Pioneer XR-A550MD Service Manual page 107

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¶ Recording/playback operations
Insert a low-reflection disc to confirm audio output during playback in Normal mode, then set the system to Recording/Playback Test mode.
The system does not record from the starting address.
Does RF waveform appear for TP1274 or Pin 1 of IC1201
when the disc is played back after recording ?
Are recording levels of Pins 3, 26 and 39 of IC1401 and
Pins 9 and 19 of CN1101 different from playback levels
Does RF pattern appear for Pin 50 of IC1201 ?
Check IC1251, Q1251 to 1254 and CN1252.
Do input waveforms appear for Pins 18 and 20 of
CN1902 during AUX input recording in Normal mode ?
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Are input waveforms supplied to Pins 3 to 5 of IC1701?
Check Pins 70 to 73 of IC1201 and IC1701 and
surrounding portions.
¶ The focus servo does not function
Is waveform of Pin 27 and 28 of IC1101 correct at the
focus gain rough adjustment step in Test mode?
Is Pin 81 of IC1201 changes from "H" to "L"?
Does pulse waveform appear for Pin 82 of IC1201?
Does pulse waveform duty of Pins 18 and 19 of IC1201
change?
Do waveforms change at Pins 12 to 15 of IC1601?
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Do waveforms of Pins 2 and 4 of CN1101 change?
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YES
Is the disc recording enabled ?
YES
NO
Check IC1401 and CN1101 and surrounding
portions.
NO
Check IC1201 for defective soldering.
Check the substrate of the MD MAIN PCB Assy.
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NO
Check connection between IC1701 and CN1902.
NO
Check waveforms of Pins 9 and 10 of IC1101 and
soldering.
NO
Check waveforms of Pins 8 and 9 of IC1201 and
soldering.
NO
Check soldering and parts of IC1201.
NO
Check soldering and parts of IC1601.
NO
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Check pickup assy and CN1101.
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XR-A550MD
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