2-2 9845B/C Environmental, Installation, and Preventive Maintenance Requirements 9845B/C Installation Introduction The following pages cover installation, maintenance, and system testing for the HP 9845B and HP 9845C Desktop Computers. Where similar, the computers are referred to as the "System 45" or the "9845". Any differences between computers or models are noted when necessary. The following table shows the configuration for the model numbers which are referred to.
Monochromatic CRT (98750A) Monochromatic CRT With Enhanced Graphics (98780A) Color CRT (98770A) Standard Processor Enhanced Processor 98458 Model 100 98458 Model 200 9845C Model 100 9845C Model 200 There are other models which are based on the model numbers in the previous table. The 9845B Model 150, for instance, is a 9845B Model 100 with a thermal printer, two tape drives, graphics, and 187 K-bytes of read/write memory. For simplicity, this manual refers to Models 100 and 200 only. If you have a 9845B Model 150, just remember that your computer is referred to as the 9845B Model 100 in this manual.
Table Mounting The System 45 mainframe can be attached to a table top by replacing each foot with an internally threaded device and bolting up through the table top. Bolting the main frame to a desk which has a lockable drawer secures the computer from theft. Care must be taken in laying out the bolt holes so that the front edge of the computer overhangs the edge of the table top. This ensures that the air filters can still be removed and cleaned. The computer can be secured to the top of a table or desk in the following manner: Drill four holes in the top surface of a table to accommodate 5/16-24 NF-2A screws according to the following diagram.
• Replace the four rubber feet attached to the bottom of the computer with the four hex- agonal spacers supplied with the Table Mounting Accessory (P/N 09845-61201), using the 6-19X. 438 Pan Head, Pozidrive, Plastite screws, also supplied. • Attach the computer to the table top, using four 5/16-24 NF-2A machine screws that are 3/8 inch longer than the thickness of the table top. The hexagonal spacers should be held with a wrench while these screws are tightened to prevent stripping the smaller screws out of the plastic base. • The keyboard should extend 8.25 inches in front of the table top, as shown, to make the air filters accessible for periodic cleaning or replacement. NOTE:
ALL OIMENSIONS IN INCHES 1.25 ~ ______________ 1 FRONT