Sony TA-N1 User Manual
TA-N1
SERVICE MANUAL
SPECIFICATIONS
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
MICROFILM
STEREO POWER AMPLIFIER
1
SAFETY CHECK-OUT
TABLE OF CONTENTS
After correcting the original service problem, perform the following safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for A C leakage. Check leakage as
described below.
LEAKAGE
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 0.5 mA (500 microampers). Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a V OM
or battery-operated A C v oltmeter . The “limit” indication is 0.75
V, 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)
To Exposed Metal
Parts on Set
1. SERVICE NOTE ................................................................ 3
2. GENERAL ........................................................................... 5
3. ELECTRICAL ADJUSTMENT ..................................... 7
4. DIAGRAMS
4-1. Circuit Boards Location........................................................7
4-2. Schematic Diagram – Main L Section – ............................... 8
4-3. Printed Wiring Board – Main L Section – ............................9
4-4. Schematic Diagram – Main R Section –.............................10
4-5. Printed Wiring Board – Main R Section – .......................... 11
4-6. Schematic Diagram – Input Section – ................................12
4-7. Printed Wiring Board – Input Section –.............................. 13
4-8. Schematic Diagram – Power Section –............................... 14
4-9. Printed Wiring Board – Power Section –............................ 15
5. EXPLODED VIEWS
5-1. Top and Back Panel Section................................................16
5-2. Front Panel Section............................................................. 16
5-3. Heat Sink Section................................................................17
5-4. Bottom Plate and Frame Section.........................................18
6. ELECTRICAL PARTS LIST ...................................19
0.15µF
Ω
1.5k
Earth Ground
AC
voltmeter
(0.75V)
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK ! OR DO TTED LINE
WITH MARK ! 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 PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE ! SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE
FONCTIONNEMENT . NE REMPLACER CES COMPOSANTS
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS
SONT DONNÉS DANS CE MANUEL OU DANS LES
SUPPLÉMENTS PUBLIÉS PAR SONY.
MODEL IDENTIFICATION
— BACK PANEL —
Parts No.
PARTS No. MODEL
4-217-757-1π US , CND
4-217-757-2π AEP, UK, E, AUS
• Abbreviation
CND : Canadian model
AUS : Australian model
2
SECTION 1
SERVICE NOTE
• SERVICE POSITION
When performing servicing, use a table about 15 cm as shown in
the figure.
FPT558
CN554 (Red) 2P
CN654 (Red) 4P
CN702 (Black) 4P
CN701 (White) 4P
CN751 (Red) 4P
CN852 (Red) 4P
EPT506
CN201 (Red) 4P
CN604 (White) 4P
• REPLACING THE POWER TRANSISTOR
When replacing the power transistors (Q304 to Q313: L-ch, Q404
to Q413: R-ch), replace all ten together.
L ch : Q304 to Q313
R ch : Q404 to Q413
• SECURING THE GRILL (A)
When securing the grill (A) to the top panel, use the Sony bond
SC608LV (7-432-912-48). (
Top panel (Buttom side)
)
Grille (A)
3
• NOTE ON ARRANGING WIRES
As how the wires in this unit are drawn affect the sound quality,
note down the positions of wires before beginning servicing.
After repairs, arrange the wires as follows.
A : After binding wires, push down.
B : Bind avoiding touching the heatsink.
C : Bind avoiding touching the wires below (binder A).
D : Arrange so that the wires from CN802 pass below the wires
from CN2.
CN2
AC/PS board
Heatsink
CN802
D
Lead pin
Lead pin
PS B
board
B
C
Lead pin
Lead pin
INPUT board
A
4
SECTION 2
GENERAL
This section is extracted from
instruction manual.
5
6
SECTION 3
ELECTRICAL ADJUSTMENT
TA-N1
SECTION 4
DIAGRAMS
BIAS CURRENT ADJUSTMENT
• As the voltage changes according to the time the power is supplied, adjust correctly according to the following procedure.
Connection:
Digital voltmeter
MAIN-L, R boards
TP301 to 305 (L-CH), TP401 to 405 (R-CH)
TP306 (L-CH), TP406 (R-CH)
Procedure:
1. Measure the voltage at the five measuring points just after sup-
plying the power, and adjust RV301 (L-CH) and RV401 (R-CH)
so that the measuring point with the lowest voltage becomes
approx 15 mV.
Measuring Point Adjusting Point
L-CH Between the 5 measuring points
(+) TP301, TP302, TP303, R V301
TP304, TP305 and TP306 (–)
R-CH Between the 5 measuring points
(+) TP401, TP402, TP403, R V401
TP404, TP405 and TP406 (–)
4-1. CIRCUIT BOARDS LOCATION
MAIN L board
LED board
INPUT board
MAIN R board
2. Leave for one hour with the power supplied. (Aging)
3. Measure the voltage at the respective measuring points and ad-
just RV301 (L-CH) and RV401 (R-CH) so that the voltages become within the ranges shown in the following table. Adjust to
the voltage with the highest priority shown in the table as much
as possible.
Priority Order Adjusting Value
1st (Highest priority) 19.8 mV to 22.0 mV
2nd 19.8 mV to 24.2 mV
3rd 18.7 mV to 24.2 mV
4th 18.7 mV to 25.2 mV
5th 15.0 mV to 25.2 mV
4. Leave for another 30 minutes if the adjustment control has been
rotated.
5. Measure the voltage again and check that it is within the adjusting value. If outside, repeat from step 3 again.
6. Be sure to perform aging for more than 30 minutes if the adjustment control has been rotated. Finally check the voltage before
ending the adjustment.
AC SW board
AC/PS board
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and 1/
specified.
• % : indicates tolerance.
• 2 : nonflammable resistor.
• 5 : fusible resistor.
• C : panel designation.
Note:
The components identified by mark ! or dotted
line with mark ! are critical for safety.
Replace only with part
number specified.
4
W or less unless otherwise
Note:
Les composants identifiés par
une marque ! sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.
PS B board
For printed wiring boards.
Note:
• X : parts extracted from the component side.
®
•
• b : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B) pattern face are indicated.
Parts face side: Parts on the parts face side seen from the
(Side A) parts face are indicated.
: Through hole.
• S : B+ Line.
• T : B– Line.
• H : adjustment for repair.
• V oltages and wa vef orms are dc with respect to ground in
playback mode.
• V oltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production tolerances.
• Signal path.
F : AUDIO
77
TA-N1
4-2. SCHEMATIC DIAGRAM – MAIN L SECTION –
(Page 12)
(Page 14)
(Page 14)
(Page 12)
(Page 14)
8
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