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6-4
2715 Spectrum Analyzer Service Manual
The Main Extender is to be used with all circuit boards that use the 50 conductor
microprocessor bus cable. The Secondary Extender card is added to the Main
Extender for use with the Log and Phase Lock CFC boards. See Figure 6--1.
Circuit Board Lifter
Square Pins
Small Extender Card Used
with Log Amplifier and Center
Frequency Control Boards
Figure 6- 1: Main Extender and Secondary Extender
On the Main Extender, signal lines and power supply lines from the bottom edge
connector to the pins at the top edge of the Extender are completed by a set of
two pin jumpers (excluding two ground lines and the 50 conductor microproces-
sor bus cable). Thus, except for the two ground lines, all signal and power supply
lines are interruptible via these two pin jumpers.
Signal lines are brought to square pins where they can be steered to one of two
BNC connectors on the Main Extender. See Figure 6--2. There are 20 rows of
3 pin sets numbered 1 through 12 and 17 through 24. The numbers correspond to
pin numbers of the interconnect system on the Power Supply board. Placing a
jumper at position A in Figure 6--2 steers the selected signal to BNC connec-
tor A, and a jumper at position B steers the signal to connector B. Consequently,
a maximum of two signals may be steered to the BNC connectors at any one
time.