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Beogram 4000 Restoration

This video shows how to prepare and double-box a Beogram 4000 for shipping (please make sure to also read this update about securing the carriage for transport, and this post about how to secure the arms with a reproduction B&O style elastic support):


This post shows how to place the cartridge into a Beolover MMC shipping container, which will be supplied along with the Beolover double box.

This video shows how to unbox and set-up a Beogram 4000 after it comes back restored:



This is a list of key Beogram 4000 related entries. They represent most of the essential tasks that I performed for full restorations and also give some insight into repairing miscellaneous issues. All the parts that I developed are available to other enthusiasts and shops - just use the contact form and get in touch!

Beogram 4000: Cleaning of the Tone Arm Carriage Position Switches and a Non-Returning Carriage

Beogram 4000: Recapping the PCBs

Beogram 4000: Adjusting the AC Motor Voltage (additional info here)

Beogram 4000: Restoration of AC Motor (this post shows how to fix a 'knocking' motor)

Beogram 4000: Replacing the Reservoir and Motor Capacitors Using a 3D Printed Adapter
(see here for additional information on this procedure)

Beogram 4000: Replacing the Light Bulbs in the Control Panel with LEDs
Please, read this post, which discusses a different keypad PCBs that can be found in some Beogram 4000s)

Beogram 4000: Restoring the Slow Slide Transport Function

Beogram 4000: Replacing the Light Bulb of the Tracking Sensor with a Drop-In LED Assembly
some more info about the photoresistors in the tracking sensor here.

Beogram 4000: Replacement of the Incandescent Bulb in the Sensor Arm with an LED

Beogram 4000: Replacing sensor arm photo cell with modern one

Beogram 4000: Restoration of a Seized Solenoid to Tonearm Linkage

Beogram 4000: Adjustment of the Tonearm Height and Tracking Force

Beogram 4000: Adjusting the Platter and the Chassis

Beogram 4000: Adding a Grounding Switch to Get Rid of Humming. This post has some higher resolution pictures of the way the grounding switch can be installed.

Beogram 4000: Adjusting the Solenoid and the Switches

Beogram 4000: Installation of Hood Mounting Screw Springs

Beogram 4000: Polishing the Hood

Beogram 4000: Installation and removal of keypad keys

Upgrades:

Beogram 4000: New Aluminum Carriage Pulley

Beogram 4000: Gold Plating of Terminals in Control System Switches

Some faults and their repair:

Cracked/broken off MMC cartridge mount:
There are two types of cartridge mounts that were used in the Beogram 4000. Both break off occasionally. These two posts show how to replace
(1) the later type: Beogram 4000: Replacing a Broken MMC Cartridge Mount with a 3D Printed Replacement Assembly and

Beogram 4000: Solenoid oscillates

Beogram 4000: Replacement of a Stuck RPM Relay with a Modern Encapsulated SMD Relay

Beogram 4000: Fixing a Bent Output Switch Contact Tab

Beogram 4000: Adjusting the Gap at the Carriage Servo Pulley Bearing

Beogram 4000: End Groove Detection Issue
(Carriage stops before end switch is reached when no record is present)

Beogram 4000: An Entertaining Evening Exploring the Differential Stop Circuit
(Carriage sometimes does not return and needle remains stuck in the final groove)

Beogram 4000: An Entertaining Evening Exploring the Differential Stop Circuit
(record detection works for 12" set down point but not at 7")

Beogram 4000: Intermittent "17" Position Switch Causing Immediate Touchdown After Launch

Beogram 4000: Prematurely Activating Solenoid
(After pressing ON the solenoid briefly twitches, then the carriage moves on normally to the LP setdown point)

Beogram: Hot transformer, weak motors, suddenly activating solenoid when mechanically tilting the carriage
(This post discusses what happens when the bolt insulator of a chassis-mounted transistor is omitted and if one of the push-pull transistors of the AC motor output stage is shorted out)

(This post describes how to replace the automatic gain control bulb in the AC platter motor oscillator circuit with a resistor and a diode clamp)

MMC Cartridge Repair:

We do not do it, but you can get your cartridges professionally repaired/rebuilt here:




2 comments:

  1. Hi Guy, Nice work ans thanks for your blog, it can help a lot of people.

    I write you from France ans i realy néed your light to fix my b4000.
    I got a problèm with the arm chariot motor. Then i fond a part inside the machine but i don t Know what is it. Can i send you a pics to tell me which part it is?
    Thanks by advance.

    ReplyDelete
  2. Dust cover repair for Beogram 4004. Cost? Thanks!

    ReplyDelete

Comments and suggestions are welcome!