Philips mx 940 aht 01 service manual

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MANUAL 1845 (MODEL MX940AHTO1) (

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Philips Consumer Electronics Company MANUAL 1845

A Division of Philips Electronics North America Corp. . .
Philips Magnavox Model: MX940AHT01

Technical Service Data File:1998:1845

Service Solutions Group mud Supplement1 & 2)

Technical Publications Dept.

PO. Box 555

401 East Old Andrew Johnson Highway
Jefferson City, TN 37760

MX940AHT01 AUDIO SYSTEM

TABLE OF CONTENTS
Description Description
Important Safety Notice ..... Tuner CBA
Specifications ....... Pro Logic CBA

Pro Logic Schematic'Diagram

4
Block Diagram ..... ..5
..6 LCD Schematic Diagram...
7
8

Electrical Adjustment Procedures.
Adjustment Location Diagram...
Wiring Diagram .......
IC Pin Configuration
lC Pin Function Description ..
IC and Transistor Voltage Charts.
Main Schematic Diagram...

LCD CBA ............................
.. Upfront Control Schematic Diagram
..9 Upfront Control CBA
12 Remote Control Schema lo 9
15 Remote Control CBA ....................
17 Remote Control Exploded View

Preamp CBA ........ 20 Subwoofer Exploded View.

Audio Amp CBA... 22 Cabinet Exploded View ......... 40
Subwoofer Schematic Diagram Cabinet and Electrical Replacement Parts List. 41
Tuner Schematic Diagram ........... Safety Guidelines ........................................................ 44

To order parts call the TOLL FREE Philips Sales Center number:
(In USA) 1-800-851-8885
(In Canada) 1-800-363-PART - 1-800-535-3715 (Fax)

REFER TO BACK COVER FOR IMPORTANT SAFETY NOTICE/GUIDELINES

SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING ELECTRONIC

EQUIPMENT CONTAINING HIGH VOLTAGES.

CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING.

Visit our World Wide Web Site at http://www.magnavox.com
MP/EM-298 GVL @1998 Philips Consumer Electronics Company Printed in USA

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1845 -2

IMPORTANT SAFETY NOTICE

Proper service and repair is important to the safe, reliable operation of all
Philips Consumer Electronics Company Equipment. The service procedures
recommended by Philips and described in this service manual are effective
methods of performing service operations. Some of these service operations
require the use of tools specially designed for the purpose. The special tools
should be used when and as recommended.

It is important to note that this manual contains various CAUTIONS and
NOTICES which should be carefully read in order to minimize the risk of
personal injury to service personnel. The possibility exists that improper
service methods may damage the equipment. It also is important to
understand that these CAUTIONS and NOTICES ARE NOT EXHAUSTIVE.
Philips could not possibly know, evaluate and advise the service trade of all
conceivable ways in which service might be done or of the possible
hazardous consequences of each way. Consequently, Philips has not
undertaken any such broad evaluation. Accordingly, a servicer who uses a
service procedure or tool which is not recommended by Philips must first
satisfy himself thoroughly that neither his safety nor the safe operation of the
equipment will be jeopardized by the service method selected.

* * Hereafter throughout this manual, Philips Consumer Electronics Company
will be referred to as Philips.

WARNING

Critical components having special safety characteristics are identified
with a A by the Ref. No. in the parts list and enclosed within a broken
line* (where several critical components are grouped in one area) along
with the safety symbol A on the schematics or exploded views.

Use of substitute replacement parts which do not have the same
specified safety characteristics may create shock, fire, or other
hazards.

Under no circumstances should the original design be modified or
altered without written permission from Philips. Philips assumes no
liability, express or implied, arising out of any unauthorized
modification of design. Servicer assumes all liability.

*Broken Line _ . _ . _ . -

FOR PRODUCTS CONTAINING LASER:

DANGER - Invisible laser radiation when open. AVOID DIRECT EXPOSURE TO BEAM.

CAUTION - Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation
exposure.

CAUTION - The use of optical instruments with this product will increase eye hazard.

TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL
MANUFACTURERS REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART
NUMBERS IN THE PARTS LIST SECTION OF THIS SERVICE MANUAL.