Service Mode
5
4
3
2
1
6
D
C
A
B
D
C
A
B
5
4
3
2
1
6
VSX-330
[3] The unit’s operation when a error is detected (2/3)
3.3 TEMP (AMP overheat) error detection
For detection of a TEMP error, the unit monitors both the THER_DET and OVERLOAD & DC_DET signals.
If a TEMP error is detected, the processes shown below will be performed. The processes shown below are rough
operational specifications and are not the actual commands from the mounted components.
After a TEMP error is detected, the count of protection activation detections will be updated.
Counter: Temp2
PROTECT2
P2_2 (pin 70)
(THER_DET from MAIN Assy)
Normal Operations
Deduct 3 from the currentVOL
value. Have "TEMP" flashing
on the FL display for 3 sec.
POWER OFF (STBY)
*1
*1: The detection interval must be 1 sec or less.
*2: If PROTECT 2 is detected while THER_DET detection
is prohibited for 2 min, the PROTECT 2 function will
be activated.
Prohibit detection of
THER_DET for 2 min.
*2
Is THER_DET detected?
Is the VOL value 5
or less?
No
No
No
Yes
Yes
Yes
Detection ofTHER_DET
is resumed after 2 min.
Is THER_DET detected?
Counter: OVER / DC
PROTECT1
P0_3 (pin 85)
(OVERLOAD & DC_DET from AMP6 Assy)
PROTECT1 Function
<PROTECT1: Voltage at Pin 85>
NORMAL: 3.3 V
When ASO destruction (excess current) is detected: 0.83 V
When DC is detected: 1.45 V
<Operation upon detection>
When ASO destruction is detected: POWER OFF (STBY)
When DC is detected:
CASE 1 (Instantaneous detection [for less than 3 sec]): Speaker RELAY OFF
CASE 2 (Continuous detection [for 3 sec or longer]): Shutdown and flashing of the HDMI LED
(To turn the unit back ON again, simultaneous pressing of the two keys is necessary.
-> See "3.4 How to cancel the status after detection of the DC error".)
Normal Operations
MUTE ON and ALL Speakers/
Phones Relay are set to OFF.
*3
*3: The detection interval must be 1 sec or less.
Timer START is performed
for 3 sec.
DC detected?
Is ASO detected?
No
No
Yes
Yes
After 3 sec,
DC is rechecked.
Is DC detected?
POWER OFF (STBY) and
HDMI LED flashing.
Yes
POWER OFF (STBY)
No
