Sony Section Electrical Adjustments, TA-E1 SECTION DIAGRAMS, Balance Output Level Adjustment

SECTION 2

ELECTRICAL ADJUSTMENTS

TA-E1

SECTION 3

DIAGRAMS

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:

Digital voltmeter

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	Adjusting
	Point	Point	Value
L-CH	TP501 to TP503	RV501	50 mV ± 5 mV
R-CH	TP502 to TP504	RV502	50 mV ± 5 mV

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	Specified Value
L-CH	Both terminals of R221	Within 2 mV
R-CH	Both terminals of R222	Within 2 mV

BALANCE OUTPUT LEVEL ADJUSTMENT

•Perform this adjustment when replacing CP102.

•Perform this adjustment after the idling adjustment

Connection:

AF OSC

Oscilloscope

LINE1 input

attenuator

Set

BALANCED-OUT 2 3 pin

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- form levels on the oscilloscope become equal and their phases are reversed.

	Adjusting Point		Adjusting Value
L-CH	Pin 2	(CH1) and	RV401
	Pin 3	(CH2) of CN203
R-CH	Pin 2	(CH1) and	RV401
	Pin 3	(CH2) of CN203

Adjusting Value:

Waveform of

Pin 2 (CH1)

Waveform of

Pin 3 (CH2)

Phases of waveforms of

Pins 2 and 3 should be reversed

Adjustment Location:

[MAIN board] (Component Side)

OFFSET

VOLTAGE

R222 R221

3-1. CIRCUIT BOARDS LOCATION

PS board

MAIN board

AC J board

LED A board

SW L board

SW P board

LED B board VOL 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.			For printed wiring boards.
Note:			Note:
•	All capacitors are in µF unless otherwise noted. pF: µµF		•	X : parts extracted from the component side.
	50 WV or less are not indicated except for electrolytics		•	® : Through hole.
	and tantalums.		•	b: Pattern from the side which enables seeing.
•	All resistors are in Ω and 1/4 W or less unless otherwise		(The other layers' patterns are not indicated.)
	specified.
•	% : indicates tolerance.			Caution:
•	2 : nonflammable resistor.			Pattern face side: Parts on the pattern face side seen from the
•	5 : fusible resistor.			(Side B)	pattern face are indicated.
•	C : panel designation.			Parts face side:	Parts on the parts face side seen from the
				(Side A)	parts face are indicated.
	Note:	Note:
	The components identi-	Les composants identifiés par
	fied by mark !or dotted	une marque !sont critiques
	line with mark !are criti-	pour la sécurité.
	cal for safety.	Ne les remplacer que par une
	Replace only with part	piéce portant le numéro

RV402	TP503	TP501 TP504		TP502
BALANCE OUT
LEVEL R CH
	RV501		RV502
RV401	IDLE		IDLE
	L CH		R CH
BALANCE OUT
LEVEL L CH

	number specified.	spécifié.
•	S : B+ Line.
•	T : B– Line.
•	H : adjustment for repair.
• Voltages and waveforms are dc with respect to ground in
	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 : TUNER

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