曝光臺 注意防騙 網曝天貓店富美金盛家居專營店坑蒙拐騙欺詐消費者

PART NUMBER RD-AA5002 SERIES
23-32-47
(7) Make sure that the spectrum analyzer shows 12 picture carriers from
151.25 to 283.25 MHz.
(8) Turn the variable resistor A2VR202 on each A2 card to set the level
of each picture carrier to:
UUT RF CARRIER LEVEL
RD-AA5002-12 without MOD2,
RD-AA5002-22 without MOD4,
RD-AA5002-23 without MOD3
108 dBmV ±0.5 dB
RD-AA5002-12 with MOD2,
RD-AA5002-22 with MOD4,
RD-AA5002-23 with MOD3,
RD-AA5002-25
102 dBmV ±0.5 dB
Refer to Figure 139 for the location of the variable resistor
A2VR202.
VR202 VR201
RF VIDEO
FRONT
REAR
LOCATION OF VARIABLE RESISTORS ON A2 CARD
Figure 139
(9) RF Output Connection Change for RF2 Measurements
(a) Disconnect the BNC 50-W terminator from the tester's RF OUTPUT
RF2 connector.
(b) Disconnect the RFC1 cable from the tester's RF OUTPUT RF1
connector, and connect it to the RF OUTPUT RF2 connector.
(c) Connect the BNC 50-W terminator to the tester's RF OUTPUT RF1
connector.
T&FI-2
Page 169
Feb 20/2002
Matsushita Avionics Systems Corporation
COMPONENT MAINTENANCE MANUAL
PART NUMBER RD-AA5002 SERIES
23-32-47
(10) Make sure that the level of each picture carrier is:
UUT RF CARRIER LEVEL
RD-AA5002-12 without MOD2,
RD-AA5002-22 without MOD4,
RD-AA5002-23 without MOD3
108 dBmV ±1.0 dB
RD-AA5002-12 with MOD2,
RD-AA5002-22 with MOD4,
RD-AA5002-23 with MOD3,
RD-AA5002-25
102 dBmV ±1.0 dB
(11) RF Output Connection Change for RF3 Measurements
(a) Disconnect the BNC 50-W terminator from the tester's RF OUTPUT
RF3 connector.
(b) Disconnect the RFC1 cable from the tester's RF OUTPUT RF2
connector, and connect it to the RF OUTPUT RF3 connector.
(c) Connect the BNC 50-W terminator to the tester's RF OUTPUT RF2
connector.
(12) Make sure that the level of each picture carrier is:
UUT RF CARRIER LEVEL
RD-AA5002-12 without MOD2,
RD-AA5002-22 without MOD4,
RD-AA5002-23 without MOD3
108 dBmV ±1.0 dB
RD-AA5002-12 with MOD2,
RD-AA5002-22 with MOD4,
RD-AA5002-23 with MOD3,
RD-AA5002-25
102 dBmV ±1.0 dB
(13) RF Output Connection Change for RF4 Measurements
(a) Disconnect the BNC 50-W terminator from the tester's RF OUTPUT
RF4 connector.
(b) Disconnect the RFC1 cable from the tester's RF OUTPUT RF3
connector, and connect it to the RF OUTPUT RF4 connector.
T&FI-2
Page 170
Feb 20/2002
Matsushita Avionics Systems Corporation
COMPONENT MAINTENANCE MANUAL
PART NUMBER RD-AA5002 SERIES
23-32-47
(c) Connect the BNC 50-W terminator to the tester's RF OUTPUT RF3
connector.
(14) Make sure that the level of each picture carrier is:
UUT RF CARRIER LEVEL
RD-AA5002-12 without MOD2,
RD-AA5002-22 without MOD4,
RD-AA5002-23 without MOD3
108 dBmV ±1.0 dB
RD-AA5002-12 with MOD2,
RD-AA5002-22 with MOD4,
RD-AA5002-23 with MOD3,
RD-AA5002-25
102 dBmV ±1.0 dB
(15) Click on the "USER CONFIG" button to put the user configuration back
into the UUT.
(16) When the user configuration is shown, click on the "END" button.
T&FI-2
Page 171
Aug 20/2002
Matsushita Avionics Systems Corporation
COMPONENT MAINTENANCE MANUAL
PART NUMBER RD-AA5002 SERIES
23-32-47
C. Modulation Depth
This paragraph gives the procedure to adjust the modulation depth of one
modulator channel of the UUT and uses the term "CHn", which can be one of
the UUT's modulator channels CH1 thru CH12.
(1) Use the same setup as the functional test setup (Figure 111).
(2) RF Output Connections
(a) Connect the input of the VMU tuner to the tester's RF OUTPUT RF1
connector with two RF cables (RFC2 and RFC3) and a 20-dB RF
attenuator.
(b) Connect BNC 50-W terminators to the RF OUTPUT RF2, RF3 and RF4
connectors of the tester.
(3) Set the impedance selector switch on the impedance selector to:
UUT CHANNEL IMPEDANCE SELECTOR
RD-AA5002-12,
RD-AA5002-22
CH1 thru CH12 50W
CH1 thru CH11 50W
RD-AA5002-23
CH12 100W
CH1 thru CH6 50W
RD-AA5002-25
CH7 thru CH12 100W
(4) Connect the BNC tee adapter T1 from the impedance selector to the
tester's VIDEO INPUT CHn connector.
(5) Start the adjustment mode (ref. 5.B.).
(6) The user configuration is initially shown. If the frequencies are
not in the range from 151.25 to 283.25 MHz at intervals of 12 MHz,
click on the "FACTORY SETTING" button to set this frequency range.
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：COMPONENT MAINTENANCE MANUAL Video Modulator Unit (VMU)(79)