Qc Test Procedure - Alesis ADAT BRC Service Manual

Test No. Test Name
7 48 KHz In/Out
8 Video Input
9 SMPTE In/Out Tests BRC SMPTE functionality. To conduct this test, the operator must

4.3 QC Test Procedure

Appendix E contains the test procedure which must be performed on every BRC serviced in the
field. This test allows the service technician to verify that the unit is working to the highest level of
quality. The test includes a check of the sync interface to the ADAT, as well as all of the major
functions of the BRC. This test procedure should be conducted only after all repairs on the unit have
been completed.
The QC Test Procedure is written in a step by step, comprehensive manner. It should be
conducted in the order written. All test equipment requirements, hook up and settings are described in
the text. If there are no severe difficulties with the BRC, then this test should take the service technician
approximately 15 to complete. If problems occur with the unit during the conduct of this test, please
consult section 3 of this service manual for assistance in resolving said problems.
TABLE 4.1 - BRC SELF TESTS (Cont'd)
Tests BRC 48 KHz functionality. To conduct this test, the operator must
connect a BNC cable from the 48 KHZ input jack to the 48 KHZ output
jack on the back of the BRC. During this test, the BRC will send a 48 KHZ
signal from the 48 KHZ output jack while checking for a 48 KHZ signal on
the 48 KHZ input jack. If the unit passes this test, the LCD will display
PASSED and the BRC will exit this test automatically. However, if the
unit fails this test, the LCD will display FAILED and the operator will
have to press PITCH
Tests BRC Video Input Port. To conduct this test, the operator must
connect a VCR to the BRC via the VIDEO SYNC IN jack on the back of
the BRC. During this test, the BRC is checking for the presence of a video
signal on the VIDEO SYNC IN jack. Some VCRs constantly output a
video signal. However, if this is not the case with the VCR being used
during this test, simply insert a tape with a video signal into the VCR and
press PLAY. Depending on the type of video signal present, the LCD will
display the appropriate message. For NTSC video signals, the LCD
displays NTSC Input. For PAL or SECAM video signals, the LCD will
display PAL/SECAM input. To exit this test at any time, press PITCH
and PITCH simultaneously.
connect a 1/4 inch cable from the SMPTE input jack to the SMPTE output
jack on the back of the BRC. During this test, the BRC will send SMPTE
time code from the SMPTE output jack while checking for SMPTE time
code on the SMPTE input jack. If the LED display is counting time code,
the BRC passes this test. However, if no time code is displayed, the BRC
fails this test. To exit this test at any time, press PITCH
simultaneously.
17
Description of Test
and PITCH simultaneously to exit this test.
and PITCH