Sharp md r 3 h service manual

Page 1

MD-R3H

SHARP SERVICE MANUAL

N0. S1803MDR3H/l/

MD-R3H

- In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified should
be used.

- Note for users in UK
Recording and playback of any material may require consent
which SHARP is unable to give. Please refer particularly to the
provisions of Copyright Act 1956, the Dramatic and Musical
Performers Protection Act 1956, the Perfmers Protection Acts
1963 and 1972 and to any subsequent statutory enactments and
orders.

/ CONTENTS

SAFETY PRECATION FOR SERVICE MANUAL .....
IMPORTANT SERVICE NOTES (FOR UK ONLY)
SPECIFICATIONS
NAMES OF PARTS .
OPERATION MANUAL ..
DISASSEMBLY ...........
REMOVING AND REINSTALLING THE MAIN PARTS
ADJUSTMENT ...................................
EXPLANATION OF ERROR DISPLAY.
EXPLANATION OF MECHANISM ERROR.
NOTES ON SCHEMATIC DIAGRAM
BLOCK DIAGRAM .............................
SCHEMATIC DIAGRAMNVIRING SIDE OF P.W.BOARD ..
VOLTAGE (MD MAIN PWB)
WAVEFORMS OF CD CIRCUIT.
WAVEFORMS OF MD CIRCUIT
TROUBLE SHOOTING ..
FUNCTION TABLE OF |C..
PARTS GUIDE/EXPLODED VIEW

PACKING METHOD (FOR UK ONLY)

\ /

-
This document has been published to be used

SHARP CORPORATION tor alter sales service only.

The contents are subject to change without notice.

Page 2

MD-FI3H

SAFETY PRECATION FOR
SERVICE MANUAL

WARNINGS

The ael (ACCESSIBLE EMMISSION LEVEL) of the laser
power output is less than class 1 but the laser component is
capable

of emitting radiation exceeding the limit for class 1. Therefore
it is important that the following precautions are observer
during

servicing to protect your eyes against exposure to the laser
beam.

(1) When the unit case cover is removed and LOADING SW
(SW 1956) is turned on and then PLAY SW (SW 1954
mechanism PWB) is turn on in a few second.

The laser will light for several second to detect a disk.

(2) The laser power output of the pickup unit and replacement
service parts are all factory pre-set before shipment.

Do not attempt to re-adjust the laser pick-up unit during
replacement or servicing.

(3) Under no circumstances stare into the pickup lens at any
time.

(4) If laser optical unit becomes faulty. replace the complete
laser optical unit.

(5) CAUTION-USE of controls oradjustments, orpereformance
of procedures other than those specified herein may result
in hazardous radiation exposure.

(For UK)

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(Except for UK)

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APPAREIL A LASER DE ELASSE l
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KLASS 1 LASERAPPARAT
LASER TRIDVI

LASER TRIEDV1

Laser Diode Properties
Material: GaAlAs
Wavelength: 785 nm
Pulse time: Read mode: 0.8 mW Continuous
Write mode: max 10 mW 0.5 S
min cycle 1.5 S
Repetition

Laser Diode Properties
Material: GaAlAs
Wavelength: 780 nm
Emission Duration: continuous
Laser Output: max. 0.6 mW

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