Section
9.
Theory of Operation Toyota Orderpicker Model
7BPUE
15 Service Manual
Key Switch (S
1
)
On
Key
Switch
(Sl)
On
When the key switch is first turned on, the
microprocessor control system performs a
self
-
diagnostics of certain inputs and outputs.
The self
-
diagnostics lasts approximately 1
second. Sensor leads are checked for the
correct voltages during the self
-
diagnostics. If a
problem is detected, the
steer/tractor manager
prevents truck operation and displays a fault
code on the operator display.
With the wire guidance option, the guidance
manager receives battery voltage at JP2
-
1 1 as
B+ESTOP.
Refer to the schematic in Figure 9
-
3 on
page 9
-
12. (The electrical schematic legend is
on page 9
-
2.)
The following voltage points are measured with
respect to TP4 (B
-
):
1. Turning the key switch
(S
1) on supplies
battery voltage from
S
1
-
2 to JPC 1 1
-
1 (B+
KEY).
2. Battery voltage is at the following points
on the carriage manager:
JPC 1 1
-
2 through S2 1 to JPC 1 1
-
3 (B+
ESTOP)
JPC9-4 (B+KEY) to JFT10-4 on the
steer/tractor manager
JPC9-3 (B+ ESTOP) to JPT10-3 on the
steer/tractor manager (closing relay K1)
3.
Battery voltage is at the following points
on the
steer/tractor manager:
JPT11-10 (B+ KEY) to the traction
power amplifier
J
1
-
16
4. Battery voltage is at the following points
on the
steer/tractor manager as B+
ESTOP:
JPT12-2 1 through the load
-
holding
solenoid coil to
JPT12-9
JPT12-2 1 through the lift/lower
solenoid coil to JPT12-8
JPT12-2 1 through the PC contactor coil
to JPT12-20
JPT12-21 through the brake coil to
JPT12-17
5. The steer/tractor manager receives battery
voltage and produces the following
voltages:
+12volts (12VP)
+5 volts
Boost for steer power head
6.
+
12 volts (1 2VP) is present at the following
points on the
steer/tractor manager:
JPT5-2 (height 120"/ 150
"
switch S29)
JPT5-5 (height 180
"
switch S25)
JFT5-8 (optional lift limit switch S24)
JPT7-2 (spare switch input)
JPT3-2 (steer home sensor
S8)
JFT12-6 (optional hour meter)
JPT9-6 (to carriage manager)
JPT1-9 (MULTI connector)
JFT8-8 (steer power head)
7.
+
1 1.3 volts is supplied by the carriage
manager to the following points on the
carriage manager (this is generated from
+
12VP from the steer/tractor manager):
JPC3
-
6 (optional lower limit S60)
JPC 12
-
6 (optional sidegate switch 1,
S19)
JPC7
-
2 (Deadman 1 S2)
JPC7
-
5 (Deadman 2 S23)
JPC7-8 (24
"
limit switch S6)
JPC7- 1 1 (60
"
height switch S7)
JPC 12
-
15 (optional sidegate switch 2,
S20)
JPC 1
-
1 (operator display)
8.
+5 volts is present at JPC2
-
3 (steer
encoder) on the carriage manager.
9.
+5 volts is present at PT6
-
3 steer feedback
encoder) on the
steer/tractor manager.
With the wire guidance option, the guidance
manager receives:
1. Battery positive at
JPS2- 1 1 as B+ESTOP.
This is also used by the power supply on
the guidance manager
(GM)
to generate
+12 volts which is used by the steer
00700
-
CL222
-
05,
1
5
March 2005
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