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261.
PG-13 EQUIPMENT TROUBLE CHART
See Section 254
TroubleIndicationCauseRemedy
No Sound   Volume control not set correctly. Set volume control correctly.
M-G set not running. Open in power supply line. Check for open switches in the power supply line. replace any fuses which may be burned out. See figure 36.
Amplifier tubes and exciter lamps fail to light. Reading obtained on low voltage meter of M-G set. Fuse blown in low voltage generator circuit. Replace fuse and if it blows again, check for short on low voltage line. See section 248, and figure 36.
Amplifier tubes and exciter lamps light. Reading obtained on high voltage meter of the M-G set. Fuse blown in high voltage generator circuit. Replace fuse and if it blows again, replace the UX-250 tubes in the amplifier unit and again replace the fuse. See figure 36.
Amplifier tubes and exciter lamps light. Fuses of M-G set OK. Defective UX-112A tube. Replace all UX-112A tubes with tubes known to be good.
Low Volume  Defective UX-112A tube. Replace all UX-112A tubes.
One or more UX-250 tubes do not light.Burned out UX-250 tube. Replace burned out UX-250 tubes.
  Defective UX-250 tube. Replace all UX-250 tubes.
Noise or Motor-Boating   Loose connections. Inspect all connections and tighten where necessary.
  Poor ground connections on projectors. Clean and tighten connections.
  Defective "C" batteries. Replace "C" batteries.
Hum   Dirty commutators on generators. Clean the commutators. See section 37.
Whistling Sound   Defective or unmatched UX-250 tubes. Replace the UX-250 tubes with matched tubes.
  Microphonic UX-112A tube. Tap tubes lightly to determine which tube is defective, and replace defective tube.
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Chapter Fourteen Pages
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Chapter
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