Infinity Beta SW Series Service Manual page 11

CSW-10
TESTING
7) Set the amplifier controls as follows:
a. Gain control to full CCW (MIN)
b. Crossover control to full CW (150)
c. Phase switch to 0
d. LFE/Normal switch to Normal
e. RABOS Switch to OFF
f. AC Power switch to OFF
8) Connect the amplifier to an 8 ohm resistive load (250W minimum)
9) Connect a Sine wave signal: 50Hz, 0.250VRMS signal to the amplifier Left or Right input.
10) Connect an oscilliscope to both terminals of the load resistor. IMPORTANT: Make sure that the scope is floating
or isolated; (this amplifier is configured in BRIDGE mode and a Ground connection to any of its terminals could
cause a malfunction).
11) Connect the unit to a 120V source (or 230V for 230 models); Turn ON AC Main power switch.
12) Increase the gain control to MAX for few seconds and verify the signal on the scope; clipping must be
symmetrical and should extend to the 60V area (positive & negative peaks). Refer to the sample graph.
13) Reduce the Gain to minimum; turn AC mains switch to OFF and disconnect the unit from the AC source.
14) Re-install the amplifier assembly into the cabinet.
FINAL TEST
15) Connect the unit to a 120V source (or 230V for 230 models); Turn ON AC Main power switch.
16) Connect a Sine wave signal: 50Hz, 0.100VRMS signal to the amplifier Left or Right input.
17) Increase gain control to MAX and make sure that unit produces sound, make sure that there is no evidence of
air leaks or any other objectionable sound by moving the gain control up and down.
18) Turn OFF AC Main power switch, disconnect the unit from the AC source and reset the Gain control to
minimum.
Model
CSW-10
Missing All Indicators Described Below
Modified CSW-10 subwoofers will have one or more
of the following indicators:
1) Blue mark on the serial number (amp faceplate)
2) Silver/light marker on rear of plastic amp cover
3) "QC" stamp on outer carton near bar code label.
CSW-10
4) Serial Number starts with prefix:
HA0234, HA0235, or HA0236.
5) Serial Numbers:
HA0217-05000 and above
HA0226-05000 and above
IDENTIFICATION STATUS
Premature Limiting When
Driven At High Levels
Modified by Factory
10
ACTION
Add two RLS4148 SMD
Diodes in location D90 & D91
None Required