BD-HP22SB
4 – 7
The LED power indicator fails to light up.
Is the power as specified?
YES
NO
Check each transistor, LED and the current-limiting resistor.
Is there the "H" potential at pin (18) (LED_STBY) or pin (17)
(LED_PON) of SC2504?
Is the "H" potential outputted from pin (53) (LED_STBY) or pin
(51) (LED_PON) of IC2504?
Check the FFC between SC1101 and SC2501.
YES
Check the line between IC2504 and SC2501.
YES
Is the "H" potential applied at the base of Q1111 or Q1112?
YES
POWER FLOW CHART No.1 or POWER FLOW CHART No.3
NO
NO
Check IC2504 and its peripheral circuits. Or replace IC2504 as
required.
NO
Is there the "H" potential at pin (4) (LED_STBY) or pin (5)
(LED_PON) of SC1101?
Check the line between SC1101 and the base of each transistor.
YES
NO
FLOW CHART No.4
The LED mode display indicator fails to light up.
* White LED: Blinking while the disc is being loaded.
Lights up when the disc has been recognized.
* Blue LED:
While the disc is being played back.
Is the "H" potential applied at the base of Q1104 or Q1105?
NO
NO
Check the line between SC1101 and the base of each transistor.
Is there the "H" potential output from the following pins in each
mode: Pin (54), (LED_BD_MODE), pin (57) (LED_DVD_
MODE), pin (55) (LED_BD_PLAY) or pin (58) (LED_DVD_
PLAY), all on IC2504?
Check IC2504 and its peripheral circuits. Or replace IC2504
as required.
Check the line between IC2504 and SC2501.
YES
Is there the "H" potential at pin (18) (LED_BD_MODE) or pin
(17) (LED_BD_PLAY) of SC1101?
YES
Check each transistor, LED and the current-limiting resistor.
YES
NO
Is there the "H" potential at pin (5) (LED_MODE_R) or pin (4)
(LED_PLAY_R) of SC2504?
Check the FFC between SC1101 and SC2501.
YES
NO
FLOW CHART No.5
Summary of Contents for BD-HP22SB
Page 46: ...BD HP22SB 7 15 MEMO ...
