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Pioneer SX-750

AM/FM Stereo Receiver

Pioneer SX-750

Specifications

Tuning range: FM, MW

Power output: 50 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 50kHz

Total harmonic distortion: 0.1%

Damping factor: 30

Input sensitivity: 5mV (mic), 2.5mV (MM), 150mV (DIN), 150mV (line)

Signal to noise ratio: 70dB (MM), 90dB (line)

Output: 150mV (line), 30mV (DIN)

Speaker load impedance: 4Ω (minimum)

Semiconductors: 1 x FET, 7 x IC, 42 x transistors, 40 x diodes

Dimensions: 480 x 149 x 371mm

Weight: 13.7kg

Accessories: FM T-type antenna

Downloads

service manual (en)

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Pioneer Receivers

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Submitted by jonwb

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Comments

re: SX-750

Is this receiver hard to keep up and running well? I just picked up one in good shape and am wondering if it was worth the money? Thanks!

SX-750 power switch bypass

After 37 years, the power switch on my SX-750 finally wore out. It's been inconsistent for the past few months and last night just refused to turn on. The switch is a Noble E35961. Anyone know where I might find a replacement? I'm afraid used ones may not have much life left in them either. In the mean time, I added a jumper wire from the unswitched AC line to the switched AC line on the rear of the unit. This has the effect of bypassing the rotary AC power switch and keeps the unit on.

re: SX-750 power switch bypass

Every time you turn on a high power stereo their is a big arc/spark on the points of the on/off switch.
This is because the HV (in this stereo 15,000 uf 50 vdc) filter caps on the power supply are totally discharged and at about .1 ohm ESR (effective series resistance) hence a big turn on surge current. It is best to always use a regular ac outlet switch in a strip to turn off & on your unit while leaving the stereos switch always on. These way the junk Chinese outlet strip gets the arc and not your stereo switch!
Doug8

re: SX-750

My unit cuts out once in a while. The relay clicks out and back in. I do not play it loud. It is not running hot. Any advice?

re: SX-750

Just got this manual. If not already fixed let me suggest. On the power amp assy AWH-046 their are two bias adjust pots VR1, VR2 they are in series with multi diodes D3, D4. turn these two pots all the way to the left. When pioneers get old, they seem to have output transistors, that after years of use, need less bias and turn on to hard, cause heating of outputs and after awhile, cause a voltage output offset, which the relay sense circuit sees this dc and clicks off. If bias (after doing this) is to low, with pots all the way to left, the audio will sound distorted, but only at low volume. Then you will have to crank up until distortion goes away. Turn balance control to left, while adjusting the left pot and right, for right channel pot. Usually VR1 and VR2 turned all the way left, after years of service works OK though. Also a speaker coil, that when a speaker moves out, hits the magnet, it shorts out the coil and unit sees a momentary short, which also cuts off the relay. This is rare and usually a scrapping woofer (If you push woofer in front with hand it scraps on magnet). Try disconnecting say right channel entire speaker, then crank up stereo and listen to left and see if cuts out. If not, unhook left and re-hook right, then crank up, to see if relay cuts out. Then you know it is a speaker for sure and on which side it is. Best of luck..............doug8

re: SX-750

Thanks for the service manual. You are a life savers!

re: SX-750

thx for the service manual!

Cheers!

re: SX-750

folly's picture

Thanks for this manual.

re: SX-750

Igor's picture

Thank you!

re: SX-750

Thanks

 

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