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2. Place the thermocouple in a known, stable temperature environment (such as an ice bath, lag bath, or a dry well calibrator). 3. Allow the readings to stabilize. 4. In SETUP, change the offset until the primary display reading matches the bath temperature. (See "Changing Setup Options” in the 51/52 Series II Users Manual, and the 53/54 Series II Users Manual.) 51, 52, 53, 54 Series II Service Manual Basic Maintenance Basic maintenance required by the thermometer is discussed in this section. Cleaning the Thermometer Caution • To avoid damaging the thermometer, do not use aromatic hydrocarbons or chlorinated solvents for cleaning. These solutions react with the plastics used in the thermometer. • Do not allow the LCD to get wet. • Do not remove any of the lubricant from the battery/pca connection. Clean the thermometer case with a mild detergent and water. The pca may be washed with isopropyl alcohol or deionized water and a soft brush. Dry the pca with clean dry air at low pressure, then bake it at +50 oC (+122 oF) for 24 hours. Changing the Batteries WWarning • Replace the batteries as soon as the low battery indicator (B) appears. The possibility of false readings increases when the batteries are low. False readings can lead to personal injury. • To avoid electrical shock, disconnect the thermocouple(s) before opening the battery door. Caution • Do not attempt to recharge the batteries. • Do not dispose of the batteries by placing them in fire. • Follow local laws or regulations when disposing of batteries. • Match the positive (+) and negative (-) polarities of the batteries with the markings located on the case. To replace the batteries, refer to Figure 5 and use the following procedure: 1. Turn the thermometer off. 2. Loosen the battery compartment door screw and remove the battery door. 3. Replace the three AA batteries. To simplify battery installation, put the new batteries into the unit positive end first. 4. Replace the battery compartment door and tighten the screw. Thermometer Disassembly and Reassembly 13 zb01f.eps Figure 5. Battery Access Disassembly and Reassembly Disassembly and reassembly of the thermometer may be necessary to replace interior parts. Refer to Figure 6 when disassembling and reassembling the thermometer. Disassembly To disassemble the thermometer, follow these steps: 1. Remove the batteries (see “Changing the Batteries” section). 2. Remove the two screws located inside the battery compartment. Caution · Before proceeding, make sure that you are grounded to prevent static discharge, which could damage the thermometer. · Inside the unit there are parts that can become contaminated by oils from the skin. These parts should not be directly handled. When lifting out the elastomeric connectors and the main switch pad, it is recommended that tweezers or sterile gloves be used. 3. Remove the two case bottom screws, located at the LCD-end of the unit and separate the bottom case from the top case. 4. Removing any of the interior components of the unit requires removing the Main PCA. To remove the Main PCA, place the top case face down and remove the two screws that attach the Main PCA to the top case. Gently lift the Main PCA out of the top case. The IR Lens, small Isothermal PCA, backlight, elastomeric connectors, and the LCD may all lift out attached to the Main PCA. 5. If the Isothermal PCA separates from the Main PCA, the Isothermal PCA, IR Lens, backlight, elastomeric connectors, and the LCD will still be in the top case. Lift them out of the top case after the Main PCA is removed. 51, 52, 53, 54 Series II Service Manual 6. The LCD decal is now exposed and may be removed. 7. To remove the main switch pad, first remove the small elastomeric connector at the top of the switch pad, and then lift out the entire switch pad. Reassembly The reassembly procedure is basically the reverse of the disassembly procedure. However, there are several points in this process that should be explained further. Note For reassembly, the thermometer top case should be face down, with the keypad end of the top case facing the user. Reinstalling the LCD Assembly Follow these steps to reinstall the LCD assembly: 1. Install the LCD decal. 2. When putting the LCD back into the top case, make sure the LCD is correctly aligned. The edge of the LCD with the bubble in it should be facing the left side of the open, face down top case, and the LCD should be placed into the top case face down. 3. When reinstalling the backlight, the backlight pins should be on the left side of the open top case and they should be facing up. Check that the pins are straight. To make sure that the backlight is centered, line up the bottom left corner of the backlight with the guide that is molded into the top case. The left corner of the backlight should fit directly over this guide and the bottom right side of the backlight should also be lined up with (but not over) a similar guide on the right side of the open top case. 4. Ins...

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