Minstrel Plus User Guide
BT Minstrel Telephones were intended for retail only, however, from the 1
April 1991 Minstrel Plus is also available on rental terms. Also, from 1 April 1991 all
three ServiceCare options were available for the Minstrel Plus.
Minstrel is a one-piece telephone with a tone caller and gravity switch in the base unit
and offers the following facilities:-
LD or MF4 signalling (customer switchable).
Earth-Loop or Timed-Break recall (customer switchable).
32 Digit Last-number redial memory.
Tonecaller with volume control and off position.
13 Address memory, each address can store up to 16 digits including and
# codes and Timed Break recall.
For table or wall mounted use, (when used wall mounted, the moulding
above the telephone label should be reversed to provide a handset rest).
In addition Minstrel Plus includes:-
LCD digit display.
'soft switching' from LD to MF during a call.
re-designed handset hook for wall mounting (to facilitate 'walk-on').
battery low indicator (dot shows when battery low).
ability to combine sending digits from keypad and memory(s) in any
order, on the same call.
A three position slider switch (marked LD-MFT-MFE) is provided on the
handset. As supplied this is normally set to LD to offer Loop Disconnect with Earth- Loop
recall but may be shifted to offer MF signalling with Timed Break recall (MFT) or MF
signalling with Earth-Loop recall (MFE) as required.
There is no provision for storing PBX access pauses in any of the memory stores on
Minstrel or Minstrel Plus, this may be overcome as follows:-
Minstrel - access digit(s) may be stored in one store and used to access the line before
sending numbers stored in other stores (or manually keying digits).
Minstrel Plus - PBX access codes may be keyed manually before using stored number memory.
There is no facility for storing PBX access pauses in Last number redial store on Minstrel
or Minstrel Plus.
Made by Inventa (Malaysia)
Distributed by British Telecom
Minstrel range telephones are approved as supplied under approval number S/2981/3/J/501125
for use on Direct Exchange Lines and PBXs in categories 1,3,5 & 7.
All Minstrel range telephones have a REN of 1.
Wall mounting, wall should be vertical and not subject to vibration to prevent handset
'walking off', instruments should not be fitted where they may be brushed by people
Dimensions are 2100mm x 880mm x 660mm (height), Line Cord 3 Metres.
New Minstrel range telephones carry an 18 Month manufacturer's warranty to BT from the
date of manufacture as shown on the base of the instrument (year and week marking forming
the first four digits of the serial number). Customers will be given a 12 Month bring back
Description BT Item Code
Minstrel Telephone 5011 AR Alpine 877682
Minstrel Telephone 5011 AR Ivory 877683
Minstrel Telephone 5011 AR Coral 877684
Minstrel Plus 5021 Alpine 877841
Minstrel Plus 5021 Polar White 877842
Minstrel Plus 5021 Marble 877843
Minstrel Plus 5021 Opal 877844
Idle - Normal capacitor loop, Minstrel telephones draw not more than 5 MicroAmps on-hook
line current to maintain stored number memory, this may give apparent low-loop line test
Seized - Normal off-hook press button telephone loop. The electronic keypad and
transmission circuitry may give 'high resistance' tele loop line test conditions as with
other press button telephones.
Last number redial and stored number memories are protected by 2 'AAA type' Alkaline
batteries situated below the telephone number label. Provision and replacement of
batteries is the customer's responsibility, batteries should be changed annually and the
telephone must be disconnected from line whilst batteries are being replaced. Stored
number memory cannot be guaranteed if batteries are removed for more than 5 minutes
although in practice memory may last for over an hour.
Intermittent no dial tone complaints may occur with earlier Minstrels if batteries are not
fitted or if battery cap is not making proper contact with the contact spring.
Minstrel Plus incorporates design changes to the handset and case moulding to overcome
partial operation of gravity switch problems which could occur with wall mounted Minstrel.
Minstrel telephones have good immunity against RFI from 50kHz to 10MHz and fairly good
immunity from 10MHz to 200MHz.
MINSTREL - NO DIAL TONE
Reports of intermittent No Dial Tone on Minstrel have been investigated and it has been
proved that Minstrels with low (or no) batteries may cause a short line break when the
handset is lifted for the first time (after not being used for a period of time).
This may be seen by the exchange (especially Digital exchanges) as a dialled digit thus
breaking dial tone. The problem should not occur on Minstrels with `good' batteries fitted
provided these are making proper contact with the battery terminals.
Production modifications to prevent this occurring on Minstrels without batteries and to
ensure proper contact with battery terminals are being investigated.
In the meantime customers reporting this should be advised to check that good batteries
are fitted and making good contact with the terminal springs.
WALL MOUNTED MINSTRELS - HANDSET NOT RESTORING
Unless the handset is firmly replaced, Ring Tone No Reply or Permanently Engaged Test may
result with wall mounted Minstrels.
This can also happen where Minstrels are mounted on partition walls etc subject to
vibration or where they may be brushed by people walking by, causing the handset to 'walk
off' the rest.
BT supplied modified receiver rests designed to improve Minstrel 'handset walk-on'.