ST-47 Groundhog - Technical Manual
Servicing the ST-47
Page 12.
5.1 General
Unless noted otherwise, all the following Procedures are done with power applied to the ST-47. AC
power, as measured on the TB1 terminals 2 (neutral) and 3 hot) must be within the specied
tolerances. If it is not, correct the line voltage problems.
Returning part to Scully for repair or Warranty consideration: Before returning any defective
equipment to the Scully Signal Company for repair and/or Warranty consideration, call Scully at
1.800.272.8559 for an RMA (Return Material Authorization) number.
5.2 Replacing Indicator Lamps
5.2.1 Models with Bypass Switch
Turn off the power to the Groundhog by moving the switch to the far left position. Unscrew the lamp
lens, remove the defective bulb by unscrewing the lamp in the counter-clockwise direction. Insert a
new lamp by reversing the preceding procedure.
Current ST-47-115 models are shipped with LED xtures installed. There are seperate part
numbers for the green replacement LED (09385) and the red replacement LED (09384). Older
models using incandescent lamps can be upgraded by replacing the lamp assembly.
5.2.2 Models without Bypass Switch
Remove the line power from the Groundhog and replace the defective lamp using the procedure in
section 5.2.1.
5.3 Tools & Test Equipment Required for Servicing
5.3.1 Tools
a.) Good quality multi-meter
b.) Flat-blade screwdriver
c.) Two sets of Jumper wires with alligator clips at each end
5.3.2 Required Test Equipment for Wire-Through Mode Operation
Use appropriate equipment from the list below:
a.) Scully Universal Loading Rack Tester, ST-2-DSWJ
b.) Scully Ground Bolt (Part 08560) or Scully Ground Ball (Part 08274)
5.3.3 Required Test Equipment for Stand-Alone Mode Operation
a.) Scully Ground Bolt (Part 08560) or Scully Ground Ball (Part 08274)
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