Qyt Kt-7900d Service Manual Guide

Bad internal speaker; blown audio amplifier IC; dirty external speaker jack internal contacts.

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Before opening the chassis, it is vital to understand the operating parameters of the KT-7900D. Operating outside these parameters during testing can damage the final amplifier stage. VHF: 136–174MHz (Rx/Tx) 220: 220–260MHz (Rx/Tx) UHF: 400–480MHz (Rx/Tx) Sub-bands: 350–390MHz (Rx/Tx) Output Power: VHF: Max 25W / Low 20W UHF: Max 20W / Low 15W Modulation: F3E (FM) Antenna Impedance: 50 Ohms Supply Voltage: 13.8V DC (±15%), negative ground Bad internal speaker; blown audio amplifier IC; dirty

If no manual exists, some hams have traced the PCB and created their own schematics. Search GitHub or Hackaday for “KT-7900D schematic.” I'll search for information about the QYT KT-7900D