Tektronix Make your own Tektronix TM-500 extender free download

File name Make_your_own_Tektronix_TM-500_extender.pdf

Make your own Tektronix TM-500 extender using the Jamma Board JB-3. Written by Jan de Rie This document details how to make your own Tektronix TM-500 extender. Such an extender allows you to operate a TM-500 plug-in outside of the cabinet, which is necessary when you are doing measurements on a plug-in, e.g., for repairs. The extender consists of the JB-3 Jamma Board, a 56-pin 0.156" pitch edge connector with solder eyelets, and wires between them, about 3 feet (Figure 1). The goal is to provide the same signals present on the edge connector inside the TM-500 frame to the extender connector. Figure 1: Sample TM-500 extender The TM-500 interface consists of 56 pins divided into two sections: the Power Supply section and the I/O assignment section. The Power Supply section consists of the lower 26 pins of the connector. Because pin B6 is not connected and some of the pins carry the same signal, only 20 wires are needed to connect the Power Supply section (the minimum number of wires needed is actually 19, but I used two 10-wire flat ribbon cables). -1- Tektronix decided to number the pins inside the connector from the bottom to the top, using an A side (left) and a B side (right) when you are facing the front of the connector. Figure 2 shows the pin numbering. Unfortunately, the edge connectors I have seen use a somewhat different numbering system, as does the JB-3 Jamma Board, so we need to be prepared for some mental mapping. Figure 2: TM-500 Power Module Interface Pin Assignment The edge connectors seem to number the pins by using letters on the left side and numbers on the right side, again, when you are facing the connector. When the Jamma Fingerboard is properly installed in the TM-500 frame (insert the "NON- JAMMA PCB/Device side into the connector inside the frame), the connectors to the pins on the left side are labeled 1 to 28 and the connectors to the pins on the right side are labeled A..f. Table 1 shows the mapping between all three references. -2- Table 1: Mapping between Edge Connector and JB-3 Jamma board Tektronix Interface Edge Connector JB-3 Jamma board A1 A 1 B1 1 A A2 B 2 B2 2 B A3 C 3 B3 3 C A4 D 4 B4 4 D A5 E 5 B5 5 E A6 F 6 B6 6 F A7 H 7 B7 7 H A8 J 8 B8 8 J A9