DA824
31
Slot power supply peripheral connection check
Only the NG systems from the test results will be shown on the screen.
[5] WC BNC
Displayed on the screen when the results of the word clock IN terminal/ JK901 and CPU connection are NG.
4.
Manual inspections
In addition to the automatic tests, the residual noise is measured.
1. Measurement conditions
· 0 dBu=0.775 Vrms
· The input Impedances of the oscilloscope and the level meter should be more than 100 k ohms.
· The measurement is corrected by 12.7 kHz, -6 dB/OCT LPF.
· The load for output 1 to 8 is 600 ohms.
· Output 1 to 8 is measured at the cannon connector.
· The internal gain SW is +18 dB.
· Word clock in 75 ohms is set to on.
· Input the signal only into the channel being measured.
2. Measuring method
In the test program mode, a digital 0 will be output from the slot test jig when the following command is executed.
In this state, a level gauge is used to measure residual noise. Check that the permissible range is less than -92 dBu.
5.
System reset
When in the test program mode, entering “reset” and executing the program will reset the system.
DA824_DIAG>zero
DA824_DIAG>
DA824_DIAG>reset
The system is reset.
Summary of Contents for DA824
Page 21: ...E E 3NA V485480 1 DA824 21 MAIN Circuit Board ...
Page 22: ...E E MAIN MYSL 3NA V485480 1 MYSL Circuit Board Pattern side Pattern side DA824 22 ...
Page 25: ...3NA V485470 1 G G DA Circuit Board DA824 25 ...
Page 26: ...DA JK 3NA V485470 1 G G JK Circuit Board Pattern side Pattern side DA824 26 ...
