IBM 5100 Maintenance Information Manual page 345

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CE General Logic Probe (Part 453212)
The universal logic probe provides a visual indication of
a line level. The probe can also be used to detect
pulses and as a babysitter. (Refer to handbook that
comes with probe.)
Probe UP and DOWN lights will momentarily
flash on during power up if the probe is
connected to its machine power source.
Please ignore.
Indicator Lights - - - - - -
UP indictes an up level (+).
DOWN indicates a down level (-).
A pulsing line is indicated by
both lights being on.
Both lights are off if the line
level is from +1.0 Vdc to +2.0 Vdc
for MULTI logic setting.
Safe Operating Ranges:
MULTI +60.0V
Logic MST 2/4 +14.0V
Selector MST 1 +14.0V
Voltages greater than the above
ranges will damage the probe.
povverLeads----____
==~:;==============~~~~~~
CAUTION
Improper connection of the power lead might cause the
probe to malfunction.
Connect the black (-) lead to M2D08 (gnd). Connect the
other (+) lead to M2D03. A voltage difference of 4V to
12V is needed to power the probe, with the black lead
always the most negative. For the 5103 Printer, connect
the black (-) lead to test point G6 (gnd) and connect the
other (+) lead to test point V4 (+5V). For the 5106
Auxiliary Tape Unit. connect the black (-) lead to
A 1-A4D08 (gnd) and connect the other lead to
A 1-A4D03 (+5V).
Note: Power for the probe can be obtained from any of
the above devices when probing any other device.
Appendix A
Test Terminal
The line being probed is connected
to this terminal. (Various probes may
be attached, other than the one
shown, to aid in probing.) Do not
use tip longer than 3 inches (76.2 mm).
Ground Lead
Connect this lead to any signal ground
near the probe point. Do not use
frame ground.
CAUTION
Improper indications result if this
lead is not connected to signal
ground. A maximum length of 4
inches (101.6 mm) can be used.
Logic Selector (TECHNOLOGY)
• 51 00: MULTI
Selects the type of logic to be
probed. Circuits probed in the
5100 Portable Computer require
the MULTI setting.
LATCH Svvitch
• 5100: NONE
Allows the probe to be used as a
babysitter. The up position allows
latching the UP light on a positive
pulse. The down position allows
latching the DOWN light on a
negative pulse. NONE position
resets the lights and prevents any
latching action. This position is
used for most probing in the 5100
Portable Computer.
GATE REF Volts Svvitch
• 5100: GND
This switch affects only the gating
terminals and is not required for
probing the 5100 Portable Computer.
GATING Terminals
These terminals are not required
for probing the 5100 Portable
Computer.
CE General Logic Probe (Part 453212) A·3