Product Test List - Bowers & Wilkins 704 S2 Series Service – Technical Manual

13. Product Test List

Passive Loudspeakers
•
Sweep Frequency Test
20 Hz – 20 kHz (3 volts, all products) check for distortion & balance between left & right speaker
•
Spot Frequency Test
4 volts – Book shelf
5 volts – Floor standing
6 volts – Headed (800 series)
a) Between 20 – 50 Hz, check for air leaks around all joints & fixtures.
b) At 30 Hz, check for internal leaking into midrange cavity (check Mid-range driver is not
moving)
c) Between 20 – 500 Hz, check for rattles, buzzing & any other unwanted noise.
d) Check for correct phase of all drive units.
e) For Dipole, check functionally of dipole switching at 200 Hz
Headphones
•
Listen for unwanted noise between 20 Hz – 20 kHz (using hygienic ear cup)
Active devices – Subwoofers & Docking stations etc.
•
Set product to half volume & follow procedure as per above instructions, from (a) to (d)
•
Check functionality of the following:
a) Ethernet, Auxiliary, USB, Component & Headphone Output
b) Silent audio track, check for hum at 1 Meter
c) Flash test ALL mains power supply units
d) Soak test for 1 week with audio signal all units returned more than once.
e) Check functionality of GUI as per user manual
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