Service manual
Test Setup
Input Connections: Connect an oscillator to the
positive (+) and negative (-) input terminals for
Channels 1 or 2. These procedures assume that
the person performing these tests is using test
equipment with unbalanced inputs and outputs.
See Figure 16 for connection information. Also,
refer to Figure 15 for a system hookup diagram.
Output Connections: Connect test equipment to
the positive (+) and negative (-) output terminals
for Channels 1 or 2 (low and high frequency
outputs).
All tests should be performed for both
channels.
All test equipment must be isolated from
ground (floated).
See Figure 17 for a picture of the controller's
back panel.
The controls on the back panel should be set as
follows:
• Mode switch should be set at 4 (Option)
12
OC-1 Test Procedures
• Output mode switch should be set at
normal
• Input switches should be set at +4 dB
• Low frequency level potentiometer should
be set at 0 dB
**IMPORTANT NOTE**
Install the external protection circuit harness for all
tests. Otherwise, the controller's bass channel (as a
safety measure) will shut down.
1. Frequency Response of High Frequency (HF)
Output
A. Apply a 100 mVrms, 600 Hz signal to the
controllers's input terminals and reference your
dB meter to this frequency.
B. Measure the frequency response across the
HF outputs according to the chart below. This
chart provides responses for the 402, 502, and
802 II controllers (with the option card installed).
Frequency (Hz) 402™ Controller
Response (dB)
502™ Controller
Response (dB)
802
®
II Controller
Response (dB)
40 -29.2 ± 1.5 dB -23.5 ± 1.5 dB -17.57 ± 1.5 dB
80 -8.3 ± 1.5 dB - 5.6 ± 1.5 dB -1.84 ± 1.5 dB
100 -3.0 ± 1.5 dB +0.8 ± 1 .5 dB +2.0 ± 1.5 dB
120 0 dB +1.6 ± 1 .5 dB +4.0 ± 1.5 dB
150 +1.83 ± 1.5 dB +1.93 ± 1.5 dB +4.7 ± 1.5 dB
180 +2.16 ± 1.5 dB +0.7 ± 1.5 dB +4.2 ± 1.5 dB
200 +2.11 ± 1.5 dB +.15 ± 1.5 dB +3.7 ± 1.5 dB
600 REF REF REF
2200 +2.12 ± 1.5 dB +3.5 ± 1.5 dB +1.61 ± 1.5 dB
5000 +7.5 ± 1.5 dB +12.5 ± 1.5 dB +7.29 ± 1.5 dB
15000 +12.85 ± 1.5 dB +19.0 ± 1.5 dB +17.02 ± 1.5 dB