Sony BDP-S300 - Blu-Ray Disc Player, Руководство по обслуживанию

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5-15
Inactive keys on main set
Symptom improved if FL board is replaced? Replace the Main board
Yes
Yes
Which line of keys is inactive?
Key 0 t Go to “Key 0 is inactive”
Key 1 t Go to “Key 1 is inactive”
Flowchart No.2
FL Section
No
Key 0 is inactive (Power button is active)
Is about 5V present in CN100 28pin without pressing a key? Check 5V line, R117 periphery and conductors on the FL board.
If faulty, replace the FL board.
Yes
Does the potential of CN100 28pin (Key 0) change
when CN101 3pin and 1pin are short-circuited?
No
Check the resistors and conductors on Key 0 line.
If faulty, replace the FL board.
Check resistance of resistors on Key1 line.
Also, check peripheral conductor patterns.
Yes
No
Key 1 is inactive
Is about 5V present in CN100 28pin without pressing a key? Check 5V line, R120 periphery and conductors on the FL board.
If faulty, replace the FL board.
Yes
Does the potential of CN100 8pin (Key 1) change
when CN101 4pin and 1pin are short-circuited?
No
Check the resistors and conductors on Key 1 line.
If faulty, replace the FL board.
Check resistance of resistors on Key1 line.
Also, check peripheral conductor patterns.
Yes
No
Reference: Relation between buttons and voltages
KEY
KEY0
KEY1
Specified voltages [v]
SPEC CENTER
PLAY
0 0
OPEN/CLOSE
0.72~0.80
0.76
PAUSE
NEXT
1.36~1.50 1.43
PREVIOUS
2.13~2.35 2.24
P_ON
STOP
2.78~3.07
3.43~3.79
4.06~4.49 2.92
3.61
4.27