VS Security Products SV91M Operating instructions

SV91M Operating & Maintenance Instructions
1
ZZ009143
Revision 11
Security Approved Degausser
OPERATING and MAINTENANCE
MANUAL
SV91M

SV91M Operating & Maintenance Instructions
2
Thank you for purchasing a VS Security Products
SV91M BULK TAPE DEGAUSSER
OPERATING AND MAINTENANCE MANUAL
Document Reference No. M000303
Production Standard
ZZ009143
SV91M 115v 60Hz Security Approved Degaussers
VS SECURITY PRODUCTS LTD
VS AND ASSOCIATES
17 Pegasus Court, North Lane
3160 Texas Hill Road
Aldershot
Placerville
Hampshire
California
GU12 4QP
95667
United Kingdom
United States
Tel: [phone]
Tel: [phone]
Fax: [phone]
Fax: [phone]
Email: [email protected]
Email: [email protected]
www.vssecurityproducts.com

SV91M Operating & Maintenance Instructions
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WARNING
This unit emits a strong magnetic field. Remove wrist watches before use.
Personnel fitted with a Cardiac Pacemaker should not stand within 6 feet (2.0
metres) of the unit. Operating periods in excess of specified duration will result in
exterior surfaces becoming very hot.
To help minimise the possibility of electrical shock hazards under no circumstances
should any panels be removed.
CAUTION
It is recommended that magnetic storage media is kept at least 6 feet (2 metres)
from the degausser
IMPORTANT
The power on/off switch used on this equipment is not an isolating switch. It is
recommended that this equipment should be operated from a separate switched
isolator which should be located close to the unit and within reach of the operator.
© COPYRIGHT
This document is the property of VS Security Products Limited and it may not be
reproduced, copied or exhibited to a third party without the written permission of VS
Security Products.
ENVIRONMENTAL PROTECTION
This product must not be disposed of with household waste. You are responsible
for ensuring and financing all costs of collection, treatment, recovery and
environmentally sound disposal of the goods in accordance with the WEEE
directive.
Registered Producer Number: WEE/JB2622WS

SV91M Operating & Maintenance Instructions
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TABLE OF CONTENTS
Section 1
SPECIFICATIONS………..……………………………….
5
Section 2
ACCESSORIES/OPTIONS……………………………….
5
Section 3
INTRODUCTION…………………………………………..
6
Section 4
INSTALLATION……………………………………………
7
4.1
Unpacking…………………………………………..
7
4.2
Power Requirements……………………………..
7
Section 5
OPERATION……………………………………………….
8
5.1
Cassettes & Cartridges…………………………..
8
5.2
Reels & Pancakes…………………………………
8
Section 6
INDICATORS/FEATIRES………………………………...
9
6.1
Indicator……………………………………………..
9
6.2
Overheat protector………………………………..
9
6.3
Cooling………………………………………………
9
6.4
Protection…………………………………………...
9
Section 7
MAINTENANCE/SERVICE……………………………….
10
7.1
Circuit Breaker……………………………………..
10
7.2
Bulb Replacement…………………………………
10
7.3
Cooling fan………………………………………….
10
7.4
Internal Components……………………………..
10
Section 8
TABLES…………………………………………………….
11-13
8.1
Basic Fault Finding Table………………………..
11-12
8.2
Current Monitor Test Points……………………..
13
Section 9
PARTS LIST………………………………………………..
14
Appendix A
CIRCUIT DIAGRAM……………………………………….
15

SV91M Operating & Maintenance Instructions
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SECTION 1: SPECIFICATIONS
Erasure Depth: -75db on 1500 Oe
-90db on 750Oe
Media Capacity: Beta SP, MII, D1 & D2 Cassettes
DLT, TK, LTO, 4mm, 8mm, Exabyte, Travan, DDS, DCRS, 3480,
3490 Cartridges and 1/4", 1/2", 1", 2" reels up to 16" diameter
Power Requirements:
(factory set)
ZZ 009 143
Line voltage
115V
+5% -10%
Line frequency
60Hz
Current (typical)
14A
Circuit Breaker: 15A
Erasure time: 3 seconds
Run time: 6 minutes typical
Duty cycle: 10 % to 20% depending on ambient air
Temperature
Mounting: Free standing table top
Overall Dimensions: Depth 19 inches (48cm)
Width 16.5 inches (42cm)
Height 6 inches (15cm)
Weight: Approximately 34kg

SV91M Operating & Maintenance Instructions
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SECTION 3: INTRODUCTION
A magnetic recording process is almost always preceded by an erasing process, either by bulk
degaussing or by magnetic head erasure. Erasure is a fundamental step in achieving high quality
recordings.
Bulk erasure is the preferred method due to the considerable reduction in time involved plus the
otherwise use of expensive record/reproduce/erase equipment.
The SV91M bulk degausser functions like a large electro magnet, its erasing field originating as
leakage flux from a large gap in the field structure, the SV91M structure is basically a U section.
The field intensity decreases rapidly as the distance from the degausser surface increases. For
example at a distance of approximately 2.75 inches from the degausser's surface a field strength
of only 50 oersteds exists. Furthermore, the erasing field present at the front edge nearest the
operator is also very low. It is therefore recommended that care should be taken to ensure the
entire width of tape to be erased is exposed to the effective field.

SV91M Operating & Maintenance Instructions
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SECTION 4: INSTALLATION
4.1 Unpacking
Unpack the degausser carefully, and inspect it for signs of physical damage. If damage is
apparent, a claim should be filed with the courier.
4.2 Power Requirements
Check the power supply requirements on the label attached to the back of the equipment
with the available supply. The unit is supplied with a flying 3 wire cable which, when
connected to a properly wired receptacle, earths the unit. It is essential that a proper earth
connection is made to assure safe operation.
CAUTION!
A good electrical ground must be connected to the degausser. The unit must be
connected to the correct power supply. Failure to do so may result in permanent
damage.
Connections:
Wire Colour
60Hz Unit
Brown
Hot
Blue
Cold
Yellow/Green
Ground
IMPORTANT INSTRUCTION
The mains supply outlet socket should be close to the installed equipment and fully
accessible.
NOTE:
Degausser Current Consumption
The degaussing coils are powered as part of a tuned resonant circuit. This allows quite
high circulating currents to be generated within the degaussing coils, with minimal current
consumption from the mains voltage supply. However, this technique requires that the
waveform of the supply voltage contains minimal harmonic distortion. A distorted waveform
will result in an increase in current consumption. In extreme cases excessive current will
trip the circuit breaker making it necessary to use a mains filter to remove the distortion
and reduce the current consumption.
The typical current consumption figures provided in this manual are when powered from a
supply with minimal distortion. Any increase in current consumption due to a distorted
waveform will have minimal effect on the degausser performance; however, excessive
current consumption should be avoided for obvious reasons. In the event of unexplained
high currents, please consult your supplier.

SV91M Operating & Maintenance Instructions
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SECTION 5: OPERATION
WARNING!
STRONG MAGNETIC FIELDS ARE GENERATED.
REMOVE WATCHES BEFORE USE
ENSURE THAT THE FAN OPERATES CORRECTLY DURING
USE.(AFTER INITIAL WARM UP PERIOD). OPERATING PERIODS
IN EXCESS OF SPECIFIED DURATION WILL RESULT IN EXTERIOR
SURFACES BECOMING VERY HOT.
The SV91M degausser has been designed for simplicity of operation in that it consists
basically of a flat bed over which the magnetic media is passed. Control is via a single
on/off switch and indicator.
The illuminating on/off power switch is of the latching push button type which energises the
degaussing coil. The media to be erased should be held away from the degausser whilst it
is switched on. When switched on, the degauss indicator will also illuminate.
The media to be erased should be brought slowly towards the degausser's top surface.
Place the media on the top surface against the guide at the right or left hand edge. Slide
the media across the degausser in a slow and deliberate movement taking approximately
three seconds to traverse the top face.
5.1 Cassettes and Cartridges
Cassettes and cartridges must be turned through 90 degrees and a second pass made, the
media must be turned over and the process repeated, making a total of four passes to
ensure complete erasure.
5.2 Reels and Pancakes
The media in reel or pancake form to be erased should be brought slowly towards the top
surface. The media should be placed on the surface and rotated slowly and evenly taking
approximately five seconds to complete a revolution; then remove the media slowly from
the degausser before switching off. Reels with tape wider than 1/2" should be turned over
then subjected to a second pass.
It is recommended that the degausser is switched off between media erasure as this will
reduce the internal heating and increase the operation time.

SV91M Operating & Maintenance Instructions
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SECTION 6: INDICATORS/FEATURES
6.1 Indicator
The degauss indicator is provided to give an indication of degausser coil energisation.
Certain circumstances can arise when, although the unit is switched on, the degauss coils
may not be energised.
6.2 Overheat Protection
The high energy field developed by the SV91M necessitates the generation of a
considerable amount of heat.
The degausser coil is monitored for excessively high temperatures and should this
condition occur its operation will be inhibited until the coil has cooled sufficiently.
6.3 Cooling
A thermostatically controlled cooling fan is provided to extend the continuous operating
period to a maximum.
6.4 Protection
The unit is protected by a thermal type circuit breaker. The current rating depends on the
specified operating voltage.

SV91M Operating & Maintenance Instructions
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SECTION 7: MAINTENANCE /SERVICE
The unit is basically maintenance free but periodic checks should be made to ensure the correct
operation of the fan and the good condition of the power cable.
NOTE:
To reduce the risk of shock hazard disconnect the degausser from the mains voltage
supply before carrying out any maintenance or servicing.
7.1 Circuit Breaker
To reset the circuit breaker simply 'push in' and 'release' the button.
7.2 Bulb Replacement
NOTE:
Remove Power from the unit before replacing bulbs.
7.2.1 Remove the "bulb lens" from the "switch/indicator body" by levering it forwards.
7.2.2 Remove the bulb from the rear of the "bulb housing" using a suitable extraction tool.
7.2.3 Replace the bulb noting the following:
a) The bulb will fit in only one position in a locating slot. If when fitting this does
not occur, remove the bulb
and rotate it through 180°.
7.2.4 Refit the "bulb lens" to the "switch/indicator body" by gently pushing the lens into the
"switch/indicator body" housing.
7.3 Cooling Fan
The cooling fan is of the conventional axial type powered from the ac voltage supply. The
unit is over temperature and over current protected and does not require servicing.
However in the event of failure the fan may easily be replaced from the rear of the
degausser.
Neon Voltage
Model
Power Switch
Indicator
ZZ 009 143
115v
220-240v

SV91M Operating & Maintenance Instructions
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7.4 Internal Components
Most of the internal components are replaceable, i.e. the solid state relay, toroidal
transformer and the thermal switches mounted on the degausser coil. However the tuning
capacitors and the degaussing coil are not spared items and if found to be faulty the unit
should be returned to VS Security Products for repair.
To access the components inside the degausser the laminate cover must be removed.
This entails breaking the adhesive seal using a sharp blade.
7.4.1 Solid State Relay Replacement
A thermally conductive compound should be used to ensure adequate heat dissipation
from the relay to the metal case.
7.4.2 Thermal Switch Replacement
Care must be exercised when replacing either of the switches on the degausser coil.
The switches are fitted using an epoxy resin and it is recommended that the new switch
be fitted in a new position on the coil and the old switch be left in place. The wire
connections are of the 'push on' spade type and are easily transferred to the new
switch. A high temperature epoxy resin part no. EA 200 001 should be used to secure
the new switch.
7.4.3 Cover replacement
The laminate cover should be cleaned of old adhesive before refitting, using the sealant
part no. EA 100 007.

SV91M Operating & Maintenance Instructions
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SECTION 8: TABLES
8.1 Basic Fault Finding Table
NOTE:
The table below assists fault finding down to component levels. However, should the
degaussing coil or tuning capacitors be found to be faulty it is recommended that the unit
be returned to VS Security Products for repair.
TABLE 1
Function Symptoms Possible Fault Location
_______________________________________________________________________
Fails to degauss Circuit Breaker Incorrect supply User Source
media CB1 repeatedly tripped voltage/frequency
Faulty degauss coil Inside centre and
L1 and/or tuning left hand side
capacitors C1-C4
_______________________________________________________________________
Power lamp Fails to illuminate Loss of mains User source
supply
Tripped Circuit
Breaker Rear panel
Faulty switch Front panel
Faulty neon Front panel
_______________________________________________________________________
Degauss lamp Fails to illuminate Extensive use of
degausser caused
overheating. Allow
unit to cool (not a
fault.)
Faulty neon Front panel
Faulty solid state Inside on right
relay R1 hand side
Faulty thermal Inside on front
switch SW2 end of degaussing
coil
Faulty transformer Inside front on
TX1 left hand side
Cooling fan Fails to operate Faulty thermal Inside on front
switch SW3 end of degaussing
coil
Faulty Fan M1 Rear Panel

SV91M Operating & Maintenance Instructions
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NOTE:
Degausser Current Consumption
The degaussing coils are powered as part of a tuned resonant circuit. This allows quite
high circulating currents to be generated within the degaussing coils, with minimal current
consumption from the mains voltage supply. However, this technique requires that the
waveform of the supply voltage contains minimal harmonic distortion. A distorted
waveform will result in an increase in current consumption.
The typical current consumption figures provided in this manual are when powered from a
supply with minimal distortion. Any increase in current consumption due to a distorted
waveform will have minimal effect on the degausser performance; however, excessive
current consumption should be avoided for obvious reasons. In the event of unexplained
high currents, please consult your supplier.
TABLE 2
8.2 Current Monitor Test Points
The following table contains typical current values to be measured at specific points in the
equipment.
The values given are in amperes and may differ slightly from those actually measured due to
component tolerance plus effects due to operating temperature.
Model Voltage/ Current monitor Test Points
Frequency (refer to circuit diagram)
1
2
3
4
5
6
ZZ 009 143
115v 60Hz
+5% -10%
14
8
70
39
29
0.19

SV91M Operating & Maintenance Instructions
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SECTION 9: PARTS LIST
Designation Part No. Quantity Description
CA 100 005 1 Cable gland 16mm
TB2 CG 200 001 1 Terminal Block
TB2 CG 200 002 1 End cover
TB2 CG 200 003 1 Jump bar
TB1 CM 100 023 1 Terminal Block
FM 100 033 1 Guard 120mm metal
M1 FM 100 042 1 Fan 120mm
HS 100 101 4 Feet
MP 002 505 1 SV91M Top
IND1 OI 100 031 1 Neon
SW1 OI 100 030 1 Neon
RL1 RS 100 010 1 Relay
SH 100 150 1 Relay cover
SW3 SP 100 002 1 Temperature Sensor
SW2 SW 100 016 2 Thermal switch
CB1 SW 100 017 1 Circuit Breaker 15A
SW1 SW 100 123 1 Red lens
SW1 SW 100 125 1 Switch Body
SW1 SW 100 126 1 Switch Contacts
IND1 SW 100 121 1 Yellow lens
IND1 SW 100 124 1 Indicator Body
IND1 SW 100 127 1 Dummy Socket
TX1 TX 100 030 1 Auto toroid
transformer
XX 001 118 1 Fan plate

SV91M Operating & Maintenance Instructions
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APPENDIX A: CIRCUIT DIAGRAM

SV91M Operating & Maintenance Instructions
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Supplied by:
VS Security Products Ltd.
VS and Associates.
17 Pegasus Court, North Lane
3160 Texas Hill Road
Aldershot
Placerville
Hampshire
CA 95667
GU12 4QP
United States
United Kingdom
Tel: [phone]
Tel: [phone]
Fax: [phone]
Fax: [phone]
E-mail: [email protected]
E-mail: [email protected]
http://www.vssecurityproducts.com