Troubleshooting guide for the Huawei G630-U00 handset, supplied as a 1.28 MB PDF; Tshoo in the name is short for troubleshooting. Documents like this usually present faults by symptom, for example power-on failure, charging, display, audio and network problems, with board photos marking the components and test points to check. A technician uses it to localise a fault before replacing parts. Open it in any PDF reader, and confirm the exact model and board version printed on the PCB before following the measurements.
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 @Schematics_Mobile. Enginerys does not host this file.
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How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.