Twr Trn Sw Disagreement - JLG 1250AJP Troubleshooting Manual

Note Pretest Instructions
1.369.4 Disconnect BLAM J3 X088].
Turn on machine.
1.369.5 Unclip sensor #2 (bottom)
[X094] cable from boom.
Observe resistance between
tower boom length sensor 1
(Top) pin A [X094.A.pin] and
pin C [X094.C.pin].
1.369.6 Disconnect tower boom
length sensor #2 (bottom)
[X094] and BLAM J3 [X088]
1.369.7 Disconnect tower boom
length sensor #2 (bottom)
[X094] and BLAM J3 [X088]
1.369.8 Disconnect tower boom
length sensor #2 (bottom)
[X094] and BLAM J3 [X088]

1.370 TWR TRN SW DISAGREEMENT

Flash Code: 8-4
Tower transport switch disagreement. The two tower boom transport length switch inputs are reading the same state. The
normally closed (NC) and normally open (NO) switch inputs should always read opposite. In the transport position the NC
switch should be CLOSED and the NO switch should be OPEN. Switch states are visible in ANALYZER ⇒ DIAGNOSTICS ⇒
BOOM SWITCHES ⇒ TOWER TELESCOPE SWITCH Nx
Note Pretest Instructions
1.370.1
1.370.2
1.370.3
3128411
SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING
Test
Is there about 5VDC between BLAM J3 pin 10
[X088.10.pin] and pin 12 [X088.12.pin]?
Have second person slowly walk cable out
and back completely. The sensor cable
extends 400 inches (33' 4"). (Do not allow
cable to retract in an uncontrolled or rapid
manner. This will break the sensor.) Does
resistance change smoothly and consistently
up to 5000 Ω ± 500 Ω and back?
Is there a short between tower boom length
sensor #2 (bottom) socket C [X094.C.soc] or
BLAM J3 socket 11 [X088.11.soc] to battery
negative [X117]?
Is there continuity between tower boom length
sensor #2 (bottom) socket C [X094.C.soc]
and BLAM J3 socket 11 [X088.11.soc]?
Is there a short between tower boom length
sensor #2 (bottom) socket C [X094.C.soc]
and socket B [X094.B.soc]?
Test
Check the tower boom transport length switch
power. Terminal 14 and 22 of the tower boom
transport switch [X056.22] should measure
12VDC.
In the transport position, terminal 1 of the 6
position Mate-N-Lok connector in the main
terminal box [X017.1] should measure
12VDC.
In the transport position, terminal 29 of the
ground module J7 connector [X007.29]
should measure 12VDC.
1250AJP
Result Corrective Action
Yes Repair/replace harness between BLAM J3
[X088] and tower boom length sensor #2 (top)
[X094]
No Replace BLAM
Yes Go to step 1.369.6
No Replace tower boom length sensor #2 (bottom)
[X094]
Yes Repair/Replace harness between tower boom
length sensor #2 (bottom) socket C
[X094.C.soc], BLAM J3 socket 11
[X088.11.soc] and battery negative [X117]
No Leave tower boom length sensor #2 (bottom)
[X094] and BLAM J3 [X088] disconnected. Go to
step 1.369.7
Yes Go to step 1.369.8
No Repair/Replace harness between tower boom
length sensor #2 (bottom) socket C
[X094.C.soc], BLAM J3 socket 11
[X088.11.soc].
Yes Repair/Replace harness between tower boom
length sensor #2 (bottom) socket C
[X094.C.soc] and socket B [X094.B.soc]
No Reprogram/replace BLAM
Result Corrective Action
Yes Go to step 1.370.4
No Go to step 1.370.2
Yes Repair/Replace the white wire between the
switch and the 6 position Mate-N-Lok connector
in the main terminal box [X017.1]
No Go to step 1.370.3
Yes Repair/Replace the YEL/RED 2-60 wire between
the 6 position Mate-N-Lok connector in the main
terminal box [X017.1] and terminal 29 of the
ground module J7 connector [X007.29]
No Repair/Replace the ground module
1-171