Pioneer VSX-521-K, Service Manual

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51
VSX- 8 21-K
5 6 7 8
5 6 7 8
A
B
C
D
E
F
Simultaneously holding the [AD V A N CD SURROU N D] and [STA N DBY/O N ] keys on the
front panel pressed for 2 seconds will cancel Key Input Inhibition mode after a DC error
detection and turn the unit O
N .
[Detailed explanations]
3.3 TEMP (AMP overheat) error detection
For detection of a TEMP error, the unit monitors both the TR_DET and PROTECT2 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.
FL Display Description of Indications Key Operation
3.4 How to cancel the status after detection of the DC error
(STA N DBY state)
( N ormal display)
usually
N ormal display
Time (sec.)
[AD V A N CED SURROU N D]
+ [STA N DBY/O N ] keys
(press and hold the keys
for 2 seconds.)
Counter: Temp2
TR_DET
P6_4 (34 pin)
(TRTHER_DET from AMP Assy)
N ormal Operations
Deduct 3 from the current V OL
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 TR_DET detection
is prohibited for 2 min, the PROTECT 2 function will
be activated.
Prohibit detection of
TR_DET for 2 min.
*2
Is TR_DET detected?
Is the V OL value 5
or less?
N o
N o
N o
Yes
Yes
Yes
Detection of TR_DET
is resumed after 2 min.
Is TR_DET detected?
Counter: Temp1
PROTECT2
PL2_1 (71 pin)
(RADI_DET from AMP Assy)
N ormal Operations
MUTE O N and ALL Speakers/
Phones Relay are set to OFF.
Have "O
V ERHEAT" flashing
on the FL display for 3 sec.
*3
*3: The detection interval must be 1 sec or less.
Timer START is performed
for 3 sec.
PROTECT2 detected?
N o
N o
Yes
Yes
After 3 sec,
PROTECT 2 is rechecked.
Is PROTECT 2 detected?
POWER OFF (STBY)