XV-EV61
130
1
2
3
4
1
2
3
4
C
D
F
A
B
E
7.1.7 PROTECTION CIRCUIT
If the TIMER LED on the front panel flashes, check the protection circuit.
Note: If the protection circuit activates, the unit will not recover for 60 seconds even if the AC power cord is disconnected then reconnected.
If you activate Service Test mode, the protection circuit becomes invalid, which makes diagnosis easy. (To activate Service Test mode,
while connecting SERVICE port (IC5501 pin69)to "+5V", connect AC power cord.)
There are three types of operations for the protection circuit, which are indicated on the LCD display when Service Test mode is entered:
(Short W138 and W139)
POW WNG: The unit was shut down because of an abnormality in the AMP system. (The PROTECT line operates at the MID level.)
POW ERR: The unit was shut down because of a failure in the AMP system. (The PROTECT line operates at the LO level.)
DVD ERR: The unit was shut down because of a failure in the DVD system. (The VDET line operates at the HI or LO level.)
Conditions for the protect circuit operations
Protection circuit that activates against a POW ERR error
Voltage
Conditions
FL display in Service Test mode
PROTECT
HI level
>3.55V
Normal
MID level
1.8V - 3.5V
The unit is shut down because of an abnormality.
LO level
<1.8V
The unit is shut down because of a failure.
POW ERR
VDET
HI level
>4.25V
The unit is shut down because of a failure.
DVD ERR
MID level
3.3V
Normal
LO level
<2.5V
The unit is shut down because of an abnormality.
DVD ERR
The possible failures for each error message are as follows:
POW ERR:
• The Speaker terminal became overloaded because of short-circuit. (See
1
.)
• The main power supply became LO level because of short-circuit or disconnection of connectors. (See
2
.)
• Disconnection of the FAN connector or interruption of rotation of the fan (See
3
.)
• DC was generated at the output because of a failure in the AMP system, etc. (See
4
.)
• Abnormal temperature was detected by the thermistor. (See
5
.)
DVD ERR:
• An error was generated in the main power supply inside the DVDM. (See
6
.)
1
When the Speaker terminal becomes overloaded
Q3601
Q3639
Q3640
B
E
C
+5V
D3603
DAP202K
C3633
10/50
D3601
R3607
0
R3668
22k
R3669
22k
R3639
27k
R108
27k
Front L ch
to
XPROTECT
GND FL
R3601
1.8k
R3603
33k
B
A
VD+5
+
SP-TERMINAL
Assy
N
EVOL Assy
K
In Normal mode, the speaker (6 ohms) is connected between the
FL and GND FL points. Because the voltage at Point
A
is higher
than that at Point
B
, Q3601 does not operate.
If the resistance between the FL and GND FL points becomes
1.83 ohms or less, Q3601 begins to operate, Q3639 is turned on,
Q3640 (E, C, and B)is turned on, and the level of XPROTECT
becomes MID.
→
The microcomputer detects the XPROTECT level and
shuts the power to the unit off.
→
After power off, unit recovers. (no reed to unit for 60
seconds)
Содержание XV-EV31
Страница 34: ...XV EV61 34 1 2 3 4 1 2 3 4 C D F A B E 3 7 DVDM ASSY 3 3 B 3 3 B 2 3 ...
Страница 50: ...XV EV61 50 1 2 3 4 1 2 3 4 C D F A B E 3 15 MIC ASSY J H P ASSY XWZ3731 O O K CN3008 JA5401 JA5402 ...
Страница 55: ...XV EV61 55 5 6 7 8 5 6 7 8 C D F A B E AUDIO SIGNAL ROUTE FL M The power supply is shown with the marked box ...
Страница 58: ...XV EV61 58 1 2 3 4 1 2 3 4 C D F A B E 3 19 PRIMARY ASSY P J3009 K 1SS133 1SS133 ...
