Timer

c. Timer PH-426-(*) (figs. 18 and 19).

Control or indicator

Function

TIME-FOCUS switch

In FOCUS position keeps enlarger lamp on for indefinite period. In TIME

position keeps enlarger lamp on for preset period.

PUSH-button switch (START

When pushed in, starts interval timer operation for preset time period.

CYCLE switch on PH-426-C).

Indicator pointer

Indicates passing of preset interval.

Pointer

Indicates number of seconds to which unit is set.

Pointer knob (part of pointer on

Used to set interval timer to desired time interval.

PH-426-C).

STOP-TIMING switch (PH-426C

In STOP position stops timing cycle. In TIMING position continues timing

only).

cycle.

d. Interval Timer FN-5(1) (fig. 20).

Control or indicator

Function

TIME-STOP TIMING FOCUS

In TIME position permits automatic timing cycle. In STOP TIMING position

toggle switch.

turns off the projection lamp. In FOCUS position turns on projection lamp

START CYCLE push button

Starts automatic timing of exposure when pushed down.

Time selector knob

Sets indicator pointer to desired time interval.

Indicator pointer

Indicates time interval selected.

Progress pointer

Indicates time left before time interval has elapsed.

TM405-10-36

Figure 18. Timer PH-426 or PH-426-A.

AGO 6894A