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 post gives an overview of a complete functional restoration of an AC-motor Beogram 4002.
Beogram 4002 (5513): Cabinet Repair and Guiding Washers Installation
Beogram 4002 (5513): Replacing the DIN 5 Cable with a Cable Featuring RCA Plugs
Beogram 4002 (5513): Power Supply and Replacing the Reservoir Capacitors with a 3D Printed Fixture
The 550x Types have a different reservoir capacitors setup due to the AC motor design. Check this post for details: Beogram 4002 (5503): Exchanging the Reservoir and Motor Capacitors and Recap of Main PCB
Beogram 400x: Cleaning and Re-lubricating the Tone Arm Lift Mechanism
Beogram 400x: Replacing the Tracking Sensor Light Bulb with a Plug-In Ready SMD LED Assembly. This post gives some more information about the record detection mechanism and explains the circuit diagram.
Replacing Incandescent Bulbs in the RPM Adjustment Panel with LEDs. Another post that discusses replacing wavy white background labels in the RPM panel that cause a zebra pattern in the background illumination.
Beogram 4000/4002/4004 Output and RPM relay replacement with custom designed adapter PCBs that drop into the original relay's solder spots. Available for both National and Siemens type relays that were used across the Beogram 400x range.
Beogram 4002 (5513): DC Motor Restoration
This post explains how to restore the DC motors of the 551x and 552x types. The how-to video for oil infusing the oilite brass bearings is posted here. An additional failure mode of these motors are shorted spark snubbers. Beolover offers motor restorations including 24 hrs RPM stability testing. Just send an email or use the contact form to the left.
Beogram 4002 (5513): DC Motor Restoration and Yet Another Exciting Aspect of Achieving RPM Stability. This post discusses an aspect of the DC motor control system, that can lead to additional RPM stability problems. Sometimes the pickup coils for the RPM feedback get damaged during restoration of these motors. See here for an example.
Beogram 4000/2/4: Update of Sensor Arm LED Assembly. No More Crumbly Flex-PCB Mess!
Beogram 4002 (5513): Replacing the Electrolytic Capacitors on the PCBs
Beogram 4002/4004 Keypad Restoration
Most Beogram 4002 and 4004 have keypads where at least one or two keys show wear patterns.
This post shows how we fix them for our restorations.
Beogram 4002/4004: 3D Printed Cabinet Guiding Washers
Beogram 4002/4004: Replacement of the Transport Lock Bushings With 3D Printed Parts
Beogram 4002/4004: Replacement of a Broken Cable Clamp/PCB Holder
Beogram 4002/4004: New Belts and RPM Adjustment
Beogram 4002/4004: Sudden RPM Changes - Replacing RPM Trimmers and Relay
Beogram 4004/4002: Tracking Force Adjustment and Zero Force Balancing
Beogram 4002/4004: Adjusting the Tonearm Lowering Limit
Beogram 4004: Characterizing a MMC20EN Cartridge with an Analogue Productions Test LP
Beogram 4002: Signal Path between DIN5 Plug and Cartridge, Plug Replacement
Beogram 4000: Polishing the Hood
Beogram 4002: Keyboard Repair - Detached Backstops
Beogram 4002 (5501): Replacement of End Groove Detection Light Bulb with an LED
Beogram 4004: Installation of Beolover 4002 RIAA preamp (RIAA preamp needs a small modification to work in a 4004)
Some faults and their repair:
Beogram 4002 (5513): Repair of a Broken SO ('Shut Off') Switch
Beogram 6000 (5512): Dead IR Diode in Carriage Position Sensor (same procedure for 4002/4s)
Beogram 6000: Carriage always runs across the platter and RPM switches to 45 after START
Beogram 4002: Too Early Arm Lowering and RPM Change During START
Beogram 4004: START Key Not Working
Beogram 4002: Non-Working End Groove Detection - Repair of a Detached Carriage Position Sensor
Beogram 4002 (5501): Random Stop Issue Fixed - Defective Photo Resistor in the Spindle RPM Sensor
Beogram 4002 (5501): Repair of a Strange Fault Caused by a Shorted Diode D6
Beogram 4004 (5526): Adaptation of a 1985 Platter DC Motor and an Exciting New Motor Failure Mode The failure mode described in this post is a short between spark snubber wiring and one of the coils on the rotor of the motor.