SAVA-57 - Sony Audio Service Manual (repair manual). Page 7

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Reference Information:
For this adjustment, the reaching distance of the infrared rays in-
creases when the MUTING LEVEL (sensitivity) is raised, but if the
power of the front speaker is turned OFF, pop noises are produced
from the rear speaker.
If the MUTING LEVEL (sensitivity) is dropped on the other hand,
pop noises are reduced, but the reaching distance of the infrared
rays decreases.
Adjust according to the user's using environment.

CN201

IC202

R226

TP6

CARRIER FREQUENCY

TP5

L201

JW112

JW133

JW113

JW114

JW111

JW107

JW108

JW132

JW109

JW110

RECEIVING

FREQUENCY

&

MUTING

LEVEL

RECEIVING
FREQUENCY

MUTING
LEVEL

TP7

TP8

L1

RV102

IC104

IFT103

TP102

D1

JW115
JW116

JW117

JW118

JW119

JW120

JW122

JW121

SCN101

Note:
The adjustment results of this procedure differs according to the
distance between the transmitter and rear speaker.
Leave ample distance between the transmitter and rear speaker ac-
cording to the user's using environment when performing the ad-
justment.

Procedure:
1. Connect the transmitter to the front speaker and turn the power

supply on.

2. Adjust IFT103 of the RECEIVER board, and adjust so that the

voltage of the two ends of TP102 becomes 0V. (RECEIVING
FREQUENCY adjustment)

3. Adjust RV102 of the RECEIVER board of the rear speaker until

D109 turns green. (MUTING LEVEL adjustment)

4. Turn OFF the power turned on at STEP 1.
5. Check that D109 of the RECEIVER board of the rear speaker

becomes red.
If green, adjust RV102 so that it turns red, turn ON the power
again, and repeat from step 3.

6. After adjusting, check that D109 becomes red when the power

of the front speaker is turned OFF and it becomes green when
the power is turned ON.