Grundig Satellit 750 Service Manual [2021]

Inject a highly accurate 55.845 MHz signal into the first IF test input.

[Antenna Input] ---> [RF Attenuator / Pre-selector] ---> [1st Mixer] ---> [55.845 MHz IF Filter] | [Local Oscillator 1 (PLL)] | [Audio Output] <--- [Demodulator / AM / SSB / FM] <--- [2nd Mixer] <--- [455 kHz IF Filter] | [Local Oscillator 2 (55.390 MHz)] The RF Front-End and First Mixer grundig satellit 750 service manual

| Problem | Symptoms | Community Solutions | | :--- | :--- | :--- | | | The main tuning knob is loose or falls off easily. | - Place a tiny piece of paper (like onionskin) on the shaft as a shim to increase friction. - Melt a small spot on the inside of the knob with a soldering iron to create raised edges for grip. | | Performance Issues | - The "S" meter stays pinned full-scale on FM. - Longwave (LW) and Medium Wave (MW) bands are nearly dead unless attenuation is set to -10dB. - The receiver reads 1 kHz high on shortwave bands (off frequency). | - The off-frequency issue is common. There is no simple reset or adjustment for this. - A full alignment may be needed to resolve the issue. The solution involves replacing the stock filters with matched ones and performing a complete alignment. - Alignment procedures might be found in similar repair guides for related models (e.g., the Satellit 700). | | Battery / Corrosion | Corrosion or rust found on battery terminals or along the bottom of the radio. | - Use a plastic cleaner and a soft cloth for external grime. - Clean corrosion from the battery compartment with alcohol and a toothbrush . - For heavy rust, remove the rear cover and use fine sandpaper or a file, then apply Naval Jelly or a thin film of Vaseline to protect bare metal. - Use only high-quality alkaline batteries to minimize future leakage. | Inject a highly accurate 55

Gently pull off the main tuning knob, volume knob, and minor control knobs. Some production runs use a tiny hex screw inside the side of the main knob; check for this before pulling. - Melt a small spot on the inside

Which (AM, FM, SW, or Air) is giving you trouble?

Includes a 360-degree rotating AM ferrite antenna and a telescopic whip for SW/FM. Maintenance & Troubleshooting Guide