ST-SE520 (serv.man2) - Sony Audio Service Manual (repair manual). Page 4

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To skip “1. Display Tube Key Check Mode”, and factory preset:

(1) Turn OFF the power.
(2) While pressing 

3 and  MENU  together, turn ON  U .

Set to the reception frequency that the circuit can receive (FM:STEREO stations). (Set the input level to above 70 dB.)

(1) Turn OFF the power.
(2) While pressing 

4 and  MENU  together, turn ON  U .

• The items in the following table will be checked automatically in order every 2 seconds.

AST signal =LOW

IF COUNT OK

SI LEVEL

70dB

ST signal=LOW

TUNED

IF

SIG L

ST

OK or NG

OK or NG

OK or NG

OK or NG

OK or NG

OK or NG

OK or NG

TB 101 NG

TB 101 NG

TB101 NG

Clears all the RAMs and sets the initial state
(1) Turn OFF the power.
(2) While pressing 

5 and  MENU  together, turn ON  U .

NOTE : This model have PILOT/POLAR switching function. (Normally, do not use.)

(1) Turn OFF the power.
(2) While pressing 

2, turn ON  U .

Switches between PILOT and POLARITY and display the state.
Switches between PILOT and POLARITY each time this mode is performed.
Return the original state after completing the process.

Display

Items

FM STEREO

AM

Display

NG

>

=

IC 201 NG

RV201 adjustments