T800/T800 SERIES 2 MANUALS/M820 00 2A0/Pages A2 1 4 Pages
T800/T800 SERIES 2 MANUALS/M820-00-2A0/Pages A2-1-A2-4 Pages A2-1-A2-4
T800/T800 SERIES 2 MANUALS/M820-00-2A0/Pages A2-1-A2-4 Pages A2-1-A2-4
User Manual: Pdf T800/T800 SERIES 2 MANUALS/M820-00-2A0/Pages A2-1-A2-4
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Mechanical M820-00 2 Mechanical 2.1 Torx Recess Head Screws A2.1 Torx recess head screws are becoming the standard screw head type in all T800 Series II equipment, with Pozidriv and Philips recess head screws being used in fewer applications. The Torx recess head has the advantage of improved screwdriver tip location, reducing the chances of screw head damage caused by the driver tip rotating within the recess. In addition, using a ball-tip Torx screwdriver allows you to drive a Torx head screw with the driver on a slight angle, which can be useful in situations where access is restricted. It is important that you use the correct Torx screwdriver tip: M3 screws M4 screws - T10 T20. Figure 2.1 below shows a typical Torx recess head screw (actual hardware may differ slightly from this illustration due to variations in manufacturing techniques). "star" shaped recess with six internal notches Figure 2.1 Torx Screw Identification Copyright TEL 01/07/00 A2.2 Mechanical 2.2 Pozidriv & Philips Recess Head Screws M820-00 Pozidriv and Philips recess head screws will continue to be used in T800 Series II equipment in a few special applications. It is important that you use the correct type and size screwdriver for each screw type to avoid damaging the screw head. It is particularly important that you do not use Philips screwdrivers on Pozidriv screw heads as the tapered driving flutes of the Philips screwdriver do not engage correctly with the parallel-sided slots in the Pozidriv screw head. This can result in considerable damage to the screw head if the screwdriver tip turns inside the recess. Note: If you find you need excessive downwards pressure to keep the screwdriver tip in the Pozidriv screw head, you are probably using the wrong type and/ or size screwdriver. Figure 2.2 below shows the main differences between typical Pozidriv and Philips screw heads and screwdriver tips (actual hardware may differ slightly from these illustrations due to variations in manufacturing techniques). Pozidriv Philips internal notches no special markings "star" markings between slots slots with parallel sides slots with tapered sides driving flutes with parallel sides driving flutes with tapered sides ridges between driving flutes Figure 2.2 Pozidriv & Philips Screw & Screwdriver Identification 01/07/00 Copyright TEL Mechanical M820-00 2.3 Disassembly/Reassembly 2.3.1 Receivers/Exciters/Transmitters A2.3 To carry out alignment or change option links, you need to remove only the top cover, i.e. the one adjacent to the front panel handle and on the opposite side to the main D-range connector (D-range 1/PL100). You need to remove the bottom cover to: • access transmitter RF power transistors and many SMD components • change solder blob links • fit test leads to circuit block access points. 2.3.2 Power Amplifiers You should carry out the tuning and power output level setting procedures with the cover on. 2.4 Cover Screw Torques Receivers/Exciters/Transmitters .. 1.36Nm/12in.lbf. Power Amplifiers .. 0.9Nm/8in.lbf. Copyright TEL 01/07/00 A2.4 Mechanical 2.5 Chassis & Cover Compatibility M820-00 The chassis and covers used in T800 Series II modules incorporate a number of design changes to improve Electro-Magnetic Compatibility (EMC) performance. It is important that only the new-design covers are fitted to the new chassis to ensure correct mechanical fit and continued compliance with appropriate EMC Type Approval regulations. Figure 2.3 below shows some of the main features which can be used to identify the new-design chassis and covers. Chassis ←Top View Rear View→ 4 holes in rear panel loom channel in top of walls groove in top of rear wall Top Cover provision for mounting speaker (future development) ridge on top of rear wall Bottom Cover additional walls Figure 2.3 Identification Of New-Design Chassis & Covers 01/07/00 Copyright TEL
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