Model 7600/7620/7640 Reach-Fork ® Truck Section 8. Theory of Operation Pinout Matrix Item Connection Function Description 25 JPC12-8 SSHIFT_LEFT Input to the VM from the sideshift left button (S8). Note: When other aux function switches are activated, reading can change by as much as 0.5V. S8 open: >4.0VDC; S8 closed: <0.5VDC S8 VM 26 JPC12-9 SSHIFT_RIGHT Input to the VM from the sideshift right button (S9). Note: When other aux function switches are activated, reading can change by as much as 0.5V. S9 open: >4.0VDC; S9 closed: <0.5VDC S9 VM 27 JPC12-10 P_HORN Input to the VM from the horn switch (S3). Note: When other aux function switches are activated, reading can change by as much as 0.5V. S9 open: >4.0VDC; S3 closed: <0.5VDC S3 VM 28 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: >4.0VDC; S5 closed: <0.5VDC S5 VM 29 JPC12-12 DGND Reference for all switches and potentiometers in the control handle. If this voltage is not <0.5VDC wrt TP4 on the power panel, then intermittent handle codes may appear. <0.5VDC wrt B– VM Control Handle 30 JPC14-1 B–F Connects B–F on the VM to TP4 (B–) through FU6 on the Fuse/Relay Card. <0.5VDC wrt B– Fuse/Relay Card VM 31 JPC14-2 DGND 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. <0.5VDC wrt B– Fuse/Relay Card VM 32 JPC14-3 DGND Reference for the control circuits in the TPC, LPC, and Operator Display. <0.5VDC wrt B– VM TPC,LPC and Display 33 JPC14-4 BUS_E– BUS_I– Carries negative component of the digital communications between the VM and the TPA, LPA, and the Operator Display. If missing, the LPA and Operator Display cannot communicate with the VM. Troubleshoot using resistance checks in Test I23. No useful information can be gained by measuring the voltage on this wire. 2.24VDC VM TPA, LPA, and Display 34 JPC14-5 +12VP Operating voltage from the VM to the Operator Display. +10.5 to 13VDC VM Display 35 JPC14-6 RELAY_ ENABLE Control path for K1, K2, K3, and K4 on the Fuse/Relay Card. After S1 is closed, all relays are energized simultaneously during SelfTest if the voltage at Battery_Sense_In is at an acceptable level. Relays OFF: B+; Relays ON: <3.0VDC VM K1, K2, K3, and K4 Theory of Operations Publication: 1087967, Issued: 15 Apr 2009 Normal Level Signal Source Signal User 8-17