PDF schematic covering the microphone, loudspeaker and earpiece circuits of a handset, from a sectioned series of roughly 4.78 MB pages without a model in the name. Expect the audio codec connections, amplifier for the speaker, earpiece driver lines and microphone bias, plus filter components. It is used to locate the parts behind silent calls, a dead loudspeaker or poor mic pickup and to find measuring points along each audio path. Confirm it matches the phone being repaired before trusting the parts list.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @phoneSchematics. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.