Abstract: An apparatus for testing an audio component, such as a compact disc player, automatically runs tests iteratively and suppresses spurious errors generated between test cycles. The player is configured to play a prerecorded test disc encoding a test tone for a certain period of time. The test tone is monitored and changes in frequency or amplitude of the generated signal cause a latch to be set and an interrupt signal to be sent to a controller. The controller increments an error count in response to the interrupt and resets the latch. At the end of the test cycle an end-of-test tone is mixed with the test tone. When the end-of-test tone is detected the latch is disabled for a period of time to prevent signals generated as the player resets to result in spurious errors.