Ohms (+ 10%)
(n) It is unlikely that a temperature dial will fail or cause a problem.
However, a worn swing contactor could cause the temperature dial to not set the
temperature properly. You can check this by disconnecting the power, removing the J3
PC board, removing the potentiometer box and checking it with an ohmmeter.
Resistance across the two leads should vary smoothly from 0 to 2500 ohms, as you turn
(7) Check the replenishment system. The replenishment system operates
in two switch-selectable modes. The mode switch is switch S1 on the timing PC board
J2. See figure 1-16. In the high volume mode, replenishment occurs while film being
fed into the machine depresses the film switch. In the low volume mode, replenishment
occurs not only when film depresses the film switch, but also whenever there is a jog
cycle. This mode is intended to prevent chemistry stagnation from a lack of use. In
both modes, replenishment occurs if the developer solution falls below the level probes,
and for 30 seconds after the solution is up to the probe level.
(a) Check for proper pump activation. To check for proper operation in
the high volume mode, press the film switch and observe the pump. Also observe led
DS3 on the J2 PC board, which is the pump run signal. The pump should run when you
press the switch and stop when you release the switch. In the low volume mode, check
that the pump runs during the jog cycle (9 seconds every 3 minutes), as well as when
you press the switch. If DS3 lights but the pump does not run, the problem is probably
in fuse F2, relay K1, or the pump.