Symptom Based Troubleshooting - Siemens MJ-X Troubleshooting Manual

MJ-X Troubleshooting Guide
Main Processor Board Jumper Table
Jumper Jumper
Location Type
J104 pins part of 24
6&8 pin
header
J110 3 pin
header
J111 3 pin
header
J113 3 pin
header
J115 3 pin
header
J116 2 pin
header
J117 2 pin
header
J118 2 pin
header
J119 2 pin
header
J120 2 pin
header
J121 3 pin
header
J122 3 pin
header
J123 2 pin
header
Unless otherwise noted, AC voltages are measured referenced to AC return ("E"). DC voltages are
measured reference to logic ground (GND). The logic ground is necessarily dc-isolated from the AC
return. Avoid connecting the logic ground to "E" or any other AC signals.
Note: The (local) data port should be jumpered as "DCE" for connecting to a terminal device (such as a
notebook or laptop computer) when using a straight-through cable. The (local) data port should be
jumpered as "DTE" for connecting to a modem when using a straight-through cable. Refer to MJ-X
Application Note 5 for further information.

5. Symptom Based Troubleshooting

Apply power and determine trouble symptom. Use Troubleshooting Symptom Tables below. [Find the
symptom that most completely describes what you are observing.]
Using MJXplorer, save the present MJ-X configuration and load "default" configuration.
To troubleshoot, use "known working" Power Board, Main Processor (MP) board, and MJ-X overlay. To
isolate faults, substitute the known good board/assembly. Make sure the "known good" board/assembly
has correct jumpering and configuration.
LLC
Siemens T&D
Jumper Jumper Purpose
Position
IN (SW Connects DSACK0- to ground. (Indicates to uP that the data
Vers.2.03) bus is 8 bits rather than 16 bits.) This jumper needs to be
Out (SW removed for connecting the test connector (J104) to the
Vers.2.10 & up) Background Debug Mode (BDM) cable/interface.
2-3 1-2: For 128K x 8 Boot Flash device (28F001) at U2.
2-3: For 256K x 8 (any type) device (e.g., 28F020) at U2.
2-3 1-2: For 128K x 8 Boot Flash device (28F001) at U2.
2-3: For 256K x 8 (any type) device (e.g., 28F020) at U2.For
1-2 1-2: For 128K x 8 (or 32K x 8) Static RAM device at U3.
2-3: For 512K x 8 Static RAM device at U3.
1-2 1-2: Reset not asserted.
2-3: Reset asserted. (Connect this momentarily only.)
IN Connects D0 to pull down resistor. This connection is also
made with a trace on the circuit board for pre-production MP.
OUT Connects AGND to (digital) GND. Useful when testing MP
board by itself.
OUT Allows for a remote speaker to be used instead of the on
board speaker. (If remote used, remove on board speaker.)
OUT Connects (digital) GND to chassis, for protection.
IN For pre-production MP boards (version "0P") only.
Connects data port connector shell to chassis, for protection.
1-2 1-2: For (local) data port wired as a "DCE".
2-3: For (local) data port wired as a "DTE".
1-2 1-2: For (local) data port wired as a "DCE".
2-3: For (local) data port wired as a "DTE".
IN For connecting DCE output handshake signals to local port
data connector (J106). (Out for DTE application.)
4
AED-000025-04
version: 5 January 1998