ZETRON 2000 Series Especificaciones descargar pdf (Pagina 81)

Adjustment Procedures

Dual Trunk Revision F (and later) Test Points and Kill Jumpers

Figure 13: Dual Trunk Card Front Panel Test Points

• To stop the AGC on trunk A from functioning, jumper from KILL A1 to KILL A2.

• To stop the AGC on trunk B from functioning, jumper from KILL B1 to KILL B2.

• To store the jumper, jumper from STORE to KILL B2, or from STORE to GND. Do

not operate the trunk cards for normal traffic with the jumper in any but the storage

position.

The right column of pins is the same as the single column of pins in pre-Rev. F trunks.

Dual Trunk Monitor Card

A convenient way to temporarily disable the AGC for the trunk being worked on is by

installing the Model 2540 Trunk Card Monitoring Board (702-9598) and selecting

“DISABLE” for SW1 (Trunk A) or SW2 (Trunk B) as appropriate.

Test probes must be carefully attached to the appropriate odd-numbered pins of the test

port. The probes must not short to other pins of the TEST socket or to the chassis. This

interface is most safely accomplished via the Trunk Card Monitoring Board, which acts as

a “breakout” interface to the test points on the trunk card. Figure 14 illustrates the trunk

card pinouts and their labels, as well as the layout of the monitoring board. On the

monitoring board TP1, TP3, TP5, TP7, and TP9 correspond numerically and functionally

with Test Port pins 1, 3, 5, 7, and 9.

Additionally, Zetron has provided redundant test points TP2 (TP1), TP4 (TP3), TP6

(TP5), TP8 (TP7), and TP10 (TP9). The odd-numbered test points best facilitate meter

probe tips; whereas the even-numbered test points serve the oscilloscope probes best, or

alternately facilitate direct solder connections to test equipment.

Rows of pins

on front of card

KILL A1

KILL A2

KILL B1

KILL B2

STORE

FROM TEL A

TO TEL A

FROM TEL B

TO TEL B

GND

Note When using the Monitor Board, it is necessary to “strain relief” all

test leads connected to the monitor board test points, in order to

prevent the board from falling and disconnecting or possibly

shorting TP7 to the faceplate of the trunk card. Strain relief for the

test leads can be attained by looping the leads over the top of the

lock buttons at the top of the trunk card(s).

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ZETRON 2000 Series Especificaciones Pagina 81