AGFA Avantra 36/44, Service Manual, Page: 402 / 521

Section IV: On-line Processor
Functional Analysis 2-9
2.4 OLP Racks
Transport takes place through seperate sections called racks. They are the:
• Developer
• Fixer
• Wash and dryer
The racks are the most important parts of the processor. Each rack consists of
side plates with rollers driven by worms and gears to ensure an even and stable
transport.
2.4.1 Temperature Control
The temperature of the developer and fixer baths are controlled electronically to
obtain optimum developing results. Constant levels are maintained by means of
immersion heaters and circulation pumps.
2.4.2 Replenishment
Three types of automatic replenishment take place within the tanks:
• Automatic
• Timed
• Topping-up
A manual replenishment procedure also exist on the OLP. See below for a
description of the four replenishment functions.
2.4.2.1 Automatic Replenishment
Automatic replenishment keeps the concentration of developer and fixer
chemistries at a contant level. This procedure adds chemistry to compensate for
that lost during processing. A description of the procedure follows.
The processor pumps a constant 100cc of developer and fixer replenishment
liquid into the tanks. A calculation based on the preset replenishment value, the
area of the material, and the percentage density key determines the frequency
that the replenishment liquid is pumped.
When presetting replenishment values, the information included in the material
box as well as the information provided by the manufacturer of chemicals must
be referred to. When material is fed, the processor’s electronics calculate the
material width and length, which is detected by the film input switches.
2.4.2.2 Timed Replenishment
For chemistry replacement due to evaporation, the OLP has a built-in timer
replenishment system. Timed replenishment ensures a constant level of
developer and fixer 24 hours a day in both run and standby modes.