Sec-5.1
Section 5: Troubleshooting
GCL-MJ-MH operators include a self-diagnostic circuit board using troubleshooting LED indicators to signal
the technician of a problem.
TROUBLESHOOTING LED’s
HOIST
INTERLOCK
EXTERNAL
INTERLOCK
+24VDC STB
ENABLE
INDICATION
OFF STB Disabled
ON STB Enabled
ON ON ON Normal Operating Condition
OFF ON ON Hoist Interlock Switch Open:
• Hoist release requires reset
• Hoist interlock connector not plugged in
• Hoist interlock defective
OFF OFF ON External Interlock Open
OFF OFF OFF Power Supply Problem:
• Check AC power supply
• Check main power fuse
• Check secondary fuse (2A)
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STB
ENAB
+ 24
VAC
EXT
INTLK
HOIST
INTLK
TROUBLESHOOTING
LEDs
STB
ENAB
+ 24
VDC
EXT
INTLK
HOIST
INTLK
DETAIL
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