General Information; Diagnosis; Trouble Shooting - Pioneer SX-315 Service Manual

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7. GENERAL INFORMATION

7.1 DIAGNOSIS

7.1.1 TROUBLE SHOOTING

The Protection circuit is activated by DC or overcurrent detection.
Detection method: The voltage at the Protection port (Pin 7) of the microcomputer becomes low.
Time required for detection: 2.5 sec after the power is turned on
Operation when the Protection circuit is activated:
• Mute: ON
• Speaker Relay: OFF
• The unit immediately enters Standby mode.
Recovery method: Press the STANDBY key twice.
When the DC detection circuit is not normal
• BD501 and BD502 are in failure or their peripheral circuits are short-circuited.
• Power amp section is in failure.
• Protection circuit is in failure.
• Microcomputer is in failure. (pin 7: protection)
When the overcurrent detection circuit is not normal
• Power amp section is in failure.
• Protection circuit is in failure.
• Microcomputer is in failure. (pin 7: protection)
• Only when the signal is output, short-circuiting of the output circuit is suspected.
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