Agilent Technologies 5071A manual 48V Subpanel Assembly, Input Chassis Ground

Page 41

Assembly-Level Service

Theory of Operation

Option 048: The slot/module interconnect diagram on page 3-28 is changed:

The J3 Low Current Steering Logic connector does not have +5 VDC, POWER FAIL, or BAT VALID signals present.

48V Subpanel Assembly

The schematic diagram in figure 2-1 below illustrates the wiring of the 48V Subpanel Assembly. This assembly steers dc input power, and provides fuse protection for the external 48V external dc input power. The output of this circuit at P1 is routed to the input of the External DC Input Filter Block (J1) illustrated at the top-left comer of figure 3-3. in the 5071A Assembly-Level Service manual.

+

Input 2

-

Chassis

Ground

+

Input 1

-

CR1	MP3
	Rear Panel	P1
	DC Fuse Holder	P1
	F2 2.5A DC Fuse
	+
CR2	Red	Red
Grn/Yel	Grn/Yel	To A1
		To A1
	Blk
	-
	MP2	MP3
CR3	3 Position Solder	MP3
	Terminal strip	Solder Lug

CR4

MP1

Rear Panel

DC Power

5 Position screw Terminal strip

Figure 2-1. DC Input 1 and 2 Power Steering Schematic (48V Subpanel Assembly, part number 05071-60277)

2-17

Image 41

Contents 7HOHFRPPXQLFDWLRQV2SWLRQV Page Telecommunications Options Supplemental Manual Before Cleaning Manual Updating Changes 05071-90042, December Contents Service Available Accessories and Options Supplemental CharacteristicsContents Instrument Identification How to Use This ManualManual Organization How to Order ManualsInstruments Covered by This manual Operating and Programming Introduction 5071A Major FeaturesIntroducing the 5071A Operating The 5071AGetting Started Connectors5071A at a Glance Rear-Panel Connections5071A Rear Panel Connections Fuse Starting The 5071A Powering Down the 5071APerforming Basic Tasks Synchronizing to an External 1 PPS ReferenceMonitoring Status Using the 5071ADisabling the Internal -Standby Battery Rear-Panel Output Connectors Front-Panel Indicators and MessagesCase of Difficulty Restarting the 5071A5071A Command Summary 5071A Command ReferencesScpi Subsystem Commands Scpi CommandsSpecifications Power Requirements InstallationOperating the 5071A From External Dc Power Preparation for UseReplacing the External Dc Input Power Fuse Internal Standby Battery MaintenanceLong-Term Storage Preparing the RP 5071-A For External-Dc OperationAssembly-Level Service 5071A Operational Verification Rear-Panel Output Signal ChecksPerformance Tests Option ServiceAssembly Identification and Location First Power On Top-Level Diagnostic Tree OrganizationTop-Level Diagnostic Tree Diagnostic Section Warm-up and Fatal Error Diagnostic Tree Advisory Messages Subsection Power-Supply Diagnostic Tree4.0.0 Ext. Dc Input Fuse Fault Ac-Line Fuse Fault Isolation r/o LF1/T1No Operation From Internal Standby Battery Internal-Battery Charger TestA8 Diagnostic Tree A/M Subsection 3 1 PPS Outputs Test Assembly/Module Diagnostic Trees Diagnostic Section4 A8 Front/Rear-Panel Sync Input Test 5 A8-to-Chassis Interconnect Test4.1 A9-to-Chassis TCO Option signal Interconnect Test A9 Diagnostic Tree A/M Subsection 5.0 A9 Mon Signal Test6.0 A9 J4 80-MHz Signal Test Introduction Theory of OperationSimplified Functional Description A1 Motherboard Circuit DescriptionInput/Output Block Power Supply BlockFunctional Block Descriptions Instrument Control Block Operating Firmware Warning ModeReference Oscillator/RF-Chain Block Interconnections Power Supply Block External Dc Input Circuit A1 Motherboard Circuit DescriptionOvervoltage Protection Circuit A1 Power Supply/Distribution Schematic Diagram A11 Power Steering Logic AssemblyInput Chassis Ground 48V Subpanel AssemblyA1 Power-Supply Block Diagram B1 Internal-Standby BatteryExchange Assemblies Replaceable PartsReplaceable Parts Backdating Backdating Specifications Internal Standby Battery Nominal Values Supplemental CharacteristicsTime Standard EnvironmentalAccessories Furnished Dc input connector WeightOptions Available Accessories and OptionsService and Support From front matter Declaration of Conformity Page Page Manual Part Number