Section 9. Theory of Operation
Toyota Orderpicker Model 7BPUE 15 Service Manual
Key Switch (S1 ) O n
Key Switch ( S l ) 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 a t JP2- 1 1 a s B+ESTOP. Refer to the schematic in Figure 9-3 on page 9- 12. (The electrical schematic legend is on page 9-2.)
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 (12VP) is present a t 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)
The following voltage points are measured with respect to TP4 (B-): 1. Turning the key switch (S1) on supplies battery voltage from S1-2 to JPC1 1 - 1 (B+ KEY). 2. Battery voltage is a t the following points on the carriage manager: JPC 1 1-2 through S2 1 to JPC1 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 a t the following points on the steer/tractor manager: JPT11-10 (B+ KEY) to the traction power amplifier J 1 -16 4. Battery voltage is a t the following points on the steer/tractor manager a s B+ ESTOP: JPT12-2 1 through the load-holding solenoid coil to JPT12-9 JPT12-21 through the lift/lower solenoid coil to JPT12-8 JPT12-2 1 through the PC contactor coil to JPT12-20
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) JPC12-6 (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) JPC1 -1 (operator display)
8. +5 volts is present a t JPC2-3 (steer encoder) on the carriage manager. 9. +5 volts is present a t PT6-3 steer feedback encoder) on the steer/tractor manager. With the wire guidance option, the guidance manager receives: 1. Battery positive a t JPS2-1 1 a s 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
