CDX 2 Repair , almost there..

7 replies
JB
Offline
jbh2
Bronze
Posted June 8, 2023 at 09:49 GMT
#1642370
Hi.

New gear and belt for the lid, and its nearly OK.
Only problem is when lid close, it makes a little "jump"  2-3 mm,   then closes fully.

I changed the blue cap. on the motor control pcb 8.  It was 20 uF so I changed it to

the right one 68 uF.  But that was not good.  When lid opens fully it makes a bad "krak.krak"   sound.  Gave it the old 20 uF then, opens fine witout krak sound.

Does anyone have a tip  with the small jump at closing   ?

 

Br  Jens
QU
Offline
quattttro
Bronze
Posted June 10, 2023 at 15:00 GMT
#1656997
How's the plastic standoff that holds the lid/motor gear shaft? Mine was cracked quite badly.
JB
Offline
jbh2
Bronze
Posted June 12, 2023 at 08:45 GMT
#1657022
problem solved.       By lubricating the belt with a little grease and reduce the friction

it works now.   Opens and lid stops at top without crakking.
DI
Offline
Dillen
BronzeModeratorFounder
Posted June 12, 2023 at 21:43 GMT
#1657039
Lubricating the belt?
Sounds more like an adjustment issue with the lid switch.

Martin
JB
Offline
jbh2
Bronze
Posted June 15, 2023 at 07:16 GMT
#1657083
Hi Martin, thank you for answer.    (er du ikke dansk, syntes jeg har set Dillen navnet før ?)

I cant see how LID adjustment is possible,   the lid switch is mounted with 2 small screws and it have very little tolerance in holes.  I have tried to adjust.

Also the LOAD switch is with 2 screws.

I have seen that its possible in a CDX to adjust LOAD and LASER sw.

There is no LASER sw in a CDX 2 and no MAINS sw,

I need the schematic for a CDX 2, have only one for CDX.

In a CDX the LID motor UP/DOWN voltage must bee +5 volt and -5 volt.
But I have +8 volt and - 5 volt so maybe the +8 volt is too high at makes the crack sound ?

Mvh Jens

 
DI
Offline
Dillen
BronzeModeratorFounder
Posted June 15, 2023 at 12:51 GMT
Edited June 15, 2023 at 05:22 GMT
#1657086
Beogram CDX2 has more in common with Beogram CD3300 than CDX.
For some of the Beogram CDX2 circuits, you can use the CD3300 service manual.

Martin
JB
Offline
jbh2
Bronze
Posted June 21, 2023 at 09:14 GMT
#1657172
Thank you.  I found the 3300 service manual and the schematic.  Almost the same as in CDX 2.

The problem was the (too high) positive voltage to motor. ( LID up.)   It was 8 volt.
I could not find any defective components, so I added a 15 ohm in series with the collector on the driver transistor to motor.  Now it opens very smoothly.

The minus -5 volt was -4,4 v so that worked fine. ( LID down.)
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