FAQ
TL;DR: Fix no-sound by a 3-step setup using 1 cable: “connect the phone’s output to the tower’s input.” Select AUX and play. [Elektroda, DejoDejo, post #16863173]
Why it matters: This FAQ helps Technics SH-EH750 owners quickly connect a phone to AUX and troubleshoot silent playback.
Quick Facts
- Required lead: 3.5 mm mini-jack (phone) to 2×RCA “chinch” (tower) cable; widely available. [Elektroda, KOCUREK1970, post #16871129]
- Use the rear AUX IN RCA jacks, not the front headphone jack. [Elektroda, sylweksylwina, post #16862833]
- After wiring, set the source to AUX on the remote/front panel. [Elektroda, KOCUREK1970, post #16871129]
- TRS (3‑pole) vs TRRS (4‑pole) headset leads can cause detection issues; use a plain stereo output lead. [Elektroda, DejoDejo, post #16862745]
- Output‑to‑output (phone headphones → tower headphones) yields silence; route output to input only. [Elektroda, DejoDejo, post #16863173]
How do I connect my phone to a Technics SH‑EH750 and get sound?
Use a 3.5 mm to 2×RCA cable. 1) Plug 3.5 mm into the phone. 2) Plug RCA L/R into the rear AUX IN. 3) Select AUX on the Technics and press Play on the phone. [Elektroda, KOCUREK1970, post #16871129]
Which exact cable do I need and what is it called?
You need a “mini‑jack to 2 chinches” (3.5 mm TRS male to 2×RCA male) stereo audio cable. Ask for “3.5 mm to RCA L/R.” [Elektroda, sylweksylwina, post #16862903]
Where do I plug it in on the tower?
Use the rear-panel AUX IN RCA sockets. Do not use the front headphone jack, which is an output. [Elektroda, sylweksylwina, post #16862833]
I switched the source to AUX but still hear nothing—what should I check?
Confirm the cable works and the phone’s headphone output is active using a headphone test. Re-seat plugs firmly. [Elektroda, sylweksylwina, post #16862741]
Can I use the tower’s front headphone jack as an input?
No. The headphone jack is an output. “Output to output” connections do not pass audio to speakers. [Elektroda, DejoDejo, post #16863173]
Will a headset (TRRS) cable from my phone work in AUX?
Headset TRRS plugs can misalign contacts and fail. Use a plain stereo TRS lead for reliable line output. [Elektroda, DejoDejo, post #16862745]
How do I change the input to AUX on the Technics SH‑EH750?
After wiring, press INPUT/SELECT on the unit or remote and choose AUX. Then start playback on the phone. [Elektroda, KOCUREK1970, post #16871129]
Will a 3.5 mm–to–3.5 mm cable work instead of RCA?
No. The SH‑EH750 expects RCA on AUX IN, and its 3.5 mm jack is a headphone output, not an input. [Elektroda, sylweksylwina, post #16862903]
Why do I hear music on my phone but nothing from the speakers?
You likely connected to the tower’s headphone output or the wrong input. Route phone OUT to tower IN. [Elektroda, DejoDejo, post #16863173]
Is the AUX input stereo or mono?
Stereo. The two RCA connectors carry left and right channels (2 channels). [Elektroda, KOCUREK1970, post #16871129]
What does AUX mean on this system?
AUX is the rear line‑level input pair labeled AUX IN. Select it to hear external sources. [Elektroda, sylweksylwina, post #16862833]
How can I quickly isolate a bad cable or phone jack?
Plug headphones into the phone to confirm output. If headphones work, swap the RCA cable for another. [Elektroda, sylweksylwina, post #16862741]
