Sony IT-A4000 Service Manual page 2

IT- A4000
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.
Fiexible Circult Board Repairing
@ Keep the temperature of the soldering iron around
270°C during repairing.
® Do not touch the soldering iron on the same conductor
of the circuit board (within 3 times).
@ Be careful not to apply force on the conductor when
soldering or unsoldering.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK A OR DOTTED
LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
TABLE OF CONTENTS
Owner's record The model and serial numbers are located at the bottom Section Title Page
of the phone.
———
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Record the serial number in the space provided below.
Refer to th bers whene Il
Say cess eacrane in saa
ie Foe rer net
1. GENERAL
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Model No. IT-A4000 Serial No.
bee 2. DESCRIPTION «occ ccc ec cree tet et ee eeneeenees 20
| Warning | To prevent fire or shock hazard, do not
expose the set to rain or moisture. 3. DISASSEMBLY «+s: terre etree etter etter tence eens 28
To avoid electrical shock, do not open the
cabinet 4, DIAGRAMS
Refer servicing to qualified personnel only. : .
4 4-1. IC Block. Diagrams TLE ETTTE eee eee ee 29
[ Cauti 4-2, Schematic Diagram — Main Section — s++t+srtress 31
aution Be sure to put alkaline batteries into your 4-8, Printed Wiring Board — Main Section —-+++++++++: 35
telephone before you use it; otherwise, all . wes ;
the programmed data will be erased if a 4-4, Printed Wiring Board ee Key Board Section Toe Oe Py ae' Al
power interruption occurs. 4-5. Schematic Diagram — Key Board Section — -+::-:: 45
4-6. Semiconductor Lead Layouts ssrrrrrrere reser eeees 48
4-7. Block Diagram Pe ee a er EO a ee ee Wer ee 49
5. EXPLODED VIEWS «reece ctr t teeter e eter eneeenes 51
6. ELECTRICAL PARTS LIST «sors tr reece terete ren eenes 53