Philips M3921A Service Manual page 97

Chapter 6 - Disassembly Guide
5. Carefully slide the battery housing from the rear case assembly.
6. Disconnect the speaker twisted-pair-connector from the power supply
PCB. The speaker is mounted on one side of the battery housing.
7. If a recorder is installed, disconnect the ribbon cable from the recorder
PCB. The recorder PCB can be removed by removing the four screws
fastening the PCB to the battery housing.
Disassembly Procedures (A3)
Screws fastening battery housing
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