Table of Contents
1. Service Overview
1-1. Location of Printed Wiring Boards............................................................................................1-1
1-2. Functions of Onboard Switches and LED Indicators......................................................................... 1-2
1-2-1. MB-1257 Board........................................................................................................ 1-2
1-2-2. NET-37 Board.......................................................................................................... 1-2
1-2-3. SY-467 Board...........................................................................................................1-4
1-2-4. TX-167A Board........................................................................................................ 1-5
1-2-5. TX-167B Board.........................................................................................................1-5
1-2-6. VIF-75 Board...........................................................................................................1-6
1-2-7. ENC-185 Board.........................................................................................................1-7
1-2-8. MDC-23 Board......................................................................................................... 1-8
1-3. Notes on Replacement of Circuit Board...................................................................................... 1-9
1-3-1. AT-195 Board, VIF-75 Board and Power Unit (RE-345 Board)....................................................... 1-9
1-4. Cautions when Replacing the Lithium Battery.............................................................................. 1-10
1-4-1. Replacing Procedure.................................................................................................. 1-10
1-5. Cleaning of Connector/Cable................................................................................................ 1-11
1-5-1. When the Optical Connector Cleaner (Commercially Available) is Available....................................... 1-11
1-5-2. When the Optical Connector Cleaner (Commercially Available) is not Available (Connectors/Cables of LEMO) ...1-12
1-5-3. When the Optical Connector Cleaner (Commercially Available) is not Available (Connector of Tajimi
Electronics Co., Ltd./Cable)...........................................................................................1-13
1-5-4. When the Optical Connector Cleaner (Commercially Available) is not Available (Connector)......................1-15
1-6. Service Tools/Measuring Equipment List................................................................................... 1-16
1-6-1. Service Fixtures....................................................................................................... 1-16
1-7. PLD.......................................................................................................................... 1-17
1-7-1. Corresponding PLDs..................................................................................................1-17
1-7-2. Upgrading PLD Data..................................................................................................1-17
1-8. Flexible Flat Cable and Coaxial Cable.......................................................................................1-19
1-8-1. Disconnecting and Connecting Flexible Flat Cable...................................................................1-19
1-8-2. Disconnecting/Connecting Fine-Wire Coaxial Cable.................................................................1-20
1-9. Circuit Protective Devices................................................................................................... 1-24
1-9-1. Fuse....................................................................................................................1-24
1-9-2. Circuit Protection Element............................................................................................1-24
1-10. Lead-free Solder............................................................................................................. 1-25
2. Replacement of Main Parts
2-1. Notes on Replacing the Parts..................................................................................................2-1
2-2. Top Cover..................................................................................................................... 2-2
2-3. Front Panel.................................................................................................................... 2-3
2-3-1. Front Panel Assembly.................................................................................................. 2-3
2-3-2. FP-305 Board...........................................................................................................2-4
2-3-3. CN-4056 Board.........................................................................................................2-5
2-3-4. LE-425 Board...........................................................................................................2-6
2-3-5. LE-429 Board...........................................................................................................2-7
2-3-6. LE-427 Board...........................................................................................................2-8
2-4. Optical Multi Fiber Cable.....................................................................................................2-9
2-4-1. LEMO Connector Assembly........................................................................................... 2-9
2-4-2. TAJIMI Connector Assembly......................................................................................... 2-11
2-5. Top Chassis/Air Distributor Assembly ......................................................................................2-12
HDCU3500/HDCU5500
1