Sharp md ms 701 service manual

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MD-MS701 HIMS702H

SHARP SERVICE MANUAL

No. sxmunusmm

MD-MS701 H
MD-MS702H(BL)
MD-MS702H(GY)

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/ CONTENTS

SAFETY PRECAUTION FOR SERVICE MANUAL
SPECIFICATIONS
NAMES OF PARTS ..
OPERATION MANUAL
DISASSEMBLY..........
REMOVING AND REINSTALLING THE MAIN PARTS.
ADJUSTMENT
NOTES ON SCHEMATIC DIAGRAM
BLOCK DIAGRAM
SCH EMATIC DIAGRAMIWIRING SIDE OF P.W.BOARD
WAVEFORMS OF CD CIRCUIT
TROUBLE SHOOTING
FUNCTION TABLE OF IC...
PARTS GUIDEIEXPLODED
PACKING MEI'HOD (FOR UK ONLY)

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This documenl has been published lo he used

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The contents are subjecl to change wilhoul nolice.

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MD-M5701 HIMSTOZH
SAFETY PRECAUTION FOR SERVICE MANUAL

Precautlon to be taken when replacing and servicing the
Laser Pickup.

The AEL (Accessible Emission Level) of Laser Power Output for

this model is specified to be lower than Class | Requirements.

However, the following precautions must be observed during

servicing to protect your eyes against exposure to the laser

beam.

(1) When the cabinet has been removed, the power is turned
on without a compact disc. and the Pickup is on a
position outer than the lead-in position, the Laser will
light tor several seconds to detect a disc. Do not look into
the Pickup Lens.

(2) The Laser Power Outputotthe Pickup inside the unit and cuss I L ASEll Pnnuuct
replacement service parts have already been adlusted AFPlflEIL i LASER n; cuss: r
prior to shipping. vacuum Luau llE cunt

(3) No adjustment to the Laser Power should be attempted
when replacing or servicing the Pickup.

(4) Under no circumstances look directly into the Pickup LASER KLASSE 1
Lens at any time. LUOKAN 1 LASERLAITE
(5) CAUTION-Ueeofcontrolsoradjustments,orpertormcnce KLASS 1 LASERAPPARAT
of procedures other than those specltled herein may LASER 11an 1
result in hazardous radiation exposure. LASER TNEDV 1

Laser Diode Properties
0 Material: GaAlAs
O Wavelength: 785 nm
0 Pulse time:
Read mode: 0.8 mW Continuous
Write mode: max 10 mW 0.5
min cycle 1.55
Repetition

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Precaution to be taken when replacing and servicing the laser pickup.
The following precautions must be observed during servicing to protect your eyesagainst exposure to the laser.

Warning of possible eye damage when repairing:

If the AC adaptor or batteries are connected when the top houislng (disc cover) of the unit is removed, and the PLAY key is
pressed, the laser will light up during docus access (2-3 seconds). (Fig. 24) During the operation, the laser will lesk from the
opening btween the magnetic head and the mechanical chassis (Fig. 2-2). In order to protect your eyes, you most not look
at the laser durnd repaor. Before repacring be sure to disconnect the AC adapter and remove the batteries.

Magnet head . Magnet Heart

A ' N _ Mechanism 7
. , ; _, Chasers

_ Disc rmtor Optical Pick-Up
Figure 2-1 Disc cover Figure 2-2

filo-1st" Beam

Mail PWB

Optical pick-up