Kenwood tk-790 issues

[hamscanner65]

Howdy im having lots of trouble hear i have tried multiple different pins my radio is a Kenwood tk 790 and the microphone works it was used as a old fire dept radio but ive tried putting the head back together but nothing not burnt inside the radio ive tried sql but it doesnt make any beeps or anything

 

[ramal121]

Sorry, but you have no speaker audio, is that what you are asking about? Use pins 2 and 6 on the back of the radio white connector.

 

[n7maq-1]

Are you trying to get audio out of the back of the head? If so make sure the jumper on the rear of the radio is in place, if not you will not get audio out. The correct pins on the head would be 10 and 11.

 

[KD9RTX]

Uh, punctuation is your friend? Also, the jumper thing.

 

[buddrousa]

I do remember having to do something to the 790's when I did the remote head and dual heads when I did the 790 installs 25 plus years ago.
The Kenwood TK-790 may have no speaker audio due to several common issues: incorrect wiring, missing jumpers, misconfigured settings, or muted speaker functions. For dual head configurations, speaker audio can be muted from the control head, so ensure the mute function is not accidentally activated and double-check head number displays for any mute icons.

Common Troubleshooting Steps​

• Check the 9-pin Molex Connector: Proper pinning and connector installation is necessary. Specifically, on setups with remote heads, pins 3 and 6 should be jumpered to enable speaker audio via the control head. Failure to do this can result in no speaker output.
• Verify Speaker and Jumper Wiring: Ensure that both internal and external speakers (such as KES-5) are connected properly, and jumpers are correctly installed.
• Speaker Mute and Squelch: Use the control head buttons to check if the speaker is muted or squelch is set too high. The mute function and squelch levels are both set with panel keys and confirmed via tones and display indicators.
• Configuration Settings: For advanced connections (like using accessory ports or mics), ensure the DB-25 connector and related settings (such as enabling Ext PTT) are properly programmed.

Additional Notes​

• When using remote heads or accessories, consult the service manual pinout diagrams and ensure all connections match the intended configuration for speaker output.
• Power supply issues can also contribute to audio problems; confirming battery connections and charge guard functions is recommended.

If these steps do not resolve the audio issue, consider reviewing the service manual for further troubleshooting and detailed wiring schematics, or check for component failures such as blown fuses or defective speakers.