printed out at the convenience of the receiving operator. An important advantage of Mode B operation
is that significantly less time is required on the communications link.
(1) The data in the sending LDF's image memory can be retrieved by the sending LDF
operator for local printout (SELF-TEST mode), thereby functioning as a copying machine.
(2) Table 2 contains a description of the operating controls and indicators. Detailed step-by-
step instructions are provided in Chapter 2, TM 11-5815-615-10.
c. Preparation for operation. The LDF may be operated from +28 V DC; 110 V AC, 50-400
Hz; or 220 V AC, 50-400 Hz.
(1) Power requirements. Power to the LDF is provided through power connector J2 (Figure
4). An AC power cable is supplied with the equipment and stored in the cover. The +28 V DC power
source is usually used when LDFs are vehicle mounted. A 28 V DC power cable is not provided with
the equipment but cable information is given in Table 3. No equipment adjustment is required,
regardless of power source.
(2) LDF communications interface requirements. LDF interface links depend on the type of
equipment being used. The LDFs may be connected together by field wire or public telephone
transmission lines using binding posts, or by radio link using J1 as the signal port. Note that voice
communication is inhibited while the communications channel is passing facsimile information.
(a) When field wire or public telephone system interconnections are used (for example,
line connections are made at the LINE binding posts) (Figure 4), the jumper plug which is permanently
attached to the LDF by a chain must be connected to signal connector J1. A telephone set connected to
(b) All other signal inputs are through signal connector J1. A radio handset connected to
connector J3 (Figure 1) located in the front of the LDF is used for voice communications when signal
connector J1 is used.
d. Document loading/unloading. The LDF must be powered up and the drum engaged in the
home position before a document can be inserted onto the drum.
(1) When the drum is in the home position, pressing the PAPER RELEASE lever (Figure 5)
enables the operator to insert the input copy into the slot in the drum of the sending LDF. When the
PAPER RELEASE lever is pressed beyond a certain point and released, the margin lamps start flashing.