ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
I have a lovely 4004 paired with a Beomaster 2400. Everything powers up, and sound great. The 4004 however doesn't track. The belt on the carriage motor is fine. The transport lock is in the "play" position. Lubricant isn't hardened. I'm handy, but not a tech. Is there anything else I can look for before I pony up the money to replace or repair this?
How do you mean? Does the arm move and drop? Is it that it does not move once on the record?
Peter
The arm drops, but does not move. Not on the record, nor off the record.
Does the arm drop on the record, and then does not move, or does it drop off the record. Check that your pickup has a needle and that the needle is riding in the record track, check the weight adjustment is set correctly.
Collecting Vintage B&O is not a hobby, its a lifestyle.
Sounds like the light sensor is not working - either the light sensitive resistor or the bulb. Would be beyond me personally but it is fixable!
Has a cartridge. It plays, but the carriage won't move, so it only plays as much as the lateral play in the arm allows. The light works. I suppose it could be the sensor, or the carriage motor. Ugh.
But the carriage motor works to get the arm to the right place - probably the sensor.
The sensor and the lamp.In a closed compartment at the foot of the carriage.
Martin
The carriage doesn't move.
Check the opto at the carriage foot (as already suggested).An interrupter operates with the tonearm and goes between the lamp and the sensor.If the lamp has burned the carriage will not follow the tonearms movements.
The bulb is ok. I found and fixed a bad connector, and now the carriage motor works. The LED in the pic below isn't lighting.
The LED in the photo is not sitting at the foot of the carriage but rather on a PCB at the subchassis.
The LED in the photo is not emitting visible light. It's Infrared. You need a digital camera (cell phone) to see the light.
The LED in the photo is not related to the tracking. It signals the setdown and end-of-record points to the electronics basedon the patterns of the ruler that travels between the LED and the sensor on the other side.The tracking is controlled by a small filament lamp and a sensor, sitting in a housing closed off from ambient light atthe base of the carriage.
I already checked the filament lamp, and its working. Didn't know the LED was IR. thanks for that. I'm kind of back at square one now with new problems. Carriage motor now returns the carriage, but won't shut off once the carriage is in the full reset position. The stop button raises the arm, but the main drive is always on....ie the platter is always spinning. The local techs either won't touch it, or want $600, which is a bit rich for me right now.
Is the ruler missing ?It is an essential part.If you dismounted it, did you put it back and adjusted it correctly ?Hitting the off switch at the far right end of travel ?Switch intact ?
Ruler aligned. Switches intact.
Hitting the off switch at the far right end of carriage travel ?All connectors correctly seated at the main board ? They can easily go in one pin off to one side.