曝光台 注意防骗
网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者
switch on the impedance selector to 100W when you examine the
modulator channel(s) given below:
UUT PART NUMBER MODULATOR CHANNEL(S)
RD-AA5002-23 CH12
RD-AA5002-25 CH7 thru CH12
(12) Make sure that you put in the "PASS" or "FAIL" results correctly for
all channels, then click on the "NEXT" button.
T&FI-2
Page 135
Feb 20/2002
Matsushita Avionics Systems Corporation
COMPONENT MAINTENANCE MANUAL
PART NUMBER RD-AA5002 SERIES
23-32-47
E. BITE Function Check
You will hear a "click" (sound of the UUT's relay), then see the "BITE
CHECK" window as shown in Figure 127.
NOTE: If you click on the "BACK" button, you can go back to the "VIDEO
QUALITY CHECK" window.
"BITE FUNCTION CHECK" WINDOW
Figure 127
Do as follows:
(1) Remove the VC4 cable from the BNC tee adapter T1.
(2) Connect the VC4 cable to the BNC tee adapter T2 to measure the video
output of the VMU tuner on the oscilloscope.
(3) Set the VMU tuner for reception of CH2. You will see a white raster
on the video monitor.
(4) Measure the video output level of the VMU tuner on the oscilloscope
and put in the result as follows:
VIDEO OUTPUT LEVEL, VO U T CLICK ON:
0.75 Vp-p £ VO U T £ 0.95 Vp-p "PASS"
VO U T < 0.75 Vp-p or VO U T > 0.95 Vp-p "FAIL"
(5) Click on the "NEXT" button.
T&FI-2
Page 136
Feb 20/2002
Matsushita Avionics Systems Corporation
COMPONENT MAINTENANCE MANUAL
PART NUMBER RD-AA5002 SERIES
23-32-47
F. Channel 1 Input Selection Check
You will hear two "clicks" (sound from the UUT's relays), then see the
"CH1 INPUT SELECTION CHECK" window as shown in Figure 128.
NOTE: If you click on the "BACK" button, you can go back to the "BITE
FUNCTION CHECK" window.
"CH1 INPUT SELECTION CHECK" WINDOW
Figure 128
Do as follows:
(1) Make sure that the impedance selector switch is set to 50W.
(2) Connect the BNC tee adapter T1 to the tester's VIDEO INPUT TEST
connector.
(3) Set the video pattern generator for a white-raster output.
(4) Remove the VC4 cable from the BNC tee adapter T2.
(5) Connect the VC4 cable to the BNC tee adapter T1 to measure the
output of the video pattern generator on the oscilloscope.
(6) Adjust the output of the video pattern generator accurately to 1.0
Vp-p in amplitude as measured on the oscilloscope.
(7) Remove the VC4 cable from the BNC tee adapter T1.
(8) Connect the VC4 cable to the BNC tee adapter T2 to measure the video
output of the VMU tuner on the oscilloscope.
T&FI-2
Page 137
Feb 20/2002
Matsushita Avionics Systems Corporation
COMPONENT MAINTENANCE MANUAL
PART NUMBER RD-AA5002 SERIES
23-32-47
(9) Set the VMU tuner for reception of CH1. You will see a white raster
on the video monitor.
(10) Measure the video output level of the VMU tuner on the oscilloscope
and put in the result as follows:
VIDEO OUTPUT LEVEL, VO U T CLICK ON:
0.9 Vp-p £ VO U T £ 1.1 Vp-p "PASS"
VO U T < 0.9 Vp-p or VO U T > 1.1 Vp-p "FAIL"
(11) Click on the "NEXT" button. You will see the "USER CONFIGURATION"
window as shown in Figure 129. This window is the same as the one
shown in Figure 118 unless you stopped the tester program during the
testing.
"USER CONFIGURATION" WINDOW
Figure 129
T&FI-2
Page 138
Feb 20/2002
Matsushita Avionics Systems Corporation
COMPONENT MAINTENANCE MANUAL
PART NUMBER RD-AA5002 SERIES
23-32-47
(12) If you see the "ERROR" box as shown in Figure 130, go to step (13).
If you do not see the "ERROR" box, go to "G. End of Functional
Testing".
"ERROR" BOX
Figure 130
(13) The "ERROR" box (Figure 130) will show if there occurs a temporary
interruption of data communication during the restoration of the
user configuration. The "COMMUNICATION ERROR" box (Figure 17) will
show if the data communication is fully stopped.
If you see the "ERROR" box as shown in Figure 130, do as follows:
(a) Click on the "RETRY" box to let the tester program put the user
configuration back on the UUT.
(b) If you see the "ERROR" box again, click on the "RETRY" button
again.
(c) If the "ERROR" box shows again after you clicked on the "RETRY"
button five times, click on the "ABORT" button. This sets the
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：
COMPONENT MAINTENANCE MANUAL Video Modulator Unit (VMU)(70)
