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XR-A550MD
QQ
3 7 63 1515 0
¶ Normal playback
It is confirmed that EEPROM value is correct in Test mode:
Does the system perform initialization correctly when
playing back high-reflection disc?
Does the disc rotate correctly?
Does the system try to repeatedly read TOC when low-
reflection disc is played back?
Use a high-reflection disc to confirm the position of the
read-in switch in Measurement mode among the
adjustment items.
TE
L 13942296513
¶ Audio playback circuit
No sound is output even though indication of playback time advances during playback in Normal mode:
Do audio output waveforms appear for Pins 24 to 26 of
IC1701?
Do audio output waveforms appear for Pins 22 and 24 of
CN1901?
Check the substrate of the MD MAIN Assy.
www
.
106
http://www.xiaoyu163.com
NO
YES
YES
YES
YES
x
ao
u163
y
i
http://www.xiaoyu163.com
2 9
8
YES
Does indication of playback time advance?
Check IC1201.
Does the read-in switch turn ON in the most inner
NO
circumference of pickup in Test mode? (Is Pin 6 of
IC1401 at "L" level?)
Check SW1953, the soldered portion of the MD MECHA
SW Assy, and portion around Pin 1 of CN1601.
NO
Unused new discs have no TOC recorded. Replace with
a recorded low-reflection disc.
Q Q
3
6 7
1 3
1 5
NO
Check Pins 70 to 72 and 74 of IC1201, and Pins 12, 16,
17 and 19 of IC1701.
NO
Check the connection line between IC1701 and CN1902.
co
.
9 4
2 8
NO
NO
0 5
8
2 9
9 4
2 8
m
9 9
9 9
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