Processing In Abnormality; Speaker Short-Circuit; Circuit Configuration; Specifications For Port Monitoring - Pioneer PDP-5020FD Service Manual

1
A

[3] PROCESSING IN ABNORMALITY

Speaker short-circuit

Circuit configuration

IO_AUDIO Assy
B

Specifications for port monitoring

Port Name SD/PD Indication
A_NG_B AUDIO
OTW AUDIO
Operation specifications of the main CPU
(1) Establish the short-circuit of the speaker by the main CPU
C
• After a warning indication is displayed for 5 sec, a shutdown is generated (the blue LED flashes 5 times).
• A warning indication is displayed for all input-signal types.
• Example of a warning indication: "The speaker terminals are short-circuited. After reconnection, turn the unit on again."
(2) Display conditions
When the panel is on: A warning indication is displayed immediately.
When the panel is off: A warning indication is not displayed immediately but is displayed when the panel is turned on.
Note: A warning indication is displayed each time the panel is turned on if the conditions for a shutdown persist.
Conditions for resetting the circuits
The circuits will be reset upon Standby ON/OFF.
D
E
F
84
1
2
OTW
DIGITAL
POWER
A_NG_B
AMP IC
Active
Shutdown occurs when the signal is "L."
30 mS ∗ 10 times
Shutdown occurs when the signal is "L."
120 mS ∗ 3 times
PDP-5020FD
2
3
MAIN Assy
OTW
A_NG_B
PULL_D
PULL_D
Monitoring conditions
RST4 = "H" (always)
The main CPU operations described below will be
(Monitoring starts 2 sec
performed when either "A_NG_B = L" or "OTW = L" is
after the above conditions
detected (established) under the monitoring conditions.
are established.)
3
4
IF_UCOM
MAIN_UCOM
Operation
4