DIGITAL MAIN ASSY
E
DIGITAL MAIN Power Supply Failure Detection
Item Purpose Detection Method Status of Equipment Warning Indication Remarks
DIGITAL
MAIN
power
supply
failure
detection
(*1) Conditions when XVDDERR becomes "L"
1. Q1997 turns ON : When V+6DDD becomes higher than the setting value, Q1997 becomes ON.
2. Q1998 turns ON : When V+5_DDD becomes higher than the setting value, Q1998 becomes ON.
3. Q1999 turns ON : When V+13_UN becomes lower than 3.8 V, Q1999 becomes ON.
When PWRGD of IC1900 becomes low (V+5HD becomes lower than the setting value), Q1999 becomes ON.
When PGOOD of IC1930 becomes low (V+1R8_HHH or V+3R3_HHH drift from the setting value), Q1999 becomes
ON.
When V+6_DDD becomes lower than 3.8 V, Q1999 becomes ON.
Detect abnormal
voltage in the
Digital Power
Supply circuit
Detect when XVDDERR
port becomes "L" (*1).
(IC8001 70 pin)
Shuts down Blinks Center Blue LED
During Standby mode, simultaneously press and hold the "↓" and "MULTI-ZONE ON/OFF" keys
for 5 seconds.
[How to Enter Release Mode]
V+5R6_U
D1997
1SS352
R1999
4.7k
V+13_UN
PWRGD
IC1900
PGOOD
IC1930
D1998
DAP202U
RN4903
Q1999
RN4903
Q1999
D1999
UDZS5R6(B)
R1997
1k
R1998
100
C1999
NM
C1998
0.1u/10
C1997
0.1u/10
Q1998
2SC4081(QR)
GNDD
R1996
4.7k
D1996
1SS352
Q1997
2SC4081(QR)
C1996
NM
R1995
100
R1994
1k
D1995
UDZS6R8(B)
R1988
NM
R1989
NM
C1991
NM
Q1996
NM
D1994
NM
V+13_UNV+5_DDD
V+6_DDD
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