Sansui FR-D4 - Service Manual

SERVICE MANUAL
COMPUTERIZED FULL AUTOMATIC |
DIRECT-DRIVE TURNTABLE
SANSUI FR-D4
Sansui.
SANSUI ELECTRIC CO., LTD.
FR-D4
SPECIFICATIONS
TY Pe: es eheS se Two-speed direct-driven
Speeds ..-....... 33-1/3, 45 rpm >
Fine speed adjustment range
Soa ae wads ee aedes +3 %
Platter ......... Aluminium alloy die-cast
300 mm (11-13/16"’) diameter,
1.1 kg (2.42 Ibs.)
Motor «sig ea o% Brushless DC servo-type
Wow and flutter’. . Less than 0.028 % (WRMS)
SYN gis eoeg: Sate eS ~ Better than 60 dB (JEC-B)
Rumble ....... Better than 72 dB (DIN-B)
Tonearm......... Statically-balanced
S-shaped tubular type
Tonearm length... 220 mm (8-11/16”)
Overhang’...... 17.5 mm (3/4”)
Optimum cartridge weight
When the headshell supplied is employed
PEN OERE Mra tara 4~10g
Dimensions ... 2... 440 mm (17-11/32"') W.
133 mm (5-1/4")H
385 mm (15-5/32”) D
Weight .......... 6.3 kg (13.9 Ibs.) net
7.5 kg (16.5 Ibs.) packed
Power consumption .. 9 W (rated)
*The power voltage is adjusted to the oneof the area where
you bought the unit.
Specifications of the cartridge (applicable only to the
units with cartridge)
Model SC-50
TYPO. ot a Se aw eee Induced magnet
Frequency response .. 10 ~ 20,000 Hz
Output voltage .... . 3 mV per channel
(1,000 Hz, 35.4 mm/sec)
Load impedance .... 47k2
Tracking force ..... 2.58
Styles: ois co eh ieee 0.6 mil, diamond spherical
(SN=50)
*Design and specifications subject to charge without notice
for improvements.

Summary

Specifications

Turntable Specifications

Details on turntable type, speeds, platter, motor, S/N, rumble, tonearm, dimensions, weight, and power consumption.

Block Diagram

Operation

Function of Arm Position and Lifter Sensors

Control Section and Micro Computer Operation

Timing Chart of Micro Computer MB8844

Illustrates the timing relationships of inputs and outputs for the MB8844 micro computer during operation.

Practical Operation and Timing Chart

Details practical operation modes like Start-Lead-in-Return-Stop, Start-Lead-in-Repeat-Cut, and Start-Lead-in-Return-Repeat.

Operation of Micro Computer Periphery Circuits

Protection Program

Protection for Plunger Solenoid and Motors

Emergency Stop Operation

Adjustment

Auto-Return Adjustment

Procedures for installing the screen plate and adjusting the B-sensor output and record-end detection.

Lead-in Position Adjustment

Speed Adjustment

Instructions for adjusting the 33 and 45 RPM speeds using the pitch control and speed selector.

Main Parts Replacement

Replacement of Tonearm Assembly

Schematic Diagram

Sansui FR-D4 Specifications

General

Speeds	33 1/3 and 45 rpm
Drive System	Direct Drive
Motor	DC servo motor
Effective length	220mm
Overhang	15mm
Platter	300mm, 1.1kg, aluminium alloy die-cast
Tonearm Type	Static balance type
Tonearm	S-shaped pipe arm
Cartridge Type	MM Type
Cartridge weight range	4 to 8g
Output Level	2.5mV
Frequency Response	20Hz to 20kHz
Power Supply	AC 120V, 60Hz