Electrical Adjustment; Diagrams; Circuit Boards Location - Sony TA-E1 Service Manual

IDLING ADJUSTMENT AND OFFSET VOLTAGE
CHECK
• Perform this adjustment after replacing CP103 and CP104.
• Perform this adjustment more than 10 minutes after supplying
the power.
Connection:
MAIN board
TP501 (L-CH), TP502 (R-CH)
TP503 (L-CH), TP504 (R-CH)
Procedure:
1. Connect the digital voltmeter as shown above.
2. Adjust RV501 (L-CH) and RV502 (R-CH) of the MAIN board
so that the digital voltmeter reads 50 mV ±5 mV. (Idling adjust-
ment)
Measuring Adjusting
Point Point
L-CH TP501 to TP503 RV501
R-CH TP502 to TP504 RV502
3. Measure the voltage of both terminals of R221 (L-CH) and R222
(R-CH) of the MAIN board, and check that the voltage is within
2 mV.
(Offset voltage check)
Measuring Point
L-CH Both terminals of R221
R-CH Both terminals of R222
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SECTION 2
ELECTRICAL ADJUSTMENTS
BALANCE OUTPUT LEVEL ADJUSTMENT
• Perform this adjustment when replacing CP102.
• Perform this adjustment after the idling adjustment
Connection:
AF OSC
Digital voltmeter
LINE1 input
attenuator
Procedure:
1. Connect as shown above.
2. Rotate the INPUT SELECTOR knob, and set the input source
to LINE 1 .
3. Set the input level so that the oscilloscope waveform level be-
comes approx 3 V.
4. Adjust RV401 (L-CH) and RV402 (R-CH) so that the two wave-
Adjusting
form levels on the oscilloscope become equal and their phases
Value
are reversed.
50 mV ± 5 mV
50 mV ± 5 mV Adjusting Point
Pin 2 (CH1) and
L-CH
Pin 3 (CH2) of CN203
Pin 2 (CH1) and
R-CH
Pin 3 (CH2) of CN203
Specified Value
Adjusting Value:
Within 2 mV
Within 2 mV
Adjustment Location:
[MAIN board] (Component Side)
OFFSET
VOLTAGE
R222 R221
RV402
BALANCE OUT
LEVEL R CH
RV401
BALANCE OUT
LEVEL L CH

3-1. CIRCUIT BOARDS LOCATION

Oscilloscope
Set
LED A board
BALANCED-OUT 2 3 pin
Adjusting Value
RV401
RV401
Waveform of
Pin 2 (CH1)
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.
Waveform of
Note:
Pin 3 (CH2)
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
Phases of waveforms of
and tantalums.
Pins 2 and 3 should be reversed
• All resistors are in Ω and
specified.
• %
• 2 : nonflammable resistor.
• 5 : fusible resistor.
• C : panel designation.
Note:
The components identi-
fied by mark ! or dotted
line with mark ! are criti-
cal for safety.
Replace only with part
number specified.
TP503 TP501 TP504 TP502
• S : B+ Line.
• T : B– Line.
RV501 RV502
• H : adjustment for repair.
IDLE IDLE
• Voltages and waveforms are dc with respect to ground in
L CH R CH
playback mode.
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
F
5 5
SECTION 3

DIAGRAMS

PS board
AC J board
SW L board
SW P board
LED B board
For printed wiring boards.
Note:
• X : parts extracted from the component side.
•
• b : Pattern from the side which enables seeing.
1
/ W or less unless otherwise (The other layers' patterns are not indicated.)
4
: indicates tolerance.
Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B)
Parts face side: Parts on the parts face side seen from the
(Side A)
Note:
Les composants identifiés par
une marque ! sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.
: TUNER
TA-E1
MAIN board
VOL board
® : Through hole.
pattern face are indicated.
parts face are indicated.