Home Stereo

Home Stereo
PAS 141 Protocol: Product Guide
July 2013
Home stereo equipment
The protocol below describes a series of minimum tests that should be performed on home
stereo (audio) equipment in order that the product can be considered functional and fit for
re-use. The equipment should pass these tests in order for it to be considered suitable for
re-use and the outcome should be recorded for auditing purposes. This protocol should be
used within the framework of PAS 141 for re-using electrical equipment. The tests are
general in nature so that the protocol can be applied as widely as possible. As a
consequence, specific testing procedures and techniques are not described and appropriate
equipment should be used to complete the described protocols.
Scope
This protocol refers to all home stereo equipment, including separate amplifiers and external
subwoofers and speakers, but does not include portable personal audio players (e.g. MP3
players) or digital / analogue radios. The original equipment manufacturer’s user manual
should be used where available to ensure the equipment functions as originally intended.
Test procedure1
In addition to the specific tests, inspection of the electrical and electronic equipment prior to
use should be performed to ensure compliance with the law. For example, all equipment
should undergo Portable Appliance Testing to ensure electrical safety. Inspection of the
cosmetic condition of the equipment should also be performed to ensure that the external
casing is not damaged in such a way that could affect the future performance of the product
(e.g. a crack in the casing that could lead to degradation of the internal components).
Where separates2 are being tested, the use of supplementary amplifiers and speakers may
be needed to test the functionality.
1
Sources include user manuals from Goodmans, Panasonic, Philips and Sony, and “Maintaining
portable electric equipment in low-risk environments”, HSE 2012.
2
Refers to systems that do not have built-in speakers or amplifiers.
Preparation
process
Visual
Inspection
Component
Speaker /
subwoofer covers
Knobs, switches,
fixings and rear
connectors
Casings and back
panels
Remote control
Battery
compartments
Safety
Function test
Test
Check the condition of the cover(s).
Check the condition of the knobs,
switches, fixings and rear connectors.
Examine casings and back panels of the
device and speakers/ subwoofers.
Check the condition of the remote
control (if applicable).
Check the battery compartments on the
device (if applicable) and remote
control.
Plug and lead
cables
Examine the plug (insulated) and lead
cables.
External speaker/
subwoofer wiring
Radio tuning (if
applicable)
Radio pre-set
stations (if
applicable)
Audio playback
from internal
source
Audio playback
from external
source (if
applicable)
Audio input (if
applicable)
Examine the external wiring.
Headphone output
Main audio controls
Speakers/
subwoofers
Clock function and
LED display
Remote control
External audio
device docking (if
applicable)
Check that the tuner can receive the
stated FM / AM / LW / Digital signals.
Test the ability of the device to store
radio stations as pre-sets.
Insert an audio CD and test the
playback. Insert a cassette (if
applicable) and test the playback.
Connect an external audio device
through all available ports (e.g. auxiliary
jack, USB) and test the playback.
Connect a microphone or recording
device to the audio in jack and record
audio.
Connect a headphone set to the audio
out jack and play audio.
Check that the device performs its main
audio functions by inserting/connecting
an audio source and adjusting the
controls on the device: power, volume,
play, bass, treble, etc.
Test the condition of the voice coil,
spider and cone by turning the volume
to a normal listening level and the bass
to full for a short period.
Check that the appropriate information
(clock, track time, track number, radio
station etc.) is shown in the display
area.
Set the clock to ‘00:00’ and then to
‘22:22’ to check that the display works.
Adjust to the correct time.
Check that the symbols on the remote
control can be read and that it can
perform the functions on the main unit:
power, volume, play, bass, treble, etc.
Insert a device into the docking station.
Test results
The cover(s) are present and
largely undamaged.
All should be present and
undamaged.
There are no fractures
And no corrosion present.
The remote control is present
with no visible damage.
Compartment should be clean
and dry and terminals
undamaged and not
corroded.
All in good condition, sleeved,
with correct fuse, correctly
and securely connected.
All external wiring is insulated
and undamaged.
The tuner receives FM / AM /
LW / Digital signals.
The device should be able to
store the radio stations as
pre-sets.
The device plays the audio
stored on the CD and
cassette (if applicable).
The device plays the audio on
the external device through
all available ports.
The audio records.
The audio is clearly audible
through the headphone set.
The audio playback adjusts
according to the change in
audio function control.
The audio should not be
heavily distorted.
All appropriate information is
shown in the display area.
All seven bars of all four LED
clock display sections light
up. The clock can be set and
keeps time.
All control markings are
visible and the device
responds to the remote
control.
The external audio device
charges and responds to
commands from the device.
Further information and relevant equipment
All former user identification (e.g. asset tags, portable appliance test stickers, company logos
etc.) should be removed. Manufacturers brand labels and rating plates should not be
removed. If any process fails the unit may require disassembly and / or repair. Identify any
hazards, risks and controls before the appliance is disassembled to reduce risk. Where
replacement components are required to replace a missing or faulty component, such
replacements must not impair the product safety. The appliance should then be retested for
safety and for function.
Where replacement components are to be used, they should be original equipment
manufacturer (OEM) replacement components, OEM approved patter components, reclaimed
identical components or aftermarket components appropriate for the intended application
and purpose.
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