TM 5-6115-434-12 (b) Visually inspect thermal relay for corrosion, cracks, damaged threads or other evidence of damage. (3) Installation.  Install in reverse order of removal procedures. b. Relay Armature (eight used, E19, K20, K21, K23, K24, K25, K26, K27). (1) Removal.  Remove cover from electrical connections on relay.  Tag and disconnect electrical connections to relay.  Remove four screws and eight washers from relay.  Remove relay from panel. (2) Cleaning and inspection. (a) Clean    relay    with    filtered    compressed  air  or  wipe  with  a  clean  rag  moistened  with  an  approved cleaning solvent. (b) Visually inspect relay for corrosion, cracks, damaged threads or other evidence of damage. (3) Installation.  Install in reverse order of removal procedures. c. Relay, Time Delay (two used, K17, K18). (1) Removal.  Tag and disconnect electrical connection from relay.  Remove four screws and eight washers from relay.  Remove relay from panel. (2) Cleaning and inspection. (a) Clean      relay    with  filtered  compressed  air  or  wipe  with  a  clean  rag  moistened  with  an  approved cleaning solvent. (b) Visually inspect relay for corrosion, cracks, damaged threads or other evidence of damage. (3) Installation.  Install in reverse order of removal procedures. d. Terminal Strip. (1) Removal.  Remove terminal board cover from terminal board.  Tag and disconnect electrical connections and bus bars to terminal board.  Remove four nuts and washers attaching terminal board to panel assembly.  Remove terminal board from panel assembly. (2) Cleaning and inspection. (a) Clean  terminal  board  with  filtered  compressed  air  and  electricians  brush  or  wipe  with  a  clean  rag moistened with an approved cleaning solvent. (b) Visually    inspect    terminal    board  for  corrosion,  cracks,  damaged  threads  or  other  evidence  of damage. (3) Installation.  Install in reverse order of removal procedures. 3-58.  Temperature Control Panel Assembly (fig. 3-18) Maintenance procedures for components mounted on the temperature control panel consists of cleaning, removal and replacement of damaged components. Warning Electrical power shall be shut off prior to maintenance on electrical components. Note Access to the temperature control panel is obtained by removing four bolts and four washers from the perimeter of panel.  Carefully work panel out far enough to gain access to component parts. a. Panel Illumination Lamp. (1) Removal.    Tag  and  disconnect  electrical  connections  to  lamp  assembly.    Remove  nut  and  washer  from lamp assembly.  Remove lamp assembly from panel. (2) Cleaning and inspection. (a) Clean  lamp  assembly  with  filtered  compressed  air  and  electricians  brush  or  wipe  with  a  clean  rag moistened with an approved cleaning solvent. (b) Visually  inspect  lamp  assembly  for  corrosion,  cracks,  damaged  threads,  or  other  -evidence  of damage. (3) Installation.  Install in reverse order of removal procedure. b. Cooled Air Lamp Assembly (two used, system No.  1 and No.  2). (1) Removal.    Tag  and  disconnect  electrical  connections  to  lamp  assembly.    Remove  nut  and  washer  from lamp assembly.  Remove lamp assembly from panel. (2) Cleaning and inspection. (a) Clean  lamp  assembly  with  filtered  compressed  air  and  electricians  brush  or  wipe  with  a  clean  rag moistened with an approved cleaning solvent. (b) Visually   inspect   lamp   assembly   for   corrosion,   cracks,   damaged   threads   or   other   evidence   of damage. (3) Installation.  Install in reverse order of removal procedure. 3-65