Electro voice interface a service manual
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Page 1
Warranty
lnterfa:e:A is guaranteed agains: wallun .lon due :0
defects m workmanshlp and malerrals r. such 'ral-
function occurs, InterfacetA wrlr be renamed or reolaced
(at our option) as follows:
Speaker systems will be reparreo or laced wrmoul
charge for Dans or labor for a :erloc 0. Me years frcm
the Care of orlglnal purchaser
Equalizer mll be repaired or replaceu w
parts for a cenod of three years "or". CJKE- of or
Interface: A
» .::r,=..:,
Vi:
CL u: Charge for labor for a warned of
cne year from daze of ergmal purchase,
All unrrs must be demered prepaid (D the proper
p
ctrorVoice
prepdld. Warr
vlems or mallu
an we: r
.lCe faulllv and will be relurneu
y does not :over fmrsn or apnearance
5an due- in abuse or oneration 2r other
-.OndlIl-:ns. Rena bv other man
ElECUO'VOICE _r us aurno'rzed :ervrce agenmes will vald
{hrs guarantee
Page 2
.Speaker System Testing
Remove the grille and retainer board for these tests.
1.
RUB AND BUZZ AND OPERATIONAL CHECKS
Apply 4 volts to the system at 1000 Hz. and then
sweep the system from 20 to 20.000 Hz. Make sure
the system IS tree from buzzes, rattles, rubbing
noises, etc. Verify that both the 8-Inch woofer and
front tweeter are operational by listening close to
the individual components while sweeping.
(Crossover frequency between these components is
1,500 Hz.) Verify the operation of the rear tweeter
by listening close with the oscillator set between
8.000 and 10.000 Hz.
ENCLOSURE "TUNING" AND AIR LEAKS
When the system is operating properly, the
excursion of the 8-inch woofer will drop near the
system tuning frequency, normally between 30 and
34 Hz. Below the null frequency. the 8-inch excur»
sion will increase again. While carei'ully adjusting
the oscillator frequency. look for this reduction in
cone motion on the 8-inch woofer.
Once the tuning frequency is found. leave the
oscillator set at this frequency and increase the
input voltage to 10 volts. Listen for any air leaks
from the various openings of the enclosure that can
be heard at a distance of about 1 foot. Seal any
such leaks found. (lr IS sometimes easier to find the
exact location of a leak when listening through a
small tube of NZ to 1 inch diameter and a foot or
two long.)
CABINET APPEARANCE
Visually inspect the cabinet for scratches or un-
sightly details and repair where possible.
WHEN TESTING IS COMPLETED. RE-INSTALL
THE RETAINER BOARD ON THE' LOW
FREQUENCY RADIATOR TO AVOID SHIPPING
DAMAGE.
Fla-pack the system neatly in the carton. Make sure
a poly bag is used to protect the walnut finish and
grille cloth.
EkflATUM: On page I. under equalizer specifications, maximum boost is 6 dB at 35 Hz.