shutter switch to release it from the lensboard side frame (1).
4-15. Counter Safety Lights
Disconnect wires from terminals of shutter switch. Remove
shutter switch, being careful not to break wire leads.
a. Counter Safety Light Receptacle, Darkroom Side.
b. Installation. Connect loose wires to shutter switch
(1) Removal. Remove the cover plate (3, fig. 4-1)
(2). Attach shutter switch to nipple (3) with locknut (6).
Connect the shutter switch with two screws. Position the
(8) to release the counter safety light receptacle (9).
cover plate on shutter switch, and retain with two screws (8).
(2) Installation. Attach the counter safety light
receptacle (9) with two screws (8). Attach loose wires to
terminals, and install cover plate.
b. Counter Safety Light Switch, Darkroom Side.
(1) Removal. Remove the cover plate (3, fig. 4-
terminals. Loosen locknut (2) and remove counter safety light
switch (1) from cover plate (3).
(2) Installation. Position switch (1) on cover plate
(3), and secure with locknut (2). Connect wire leads to
terminals. Install the cover plate.
4-16. Vacuum back Valve Handle
. Tap taper pin from valve handle (13, fig.
1-4), and remove from the vacuum back valve housing (1).
b. Installation. Place valve handle (13) on vacuum back
housing (1), and retain with taper pin.
4-17. Darkroom Arc Lamp Switch and Lensboard Arc
a. Description. The darkroom arc lamp switch (1ii 1,
identical switches and serve the same function.
switches are similarly installed.
. Remove screws (13, fig. 4-2)
switch cover (12) from darkroom arc lamp switch (11).
Disconnect wires from switch terminals.
Figure 4-3. Lensboard shutter switch and arc lamp
mounting screws to release switch (11).
c. Installation. Connect loose wire leads to switch, and
install with four mounting screws. Place switch cover (12) on
4-20. Darkroom Shutter Switch
switch and retain with screws (13).
. Loosen screws (15, fig. 4-2)
4-18. Copyboard Vacuum Operating Knob
outlet box cover (16). Remove two mounting screws to
release the shutter switch from the outlet box. Disconnect two
wire leads to free shutter switch from outlet box.
a. Removal. Insert Allen wrench in hole of
operating knob (7, fig. 1-6), and loosen setscrew.
b. Installation. Replace the shutter switch with two
Remove operating knob from copyboard.
screws. Connect two loose wire leads of outlet box to shutter
switch. Replace cover on outlet box with screws (15).
b. Installation. Place the operating knob (7) on shaft
protruding from copyboard, ascertaining that indicator
corresponds to correct vacuum zone size. Tighten setscrew
4-21. Lensboard Arc Lamp Switch
inside the operating knob.
. Remove screws (7, fig. 4-3)
cover plate from arc lamp switch (4). Disconnect two wire
4-19. Lensboard shutter switch
leads from switch terminals. Remove two screws on inside of
switch to release it from board side frame (1). Loosen locknut
(6) on the nipple (5) and remove switch.
. Remove two screws (8, fig. 4-3)
cover plate from lensboard shutter switch (2). Loosen locknut
(6) to disconnect switch from nipple (3) attached to the
adjacent arc lamp switch (4). Remove two screws inside the