Model 8210/8250 Maintenance Manual Section 8. Theory of Operation
Pinout Matrix
Publication:1146945/001, Revised: 25 Sep 2018 8-9
Pinout Matrix
The pinout matrix chart lists functions and
normal voltages of terminals and harness
connector pins. The matrix columns have the
following meanings:
1. Item #: sequential number to aid in
reference.
2. Connection: the actual wire numbers or
component abbreviations on the electrical
schematic. Refer to the schematic package
for these trucks.
3. Function Description: brief definition of
the connection.
4. Theory of Operation:
a. A detailed description of the
connection. If the voltage is variable, it
indicates the state of a related
component causing the voltage to vary.
b. Identifies possible causes for lack of
correct voltage.
5. Normal Level: the approximate voltage
that should be seen on the wire for the
state indicated. Unless otherwise
indicated, voltages are measured with
respect to (wrt) B– at TP4.
6. Voltage Source: the device or connection
that supplies the voltage directly to the
wire.
7. Voltage User: the device or connection
that the wire directly delivers the voltage
to.
Item Connection
Functional
Description
Theory of Operations
Normal
Level
Voltage
Source
Voltage
User
1TA B+ B+ Power to
Traction
Amplifier
B+ from MPC to Traction Amp used to
produce the AC phases U, V, and W when
the MPC contactor is closed to power the
Traction Motor.
B+ M1
Contactor
TA
2 TA B– B– from Battery B– from the battery. It is used for all the
internal power and control circuits on the
TA, VM, Pump Motor, SW2, Service Port,
and Battery Charger.
< 0.5VDC
with respect
to B–
Battery VM, SW2,
TA, Pump
Motor,
Service
Port, and
Battery
Charger
3 JP1-1 B+ Key Input Provides B+ through fuse FU2 and SPL4
when the Key Switch (SW1) is closed. It is
used to power the control circuits of the TA.
It is also used by the TA to produce 5 and
12VDC.
With Key
Switch OFF:
0VDC
With Key
Switch ON:
24VDC
Key Switch
(SW1)
TA
4 JP1-2 Prop Lower Control path for the Proportional Lower
Solenoid SOL-2. Voltage present during
lower depends on the lower request from
VR2 (Model 6210 only).
De-energized:
B+
Lower
Request:
Varies
proportionally
from 24VDC
to 0VDC at
full lower.
TA SOL-2
Property of American Airlines
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