JLG 1200SJP Service Maintenance Manual page 493

STEP ACTION REQUIRED
1 Install the Analyzer at the ground station, scroll to the "Diag-
nostics" sub level menu, press "enter" then scroll to the "Ver-
sions" menu item press "enter" and view the screen,
reference the Diagnostics / Version Chart to assist you in
determining 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.
2 Disconnect the Ground Module J7 deutsche plug connection
at the "T" fitting inside of the ground control station. Perform
an ohms check at the "A" and "B" pins of the "T" fitting.
Inspect the shield wire "C" for shorts.
3 Make sure the CANbus link wires are installed correctly at the
Platform Module.
4 Disconnect the platform cannon plug and ground cannon
plug that holds the CANbus link. Red (3) Black (2) and Shield
(1) perform a continuity test.
5 Disconnect the deutsche plug connection from the Platform
Module at the "T" fitting inside of the ground station. Per-
form an ohms check at the "A" and "B" sockets of the
deutsche plug. Inspect the shield wire "C" for shorts.
6 Inspect the Platform Module harness connection at the
ground cannon plug and at the "T"' fitting inside of the
ground control station.
7 Disconnect the deutsche plug connection from the Boom
Length & Angle Module 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.
8 Disconnect all deutsche plug connections 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 corresponding letters of the other two
connections.
9 Disconnect the Chassis Module deutsche plug at the "T' fit-
ting below the Boom Length & Angle Module. Perform an
ohms check at the "A" and "B" sockets of the deutsche plug.
Inspect the shield wire "C" for shorts.
3121142
Table 6-7. Troubleshooting: Platform Can Communications Lost
See Diagnostics / Version Chart
Approximately 60 ohms.
See Electrical Schematic in Section 7
Continuity
Approximately 120 ohms.
Continuity
Approximately 120 ohms
Continuity (NO OHM VALUES)
Approximately 120 ohms
– JLG Lift –
SECTION 6 - JLG CONTROL SYSTEM
SPEC
See step 2
CANbus circuit is
complete. Platform
Module suspected
defective
Go to step 4
Reconnect plug and go to step 5
Reconnect plug and go to step 6
Reconnect harness and go to
step 7
Reconnect plug and go to step 8
Reconnect all deutsche plugs at
the "T" fitting and go to step 9
Reconnect deutsche plug and
go to step 10
YES NO
See step 2
Reconnect plug and go to step 3
Wire per Electrical Schematic
Repair or replace platform har-
ness.
Suspected defective Platform
Module.
Repair or replace harness inside
the ground control station.
Verify step 7, inspect the BLAM
to Ground Module harness con-
nection s at both "T" fitting con-
nections for proper continuity
and correct wiring per Electrical
schematic.
Replace defective "T" fitting
plug.
Inspect the harness from the
"T" fitting at the BLAM to the
Chassis Module plug connec-
tion at the battery. Assure
proper continuity and correct
wiring per Electrical Schematic.
6-117