Table Of Contents - Sony TA-AX401 Service Manual

TA-AX401
TABLE OF CONTENS
Section Title Page
1. GENERAL
1-1. Location of Controls ................ 0.00000. 3
2. DISASSEMBLY
2-1. Removal of The Front Panel.................. 4
Z-2.. Removal Of The O511 esis etenddaies cae hats 4
3. ELECTRICAL ADJUSTMENTS ................ 5
4. DIAGRAMS
4]. Block Diagram: cis 34. acai wotivdeakuswes eke 6
4-2. Circuit Boards Location ..................000. 9
4-3. Printed Wiring Boards .................0.00 10
4-4. Schematic Diagram -MAIN Section-........ 15
4-5. Schematic Diagram -DISPLAY Section- .... 19
4-6. Semiconductor Lead Layouts ................ 22
5. EXPLODED VIEWS
5-1. Case, Front Panel Section .................... 23
Seo "GHASSIS SOCHION: sc tatck ited paki eeeaiees 24
6. ELECTRICAL PARTS LIST .................. 25
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.
SAFETY CHECK-OUT
3. Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC volt-
meter. The "limit" indication is 0.75V, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are
suitable. (See Fig. A)
After correcting the original service problem,
perform the following safety check before releasing
the set to the customer:
Check the antenna terminals, metal trim, ''metallized"'
Knobs, screws, and all other exposed metal parts for
AC leakage. Check leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to
earth ground and from all exposed metal parts to any
exposed metal part having a return to chassis, must
not exceed 0.5mA (500 microampers). Leakage
current can be measured by any one of three
To Exposed Metal
Parts on Set
methods.
AC
1. A commercial leakage tester, such as the 0.15 uF S15 Ks ere
Simpson 229 or RCA WT-540A. Follow the .
manufacturers' instructions to use these instru-
ments.
2. <A battery-operated AC milliammeter.
The Data
= > Earth Ground
Precision 245 digital multimeter is suitable for ;
this job ig. A . Using an AC voltmeter to check AC leakage.