Bell System 9nn Series Manuale utente

Bell Technical Support

System

Tel 0845 121 4008

(Telephones) Ltd

Fax 0845 121 4009

Email technical@bellsystem.co.uk

Web www.bellsystem.co.uk

Troubleshooting Guide

Audio Door Entry Systems (single entrance)

9nn, VRKn or BLn series)

Most systems use the 801 phone, 801P on systems above 20 flats.

Twisted-pair cable must be used CW1308 telephone or Cat5e data cable). Alarm

cable is not recommended and can cause problems with speech.

Phone connections

Terminal

Meaning

I Call / call button 12V to ring)

R Microphone

O Common for ring, speech and lock button 0V)

T Speaker

Z Lock button Z shorts to O when the lock button is pressed)

V 12V DC Phone supply BS-LX and 500X series only)

L Door Monitor connecting L to 0V brings green LED on, BS-LX and

500L series only)

51 Speech unit – 12V AC or DC operation

61 Speech unit – 12V AC or DC operation

801 Series phone with Electronic ring – 12V AC or DC operation

801 Series phone with Mechanical buzzer – 12V AC only

500A, PA – 12V AC only, other 500 series 12V DC only

If a phone has 500 PAD on it check which letters are crossed out. If the A is crossed

out the model is a 500PD.

BS-LX phone – 12V DC only

ommon Faults

A very high percentage of calls to our technical support number, regarding new

installations, are resolved to faulty wiring. The reasons for these are various: -

• Broken cores, especially short links, sometimes broken inside the insulation.

• Connectors clamped onto the insulation instead of copper.

• Short or open circuits due to cables having been stapled or nailed through.

Bell Technical Support

System

Tel 0845 121 4008

(Telephones) Ltd

Fax 0845 121 4009

Email technical@bellsystem.co.uk

Web www.bellsystem.co.uk

• A common fault is wiring a connector left to right instead of right to left, or one or

more twisted pairs the wrong way round.

Tip. The heads of screws on connectors are not a reliable means of making a

connection with a meter, try pushing the probe into the wire entry point.

The following tables provide a quick indication of the possible fault:

Lock Release Problems

Lock release does not

operate.

1. Connections to the Lock release are

open/short-circuited note power supply fuse

may have blown).

2. Poor connection or damaged wire in the lock

release circuit. Check cable to lock release

and cable to Z / O terminals on the phone.

3. Voltage drop issue; cable diameter is too

small, try doubling up on the lock button

cores Z & O going to the phone s).

4. Dodgy lock release button on the phone.

Simulate a lock button press by shorting Z &

O to prove.

5. Lock release current is too high if using a

third party lock release). An additional relay

and suitable power supply maybe required.

Check the lock release current plus 0.5A for

the system does not exceed the power supply

rating.

6. Lock release jammed due to over tight fitting;

check there is some ‘play’ between the lock

and lock release. Do not fit the tongue on the

door to deep.

7. Faulty lock release. Connect Z side of lock

release to H on the speech unit to force 12V

across it and test.

Bell Technical Support

System

Tel 0845 121 4008

(Telephones) Ltd

Fax 0845 121 4009

Email technical@bellsystem.co.uk

Web www.bellsystem.co.uk

Lock release buzzes, but

doesn’t unlock

1. Poor connection or damaged wire in the lock

release circuit. Check cable to lock release

and cable to Z / O terminals on the phone.

2. Voltage drop issue; cable diameter is too

small, try doubling up on the lock button

cores Z & O going to the phone s).

3. Dodgy lock release button on the phone.

Simulate a lock button press by shorting Z &

O to prove.

4. Lock release current is too high if using a

third party lock release). An additional relay

and suitable power supply maybe required.

Check the lock release current plus 0.5A for

the system does not exceed the power supply

rating.

5. Lock release jammed due to over tight fitting;

check there is some ‘play’ between the lock

and lock release. Do not fit the tongue on the

door to deep.

Lock release operates all the

time.

WARNING: Not all lock

releases are continuously

rated; this may cause it to

burn out.

1. Short on the lock button cable core going to Z

on the phones. Probably to power supply

common Terminal H or O).

2. Lock release button stuck in or faulty.

Disconnect Z terminal from the phone in

question and see if the fault disappears.

Trades button doesn’t work

where fitted)

1. No power to the Time Clock, check the time

clock can be forced on.

2. Time clock settings not working, force the

time clock on to check. Note the TS2000 -

BST) time clocks need to see the time

change to operate.

3. Time clock not working. Short the CO and

N/O terminals together to bypass.

4. Break in the trades button circuit.

Bell Technical Support

System

Tel 0845 121 4008

(Telephones) Ltd

Fax 0845 121 4009

Email technical@bellsystem.co.uk

Web www.bellsystem.co.uk

Telephone Ring Problems

Phone doesn’t ring 1. Broken wire between the call button for that flat

and the phone Terminal I). Try a spare core.

2. Broken wire between the phone Terminal O) and

the speech unit. Check if the lock button or

speech work, if either does then the O connection

is ok.

3. No voltage getting through to I and O terminals

on the phone. Check at least 10V across I and O

when the call button is pressed or shorted.

4. Dodgy call button. Short the 2 terminals to prove.

5. Missing connection between C on the speech unit

and the call buttons no phones ring).

Phone ring’s but not

heard at the entrance

1. Missing ‘R’ or shorted connection between phone

and speech unit. There will also be no speech

heard at the entrance.

BS-LX phone flashes red

and green periodically

instead of ringing

1. No 12V DC to connection ‘V’, check at least 8V

between V and O on the phone when it is ringing

highest current). Also check there is power at the

phone by pressing the bell button on the phone

and seeing the mute light come on.

Mute LED won’t light on

a phone.

not all models)

1. No 12V DC on terminal ‘V’.

Door open LED does not

come on, on the phone

not all models)

1. No 12V DC on terminal ‘V’

2. ‘L’ terminal no shorting to 0V when the door is

open. Connect L to O on the phone to check

phone.

Bell Technical Support

System

Tel 0845 121 4008

(Telephones) Ltd

Fax 0845 121 4009

Email technical@bellsystem.co.uk

Web www.bellsystem.co.uk

Speech Problems

Acoustic feedback:

Loud tone/howl at the

entrance speaker and

phone, whenever the

handset is taken off

hook. Sometimes this

effect is continuous and

sometimes it will vary

with the position of the

handset or appear only

whilst talking.

1. Either or both volume controls are adjusted too

high. Normally both A and B should be adjusted

to between one third and one half of full rotation

to achieve good speech volume without

feedback.

2. The >O= connection is not properly made. Mis-

connection of the O-line between the speech unit

and the telephone will dramatically reduce the

feedback threshold. Check your wiring for this

fault. If the phone rings or the lock button works

this cause is unlikely they also use the O).

3. There is an air gap between the speech unit and

the grill. The speech unit must be placed firmly

against the rear of the grill of the entrance panel;

if necessary use packing materials to achieve

this.

4. The Entrance Panel and Telephone are located

too closely together. If the caller can be heard

directly i.e. without the use of the entry phone

system) then the units are too close!

5. The environment is too noisy. If the entrance

panel is placed in a noisy environment such as

on a busy high street, it may be difficult to obtain

satisfactory volume levels. Try sacrificing the

volume in one direction to the benefit of the other.

6. The entrance panel is placed in an >acoustic well=.

If the entrance panel is surrounded by reflecting

walls e.g. a basement flat then acoustic feedback

may occur at lower volume levels. Try changing

the position or orientation of the panel.

7. Twisted-pair cable has not been used. The

maximum volume achievable can be reduced

with other types of cable, especially when the

amount of cable or length of runs become

significant.

Bell Technical Support

System

Tel 0845 121 4008

(Telephones) Ltd

Fax 0845 121 4009

Email technical@bellsystem.co.uk

Web www.bellsystem.co.uk

Low volume speech in

one or both directions

1. Adjust pot on 51/61 speech unit marked A with a

speaker symbol) for volume at the panel.

2. Adjust pot on 51/61 speech unit marked B with a

microphone symbol) for volume at the phone.

3. If volume cannot be increased in one direction

without feedback, the volume in the other

direction may have to be reduced as a

compromise.

4. Check model 51/61 is hard against the panel with

no gaps.

5. Check model 51/61 speech unit is the right way

round

6. If using a 61 speech unit check the microphone

single hole lines up with the hole in the panel.

7. Another phone 801, 801S and phones without

privacy of speech) is off-hook. To check either go

round each phone or:

Power the system down, disconnect cores O and

T from the speech unit and measure the

resistance between those 2 cores. A high

resistance KOhms) means all are on hook. A

resistance of Approx. 60R or less indicates a

phone off-hook, or a partial cable short for 1

direction of speech.

1 Way speech / No

speech from phone to

entrance

1. Missing or shorted ‘R’ connection

1 Way speech / No

speech from entrance to

phone

1. Missing or shorted ‘T’ connection

Low frequency hum

heard 50Hz)

NOTE: There will always

be a faint hiss/hum at the

speech unit, but you

should have to put your

ear up to it to hear it.

1. Cores R and O are not in the same pair.

2. Twisted-pair cable has not been used.

3. There is a mains cable running next to the door

entry cable.

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