Audio Fix / setup help

Marantz STEREO 70s: restore an intentionally hidden input selector

Marantz STEREO 70s — restore an intentionally hidden input selector. Follow the exact documented route and keep the actual result.

Manufacturer-documented Reviewed 2026-11-09 · Revision 1

Follow these checks in Audio Fix →

When this guide applies

Exact Marantz STEREO 70s. Known connected source missing from the input list; no input assignment reset. Only normal external user controls; no mains modification, chassis opening, reset or firmware installation.

Connection scope: Device controls / power only. Symptom: An option or codec is missing.

This is a documented check, not a diagnosis of your equipment. The model name does not confirm the selected input, mode, software or connected partner.

If your exact model or a required setting is unknown, use the “I don’t know” branch below. Do not apply a similarly named model’s instructions.

Checks and possible outcomes

Start at scope. Follow the link that matches what you actually observe. Alternative branches are not a single sequence of actions.

scope

Confirm the exact setup

The actual missing source is known and its Hide Sources value is positively Hide. The owner accepts making this source visible again.

Look for: Choose only a detail you can confirm.

  • Manufacturer-documented Marantz STEREO 70s official Owner’s Manual ↗PDF page 150: Hide Sources — Setup Inputs > Hide Sources marks an input Show or Hide. Hide removes an unused source from the selection display; it does not change physical wiring or decode support.Exact Marantz STEREO 70s EU English manual. This guide does not substitute another receiver/amplifier’s buttons, menu or supported formats. · Source checked 2026-11-09

a1

Open Setup > Inputs > Hide Sources

Locate the exact missing source, rather than resetting all names/assignments.

Look for: Perform this one check and observe the actual response.

  • Manufacturer-documented Marantz STEREO 70s official Owner’s Manual ↗PDF page 150: Hide Sources — Setup Inputs > Hide Sources marks an input Show or Hide. Hide removes an unused source from the selection display; it does not change physical wiring or decode support.Exact Marantz STEREO 70s EU English manual. This guide does not substitute another receiver/amplifier’s buttons, menu or supported formats. · Source checked 2026-11-09

a2

Set that source from Hide to Show

Leave other household inputs unchanged.

Look for: Perform this one check and observe the actual response.

  • Manufacturer-documented Marantz STEREO 70s official Owner’s Manual ↗PDF page 150: Hide Sources — Setup Inputs > Hide Sources marks an input Show or Hide. Hide removes an unused source from the selection display; it does not change physical wiring or decode support.Exact Marantz STEREO 70s EU English manual. This guide does not substitute another receiver/amplifier’s buttons, menu or supported formats. · Source checked 2026-11-09

a3

Inspect the normal source-selection display

Confirm the intended source is visible before selecting it at low level.

Look for: Perform this one check and observe the actual response.

  • Manufacturer-documented Marantz STEREO 70s official Owner’s Manual ↗PDF page 150: Hide Sources — Setup Inputs > Hide Sources marks an input Show or Hide. Hide removes an unused source from the selection display; it does not change physical wiring or decode support.Exact Marantz STEREO 70s EU English manual. This guide does not substitute another receiver/amplifier’s buttons, menu or supported formats. · Source checked 2026-11-09

result

Check the actual result

Is the intended input visible again?

Look for: Choose only a detail you can confirm.

  • Manufacturer-documented Marantz STEREO 70s official Owner’s Manual ↗PDF page 150: Hide Sources — Setup Inputs > Hide Sources marks an input Show or Hide. Hide removes an unused source from the selection display; it does not change physical wiring or decode support.Exact Marantz STEREO 70s EU English manual. This guide does not substitute another receiver/amplifier’s buttons, menu or supported formats. · Source checked 2026-11-09

Possible result

Confirm the unknown detail first

Do not infer a source setting, installed cartridge, connector role, software state or partner capability. Obtain the exact documentation before continuing.

insufficient data

Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.

    Possible result

    Keep the actual observation for support

    Record the exact model, source, input and last observed response. These checks do not diagnose a failed component. No reset, service work or blind update is prescribed.

    next support

    Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.

      Possible result

      Checks completed — keep the observed result

      This records the observation in this particular setup, not a guaranteed cure, physical Audio Review test or measurement.

      steps completed

      Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.

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