Manuals / Dynacord / Home Audio / Stereo Amplifier

Dynacord DPA 4120, DPA 4140 owner manual Checking the pilot tone surveillance function

Models: DPA 4120 DPA 4140

1 72
Download 72 pages 6.17 Kb
Page 37
Image 37
Checking the pilot tone surveillance function:

NRS 90 224

S406 S 405

B 411

figure 9 printed board assembly 84175 in the DPA 4140 showing the NRS 90224 pilot tone & ground fault surveillance and the bridges B411 and S405, S406 for switching the output voltage; inserted

Checking the pilot tone surveillance function:

When the NRS 90224 is installed and the power amplifier is switched on, the green READY indicator (7) has to light. The testing and reset button TEST (3) serves as a function control for the pilot tone surveillance. With the TEST button being engaged, the 19 kHz generator is inactive. The green READY indicator is off and the READY fault message relay drops. Approximately 3 seconds after releasing the TEST button, the indicator has to light again. This method can also be used to check system configurations with average-switching.

37

Page 36 Page 38
Page 37
Image 37
Dynacord DPA 4120, DPA 4140 owner manual Checking the pilot tone surveillance function
Page 36 Page 38