Test Set Up And Procedure - Infinity INTERMEZZO 3.5c Service Manual

INTERMEZZO 3.5c
SIGNAL
GENERATOR
AMPLIFIER
SYSTEM AURAL SWEEP TEST
Equipment needed:
Function/signal generator/sweep generator
Integrated Amplifier
Multimeter
Speaker cables
General Unit Function (UUT = Unit Under Test)
1. Remove the loudspeaker grille.
2. Depress the "High-Pass Filter" button on the rear faceplate; switch the TV control to None.
3. Connect one pair of speaker cables to the input terminals on UUT. Cables should be
connected to an integrated amplifier fed by the signal generator.
4. Turn on signal generator and adjust so that speaker level output at the amplifier is 7.0V, 80 Hz.
5. Plug in AC power cord and turn on UUT with the power switch; LED on the Level control
should light - Red initially and Green after step #6 is followed.
6. Turn up the level control on the front of the UUT to "10". (Maximum). Woofers should be
driving close to maximum excursion at this point.
Sweep Function
1. Follow steps 1-6 above, using a sweep generator as a signal source.
2. Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks,
buzzes or any other noises. If any unusual noises are heard, remove woofers and test.
Driver Function
1. Remove woofers from cabinet; (See Page 9), detach + and - wire clips.
2. Check DC resistance of woofer; each driver should be 7.7 ohms ±10%
3. Connect a pair of speaker cables to driver terminals. Cables should be connected to an
integrated amplifier fed by a signal generator. Turn on generator and adjust so that speaker
level output is 5.0V.
4. Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other
unusual noises.

Test Set Up and Procedure

AC VOLT
METER (10V)
INTERMEZZ0 3.5c
UNDER TEST
SPEAKER
OUTPUT
FROM
AMPLIFIER
8