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Issue 2
Alarm Tone Generator.
The Alarm Tone Generator is configured when dispatched from the factory to produce a 1 second
alternating 500 and 900 Hz Dee-Daa sound.
However, it is possible to produce pulsed or continuous single frequency tones which could be used
for start and stop work, class change, etc. Will remain sounding until access switch removed.
Part views of printed circuit board with top cover removed.
When the Alarm Tone Generator is accessed it will provide a “Busy” output to all universal inputs and
energise the Volume Restoration relay.
JP21
C77
C76
R121
VR10
TP4
VR9
U6
C38
R103
TR1
C64
JP22
R104
R105 D8 D9
500Hz PIPS
900Hz PIPS
SET ALARM
5
0
0
H
z
9
0
0
H
z
C
O
N
T
IN
U
O
U
S
JP21
C77
C76
R121
VR10
TP4
VR9
U6
C38
R103
TR1
C64
JP22
R104
R105 D8 D9
500Hz PIPS
900Hz PIPS
SET ALARM
5
0
0
H
z
9
0
0
H
z
C
O
N
T
IN
U
O
U
S
FACTORY
SET
900Hz
FACTORY
SET
500Hz
JUMPER
LINK
CONTINUOUS 900Hz TONE
CONTINUOUS 900Hz PIPS
JUMPER
LINK
JP21
C77
C76
R121
VR10
TP4
VR9
U6
C38
R103
TR1
C64
JP22
R104
R105 D8 D9
500Hz PIPS
900Hz PIPS
SET ALARM
5
0
0
H
z
9
0
0
H
z
C
O
N
T
IN
U
O
U
S
JP21
C77
C76
R121
VR10
TP4
VR9
U6
C38
R103
TR1
C64
JP22
R104
R105 D8 D9
500Hz PIPS
900Hz PIPS
SET ALARM
5
0
0
H
z
9
0
0
H
z
C
O
N
T
IN
U
O
U
S
CONTINUOUS 500Hz TONE
JUMPER
LINK
CONTINUOUS 500Hz PIPS
