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General
These instructions cover the replacement of the display assembly in the following instrument models: 7050; 7050i;
7250; 7250i; 7250xi; 7250LP; 7252; 7252i; and 7750.
These instruments are of modular construction, consisting of one or two primary sensors (depending on model type),
a pneumatic control system, an electronic control system, and a power supply.
Figure 1 shows the general layout of the various components within the instrument chassis as viewed from the top
(Model 7750i shown).
Access to the components is gained by removing the top cover.
Electronic
Control Module
PN
December 2010
©2010 Fluke Corporation. All rights reserved. Printed in USA.
All product names are trademark of their respective companies.
Pneumatic
Control Module
INS-H0001
LCD Display Upgrade
Upgrade Instructions
Power
Supply
Primary
Sensors
gnk01.eps
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Summary of Contents for Fluke Calibration 7050
- Page 1 Upgrade Instructions General These instructions cover the replacement of the display assembly in the following instrument models: 7050; 7050i; 7250; 7250i; 7250xi; 7250LP; 7252; 7252i; and 7750. These instruments are of modular construction, consisting of one or two primary sensors (depending on model type), a pneumatic control system, an electronic control system, and a power supply.
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Page 2: Kit Contents
INS-H0001 LCD Display Upgrade Figure 1. Internal Arrangement (7750i) Kit Contents The Display Upgrade Kit (part number 7250-116-A) consists of the display assembly, a power cable and these instructions. W Caution The original instrument configuration drives the display with 12 VDC, but the new display operates on 5 VDC. -
Page 3: Top Cover Removal
INS-H0001 LCD Display Upgrade Procedure Top cover Removal 1. Remove the 4 screws securing the top panel to the enclosure. 2. Push the top cover towards the rear of the instrument, and lift clear. gnk02.bmp Figure 2. Top Cover Removal... - Page 4 INS-H0001 LCD Display Upgrade Primary Sensor Removal General With instruments that have two primary sensors, it is important to ensure that they are refitted in their original positions to avoid damage to the sensors. Therefore, it is good practice to make careful note of their respective positions and pneumatic and electrical connections BEFORE removal from the instrument chassis.
- Page 5 INS-H0001 LCD Display Upgrade User Interface Panel Removal 1. Turn the chassis back to rest on its rubber feet. 2. Remove the six nuts and lock washers that hold the interface panel. 3. Tilt the panel and disconnect electrical cables from the keyboard and the display. 4.
- Page 6 INS-H0001 LCD Display Upgrade Replacing Display Assembly 1. Unscrew four screws ad lock washers, remove P-clip and lift out display assembly. 2. Locate new display assembly in cutout in user interface panel, with PCA assemblies toward the lower edge. 3. Refit four screws and lock washer, with P-clip fitted to lower right-hand side mounting point —...
- Page 7 INS-H0001 LCD Display Upgrade Re-assembly 1. Feed new display backlight cable (blue/black twisted pair) through slot in front panel of chassis, and connect to the mating connector (marked DISP) on the motherboard. 2. Connect the cables from the instrument chassis to the keyboard and display. 3.
- Page 8 INS-H0001 LCD Display Upgrade...