AFP Imaging Mini-Medical Series, Installation, Operation & Service Parts Manual

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Service
Mini Med Series
0000061122
Service Procedure 5-4
Circuit Descriptions &
Calibration Procedures,
(Cont'd)
Developer Temperature Calibration
1. Verify that there is enough conductive liquid in the developer tank to cover the low
level sensor, located in the front wall of the tank. (About 1.5 gallons [6 L.])
2. Turn the processor ON.
3. Rotate trim pot R-20 on the Logic Board several turns clockwise to force the heater
ON. The DEV HEAT LED and LED L-2 must be on steady, if not, continue turning R-
20 clockwise until both LEDs’ are ON steady.
4. Place a known accurate metal stem thermometer into the developer solution.
CAUTION: Do Not use a glass/mercury thermometer in the processor. If a glass
thermometer should break, the resultant mercury leakage would permanently
contaminate the processor.
5. As the temperature of the solution reaches the desired value, slowly adjust trim pot
R-20 counterclockwise until LED L-2 starts to blink. When the desired temperature is
reached the LED should flash ON only occasionally to indicate temperature is being
maintained.
Dryer Temperature Control
The dryer uses two 275 watt infra-red lamps (heaters), and airflow provided by 2 fans,
to dry the film as it passes through the dryer section.
A thermistor in the dryer section is used as a temperature sensor. Control is provided
by the logic board. LED L-1 on the logic board will light when the dryer is calling for
heat.
The temperature controller signals the Triac switch Q-1 through opto-isolator U-l on
the AC interface board. The triac switches line voltage to the heaters.
Trim pot R-21 on the logic board adjusts the set temperature of the dryer.
NOTE: Counterclockwise rotation of the trim pot increases the set temperature of the
dryer.
The upper dryer blower is controlled by opto-isolator U-3 and triac Q-3. The lower, or
back blower is on continuously
5-14