Sony XR-C440 service manual DB=0.775, Tape Speed Adjustment, Speed checker Frequency counter

See the adjustment location from on page 22 for the ad- justment.

TAPE DECK SECTION 0 dB=0.775 V

Tape Speed Adjustment

Procedure:

1. Put the set into the FWD PB mode.

						speed checker
							or
test tape						frequency counter
WS-48A
(3 kHz, 0 dB)					10 kΩ
	set						– +
			LINE OUT
Specification: Constant speed
Speed checker				Frequency counter
–1.5 to +2.5%					2,955 to 3,075Hz
Adjustment Location: See page 22.
DOLBY Level Adjustment
Setting:
Preset 3 (DOLBY) button			:		OFF
SEL (BAS) button			:		Center
SEL (TRE) button			:		Center
SEL (BAL) button			:		Center
SEL (FAD) button			:		Center
SEL (VOL) button			:		Maximum
D-BASS control			:		OFF
		main board				L-CH: IC301 7
test tape		TP (DOLBY )				R-CH: IC301@¢
					
P-4-D400						level meter
(400Hz, 0dB)

set	+
	–
	main board
	TP (GND)

Procedure:

1.Put the set into the FWD PB mode.

2.Adjust RV231 (L-CH) and RV131 (R-CH) so that the level meter reading is –6±0.5 dB (0.37 to 0.41 V).

Adjustment Location: See page 22.

TUNER SECTION

(XR-C450: E, Saudi Arabia model only)

0dB=1µV

Cautions during repair

When the tuner unit is defective, replace it by a new one because its internal block is difficult to repair.

FM Auto Scan/Stop Level Adjustment

Setting:

SOURCE button					: FM
FREQUENCY SELECT switch : 10 k
FM RF signal
	generator			antenna jack (J1)
			0.01 ∝ F
						set
Carrier frequency : 97.9 MHz
Output level		: 22 dB (12.6 ∝ V)
Mode		: mono
Modulation		: 1 kHz, 75 kHz deviation

Procedure:

1.Set to the test mode. (See page 19).

2.Push the SOURCE button and set to FM.

Display

FM

SHUF1

3.Push the preset 3 button.

Display

FM

SHUF1

4.Adjust with the volume RV2 on TU1 so that the “FM” indica- tion turns to “FM0” indication on the display window.

But, in case of already indicated “FM0”, turn the RV2 so that put out light “0” indication and adjustment.

Display

SHUF1

Adjustment Location: See page 22.

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