Blam Backup Communications Link Faulty - JLG 1250AJP Troubleshooting Manual

SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING

1.44 BLAM BACKUP COMMUNICATIONS LINK FAULTY

Flash Code: 9-9
BLAM backup communications link faulty. The ground module was not able to communicate with the BLAM during the star-
tup test of the backup communications link. The BCS indicator will turn on and the machine will not leave transport position.
Note Pretest Instructions
1.44.1 Connect analyzer at ground
module. Turn on machine.
1.44.2 Take the following measure-
ment by backprobing. See
Backprobing on Pg. 319.
1.44.3 Disconnect ground module
J1 [X001]
1.44.4 Connect analyzer at ground
module. Turn on machine
1.44.5 Connect analyzer at ground
module. Turn on machine.
1.44.6 Disconnect ground module
J1 [X001]
1.44.7 Disconnect RS-232
passthru [X015]
1.44.8 Disconnect RS-232
passthru [X015]
1.44.9 Turn off machine. Discon-
nect RS-232 passthru
[X015].
1.44.10 Disconnect RS-232
passthru [X015] and ground
module J2
1.44.11 Disconnect RS-232
passthru [X015] and ground
module J1
1-46
Test
Does the analyzer turn on?
Is there about 8.5 VDC between ground mod-
ule J1 terminal 28 [X001.28] and terminal
31[X001.31]?
Is there continuity between ground module J1
socket 31 [X001] and ground analyzer pin 4
[X013.4.pin]?
Does the analyzer start up and say "MENU:
HELP: PRESS ENTER"?
Does the analyzer say, "CONNECT FAILURE"? Yes
Is there continuity between ground module J1
socket 29 [X001.29.soc] and ground analyzer
pin 2 [X013.2.pin]? -AND- Is there continuity
between ground module J1 socket 30
[X001.30.soc] and ground analyzer pin 3
[X013.3.pin]?
Is there continuity between RS-232 passthru
pin 1 [X015.1.pin] and RS-232 passthru pin 2
[X015.2.pin]? Also, is there continuity
between RS-232 passthru pin 5 [X015.5.pin]
and RS-232 passthru pin 6 [X015.6.pin]?
Is there 160Ω ±15% between RS-234
passthru pin 4 [X015.4.pin] and pin 8
[X015.8.pin]?
Turn on machine. About 4 seconds after
machine is turned on does voltage measure
about 8.5 VDC between RS-232 passthru
socket 4 [X015.4.soc] and socket 8
[X015.8.soc]?
Is there continuity between RS-232 passthru
socket 4[X015.4.soc] and ground module J2
socket 45 [X002.45.soc]?
Is there continuity between RS-232 passthru
socket 8[X015.8.soc] and ground module J1
socket 9 [X002.9.soc]?
1250AJP
Result Corrective Action
Yes Keep test setup in place.
Go to step 1.44.4
No Go to step 1.44.2
Yes Go to step 1.44.3
No Reprogram/replace ground module
Yes Repair/replace harness between ground module
J1 socket 28 [X001.28.soc] and ground analyzer
pin 1 [X013.1.pin]
No Repair/replace harness between ground module
J1 socket 31 [X001.31.soc] and ground analyzer
pin 4 [X013.4.pin]
Yes Go to step 1.44.8
No Keep analyzer connected and machine on.
Go to step 1.44.5
Go to step 1.44.6
No Go to step 1.44.8
Yes Replace ground module
No Go to step 1.44.7
Yes Repair/replace harness between ground module
J1 [X001] and RS-232 passthru [X015]
No Repair/replace RS-232 backup relay assembly.
Yes Keep RS-232 passthru disconnected.
Go to step 1.44.9
No Replace RS-232 backup relay
Yes Go to step 1.44.12
No Keep connector disconnected.
Go to step 1.44.10
Yes Keep connectors disconnected
Go to step 1.44.11.
No Repair/replace harness between RS-232
passthru [X015] and ground module J2
Yes Replace ground module
No Repair/replace harness between RS-232
passthru [X015] and ground module J1
3128411