Figure 1-28.—TT-48/UG Model 28 floor-mounted KSR teleprinter.

Figure 1-28.—TT-48/UG Model 28 floor-mounted KSR teleprinter. All teletype Model 28 printers use rolls of paper, which are inserted into the printer through the top. The paper may be single copy (single ply) or have three layers of paper and two layers of carbon (5-ply). Various colors of paper are also available. Usually, only single-ply yellow is used in meteorological Figure 1-29.—TT-69/UG Model 28 tabletop KSR teleprinter. Figure 1-30.—AN/UGC-20 Model 28 compact KSR teleprinter. offices. Paper loading instructions are found inside the printer when the lid is opened. These teleprinters use inked cloth ribbons, supplied on a single metal spool. Ribbon routing instructions are also listed inside the case. When installing a new ribbon, you must save one of the two used ribbon spools to attach to the new ribbon. Never reink and reuse old ribbons. Always replace them when the printing is very light or the ribbon shows signs of fraying or tearing, especially around the small metal eyelets near each end of the ribbon. These eyelets activate the ribbon- direction-reverse lever inside the teleprinter. If an eyelet tears loose from the ribbon, the reverse lever is not activated, and the ribbon advance gears or the ribbon mounting assembly may be damaged when the ribbon pulls taut. Figure 1-31.—AN/UGC-25 Model 28 compact RO teleprinter. 1-43