Kt-7900d Service Manual — Qyt

: Since the radio is FCC-certified, you can view high-resolution photos of the internal circuit boards on FCCID.io , which can help identify components. Troubleshooting & Technical Insights

Yes. Look for “QYT KT-7900D Service Manual V1.1 EN”. Many forum users have translated the critical sections (alignment tables). If you have the Chinese PDF, use Google Translate’s “Document” upload feature. qyt kt-7900d service manual

| Step | Function | Test Equipment | Adjustment Point | Target Value | |------|--------------------|--------------------------|------------------|-----------------------| | 1 | Ref Frequency | Frequency counter | TCXO trimmer | ±200 Hz at 145.000 | | 2 | RX Sensitivity | Signal generator, SINAD | Tuning coils Lx | 0.25 µV for 12 dB SINAD| | 3 | TX Power High | Power meter, dummy load | Pot VR1 | 25W ± 1W | | 4 | TX Power Mid | Power meter, dummy load | Pot VR2 | 15W ± 1W | | 5 | Modulation Dev | Deviation meter | Pot VR3 | ±2.5 kHz at 1 kHz tone| | 6 | Squelch Threshold | Signal generator | Pot VR4 | 0.25 µV to close | : Since the radio is FCC-certified, you can