Sony ICF-M33RDS Service Manual
ICF-M33RDS
SERVICE MANUAL
Ver 1.2 2001.02
With SUPPLEMENT-1
(9-926-922-81)
SPECIFICATIONS
AEP Model
UK Model
MICROFILM
FM/AM (LW) RDS RADIO
TABLE OF CONTENTS
2
SERVICING NOTES
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
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.
Mark Center frequency
CF
mark
CF3
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be damaged by heat.
red 10.70 MHz
blue 10.67 MHz
orange 10.73 MHz
black 10.64 MHz
white 10.76 MHz
– 2 –
SECTION 1
GENERAL
This section is extracted from
instruction manual.
– 3 –
– 4 –
– 5 –
– 6 –
SECTION 2
d
DISASSEMBLY
• This set can be disassembled in the order shown below.
Set Cabinet (Rear) Chassis Key Board
Main Boar
Note: Follow the disassembly procedure in the numerical order given.
CABINET (REAR)
7
hand strap
6
ANT contact plate
2
telescopic (FM) antenna
1
screw
(nylock B3 × 6)
CHASSIS
4
three claws
3
5
cabinet (rear)
five screws
(P2 × 12)
1
Break the soldering
of speaker lead.
2
chassis
– 7 –
KEY BOARD
2
two flat wires
2
Remove the lock of
two connectors (CN1, CN2).
3
MAIN BOARD
KEY board
1
three claws
2
MAIN board
1
three claws
– 8 –
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