HST-SE581, SEN-R4820, SEN-T481 - Sony Audio Service Manual (repair manual). Page 5

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[Fluorescent Indicator Tube, LED All Lit, and Key Check Mode]
1. When the plug is inserted into the outlet while pressing the

MEMORY SCAN  button, the fluorescent indicator tube and
LED will light up completely.

2. The mode changes as follows each time the  BAND  button and

WOOFER ON/OFF  button are pressed together after 1.

Sequence of Service Modes

*1 For checking if the fluorescent indicator tube and LED are lit

completely

*2 Model name and destination are shown in the destination display

mode.

*3 When the KEY check mode is set, “KEY 0”is displayed on the

fluorescent indicator tube. Each press of the button is counted.
(This excludes the  

1/u  button)

Buttons pressed once will not be counted when pressed again.
When all keys are pressed, “KEY END” appears.

*4 When the AMP check mode is set, “AMP” is displayed on the

fluorescent indicator tube.
Select any desired mode by pressing the  TONE  or  CENTER
or  REAR  or  WOOFER  button.  After a mode is selected,
press any of the  DOLBY  or  HALL  or  SIMULATED  button
as shown below to change the amplification level.

3. To exit the test mode, press the  

1/u  button, or press the p

(STOP) button of the deck A during the modes except the key
check mode.

[TC test mode]
1. Insert a playback tape into the deck A and a record tape into

the deck B.

2. While the power cable is disconnected from AC outlet, press

the  

1/u   switch.

3. While pressing the DUBBING SPEED HIGH button, connect

the power cable to the AC outlet.

Audio dubbing from deck A to Deck B starts.
When the  

0  button or the  )  button (during reverse

recording) of the deck B is pressed during dubbing, the tape
returns to the recording start point and playback starts.
When the  DUBBING SPEED HIGH  button is pressed during
dubbing, the high speed dubbing is performed.

[TC aging mode]
1. Turn on the main power.
2. Press the  TAPE  button. Insert a playback tape into the deck

A and a record tape into the deck B.

3. Set the  DIRECTION  switch to        .
4. Press the  WOOFER  and  

p (STOP) button of the deck A at

the same time to enter the aging mode.

TONE

CENTER

REAR

WOOFER

DOLBY

–10 dB

–15 dB

–15 dB

–24 dB

HALL

0 dB

0 dB

0 dB

0 dB

SIMULATED

+10 dB

+6 dB

+6 dB

+8 dB

Fluorescent Indicator
Tube and LED Check Mode

*1

Destination display mode

*2

•

 

 

Press the  BAND  button and 

   WOOFER ON/OFF  button at the same time.

KEY check mode

*3

•

 

 

Press the  BAND  button and 

   WOOFER ON/OFF  button at the same time.

•

 

 

Press the  BAND  button and 

   WOOFER ON/OFF  button at the same time.

AMP check mode

*4

•

 

 

Press the  BAND  button and 

   WOOFER ON/OFF  button at the same time.

These operations are repeated.

5. How to exit the TC aging mode.

Press any keys related to the TC deck.

[Backup Clear Mode]
1. While pressing the  DOLBY  key, connect the power cable to

the AC outlet. All preset data is cleared.

Deck A rewinds (REW) up to the tape top,
Deck B rewinds (REW) up to the tape top,
Deck A plays back (FWD) for one minute, then stops (STOP) 
momentarily,
Deck A plays back (FWD) for three minutes,
Deck A runs in fast forward (F. FWD) up to tape end,
Deck A plays back (REV) for one minute, then stops (STOP) 
momentarily,
Deck A plays back (REV) for three minutes,
Deck A runs in fast reverse (REV) up to tape top,
Deck B plays back (FWD) for one minute, then stops (PAUSE) 
momentarily,
Deck B records (FWD. RECORD) for three minutes,
Deck B runs in fast forward (F. FWD) up to tape end,
Deck B plays back (REV) for one minute, then stops (PAUSE) 
momentarily,
Deck B records (REV. RECORD) for three minutes,
Deck B runs in fast reverse (REV) up to tape end,   

<Repeat>