Sony SRFM-73 Service manual
SRF-M73
SERVICE MANUAL
Ver 1.0 1999. 03
SPECIFICATIONS
US Model
Panama Model
MICROFILM
FM STEREO/AM PLL SYNTHESIZED RADIO
SECTION 1
SERVICING NOTES
TABLE OF CONTENTS
1. SERVICING NOTES............................................... 2
2. GENERAL ................................................................... 3
3. DISASSEMBLY ......................................................... 4
4. ELECTRICAL ADJUSTMENTS......................... 6
5. DIAGRAMS
5-1. Block Diagram ................................................................ 8
5-2. Printed Wiring Boards..................................................... 10
5-3. Schematic Diagram ......................................................... 13
5-4. IC Pin Function Description ........................................... 18
6. EXPLODED VIEWS ................................................ 19
7. ELECTRICAL PARTS LIST ............................... 20
Forced Reset
The system microprocessor can be reset in the following procedure.
Use these procedure when the unit cannot be worked normally
due to the overrunning of the microprocessor, etc.
Procedure:
1. Set to radio OFF.
2. While pressing the
[SCAN] button, press two buttons of [START/
STOP] and [BAND] simultaneously for 5 seconds.
3. The unit is reset, and display blinking “
AM 12:00”.
– 2 –
SECTION 2
GENERAL
This section is extracted from
instruction manual.
– 3 –
· This set can be disassembled in the order shown below.
)
SECTION 3
DISASSEMBLY
Set
Note: Follow the disassembly procedure in the numerical order given.
Cabinet (Front) Assy
Cabinet (Rear) Assy
Key Board
CABINET (FRONT)/(REAR) ASSY
2
three screws
(B1.7 × 8)
Main Board Knob (A
1
Remove the battery case lid
of the arrow.
4
2
two screws
(B1.7 × 8)
cabinet (rear) assy
KEY BOARD
2
Open the key board
to direction of the arrow.
3
cabinet (front) assy
1
three claws
– 4 –
1
four claws
MAIN BOARD
Note: Check that two switch (S1,
S2) is latched with two
adaptors when carrying
out installation.
5
main board
S1
S2
3
4
two claws
knob (vol)
KNOB (A)
1
1
2
screw
(B1.7
claw
claw
×
8)
1
Remove two solders.
2
two knobs (A)
3
two adaptors
– 5 –
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