Sony ICF-M33RDS Manuale utente

MICROFILM

SERVICE MANUAL

FM/AM (LW) RDS RADIO

AEP Model

UK Model

SPECIFICATIONS

ICF-M33RDS

Ver 1.2 2001.02

With SUPPLEMENT-1

(9-926-922-81)

– 2 –

TABLE OF CONTENTS

1. GENERAL

Features ........................................................................... 3

Choosing the Power Source ............................................ 4

Setting the Clock ............................................................. 4

Operating the Radio ........................................................ 4

Setting the Sleep Timer................................................... 5

Using the RDS Function ................................................. 5

Using Other Functions .................................................... 6

Precautions ...................................................................... 6

2. DISASSEMBLY ......................................................... 7

3. ELECTRICAL ADJUSTMENTS......................... 9

4. DIAGRAMS

4-1. Block Diagram ................................................................ 11

4-2. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 13

4-3. Printed Wiring Board – MAIN Section – ...................... 14

4-4. Printed Wiring Board – PANEL Section – .................... 17

4-5. Schematic Diagram ......................................................... 21

4-6. IC Pin Function Description ........................................... 28

5. EXPLODED VIEW................................................... 29

6. ELECTRICAL PARTS LIST ............................... 30

SERVICING NOTES

HOW TO CHANGED THE CERAMIC FILTERS

This model is used two ceramic filters of CF2 and CF3.

You must used same type of color marked ceramic filters in order

to meet same specifications.

Therefore, the ceramic filter must changed two pieces together

since it’s supply two pieces in one package as a spare parts.

CF3

mark

Mark Center frequency

red 10.70 MHz

blue 10.67 MHz

orange 10.73 MHz

black 10.64 MHz

white 10.76 MHz

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

– 3 –

SECTION 1

GENERAL This section is extracted from

instruction manual.

– 4 –

– 5 –

– 6 –

– 7 –

CABINET (REAR)

CHASSIS

Note: Follow the disassembly procedure in the numerical order given.

SECTION 2

DISASSEMBLY

telescopic (FM) antenna

ANT contact plate

hand strap

screw

(nylock B3

five screws

(P2

12)

cabinet (rear)

three claws

chassis

Break the soldering

of speaker lead.

• This set can be disassembled in the order shown below.

Set Cabinet (Rear) Chassis Key Board

Main Boar

– 8 –

KEY BOARD

MAIN BOARD

Remove the lock of

two connectors (CN1, CN2).

three claws

KEY board

two flat wires

MAIN board

three claws

– 9 –

SECTION 3

ELECTRICAL ADJUSTMENTS

0 dB = 1µV

[FM]

Setting:

Band switch: FM

[AM (LW)*]

*AM: French model

LW : AEP, UK models

Setting:

Band switch: AM (LW)

• Repeat the procedures in each adjustment several times, and the

frequency coverage and tracking adjustments should be finally

done by the trimmer capacitors.

• Remove FM antenna in FM adjustments.

Adjustment Location: Main Board (See page 10)

FM VCO VOLTAGE ADJUSTMENT

Adjustment Part Frequency Display Reading On Digital voltmeter

L 4 87.5 MHz 2.5 V ± 0.1 V

confirmation 108.0 MHz Less than 10.7 V

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L3 87.5 MHz

CT2 108 MHz

AM (LW) VCO VOLTAGE ADJUSTMENT

Adjustment Part Frequency Display Reading On Digital voltmeter

L 5 531 kHz (153 kHz) 2.7 V ± 0.1 V (3.3 V ± 0.1V)

confirmation 1,602 kHz (279 kHz) Less than 9.5 V (7.5 V)

AM (LW) TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L2 621 kHz (162 kHz)

CT1 1,404 kHz (243 kHz)

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter.

T1 450 kHz

( ): AEP, UK models

FM RF signal

generator

22.5 kHz frequency

deviation by 400 Hz

signal

Output level: as low as possible

–

level meter

(earphone) jack (EJ1)

set

FM antenna in

Ω

0.01

AM RF signal

generator

30% amplitude

modulation by

400 Hz signal

Output level: as low as possible

Put the lead-wire

antenna close to

the set.

–

level meter

set

Ω

(earphone) jack (EJ1)

–

digital voltmete

MAIN board

TP (VT)

– 10 –

Adjustment Location:

L2 AM (LW) Tracking Adjustment

Mounted on chassis

– MAIN BOARD (Component Side) –

ANTENNA IN

EJ1

T1 AM IF Adjustment

L5 AM (LW) VCO Voltage Adjustment

CT1 AM (LW) Tracking Adjustment

L4 FM VCO Voltage Adjustment

CT2

L3 FM Tracking Adjustment







– MAIN BOARD (Conductor Side) –

IC1

TP (VT)

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