142 JT920/JT920L - MAINTENANCE
TROUBLESHOOT STRIKE SYSTEM
142 JT920/JT920L - MAINTENANCE
TROUBLESHOOT STRIKE SYSTEM
Battery power
light is on, but
system OK light is
off
Problem detected during
test
Check for error code and
have control module
checked or replaced
Defective control module Have control module
checked or replaced
Strobe light on
drilling unit does
not work during
total test
Improper connections with
control module
Check connections and
wiring harness
Defective strobe light Disconnect strobe and
connect to external 12 volt
power source. If strobe does
not work, replace
Defective control module Have control module
checked or replaced
Alarm on drilling
unit does not
work during total
test
Improper connections with
control module
Check connections and
wiring harness
Defective alarm Disconnect alarm and
connect to external 12 volt
power source. If alarm does
not work, replace
Defective control module Have control module
checked or replaced
Strobe light and
alarm on drilling
unit do not work
during total test
Improper connections with
control module
Check connections and
wiring harness
Defective control module Have control module
checked or replaced
EC2 and current
problem light on
Improper connections with
control module
Check cable connections on
control module and current
transformer
Defective current
transformer
Disconnect current
transformer. Check that
resistance pin 1 to pin 4 is
20-40 ohms, pin 1 to pin 2 is
20-40 ohm, and pin 2 to pin
4 is less than 1 ohm
Defective current
transformer cable
Disconnect cable from
transformer and control
module. Check continuity of
cable. If continuity is zero or
cable is damaged, replace
Defective control module Have control module
checked or replaced
EV2 and voltage
problem light on
Improper connections with
control module
Check cable connection on
control module
Defective voltage limiter Have voltage limiter
checked or replaced
Defective control module Have control module
checked or replaced
Battery power
light is on, but
system OK light is
off
Problem detected during
test
Check for error code and
have control module
checked or replaced
Defective control module Have control module
checked or replaced
Strobe light on
drilling unit does
not work during
total test
Improper connections with
control module
Check connections and
wiring harness
Defective strobe light Disconnect strobe and
connect to external 12 volt
power source. If strobe does
not work, replace
Defective control module Have control module
checked or replaced
Alarm on drilling
unit does not
work during total
test
Improper connections with
control module
Check connections and
wiring harness
Defective alarm Disconnect alarm and
connect to external 12 volt
power source. If alarm does
not work, replace
Defective control module Have control module
checked or replaced
Strobe light and
alarm on drilling
unit do not work
during total test
Improper connections with
control module
Check connections and
wiring harness
Defective control module Have control module
checked or replaced
EC2 and current
problem light on
Improper connections with
control module
Check cable connections on
control module and current
transformer
Defective current
transformer
Disconnect current
transformer. Check that
resistance pin 1 to pin 4 is
20-40 ohms, pin 1 to pin 2 is
20-40 ohm, and pin 2 to pin
4 is less than 1 ohm
Defective current
transformer cable
Disconnect cable from
transformer and control
module. Check continuity of
cable. If continuity is zero or
cable is damaged, replace
Defective control module Have control module
checked or replaced
EV2 and voltage
problem light on
Improper connections with
control module
Check cable connection on
control module
Defective voltage limiter Have voltage limiter
checked or replaced
Defective control module Have control module
checked or replaced
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