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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  3.

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] or 

[ *]

 to go to the next physical number and return to 

Step 1 

to

continue testing

Caution: Do not press 

[ 4 ]

 again: the specified line will be disconnected,

cutting-off the call in progress.

Line idle: One ring burst occurs each time the 

[l] is 

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 

[

 4] 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] or [*] 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

Summary of Contents for Telecenter IV

Page 1: ...ll Not Program 16 Phone Won t Ring 17 Time Tones Do Not Work 17 All Page Problem 17 Phone Rings back Upon Hanging up 18 System Misdials or Won t Allow Access Intermittent 18 Talk Path Noisy or Dead In...

Page 2: ...ne 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...

Page 3: ...ar 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 H Hook switch status character will be ei...

Page 4: ...hone 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 singl...

Page 5: ...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...

Page 6: ...ors 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 th...

Page 7: ...he link and return to the test phone link Caution Do not press 4 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...

Page 8: ...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 anoth...

Page 9: ...iately press 4 to disconnect from the link and return to the test phone link Press 7 or to go to the next physical number and return to Step 1 to continue testing Caution Do not press 4 again the spec...

Page 10: ...hones A and B 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 t...

Page 11: ...the MIO Monitor the test phone receiver for a clear tone while adjusting RP2 located at the front of the MI0 near the CPU flat cable in the following manner Slowly turn RP2 counter clockwise until th...

Page 12: ...16 times the time period specified in Step 2 i e if Step 2 value is 120 this period is 32 seconds Note During this time period the system is making and breaking the connection between the two phones...

Page 13: ...ng checklist Baud rate Jumper setting on TCIV CPU Com Port Serial Port COMl COM2 etc 8 bit no parity Full Duplex Input characters are displayed when returned from the TCIV Step 3 Test the program by c...

Page 14: ...ode 64100 which is FA64 in hexidecimal notation to zero enter FA64 0 0 Display the byte from the reference address and increment the address Halt the TCIV program Location Code 64100 must have been se...

Page 15: ...are connected disconnected with which receiver and if tones are produced what they are It also reports Call Control Console keystrokes Turn on the function by adding 8 192 to the Receiver Time Limit...

Page 16: ...12 Vdc and 5 Vdc A short from 5 volts to ground can be caused by a shorted over voltage protection diode Dl on the CPU This diode protects 5 volt components on the CPU from damage by 12 volts in case...

Page 17: ...tep 3 If the tone activates check the master clock and ensure it activates input by going lower than 6 vdc for 5 sec If more than one zone make sure the master clock activates all necessary zones at t...

Page 18: ...d Intermittent Step 1 Use 75 diagnostic and test all 16 links in system using a touch key to send a tone Defects with particular links can be further categorized as follows Defect on one line only Sus...

Page 19: ...ttributes for DIL instead of AAI False Call ins After All Call or Time Tones step 1 Check the amplifier gain adjustment If too high the amplifier will clip the signal and cause this symptom Step 2 Che...

Page 20: ...fers This is accomplished in two phases First the TAP function ensures that the person attempting to transfer a call does not lose it by breaking the loop for too long Second that hanging up on one ca...

Page 21: ...ep 1 Connect one end of a 100 ohm 2 watt resistor to one of the 12 Vdc M terminals on the MIO Step 2 Connect an 18 AWG wire between the other end of the resistor and a good ground such as a cold water...

Page 22: ...pt to use the line and verify it is locked out Note This lockout will not work if the line has a defect that allows it to respond to incorrect physical number addressing Link Lockout Step 1 Refer to t...

Page 23: ...or load is connected to the call in terminal There is a serious fault when the number stored here reaches 64 One such fault may be an improperly set call in sensitivity pot RP2 on the MIO If RP2 is no...

Page 24: ...f 15 ma and should be sufficient for detection by the line hybrid causing the TCIV to connect the line to a link for dial tone sending and receiving If Step 3 was successful verify a digital low on th...

Page 25: ...t press any tone buttons on the line being rebalanced as this would result in abnormal d c and damage the accuracy of the rebalancing Measure the tone level from terminal T to ground Vt and the voltag...

Page 26: ...Line Balancing Set up Part of LLM Circuit r 71 12vDC T Listening Rl R2 1OOK Matched within 1...

Page 27: ...value in Location Code 57364 again If Location Code 57364 is still set at 0 the interface board is working Step 6 Turn TCIV Power Off Step 7 Place the J3 jumper back to the NORMAL position remove the...

Page 28: ...call in terminal of the speaker Check the wiring for a short to ground or other problem Check the DIP switch setting of the Speaker Control Boards serving the problem speaker and single link staff ph...

Page 29: ...OA terminals CT and CR Other Less than 2 Vdc indicates a central office time out fault Disconnect for 2 seconds to get 48 Vdc back See Special Notes on Central Office Trunks under the Line Type Tests...

Page 30: ...2 Physical number of line to ring after DIL AAI timeout 64224 TC44OO Audio physical number of hardware TCIV line 64226 TC4400 Trunk Lines physical numbers 64228 TC4400 Attendant software TCIV lines 64...

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