Models 7700/7720 Reach-Fork ® Trucks Section 8. Theory of Operation Pinout Matrix Item Connection Function Description 19 JPC12-4 REACH 20 JPC12-5 21 22 23 Normal Level Signal Source Input to the VM from the reach switch (S4). Note: When other aux function switches are activated, reading can change by as much as 0.5V. S4 open: >4.0V; S4 closed: <0.5V S4 VM TILT_UP Input to the VM from the tilt up button (S6). S6 open: >4.0V; S6 closed: <0.5V S6 VM JPC12-6 TILT_DOWN Input to the VM from the tilt down button (S7). S7 open: >4.0V; S7 closed: <0.5V S7 VM JPC12-7 H_HTR DC supply to handle heater (HTR6). OFF: <0.5V; ON: 7.5 to 8.5V VM Control Handle SSHIFT_LEFT Input to the VM from the sideshift left button (S8). S8 open: >4.0V; S8 closed: <0.5V S8 VM S9 open: >4.0V; S9 closed: <0.5V S9 VM JPC12-8 Theory of Operations Signal User 24 JPC12-9 SSHIFT_RIGHT Input to the VM from the sideshift right button (S9). 25 JPC12-10 P_HORN Input to the VM from the control handle horn switch (S3). Note: When other aux function switches are activated, reading can change by as much as 0.5V. S3 open: >4.0V; S3 closed: <0.5V S3 VM 26 JPC12-11 RETRACT Input to the VM from the retract switch (S5). Note: When other aux function switches are activated, reading can change by as much as 0.5V. S5 open: >4.0V; S5 closed: <0.5V S5 VM <0.5V; B+ wrt TP1 VM Control Handle 27 JPC12-12 DGND Reference for all switches and potentiometers in the control handle. If this voltage is not <0.5V wrt TP4 on the power panel, then intermittent handle codes may appear. 28 JPC14-1 B–F This connects B–F on the VM to TP4 (B–) <0.5V wrt TP4 through FU6 on the Fuse/Relay Card (FRC). FRC VM FRC VM VM Display 29 JPC14-2 DGND This connects DGND and AGND on the VM to TP4 (B–) through FU6 on the Fuse/Relay Card. This is the reference for all circuits on the truck that are referenced to either DGND or AGND. 30 JPC14-3 DGND Reference for the control circuits in the Operator Display. 8-20 <0.5V; B+ wrt TP1 Publication: 1137893, Issued: 22 Aug 2016