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This document is a service manual for the Marantz model TT6200 Turntable. It provides comprehensive information for servicing, adjusting, and troubleshooting the device.
The Marantz TT6200 is a turntable designed for playing vinyl records. It features automatic start and return functions, allowing for convenient operation. The turntable incorporates a quartz-lock direct-drive (DD) motor system, which ensures stable and accurate playback speeds (33 and 45 rpm). The device is designed to handle different record sizes (17cm and 30cm) and includes a pitch control for fine-tuning playback speed.
Power Supply Versions: The manual details several versions of the turntable, each tailored for different regions and power specifications:
Turntable Platter Height: The recommended height from the cabinet surface to the installed record is 20.5-22.0 mm (0.807-0.870 in.). This is adjustable via sub-chassis suspension screws.
Stylus Clearance: The clearance between the stylus point and the record surface should be 6-10 mm (0.24-0.39 in.). This is adjustable via screw A.
Auto-Return Ratchet Adjustment: The gap between the turntable gear hook and the ratchet trigger should be 0.3-0.4 mm (0.012-0.015 in.), adjusted by a pin.
Seesaw Arm Assembly Adjustment: The dimension at point "A" in the seesaw arm assembly should be 1.0-1.5 mm (0.040-0.060 in.).
Start-Switch Adjustment: The gap between the operating plate assembly actuator and the switch contact varies depending on the micro-switch vendor:
Stop-Switch Adjustment: The gap between the tonearm fixing plate assembly and the micro-switch also varies by vendor:
Speed Adjustment: The turntable features variable resistors (VRs) for adjusting 33 and 45 rpm speeds, ensuring the strobe index on the platter edge remains still.
Circuitry: The device includes a servo controller circuit (VC5021 IC) for precise motor speed control, a power supply printed circuit board, and various switches for operation (start/stop, speed selector, size selector, cueing knob, pitch control).
Automatic Operation: The TT6200 supports automatic start and return, simplifying the process of playing records. Users can set the size selector (17cm or 30cm) and speed selector (33 or 45 rpm), and the tonearm will automatically move to the lead-in groove and return to its rest position after playback.
Manual Control: While offering automatic features, the turntable also allows for manual control, such as moving the tonearm over the record surface and adjusting the cueing knob.
Speed and Pitch Control: The turntable provides a pitch control knob to fine-tune the playback speed, ensuring optimal audio reproduction. Strobe light indicators assist in accurate speed adjustment.
Cartridge and Headshell: The design allows for the use of a headshell and cartridge, which are removable for maintenance or replacement.
Adjustments: The manual provides detailed instructions for various adjustments crucial for optimal performance:
Troubleshooting Guide: A comprehensive troubleshooting section helps diagnose common issues, such as:
The troubleshooting guide uses a flowchart-like structure, guiding technicians through a series of checks and potential solutions, from simple adjustments to component replacements.
Exploded View and Parts List: The manual includes an exploded view diagram of the turntable, detailing all components and their relative positions. This is complemented by a parts list, which provides part numbers and descriptions, facilitating easy identification and ordering of replacement parts.
Circuit Diagrams: Detailed circuit diagrams for different versions of the turntable (N, T, A, C/U, E, AE) are provided, showing the wiring and interconnections of various components, including the power supply, motor, switches, and control boards. A dedicated servo controller circuit diagram is also included, outlining the intricate electronics responsible for motor speed regulation.
Component Identification: The manual identifies key components such as the power transformer, micro-switches (OMRON, MATSUSHITA), neon lamp, and various resistors, capacitors, and diodes, aiding in component-level repair.
Safety Precautions: The manual emphasizes safety by instructing users to unplug the AC power supply cord before performing any adjustments or maintenance.
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