(4) Check FEED indicator and audible signal timing. Check that the FEED
indicator lights after 2 1/2 seconds and that there is an audible "beep" signal. The feed
signal timer starts counting as soon as you release the film switch. It counts 2 1/2
seconds and then turns on the TEMP/FEED indicator and sounds the audible "beep"
signal. The TEMP/FEED indicator will not light if there is insufficient developer in the
rack, if the developer and/or dryer have not reached temperature, or if the film switch is
actuated.
(a) If the TEMP/FEED indicator functions, but the audible signal does
not, it is likely that the signal is faulty. Disconnect the leads to the audible signal and
hook a penlight battery or an ohmmeter with a 1.5v (volt) battery to the audible signal.
Observe polarity. The signal should emit a humming sound.
(b) If the audible signal functions, but the TEMP/FEED indicator does
not, it is probably due to a burned-out bulb.
(c) If the audible signal is producing a faint constant beeping sound,
the power supply voltage is incorrect. The supply voltage must be within 6 percent of
115vac or 220vac. If you are configured for 220vac operation, it may be necessary to
change the transformer output tap. Check with a voltmeter and adjust accordingly.
(d) Failure of the TEMP/FEED indicator to light after a sufficient warm-
up time should be diagnosed by using the following procedure. The components in the
feed and timing circuit are shown in figure 1-19. The procedure for checking the cause
of unusually slow warm-up is the same. If there is insufficient developer, see the
following paragraph (e). If the developer has not reach temperature, see the following
paragraph (f). If the dryer has not reached temperature, see the following paragraph
(g). If the film switch is activated, see the following paragraph (h).
(e) If there is insufficient developer, remove the top cover and check
the solution levels. If the developer is below the level detector probes, the replenisher
pump should be running. It should continue to run for 30 seconds after the solution
level reaches the detector. If the pump is not running, refer to replenishment system
below, paragraph (7). If the pump is running and replenisher is being added, but it does
not raise the solution level in the tank, the tank is leaking or draining. Check all fittings
to make sure they are not leaking solution. Refer to diagnosing leaks, paragraph 1-
4a(7)(f). If there is sufficient developer, but the replenisher pump is still running, the
level detector is not working.
(f) If the developer has not reached temperature, check the
temperature with a process thermometer. If there is no heating, refer to temperature
control, paragraph (6) below. If the replenisher pump is still running, the problem could
be the developer level detector. If the thermometer shows that the solution is being
heated, check for adequate circulation. Also check the water temperature and ambient
(overnight) air temperature. Room temperature and extremes in incoming water
temperature can inhibit warm-up.
MD0359
1-27
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