Pioneer XV-HTD7 Service Manual page 96

1
Protection Specifications and Service Mode
Protection Specifications
The system microcomputer (AF Assy IC5501) for this unit always monitors if abnormality of the power is generated, and as soon as an
A
abnormality is detected shuts off the power. The specifications of the microcomputer terminal for monitoring are as follows:
Name of microcomputer terminal
Monitoring item
In normal conditions
In abnormal conditions
Voltage at terminal
In failure
Monitoring start time
Time required for determining abnormality
B
In abnormal conditions or in failure, the TIMER LED flashes after the power is shut off. If the power was shut off because of an
abnormality, it can be turned on by pressing the STANDBY/ON key. However, if the power was shut off because of failure, for one minute
after a shutdown the STANDBY/ON key is disabled in order to protect against possible ignition of fumes. If the AC power cord is pulled
out during this one minute of standby, when the AC power cord is reconnected, the STANDBY/ON key will still be disabled until the
remaining seconds have elapsed.
This unit has Service Test mode for analyzing the above power abnormality. Its specifications are as follows:
1. Specific conditions for Service Test mode
• VDET is neglected.
• XPROTECT is neglected.
• Even if the unit is urgently shut down in failure in Normal mode, you can turn it on without waiting for one minute.
C
2. How to enter Service Test mode
• While holding the DISK 1 key and STOP key pressed, connect AC power cord.
3. How to quit Service Test mode, and the conditions for quitting
• To quit Service Test mode, turn the power off or disconnect the AC power cord.
• When quitting Service Test mode, only data on protection in RAM are cleared.
4. Indications when Service Test mode starts
• Indications on the FL display when Service Test mode starts differ depending on whether the unit was turned off normally or if the unit
was urgently shut down because the abnormality of the power, as described below.
D [After the power is turned off normally]
FL display
FL display V o l u m e
FL display D V
[After the power is shut down because of
a failure in the AMP system]
FL display P R T C T
FL display V o l u m e
E
FL display D V
5. Operations during Service Test mode
• Basically, operations in Service Test mode are the same as in Normal mode. However, to clarify that it is in Service Test mode, during
this mode, when functions are changed, the indications on the FL display become as follows:
[Functions] [Indications on the FL display]
DVD/CD
TUNER
LINE1
F
96
1
2
Abnormality of AMP-system power
Short-circuiting of the SP terminal, etc.
0.71 Vdd∗ or more
0.36 Vdd-0.71 Vdd∗
0.36 Vdd∗ or less
1.5 sec after power is turned on
0.5 sec after detection
W e l c o m e !
0
S E R V I C E
E R R
0
S E R V I C E
D V S E R V I C E
T X S E R V I C E
L 1 S E R V I C E
2
3
XPROTECT (Pin 22)
[After the power is shut down because of
an abnormality in the AMP system]
FL display
FL display
FL display
[After the power is shut down because of a failure
in the DVD system]
FL display
FL display
FL display
[Functions]
LINE2
TV
XV-HTD7
3
4
VDET (Pin 17)
Abnormality of power inside the DVDM
Assy
0.5 Vdd-0.85 Vdd∗
0.85 Vdd∗ or more
0.5 Vdd∗ or less
1.5 sec after power is turned on
0.5 sec after detection
∗Vdd = Approx. 5 V (depending on the unit)
P R T C T W N G
V o l u m e 0
D V S E R V I C E
D V D P R T E C T
V o l u m e 0
D V S E R V I C E
[Indications on the FL display]
L 2 S E R V I C E
T V S E R V I C E
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