Input Unit Assembly Replacement; Top Cover Assembly Replacement - Philips SCOPEMETER PM93 Service Manual

7 - 48 CORRECTIVE MAINTENANCE
7.2.5.6 Input unit assembly replacement
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Figure 7. 14 Input unit assembly
Referring to figure 7.14, use the following procedure for input unit assembly replacement.
1 . Remove the front cover assembly.
2. Disassemble the bottom cover assembly.
3. Remove the 30-pole flat cable.
4. Unsolder the wiring (6x) of the input terminals from the analog A2 PCB.
5. The input unit assembly is clamped onto the analog A2 PCB. Loosen these clamps and pull the
input unit assembly from the analog A2 PCB.
NOTE: The white gaskets on the input terminals (4x) are sealed to, and must remain with the input
unit assembly. Do not damage the gaskets and do not separate them from the input unit
assembly. Correctly fitted gaskets assure the sealing of the ScopeMeter.
6. Reinstall the front unit assembly.
7.2.5.7 Top cover assembly replacement
Referring to figure 7.12, use the following procedure for top cover assembly replacement.
1. Remove the bottom cover assembly.
2. Remove the 30-pole flat cable.
3. The digital A 1 PCB and metal screening are secured to the top cover with four M3 Torx screws
(item 33). Two of these screws contain standoffs. be sure to put them on the right place again.
Use a Torx screwdriver to remove the screws.
4. Remove the metal A 1 screening from the digital A 1 PCB.
5. Lift the digital A 1 PCB out of the top cover. Be careful not to damage the infrared LED and
phototransistor of the optical interface.