HP 85662A - Page 7

Service Sheets
The service sheets in this manual are organized in alpha-numeric order and are indexed with
tabs to make it easy to locate a specific service sheet. Each of the service sheets contain the
following information:
■ Circuit Description (where practical)
■ Troubleshooting Hints (where practical)
- Replaceable Parts Lists
■ Block Diagram (where practical)
- Component Location Illustrations
- Schematic Diagrams
Repair Procedures
Repair procedures are included for use in removing and replacing assemblies for repair. They
are located in the following sections:
■ Front-Panel LED Replacement
Tab: AlAl Keyboard
■ Front Panel Removal and Repair
Tab: AlAl Keyboard
- CRT Replacement
Tab: A1A3 High Voltage Regulator
■ IF-Display Section Internal Fuse Replacement
Tab: A1A6 ±15 V Regulator and High Voltage
Major Assembly and Component Locations
Major assembly and component location illustrations for the IF-Section are located at the rear
of this manual.
Troubleshooting
Troubleshooting information for the IF-Section is divided into two levels as follows:
- Section Level
IF Overall Block Diagrarn
Al Display Section Block Diagram
A3 Digital Storage Troubleshooting
A4 IF-Section Troubleshooting
- Assembly Level
Most assemblies have troubleshooting hints immediately following their circuit
descriptions. Troubleshooting information is also located on assembly-level block
diagrams, notes, and schematics.
2 If-Display Section General Information