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Page 176
Feb 20/2002
Matsushita Avionics Systems Corporation
COMPONENT MAINTENANCE MANUAL
PART NUMBER RD-AA5002 SERIES
23-32-47
(11) Second Type A8 Card
Refer to Figure 143 for the location of the variable resistor
A8VR501.
VR501
A8 CARD CN503
BOTTOM
TOP
FRONT REAR
LOCATION OF VARIABLE RESISTOR ON A8 CARD
Figure 143
Do the output level adjustment as follows:
(a) Set the VMU tuner for reception of CH2 and make sure that the
oscilloscope shows a video signal waveform as shown in Figure
144.
(b) Turn A8VR501 and adjust the amplitude of the video signal shown
on the oscilloscope to 0.8 Vp-p.
0.8 Vp-p
A8VR501 ADJUSTS
THIS AMPLITUDE.
ADJUSTMENT OF OUTPUT LEVEL OF INTERNAL VIDEO SIGNAL GENERATOR
Figure 144
(c) When you complete the output level adjustment, click on the
"USER CONFIG" button to put the user configuration back into the
UUT.
(d) When the user configuration is shown, click on the "END" button.
Page 301
Feb 20/2002
Panasonic Avionics Corporation
COMPONENT MAINTENANCE MANUAL
PART NUMBER RD-AA5002 SERIES
23-32-47
DISASSEMBLY
NOTE: Refer to the TESTING AND FAULT ISOLATION - PART 1 or PART 2 section to
find the condition of the unit or most possible cause of its malfunction.
This is to make sure that you will not disassemble the unit more than
necessary.
1. General
A. This section gives instructions to remove the primary assemblies
contained in the Video Modulator Unit (VMU) for maintenance.
B. Do the disassembly work in a fully de-energized condition with the test
harness removed from the J1 connector of the VMU.
C. Electrostatic discharges from your hands or tools can cause permanent
damage to most of the semiconductor devices on the printed circuit card
assemblies. Obey the general precautions given below to prevent such
damage:
· Do the disassembly and assembly work on a grounded conductive surface.
· Put on a conductive wrist-strap that is grounded.
· Touch your tool to the ground (grounded metal structure, etc.) before
you use it.
· Use a tip-grounded soldering iron.
· Put the removed printed circuit card assemblies on a grounded
conductive surface.
D. We give the IPC figure-item numbers in square brackets [ ] after the
assembly or part names. We do not give alpha-variant item numbers if
they are not shown on the IPC figures.
E. The primary assemblies in the VMU are as follows:
DESIGNATION FULL NAME QUANTITY
A1 card CPU card assembly 1
A2 card Modulator card assembly 12
A3 card RF power card assembly 1
A4 card Power card assembly 1
A5 card Mother card assembly 1
A6 card Fuse card assembly 1
A7 card Connector card assembly 1
A8 card Video signal generator card assembly 1
For the printed circuit card assemblies, we use their designations only
(A1 card, A2 card, etc.) as their names.
Page 302
Jul 20/2005
Panasonic Avionics Corporation
COMPONENT MAINTENANCE MANUAL
PART NUMBER RD-AA5002 SERIES
23-32-47
2. Tools and Materials Necessary for Disassembly
NOTE: You can use alternatives for the items given in the list. The source
is as follows:
· Panasonic for Panasonic Avionics Corporation
· C/A for available from commercial sources
· Trademarks or company names for other sources.
ITEM (SOURCE) DESCRIPTION
Standard Tools (C/A) Use them as necessary.
Contact Removal Tool
(C/A)
Use this to remove the coax contacts from the A5CN6
connector. You can get this tool from:
· Siemens.
P/N C42407-A67-A1 (70-mm long) or C42407-A67-A2 (200-
mm long).
· Hirose Electric Co., Ltd., Tokyo, Japan.
P/N PO51P-T-1 (CL350-0037-1).
Refer to the REPAIR section for other contact removal
tools.
Page 303
Feb 20/2002
Matsushita Avionics Systems Corporation
COMPONENT MAINTENANCE MANUAL
PART NUMBER RD-AA5002 SERIES
23-32-47
3. Disassembly Procedures
A. Disassembly for Fault Isolation
(1) Set the tester's POWER switch to OFF and disconnect the test harness
from the J1 connector of the UUT.
(2) Remove the 8 black screws [1-15] and remove the top cover assembly
[1-10].
(3) Remove the 4 black screws [1-40] and remove the bottom cover [1-35].
(4) This is all the disassembly that is necessary for fault isolation.
The rear side of the A5 card gives access to the A5 card connectors.
B. Removal of A1, A2, A3, and A4 Cards
You can easily remove these cards. To remove one of these cards, use the
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COMPONENT MAINTENANCE MANUAL Video Modulator Unit (VMU)(81)
