JLG 1250AJP Service Manual - Manual (Page 546)

SECTION 6 - JLG CONTROL SYSTEM
6-114 – JLG Lift – 3121171
Table 6-8. Troubleshooting: Platform Can Communications Lost
STEP ACTION REQUIRED SPEC YES NO
1 Install the Analyzer at the ground station,
scroll to the ”Diagnostics” sub level
menu, press ”enter” then scroll to the
”Versions” menu item press ”enter” and
view the screen, reference the Diagnos-
tics / Version Chart to assist you in deter-
mining which module has lost it’s
communication link. In some cases the
module that shows up with a question
may be defective if all other CANbus links
check OK. See Diagnostics / Version
Chart See step 2 See step 2
2 Disconnect the Ground Module J7
deutsche plug connection at the "T" fitting
inside of the ground control station. Per-
form an ohms check at the ”A” and ”B”
pins of the "T" fitting. Inspect the shield
wire ”C” for shorts. Approximately 60 ohms. CANbus circuit is
complete. Platform
Module suspected
defective Reconnect plug and
go to step 3
3 Make sure the CANbus link wires are
installed correctly at the Platform Module. See Electrical Schematic in
Section 7 Go to step 4 Wire per Electrical
Schematic
4 Disconnect the platform cannon plug and
ground cannon plug that holds the CAN-
bus link. Red (3) Black (2) and Shield (1)
perform a continuity test. Continuity Reconnect plug and
go to step 5 Repair or replace
platform harness.
5 Disconnect the deutsche plug connec-
tion from the Platform Module at the ”T” fit-
ting inside of the ground station. Perform
an ohms check at the ”A” and ”B” sockets
of the deutsche plug. Inspect the shield
wire ”C” for shorts. Approximately 120 ohms. Reconnect plug and
go to step 6 Suspected defective
Platform Module.
6 Inspect the Platform Module harness con-
nection at the ground cannon plug and at
the ”T”’ fitting inside of the ground control
station. Continuity Reconnect harness
and go to step 7
Repair or replace har-
ness inside the
ground control sta-
tion.
7 Disconnect the deutsche plug connec-
tion from the Boom Length & Angle Mod-
ule at the ”T’ fitting inside of the ground
station. Perform an ohms check at the ”A”
and ”B” sockets of the deutsche plug.
Inspect the shield wire ”C” for shorts. Approximately 120 ohms Reconnect plug and
go to step 8 Verify step 7, inspect
the BLAM to Ground
Module harness con-
nection s at both ”T"
fitting connections for
proper continuity and
correct wiring per
Electrical schematic.
8 Disconnect all deutsche plug connec-
tions at the "T” fitting in the ground station
and the BLAM, perform a continuity test
on all ”A” ”B” and ”C” pins use the singular
end of the fitting and cross probe the cor-
responding letters of the other two con-
nections. Continuity (NO OHM VAL-
UES) Reconnect all
deutsche plugs at the
"T” fitting and go to
step 9 Replace defective ”T"
fitting plug.