers, and desired actions (relay

on, phone line connect, etc.). It can be used to verify physical number associations with

hardware and physical number addressing. Keep the following in mind when using the

#73

I/O Diagnostic.

Special characteristics enable dealing with in-use lines and when troubleshooting in

interconnect situations.

It bypasses all attributes, location codes and other software details.

A system halt feature permits direct measurements of d.c. voltages on flat cables

which control expansion modules.

Individual LLM lines and relays can be tested.

Caution:

Perform the #73 diagnostic when the system is not busy: It will tie up a DTMF receiver and

may interfere with other system functions, or

vice

versa

It can also leave the system in a state

unknown to the processor (e.g., by leaving a speaker relay on or leaving a phone connected

to a link). To avoid this problem, reset the system after performing this diagnostic.

GENERAL PROCEDURES

Step 1.

Dial

#73

on a display

phone. The display will ask for a Physical Number. When the number

is entered, the display phone will be connected via a link to a DTMF register. The display field

will appear as follows.

NNNN LL V HT AA

NNNN = The Subject physical number. This value can be incremented or decremented using

the telephone touch-key pad. The remaining displays fields provide a status report from the

main program on the hardware associated with the displayed Subject physical number. Any

commands entered through the touch pad will apply to the displayed Subject physical

number.

A special null procedure can be invoked for the Subject physical number. The null procedure

keeps the main program from interfering with tests on the associated hardware (e.g.: taking a

phone off-hook or grounding a call switch will not produce dial tone or a call-in).

The null procedure is normally deleted when the number is changed or when you hang up.

However, if the last keystroke before changing the Subject physical number or hanging-up

was a connect or relay on command (key

1, 2,

3),

version 102 software allows the proce-

dure to remain invoked. This allows conducting tests involving several lines and/or permits

hanging-up to release the receiver for

traffic

handling.

Page 2 of 30 1989 Rauland-Borg Corporation (Orig. 10/88; Rev. t/89)

Troubleshooting

Always clear connections and procedures established by the diagnostic by resetting the

system or issuing the appropriate disconnect commands.

LL = Link Number (00 to 15). Upon

#73

initiation, this is the link used by the test phone

and its receiver. They will remain in this link. If the displayed link number is changed, all

future connect commands use the new link number. This allows connecting two phones to a

link which is not the test phone link and enables communication which is Inaudible to the

test phone or its receiver.

This display field also changes while checking in-use lines for audio and so forth. The link

number of the in-use line will be displayed when the test phone is connected to it, using the

connect command key [

1].

The test phone link number will reappear upon return to the test

link.

v===

Activate VCM Intercom. This display indicates that there is a minimum speaker load

across the

VCMs

terminals, making it active. The V field information was not available prior to

version 102 software. To see the V displayed, select an SC25 line with a speaker and send the

relay on command (press key

[2]).

Then, send the relay off command (press key

[5])

and the

V will disappear.

HT = Hook switch (H) and Call-in switch

(T)

status for the Subject line. This field will

display some combination of two characters from the following lists (e.g.: +R).

Hook switch status character will be either +,

or N:

An off-hook is detected for the Subject line.

= An on-hook is detected for the Subject line.

No LLM or no line hybrid is detected on for the subject line.

Call-in Switch status character will be either G, R, or N:

A ground is detected on the SC25 T (call-In) terminal.

A resistor ground is detected on the T terminal

No connection is detected on the T terminal

The HT display field status indicators represent external inputs to the

TCIV.

They do not

indicate whether the associated line is in use. In some cases service requests are ignored by

the system (e.g.: NNNN >5 11) and in some cases service is provided without a service

request (e.g. most in-use C.O. trunks will not show

+).

A two-digit hexadecimal figure will appear in the HT field in software versions prior to version

102. A table for Interpreting these hexadecimal values is provided with the procedures for

performing Line Type Tests. This information can be derived from Drawing KC1461.

AA =

Number of Active

Lines

in the system (0

64). The probability that using the diag-

nostic will interfere with traffic increases directly with the number of lines in use.

1989

Rauland-Borg Corporation

(Orig.

10/88;

Rev. l/89)

Page 3 of 30

Troubleshooting

Step

Refer to the following explanations of key functions and the

keypad

illustration on the following page

and perform keystrokes as required.

Function:

[1]

Connect the line associated with the Subject physical number (NNNN) to the LLM link

(LL).

the subject line is on-hook, the LLM will send a single ring burst to the phone.

[1]

Connect the Test Phone and its receiver to the link being used by the display line. This will

enable monitoring of ongoing voice and audio for test purposes. If a conversation is inter-

rupted, announce testing and press

[4]

immediatly to return to the test link.

[2]

Turn on a speaker relay associated with the displayed physical number. If a speaker is at-

tached, this will connect the VCM (intercom amplifier) to the speaker’s terminals on the SC25

and a

will appear in the display.

To hear the VCM, connect the telephone end of the VCM to the same link as the talk/listen

phone. Typically, the VCM is connected to line 2.

[3]

Connect

the single link staff phone relay. This will connect the specified single link

staff

phone to the LLM line which is shared by all single link staff phones.

[4]

If the LLM line is not in-use, it will be disconnected from a connection ma& with the #73 di-

agnostic.

[4]

If the displayed LLM line is in-use, the test phone and its receiver will be disconnected from it

and reconnected to the test link.

[5]

[6]

Turn off the speaker relay.

Disconnect the single link staff phone relay. This will disconnect the specified single link staff

phone from the LLM line which is shared by all single link staff phones.

[7]

Increment the NNNN display field to the next higher physical number.

If the last keystroke before doing this was 1, 2, or 3, a null active list record is invoked to

block the main programs normal scanning function for this line. This will prevent the system

from producing dial tone or call-ins and so forth, allowing lines to be connected and exer-

cised without disturbance from main system functions.

[8]

[9]

[0]

[*]

[#]

Increment the LL display field to the next higher link number. This will change the default

link used when an LLM connection is made. The new link becomes the default link

Start a 941 Hz tone signal which is on for 5 seconds and off for 5 seconds. This tone may be

used for crosstalk, signal to noise ratio, and loss measurements.

Decrement the LL display field to the next lower link number. This will change the default

link used when an LLM connection is made. The new link becomes the default link.

Decrement the NNNN display field to the next lower physical number.

Comments under

[7]

apply here also.

Stop the 941 Hz tone.

If the 941 Hz tone is off, the # DTMF tone will be produced and can be used for making

measurements.

Page 4 of

1989 Rauland-Borg Corporation

(Orig.

10/88;

Rev.

l/89)

Troubleshooting

Notes:

An on-hook LLM phone will ring each time a connect signal is sent to it. The ring

burst is hardware controlled by a logic hybrid and plug-in LLM line hybrid.

2. If you connect two LLM lines to the same link, they can communicate until one is

dis-

connected

or the system is reset.

Sending a speaker connect signal will cause an audible click on the SC25 as the relay

energizes. A V will appear in the display if a speaker is connected to the designated

circuit.

Caution:

If you disconnect or change links on either your own (the display phone’s) physical number

or that of the line used for the DTMF register, use of the display phone for communication

and

testing

will be terminated and the system will have to be RESET.

Test Tone A 941 Hz. test tone (5 seconds on and 5 seconds

off)

can be obtained for performing audio

measurements or listening tests. The tone is available to the test phone or any phone in the

link with it. Little display interaction is required, so any phone can be used which has its

B:78

attributes set to on. Tone levels are affected by the phone’s impedance, the test phone line

hybrid, the number of phones in the test link, and component tolerance in the MI0 generator

circuits. Typically, tone levels are as follows:

.25

vrms,

-10 dbm at the receiver connection to an LLM (0 or 1)

.10

vrms,

-17 dbm across a phone line.

Note:

The telephone keys

operate as a two by

three matrix: Each

vertical pair (e.g.: 1

and 4, 8and 0, etc.,)

addresses a common

function (i.e.: LLM,

Speaker Relay, etc.).

The uppermost key

makes a connection

or increments a

numerical value and

the lower key of a

pair ends a connec-

tion or decrements a

numerical value.

Line

Link

No.

Decrement

1989

Rauland-Borg

Corporation (Orig.

10/88;

Rev.

l/89) Page 5 of 30

Troubleshooting

System Halting and Voltage Measurements

(#73)

Summary:

Voltage reading on flat-cable buses can be performed using the

#73

diagnostic or the diag-

nostic disk program, which is simpler and does not require access to the MIO. Either method

requires halting the system, during which time no calls can be made or features accessed.

However, this test will not disturb calls in progress. These measurements are important trou-

bleshooting aids when the TCIV is operating intermittently or is unable to access certain

physical numbers.

Step 1.

Step 2.

Step 3.

Step 4.

Step 5.

Dial

#73

and enter the physical number of the line to be tested, then ground pin 66 of the

connector

on the back of the MI0 (refer to Drawing KC1461). This ground halts the system

and produces a static condition on the flat-cable buses.

Using a one-megohm (or higher) digital meter, measure the voltages on the flat-cable pins.

For

TC4150

LLM’s,

access may be gained at the end of the flat-cable. For

TC4110

SC25’s or

TC4120

SCC25’s,

access may be gained by unplugging the flat-cable from any board not

under test. For ease of testing, a flat cable connector (e.g.:

NO3399) can be crimped to the

flat-cable to provide test access.

Refer to the

MI0

schematic

(KC1461)

to identify each pin/conductor number and

verify

the

voltage reading obtained represents the appropriate binary number.

If Physical Line 7were entered in the display, the binary number 7(0000000111) may be

verified by measuring 12

volts

on LLM flat-cable conductors

18, 20,

and 2 1 and 0 volts on

conductors 12,

13,

14, 15, 16, 17,

and 19. The least significant four bits, measured on con-

ductors 19, 20, 18, 21 (Pin 18

is at binary position 2), represent the LLM circuit number (0 to

15). The remaining bits represent the DIP switch setting of the LLM.

For speakers, the flat cable is divided into two sections. Section one is a five-bit relay select

number (0 to

24),

respectively representing relays 1 through 25. Section two is a six-bit binary

module select number which represents the DIP switch setting for the module under test.

Using a one-megohm (or higher) digital meter, measure the multiplex

(MPX)

voltage

from

the TC4150 LLM to verify the following for the specified line. This will require taking the

phone on and off-hook at the remote station associated with the physical number under test:

On-hook

Less than

volts

Off-hook

Greater than 7 volts

Open circuit

6 volts

(+/-

0.5 volts)

Note:

open circuit condition may indicate that there is no LLM or no line-hybrid for the

specified circuit. If the open circuit voltage is outside the range shown, an LLM is loading the

MPX line and needs to be repaired or replaced.

Using a one-megohm (or higher) digital meter, measure the voltage between wires

A and B

the

SC25 bus

and verify the following by using the call-in switches at the target remote

location associated with the physical number under test:

No Call-in Less than 100 mvolts

Normal Call-in Over 600 mvolts

Emergency Call-in 200 mvolts

(Note: This is from a switch with a resistor.)

Note:

Use appropriate troubleshooting techniques and schematics to progressively define any

problems in individual expansion modules, circuits, and components.

Step 6. Remove the jumper from pin

A:66.

Page

6 of

1989 Rauland-Borg Corporation

(Orig.

10/88;

Rev. l/89)

Troubleshooting

Line Type Tests

(#73)

Summary:

The I/O hardware diagnostic requires different procedures on different line types for checking

out various hardware, including remotes and wiring. These procedures bypass all program-

ming by directly operating relays and circuits based upon physical numbers. Therefore, after

connecting a relay or phone line, disconnect it before proceeding to the next physical num-

ber.Reset the system after using this function or ensure no connections remain which will

interfere with service.

Note:

Practice these procedure on a demo or known good system before using it in an actual

troubleshooting situation.

C.O.

PBX Trunks

Step 1. Dial

#73,

then enter the lowest or highest physical number of the type of trunk to be tested.

Step 2. Press

[1]

and verily one of the following conditions exist:

Trunk busy: The system connects the test phone and its receiver to the link in use.

The

field of the display will reflect the change. and a conference-call will

exist between the trunk users and test phone.

Say,

“Testing”

to announce your presence and immediately press

[

to dis-

connect from the link and return to the test phone link.

Caution:

Do not

press

[

again, it will disconnect the specified line

from

the trunk and the

call in progress will be cut-off.

Trunk idle: Dial tone is received at the test phone.

Press

[4]

to restore the trunk to idle.

Step 3. Press

[

to go to the next physical number and return to

Step

until all trunks have

been tested.

Special Notes on Central Office Trunks:

Pressing

[1]

to connect a trunk establishes loop current to the C.O. and lights the CO LED on

the associated COA module. However, if the C.O. trunk is held too long due to a defect in the

TCIV (software or other), the C.O. may cut-off or sharply reduce its d.c. feed to the trunk line.

If this happens, pressing

[1]

will not get dial tone or turn on the CO LED. The trunk will

appear dead, even with a linemans test set.

Correct the condition by opening the loop for a few seconds and then closing it. Do

this by pressing

[

twice . . . waiting a few seconds . . . and then pressing [

1].

When a trunk line is ringing-in, there will be a + in the HT display field. When the ringing

stops, and after a several second delay, the + will change to a

If a special provision has

been made for an external service request, the + will remain as long as the external service

request is asserted.

1989

Rauland-Borg

Corporation (Orig.

10/88;

Rev. t/89)

Page 7 of 30

Troubleshooting

Speakers

This test will identify open or grounded speaker lines via the

VCM

Speaker Sense current

(refer to Drawing KC1472). An alternative to the following test would be to place a meter or

meters across the D and E terminals of a target speaker to monitor dc resistance and/or

resis-

tance

to ground.

Step 1.

Step 2.

Step 3.

Step 4.

Step 5.

Note:

Dial #73, then enter the lowest or highest physical number of the group of speakers to be

tested.

Test

Option: After entering #73, enter the physical number of the VCM, press

[1]

and

then increment or decrement to the desired physical number with

[

7 or *] .

This

will

allow

talk/listen audio from each speaker when tested.

Press

[

to turn on the speaker relay and note the following if a speaker is present:

A supervisory beep occurs at the remote location.

A V appears in the display if there is an SC25 relay and speaker and the speaker

station does not have an activated privacy switch.

If the test option was selected in

Step 1, room sounds will be audible at the test

phone. If there is no audio, a ground or activated privacy switch may be present.

Press

[5]

and verify the V goes off and the supervisory beep discontinues. If this doesn’t

happen, another relay and speaker may be on.

Press

[

and verily the physical number in the display increments by one.

Return to Step 3 and repeat the above steps until all speakers have been tested.

Some tests

require monitoring the

display field. If the software in use is prior to version

102, a two-digit hexadecimal value will be displayed instead of the characters noted in the

procedures. If a hexadecimal value appears, use the following #73 Hexadecimal Equivalents

Table to interpret the display.

Find the displayed hexadecimal

value under HEX and then locate the equivalent character set

under HT. Note

that each character set may be represented by either one of two different

two-digit hexadecimal values. The

character represents the hook-switch status and the T

character is the Call-in Switch status.

#73

Hexadecimal Equivalents Table

HEX

00 80

--G

02 82

--R 12

03 83

--N

Page 8 of 30

1989

Rauland-Borg

Corporation

(Orig.

10/88;

Rev. l/89)

Troubleshooting

Phone Lines

Method 1

This procedure can be used to test a series of lines very quickly. It is especially useful for

determining which keys of a key system are associated with which lines, as well as verifying

that lamp and audible ringing functions operate as wired or programmed. This test is not

in-

tended

to test all LLM functions of all lines in all links: Use the

#75

LLM

Line Link

Test

for

that.

Step 1.

Step 2.

Step

Note:

Dial

#73,

then enter the lowest or highest physical number of the type of phone line to be

tested.

Verify the HT display field hook switch status is correct:

if the subject phone is off-hook.

if the subject phone is on-hook.

Press

[1]

and verify one of the following conditions exist:

Line in use: The system connects the test phone and its receiver to the link in use.

A conference-call situation exists between the line users and test phone.

The

LL field of the display reflects the change.

Say, “Testing” to announce yourself and immediately press [4] to disconnect

from the link and return to the test phone link.

Press

[7]

[

to go to the next physical number and return to Step 1 to

continue testing

Caution:

Do not press

[

again: the specified line will be disconnected,

cutting-off the call in progress.

Line idle:

One ring burst occurs each time the

[l]

pressed. If a key system, one or

more ring bursts starting immediately or after several seconds delay.

Take

the phone under test off-hook

and verify that the

changes to

in-

dicating the line hybrid detected the off-hook status of the line and transmit-

ted it to the CPU.

Verify two way communication between the test phone and the phone line

under test. If a

key system,

place the line on hold and verify the + remains

on the display. Also verify that the correct visual and audible indications

occur.

Press

[

to disconnect.

If a problem occurs in Step 3, do the following:

Check and correct any errors in the key system wiring and/or programming.

Try replacing the line hybrid in the suspect

LLM

(TC4150).

Step 4.

Press

[7]

[*]

to go to the next physical number and return to Step 2 to continue testing.

1989

Rauland-Borg

Corporation

(Orig.

10/88;

Rev. l/89)

Page

9 of 30

Troubleshooting

Phone Lines

Method 2

Two phones can be connected to a link other than the test phone link to allow them to talk

or send tones without affecting test phone commands. This will allow the advanced trou-

bleshooter to perform additional tests (e.g.: voltage measurements, functional checks, etc.).

Step 1.

Step 2.

Step 3.

Step 4.

Step 5.

Step 6.

Step 7.

Dial

#73,

note the display phone’s test LL

Display Field;

then, enter the physical number of

a phone line (phone

to be tested.

Press [0] or

[8]

to change the

Display Field

to a value different than that being used by

the test phone.

Press

[1]

to connect phone A to the selected link.

Press

[

to display the physical number of another phone line to be tested (phone

Press

[1]

to connect phone

to the selected link and verify an audio connection between

phones

and

Using phones

and

perform whatever tests are desired. During this time, the test phone

may be hung-up and phones A and

will remain out of service.

Upon completion of testing, either disconnect phones

and

by pressing [4] on the test

phone or reset the system.

Call-in

Switches

The main program detects the status of each call-in

switch

as a function of its relationship to

ground. This enables the system to distinguish different types of call-ins. In case of problems

perform the

#74

RP2

Adjustment Procedure.

step 1.

Step 2.

Step

Dial

#73,

then

enter the lowest or highest physical number of the call-in switch lines to lx

tested

Note

character displayed in the

display

field

= ground on the T terminal, indicating an active normal call-in.

R =

resistive ground on the

terminal, indicating an active emergency call-in.

N = no connection is detected on the

terminal,

indicating the switch is passive.

Place a normal or emergency call-in, or simulate one as follows.

Normal

Ground

the

call-in line.

Emergency

Place a 1.5k resistor to ground on the call-in line.

Step 4.

Verify

LIT display field changes and provides

the

correct indication (as defined in Step 2).

Step 5. Repeat steps

and 4 for any untested switch positions, ending with the N displayed. Then,

press

[7]

[

to go to the next physical number and return to Step 2 to continue testing.

Page 10 of 30

1989

Rauland-Borg Corporation

(Chg.

10/88; Rev.

t/89)

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