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Baldwin Boxall Communications Ltd.
Wealden Industrial Estate, Farningham Road
Crowborough, East Sussex, TN6 2JR
Telephone: 01892 664422 Fax: 01892 663146
Email: mail@baldwinboxall.co.uk
IIMP401
Issue 2 22/03/2000
ECR 1082
IMP 401
Operating Instructions
- 2 - Issue 2
Digital Message Repeater – with Record/Playback facility
The IMP401 can record a single message of up to 1 minute duration.
Recordings can be made on site and playback mode is selected by contacts wired to the input
connector. See fig 3 for connection details.
As shown above in fig 1 the unit has a bank of eight DIL switches.
They are shown in the default positions as supplied from the factory (SW3, 6, and 7 set to ON).
These switches enable various functions as follows:
Switch PCB Ident Option
1. REC DIS When switched ON recordings cannot be made, even when a microphone is
plugged into the unit.
Can be used to prevent accidental deletion of the recorded message
2. PA When ON the audio output signal is routed to the main output of the mixer or
amplifier in which the unit is installed.
If this switch is ON switch 3 MUST be OFF
3. MS When ON* the audio output signal is routed via the master gain and tone
controls of the mixer or amplifier in which the unit is installed.
If this switch is ON switch 2 MUST be OFF
4. CHIME When ON a chime or tone will precede the message, provided a suitable
module is fitted.
5. REST When ON the restoration output from the mixer or amplifier in which the unit
is installed will be activated during message playback.
6. PH POWER When switched ON* phantom power is provided on pin 2 of the jack socket.
7. PH POWER When switched ON* phantom power is provided on pin 3 of the jack socket.
8. BAL I/P When switched ON the audio input should be a balanced signal.
* Default settings as supplied from the factory.
LED1
RECSW1
R21
C14
C17 C16
R3
C4 C2
C3 C1
VR1
R29
J1
C13C7C6R20R7
C15
R37 U1
R28 R4
C26
C25 C23
R31 R30
P2
R1
R2
D3
C21
R43
R42
R22
REC
DIS
PA
MS
CHIME
REST
PH
PWR
BAL I/P
R38
C10
SW2
U4
P1
C29
REG1
C27
C30
R32
R33
C28
C31
REG2
R34
U5
C22
R27
D5
TR3
R40
C18
C19
R24
R25
C20
TR1
C33
R26R9
R10
R12
R17
R13
D4
R8
C8 TR2
C11 C12
R19 U7
C24R18
D2
R39C34
R35
R38
R11
D1
P3
U3
U2
C5
U6
R6
R16
R14
R41
R5
C32
R15
R44
R45
C BALDWIN BOXALL OCT 99. PC1212-2
ON
12345678
+
+
+
+
+
Fig 1
- 3 - Issue 2
Instructions for Recording a Message
1. To make a recording plug in the microphone and press and hold the front panel “Record”
button (the LED will turn red to show that that recording is in progress).
2. Speak clearly into the microphone at a distance of approximately 15 cm.
Please note that if a chime module is fitted the user should leave a three second pause at the
start of the message to avoid talking over the chime.
3. At the end of the message release the button (the LED will go out).
4. To prevent accidental erasure of the message it is recommended that the microphone be
removed from the socket after the recording has been made.
If extra protection for the recorded message is required then SW1 may be set to ON. This
prevents recordings even when a microphone is plugged in (see fig 1).
Instructions for Replaying the Recorded Message
The drawings below illustrate how to connect the normally open contacts to play the message either
once or continually.
While the message is playing the LED will turn green.
The volume control should be set as required.
The knob and shaft may be removed after setting up to prevent further changes.
PRESS TO
RECORD
OUTPUT
LEVEL
ADJUST
MIC/LINE
INPUT
LED
RED = REC
GREEN = PLAY
5
010
LEVEL
MESSAGE
RECORD
Fig 2
1
23
4
5
CLOSE A TO PLAY
MESSAGE CONTINUOUSLY
CLOSE B TO PLAY
MESSAGE ONCE
A
A
B
B
B
A
0VACCESS
ADEPT DIN CONNECTOR VIGIL BVMX CONNECTOR
Fig 3
- 4 - Issue 2
IMP401 Specification
Overall frequency response, record to playback -3dB : 300 Hz to 3.4 kHz
Sampling frequency : 8 kHz
Maximum message duration : 60 seconds one message
Signal to noise ratio : Better than 45dB
Audio output level : 0dB
Controls : Volume
: Record
: Dual in line switches to
: select facilities
Indicators : Record / Playback LED
Message initialisation : Normally open contacts.
Power consumption : 45 mA
Supply voltage : 17-30Vdc
Lo
w
V
o
l
tage Directi
v
e
73/23/EECas amended
by93/68/EEC
EMCDirective
89/336/EEC as amended
by92/31/EECand93/68/EEC
Applies only when the item
s
are correctly fittedand operated
in or with products of our
manufacture and are installed
inarecommended enclosure.
/
