TC-TX313, TC-TX515 (serv.man2) - Sony Audio Service Manual (repair manual). Page 4

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The set allows you to check the items of the test mode although this
may not be directly related with the adjustment.

1 Setting/Releasing the Test Mode:

1) Setting

With power OFF, short between test pin 1 and pin 2 of
CN09 on the LOW-VOLTAGE board. (See page 15.)
Then, turn power ON to enter the test mode.

2) Releasing

Open between pin 1 and pin 2 of CN09.

2 Items of Test Mode

1) Memory Stop
1-1) In side A record mode, press the REW ( 

0 ) button.

The tape is rewind to the start point of recording and stopped.

1-2) In side B record mode, press the FF ( 

) ) button.

The tape is rewind to the start point of recording and stopped.

2) Memory Play
2-1) In side A record mode, press the FWD Auto Play

( 

” + 0 ) buttons simultaneously. The tape is rewind to

the start point of recording and FWD played.

2-2) In side B record mode, press the REV Auto Play

( 

“ + ) ) buttons simultaneously. The tape is rewind to

the start point of recording and REV played.

3) All LED Flickering

When no tape is inserted, all LED indicators are flickering.

4) Aging Operation

When tape with record erase preventing claw is inserted for
both sides A and B, enter the aging operation start command
by pressing  

p  and  CD SYNC  simultaneously. The system

will change the direction to one side and perform the
following operations:

1 Rewind in REW mode until side A of tape is stopped.
2 Playback tape in FWD mode for 1 minute.
3 Pause mode.
4 Record tape for 3 minutes.
5 Forward tape in FF mode to the end of side A of tape.
6 Shut off and switch to side B.
7 Playback tape in REV mode for 1 minute.
8 Pause mode.
9 Record tape for 3 minutes.
!º Forward tape in FF mode to the end of side B of tape.
!¡ Shut off and switch to side A.
!™ Repeat the procedure from 2 to !¡.
!£ Pressing the STOP ( p ) button will release the set from

these operations.