Table 2-4. Electrical Components (cont).

TM 5-3610-286-20 Table 2-4. Electrical Components (cont). Reference Type designator Description Function Accessories u2 Electronic unit Sheet feeder control (cont) complete BAK Consisting of: sheet feeder electronic BAE reflex light barrier RL 1 Pulse switch adapter u3 Delivery lighting cpl. u5 Powder heating unit u20I, Sheet counter, complete - u20II 28V g3 Speed indicator g7 Tacho dynamo d. Use of Schematic. Figure FO-1 is a detailed electrical schematic of the TSS printing press. Refer to this schematic when performing electrical troubleshooting procedures. Test points are indicated by number or letter so that continuity or voltage readings, as required, can be made. This determines if a particular component, electrically wired between two test points, is malfunctioning. Test points such as A1-A2, 13-14, etc. for relays or contractors are located on the face of the com- ponent. Tests on relays and contractors must be made with the panels of the main control box re- moved. Refer to figure 2-1 to locate components in the main control box. In the case of relays and contractors, several circuits may pass through different sets of terminals or their components. The relay or contactor may be functioning correctly in one circuit, but malfunctioning in another. Since these are nonrepairable items, they should be replaced if there is any problem with any circuit. Addi- tional test points are located on the terminal strips in the main power control box (figure 2-1). The schematic is laid out as a ladder with reference locations across the top. This aids in making sure that all components in the circuit (a straight line between signal or voltage supply and return) are accounted for when checking out a circuit. WARNING Main control box door locking solenoid holds panel doors shut during opera- tion. It does NOT shut off power if doors are already open for troubleshooting and main power switch is set to ON. e. Unidentifiable Malfunctions. This manual cannot list all of the malfunctions that may occur, nor all the tests and inspections and corrective actions. If a malfunction is not listed or is not corrected by the listed corrective actions, notify your supervisor. 2-17