3 Disc Tray Changer |
3DTC |
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Table of Contents |
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Warning - ESD...................................................................... |
2 |
Wiring.................................................................................... |
3 |
Brief description .................................................................... |
4 |
Truth table ............................................................................ |
6 |
Timing Diagram ................................................................... |
7 |
Repair Tips |
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Replacing the CD Drive................................................... |
11 |
Jammed carriage, blocked tray ....................................... |
12 |
Replacing the gears ........................................................ |
15 |
Exploded view..................................................................... |
20 |
© Copyright 2001 Philips Consumer Electronics B.V. Eindhoven, The Netherlands
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise without the prior permission of Philips.
Published by HB 0148 Service Audio Printed in The Netherlands Subject to modification
CLASS 1
LASER PRODUCT
©3103 785 25140
2
WARNING
CHARGED CAPACITORS ON THE SERVO BOARD MAY DAMAGE THE CD DRIVE ELECTRONICS WHEN CONNECTING A NEW CDM MECHANISM. THAT´S WHY, BESIDES THE SAFETY MEASURES LIKE
•SWITCH OFF POWER SUPPLY
•ESD PROTECTION
ADDITIONAL ACTIONS MUST BE TAKEN BY THE REPAIR TECHNICIAN.
The following steps have to be done when replacing the CD mechanism: |
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1. |
Disconnect flexfoil from old CD drive |
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2. |
Put a paperclip over contacts of flexfoil to short-circuit the contacts (fig.1) |
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fig.1 |
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3.Remove old CD drive
4.Remove paperclip from flexfoil
5.Connect flexfoil to new CD drive
6.Remove ESD-protection (solder joint) from laserunit (see below)
7.Position new CD drive in its studs
Attention: The laser diode of this CD drive is protected against ESD by a solder joint which shortcircuits the laserdiode to ground.
For proper functionality of the CD drive this solder joint must be removed after connection the drive to the set.
3
WIRING
Module
WIRING
CD Drive
4
Brief description
On the next pages various actions of the 3 Disc Tray Changer are described with simplified drawings.
1.Initial state. After Power on the changer is in this position. The drawer closed
Carriage #1 is in Play position
Carriage #2 and #3 are in home position
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2 |
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3 |
1 |
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Drawer |
Clamper |
Carriage |
The Changer looks like
2.Tray open.
The Drawer is moved out
Carriage #2 and #3 remain in home position
2
3
1 |
Drawer
Clamper |
Carriage |
The Changer looks like
5
3.Carriage extra.
This position is necessary to get access to the lower carriage. It is also used during disc change.
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Carriage extra position |
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2 |
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3 |
1 |
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Drawer |
Clamper |
Carriage |
The changer looks like
The various states are recognized by seven switches.
For functions see truth table on next page.
SW4&5
Location of switches
SW2&3
SW6 SW7 SW8
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6 |
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Truth Table |
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Register output / Switch |
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Q0 |
Q1 |
Q2 |
Q3 |
Q4 |
Q5 |
Q6 |
Q7 |
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Function |
SW |
SW |
SW |
SW |
SW |
SW |
SW |
- |
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8 |
7 |
6 |
5 |
4 |
3 |
2 |
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Slider reverse recognition |
1 |
0 |
0 |
0 |
0 |
0 |
0 |
X |
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Slider forward recognition |
0 |
1 |
0 |
0 |
0 |
0 |
0 |
X |
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Drawer closed recognition |
0 |
0 |
1 |
0 |
0 |
0 |
0 |
X |
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No carriage under clamper |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
X |
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Carriage #1 under clamper |
0 |
0 |
0 |
0 |
1 |
0 |
0 |
X |
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Carriage #2 under clamper |
0 |
0 |
0 |
1 |
0 |
0 |
0 |
X |
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Carriage #3 under clamper |
0 |
0 |
0 |
1 |
1 |
0 |
0 |
X |
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Carriage home recognition |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
X |
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Carriage extra recognition |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
X |
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