Philips MCM-726 Service Manual

MP3 Micro Hi-Fi System

MCM726

all versions

TABLE OF CONTENTS

Handling chip components ........................................................... 1-1

Leadfree and safety information ................................................... 1-2

Technical specification .................................................................. 2-1

Service tools ................................................................................. 2-1

Service measurement setup ......................................................... 2-2

Connections and controls...................................................... 3-1...3-2

Dismantling instructions ....................................................... 4-1...4-3

Block diagram................................................................................ 5-1

Wiring diagram ............................................................................. 6-1

Main Board

circuit diagram .................................................................. 7-1...7-2

layout diagram ..................................................................7-3...7-4

C Music Board

circuit diagram .................................................................. 8-1...8-2

layout diagram ..................................................................8-3...8-4

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VFD Board

circuit diagram. ......................................................................... 9-1

layout diagram .......................................................................... 9-2

Cassette Board

circuit diagram ........................................................................ 10-1

layout diagram ....................................................................... 10-2

Tuner Board

circuit diagram. ........................................................................11-1

layout diagram .........................................................................11-2

Rectifier Board

circuit diagram. ....................................................................... 12-1

layout diagram ........................................................................ 12-2

Exploded view diagram ............................................................... 13-1

Mechanical partslist ..................................................................... 13-2

Electrical partslist ..............................................................14-1...14-5

Supplier Bomlist

Published by LX 0717 Service Audio Subject to modification

Version 1.0

1 - 1

1 - 2

TECHNICAL SPECIFICATIONS

2 - 1

ERVICE MEASUREMENT

2 - 2

Tuner FW

RF Generator

e.g. PM5326

DUT

Bandpass

250Hz-15kHz

e.g. 7122 707 48001

LF Voltmeter

e.g. PM2534

‰

Ri=50

S/N and distortion meter

e.g. Sound Technology ST1700B

Use a bandpass filter to eliminate hum (50Hz, 100Hz) and disturbance from the pilottone (19kHz, 38kHz).

Tuner AM (MW,LW)

RF Generator

e.g. PM5326

‰

Ri=50

DUT

Frame aerial

e.g. 7122 707 89001

Bandpass

250Hz-15kHz

e.g. 7122 707 48001

LF Voltmeter

e.g. PM2534

S/N and distortion meter

e.g. Sound Technology ST1700B

To avoid atmospheric interference all AM-measurements have to be carried out in a Faraday«s cage. Use a bandpass filter (or at least a high pass filter with 250kHz) to eliminate hum (50Hz, 100Hz).

CD RECORDER

Use Audio Signal Disc SBC429 4822 397 30184 (replaces test disc 3)

DUT

S/N and distortion meter

e.g. Sound Technology ST1700B

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

Use Universal Test Cassette Fe SBC420 4822 397 30071

LF Generator

e.g. PM5110

DUT