Chapter 2. INSTALLATION AND OPERATION

TM 11-6780-225-12

CHAPTER 2

INSTALLATION AND OPERATION

Section I. SERVICE UPON RECEIPT OF EQUIPMENT

2-2. Unpacking

2-1. Siting

WARNING

CAUTION

After unpacking boarding ladder,

The darkroom may be positioned by

cable adapter, ground rod and strap,

using a forklift. Forklift slots are

power cables, water hoses, and float,

located curbside and roadside (fig.

make certain that the three holddown

5-1). Make certain that the forks pass

rings are removed from the darkroom

completely under the darkroom and

floor (fig. 5-2).

extend through the three skids. The

darkroom may also be towed by

attaching cables to the tow rings.

a. Remove the lock (fig. 5-1), unlock and open the

entrance door.

a. Ground.

The darkroom site must be firm

ground, reasonably level, with good drainage

b. Remove the toolkit (fig. 5-2).

characteristics to carry off water waste. The darkroom

must be located within 40 feet of water, drain, and

c. Remove the air-conditioner covers (fig. 5-1),

electric power connections. The curbside must face the

and covers from the print processors and enlargers.

prevailing wind, so that the exhaust gas from the space

heater blows away from the darkroom. During summer

d. Remove the cover from the 5-gallon fuel can

operation, select a shaded site to decrease the solar

and dust cap from fuel strainer (fig. 1-13).

load on the air conditioners. The darkroom may be

leveled by inserting screwjacks under the jack pads.

The darkroom shall be checked with a spirit level in both

e. Unbolt and remove the easels (fig. 5-2).

the vertical and horizontal planes. If a spirit level is not

available, fill the large compartment of the processing

f. Unbolt the processing rack assemblies.

sink with water until the water level is adjacent to the

bottom of the small tank holder (TM 11-6740-286-12).

When the darkroom is level, the water will be evenly

g. Unbolt the cover from the diffusion transfer

distributed over the top surface of the small tank holder

equipment storage box.

(without small developing tanks). The site must be

convenient to airdrop or messenger service. If an

h. Unlock storage drawers 1 through 8 and the file

external source of water not under pressure is to be

cabinet drawers.

used, choose a site for the darkroom within 40 feet and

on the same level as the water source. The darkroom is

i. Unstrap and remove the boarding ladder, cable

equipped to lift a column of water to a maximum height

adapters, ground rod and strap, power cables, water

of 15 feet below the level of the water pump.

hoses, and float (fig. 1-11). Refer to paragraph 24d for

cable adapters and power cables required.

WARNING

Make certain that escape door will

j. Unstrap and remove the wastebasket and 3-

always open when darkroom is

gallon mixing pail (fig. 5-2).

secured to truck.

k. Unstrap the Ditto machine carrying case and

b. Vehicle. The darkroom is normally used when

typewriter. Remove the 12-inch safety trimmer.

mounted on a truck (fig. 5-1). The darkroom is

equipped with four lifting rings. The lifting rings with

sling assembly (fig. 2-1) provide the facility for loading

I. Remove the equipment stowed in the sink (fig.

and off-loading. Folding steps (fig. 5-1) provide access

1-12).

to the roof of the darkroom. Refer also to paragraph

311n or securing the darkroom to a truck.

2-1