AM 320-01-808
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Ill. SCHEMATIC DIAGRAMS
In this chapter you will find detailed schematic diagrams,
principles of operation and useful tips for everyday
practice. In order to give you a better overview, we divided
the schematic diagrams into 3 groups as follows:
A Central Electronics
B. Control Panels
C. Peripheral Boards
A. Central Electronics
In this section you will find the pin assignment and the
circuitry of the backplane board MB4O and the sche-
matic diagrams of all plug-in boards.
1. MB4O (Backplane PC Board)
This PC board has three basic functions:
- it is the mechanical support for all plug-in boards,
- it connects the boards electrically,
- it carries all connectors for connecting the periph-
eral modules via ribbon cables.
The following figures show the edge connector pin layouts,
the male connector pin layouts and the circuitry on the MB
40.
Tip:
For testing or troubleshooting a plug-in board,
pull out the desired card from the card rack,
insert the extender card EXT 1 0 (= testing
adapter) into the slot of the plug-in board and
plug the board to be tested into the EXT 10.
Via the solder pins on the EXT 10 all connec-
tions are led to the outside and now you may
test the accessible components.
Except for the eight slave boards (5L5) and the
two WERSIVOICE plug-in boards (WV30),
which can be interchanged in their designated
slots, no plug-in board must ever be plugged
into any slot other than that designated for it.
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