iv
6.3.1
Reset circuit ............................................................................................................................................. 6-3
6.3.2
Address decoding ..................................................................................................................................... 6-3
6.3.3
Memory .................................................................................................................................................... 6-3
6.4
Relay control circuitry ....................................................................................................................................... 6-4
6.4.1
Switching card interface .......................................................................................................................... 6-4
6.4.2
Switching card logic ................................................................................................................................ 6-6
6.5
Display circuitry ................................................................................................................................................ 6-8
6.5.1
Display data ........................................................................................................................................... 6-11
6.5.2
Front panel keys ..................................................................................................................................... 6-11
6.5.3
Display interface .................................................................................................................................... 6-11
6.5.4
Refresh display/read keyboard .............................................................................................................. 6-11
6.6
Light pen interface ........................................................................................................................................... 6-12
6.7
Master/slave circuitry ...................................................................................................................................... 6-13
6.7.1
Serial communication ............................................................................................................................ 6-13
6.7.2
Control signals ....................................................................................................................................... 6-14
6.8
Digital I/O ........................................................................................................................................................ 6-14
6.9
IEEE-488 bus interface .................................................................................................................................... 6-14
6.10
Power supplies ................................................................................................................................................. 6-14
7
Maintenance
7.1
Introduction ........................................................................................................................................................ 7-1
7.2
Fixed rack installation ........................................................................................................................................ 7-1
7.3
Cover removal ................................................................................................................................................... 7-4
7.4
Fuse/power supply replacement ........................................................................................................................ 7-4
7.5
Battery replacement ........................................................................................................................................... 7-5
7.6
Digital I/O power selection (jumper W101) ...................................................................................................... 7-6
7.7
Disassembly ....................................................................................................................................................... 7-7
7.8
Static sensitive devices ...................................................................................................................................... 7-7
7.9
Switching system troubleshooting ..................................................................................................................... 7-8
7.9.1
Recommended test equipment ................................................................................................................. 7-8
7.9.2
Power-up self-test .................................................................................................................................... 7-8
7.9.3
Power supply checks ................................................................................................................................ 7-9
7.9.4
Mother board checks ................................................................................................................................ 7-9
7.9.5
Display checks ....................................................................................................................................... 7-13
7.9.6
Using an extender card .......................................................................................................................... 7-13
7.10
Handling and cleaning ..................................................................................................................................... 7-13
8
Replaceable Parts
8.1
Introduction ........................................................................................................................................................ 8-1
8.2
Parts lists ............................................................................................................................................................ 8-1
8.3
Ordering information ......................................................................................................................................... 8-1
8.4
Factory service ................................................................................................................................................... 8-1
8.5
Component layouts and schematics ................................................................................................................... 8-1
A
Card Configuration Worksheet
B
I/O Connections
B.1
Typical output connection schemes ................................................................................................................... B-1
B.2
Typical input connection scheme ...................................................................................................................... B-2
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Summary of Contents for 708A
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