The Delco UX1 radio cassette I have (Blaupunkt 4-button cassette unit) needs a new optical sensor.



When it doesn't work properly it looks like motor has stopped to the "brains" of the unit.
The unit then thinks it's reached the end of tape and reverses back and forth before ejecting tape.
The part from Blaupunkt is not easy to find.

But here is a way to test and repair it.



The Blaupunkt unit schematics/wiring diagrams shown are here:
https://www.radiomuseum.org...r_23_7642888170.html

Of course, Honeywell discontinued part number HCL1395 a couple of years ago, so hard to find.

Reading through the comments under the video, it's apparent that Everlight ITR20904 also works.
https://www.alldatasheet.co...RLIGHT/ITR20904.html

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[This message has been edited by fierosound (edited 05-15-2022).]

More DIY on the cassette mechanisms.
http://www.gnttype.org/tech...ges/tape_player.html
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Cassette drive belts...
GM/Delco Autosound Cassette Players 1980 thru mid-1990's made in 4 styles.
(1) Non-auto reverse models use SBX7.4
(2) Auto reverse Fijitsu 3 (Mechanical) Button Mechanisms use SBS8.6
(3) Auto reverse Blaupunkt 4-button Mechanisms use 2 belts: AV-SBS4.9 & AV-SBS9.2
(4)Pioneer (88 up) and Alpine Mechanisms (91 up) have electronic switch buttons SBS9.2
http://kenselectronics.com/lists/belts.htm#Auto

On Blaupunkt units, the Pulse Generator Disk (Delco PN 1226632) is sometimes the culprit.
https://www.ebay.com/itm/De...ng-Disc/124095797548

[This message has been edited by fierosound (edited 09-04-2020).]

[This message has been edited by fierosound (edited 05-15-2022).]

[This message has been edited by fierosound (edited 09-07-2020).]

quote Originally posted by fierosound: Here's a Delco item that looks like it is the correct part (but shipping to Canada is ridiculous) GM Delco 90-95 Type D 2000 Series Cassette Deck Light Sensor Assy 1229219 NIB https://www.ebay.com/itm/GM...19-NIB-/262385753000

Delco radio cassette fixed!
Above part is correct for our Delco radios with Blaupunkt cassette units.



New sensor is on right with "ribbon cable" instead of separate wires and is identical.
Repair was done as per video in first post.



Sensor snaps into unit exactly as it should.



Biggest part of job is removing old sensor and fishing new wires through and soldering them.
This new sensor wiring had a clip on the end that wasn't needed and was cut off.

Red-Yellow-Green
becomes
White-Yellow-White/Red stripe (new sensor)



Success! Cassette plays great!
AutoReverse, FF, REW, Eject and Power Off Eject all work properly.



Only now I discover this is one of those radios where the clock won't shut off when power is turned off (thus draining battery).
But I see some people have found a fix for that (replace transistor).

[This message has been edited by fierosound (edited 09-26-2020).]

[This message has been edited by fierosound (edited 09-24-2020).]

quote Originally posted by fierosound: Only now I discover this is one of those radios where the clock won't shut off when power is turned off (thus draining battery). But I see some people have found a fix for that (replace transistor) .

Getting some NTE232/ECG232 transistors from
https://www.nettyelectronics.com/
Only $2.00 1st Class Mailing in Canada! He's a hobbyist.
One electronics place was US$15.85 for shipping, another wanted a US$10 fee for "paperwork" + shipping.

Here's repair directions with pictures to replace NTE232 transistor to fix "clock always on" problem.
http://garageledlights.com/.../body_radio_fix.html

[This message has been edited by fierosound (edited 09-26-2020).]