DVP-NS305, DVP-NS310, DVP-NS315, DVP-NS405, DVP-NS410, DVP-NS415, HT-1700D - Sony DVD Service Manual (repair manual). Page 79

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2-3. Each Self Check Function
Each Self Check function tests the FLD display, LED display, and
key input.

2-3-1. FLD and LED All ON
2-3-1-1. Transition Keys in Self Check Mode
•  x  key and  Z  key on the main unit
• 

%

  key on the main unit and the remote commander

2-3-1-2. Operation and Display
In this mode, all LEDs except STANDBY LED and all segments of
FLD turn ON.

2-3-2. Main Unit Key Name Display and Key Code Display
2-3-2-1. Transition Keys in Self Check Mode
• Keys on the main unit except keys transited in Self Check Mode

2-3-2-2. Operation and Display
When a key on the main unit is pressed in the Self Check mode, the
name of that key is displayed on the FLD. Also, the key name display
and the key code display can be switched with the [DISPLAY] key on
the remote commander. “NOTHING” is displayed when nothing is
entered. Also, VIDEO CD, DVD, and CD segments turn on when a
communication error occurred.

• FLD display (at input of   H  key on the main unit)

Input

IC404: Pin No. (Signal)

Voltage [V]

Pin ed

 (BNRKEY)

Pin ef

 (PLAY)

Pin eg

 (O/C)

Pin eh 

(TVS)

0 – 0.2

–

PLAY

OPEN/CLOSE

TVS

0.6 – 0.82

–

NEXT

–

PIC MODE

1.16 – 1.47

–

PREVIOUS

–

MODE

1.8 – 2.12

–

PAUSE

–

–

2.48 – 2.7

–

STOP

–

–