D/S Joy. Center Tap Bad; D/S Joy. Out Of Range High; D/S Joy. Out Of Range Low; Dcap Len Sw Disagreement - JLG 1250AJP Troubleshooting Manual

SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING
Note Pretest Instructions
1.71.5 Backprobe terminal 3, ter-
minal 4, and terminal 5 of the
BLAM module J4 connector
[X089.3 X089.4 X089.5]
1.71.6 Disconnect the load pin con-
nector [X062] and the BLAM
module J4 connector
[X089].

1.72 D/S JOY. CENTER TAP BAD

Flash Code: 2-2
Drive/Steer joystick center tap bad. The drive joystick center tap input [X168.2] is not reading the correct voltage, +/- 10%
from the reference voltage middle point.

1.73 D/S JOY. OUT OF RANGE HIGH

Flash Code: 2-2
Drive/Steer joystick out of range high. The drive joystick input [X168.3] is above the working voltage range.

1.74 D/S JOY. OUT OF RANGE LOW

Flash Code: 2-2
Drive/Steer joystick out of range low. The drive joystick input [X168.3] is below the working voltage range.

1.75 DCAP LEN SW DISAGREEMENT

Flash Code: 8-4
Dual Capacity Length Switch Disagreement. The two main boom dual capacity limit switches are reading the same state. As
in Figure 2-2. Dual Capacity / Transport Switch Mounting on Pg. 179 and Table 2-3. Switch States / Boom Length Regions on
Pg. 179, the dual capacity limit switches should always read opposite, except at the B/C transition.
Note Pretest Instructions
1.75.1 Access the dual capacity
switches #1 [X052] and #2
[X053].
1.75.2 Access the dual capacity
switches #1 [X052] and #2
[X053]. Fully retract the
boom. Note the cams that
the switch levers ride upon
on the side of the fly boom.
1.75.3 Access the dual capacity
switches #1 [X052] and #2
[X053].
1-64
Test
Does the CAN resistance between terminal 3
and terminal 4 of the BLAM module J4 con-
nector [X089.3 X089.4] measure 60Ω and
open circuit between terminal 3 and shield on
terminal 5 [X089.3 X089.5] and open circuit
between terminal 4 and shield on terminal 5
[X089.4 X089.5]?
Is there CAN HI continuity between socket D of
the load pin connector [X062.D.soc] and
socket 3 of the BLAM module J4 connector
[X089.3.soc] and CAN LO continuity between
socket E of the load pin connector
[X062.E.soc] and socket 4 of the BLAM mod-
ule J4 connector [X089.4.soc]?
Test
Are any of these switches stuck or frozen?
Are the switches and cam strips mounted so
that the switch levers engage the entire length
of cam? Also, are the switch levers mounted at
90° to housing as seen when not engaging a
cam?
Are both switches off cam?
1250AJP
Result Corrective Action
Yes Go to step 1.71.6
No See 1.46 BLAM CAN COMMUNICATIONS LOST
on Pg. 48
Yes Replace the load pin
No Check the RED, BLACK, and Shield wires
between the load pin connector [X062.D X062.E]
and the BLAM module J4 connector [X089.3
X089.4]
Result Corrective Action
Yes Clean/repair/replace as needed.
No Keep access to the switches. Go to step 1.75.2
Yes Keep access to the switches. Go to step 1.75.3
No Repair as needed
Yes Check for mechanical failure of the boom tele-
scope cylinder mechanism.
No Keep access to switches. Keep machine on. Go
to step 1.75.4
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