LORAD AFFINITY Series - Troubleshooting; Theory of Operation Overview

5-2 P/N 9-500-0255
Service Manual
Chapter 5: Maintenance—General
Troubleshooting
Table 5-1: Affinity Recommended Preventive Maintenance Procedures
3.0 Troubleshooting
This section provides an overview of system theory of operation and the system Alert Codes.
The theory of operation and Alert Codes can be used in conjunction with the Test Point and
LED Indicators Reference Tables found in Appendix B and the Schematic Package (PN 9-
500-0269) for troubleshooting the Affinity.
3.1 Theory of Operation Overview
This section provides a top level description of system and sub-system operation within the
Affinity to aid the Service Engineer in maintaining the unit. For detailed information on
signals within the Affinity Series System, refer to the Schematics Package.
The L
ORAD Affinity, is a multi-processor, menu-driven mammography system which consists
of the following sub-systems:
• Operator Control
• Power Distribution
• System Control
• Tubehead Functions
• X-ray Tube Control
• Mechanical Functions
• Exposure Control
• Automatic Exposure Control
3.1.1 Operator Control Panel
The Operator Control Panel, is a microprocessor based unit that communicates bi-
directionally with the Host Microprocessor Board via RS-422 differential I/O (Input/
Frequency PM Refer to
D; AR Pre-Power Up Checks Chapter 3, Section 2.1
D; AR Post Power Up Checks Chapter 3, Section 2.3
S C-arm Safety Function Check Chapter 4,
AR C-arm Safety Microprocessor
Board Calibration
Chapter 4, Section 8.4
S Tube Voltage Calibration Chapter 4, Section 4.1
S Filament Current Calibration Chapter 4, Section 4.3
S Automatic Exposure Control Sys-
tem Calibration
Chapter 4, Section 5.0
S Compression System Calibration Chapter 4, Section 3.0
S X-ray System Performance
Checks
Chapter 4, Section 4.0
S System Level Performance
Checks
Chapter 4, Section 6.0
A X-ray Field Alignment Check Chapter 4, Section 7.0
A Light Field Alignment Check Chapter 4, Section 7.10