Alpine Ai-NET CHA-1214 Service Manual page 15

CHA-1204
IV. Fault Diagnosis Chart
Main Flow Chart
Error monitor check
(A)
Fault item Judgment Fault item Judgment
TR balance
offset adjustment
Offset adjustment | ____ 41)
balance adjustmen|
adjustment
bo... (5)
(AOC2)
not completed.
(ABC2)
not completed.
FO ; F
Disc : ; fi i FO fine gain
F
Disc detection
fine gain
:
detection =>—~-———*]
hotcompleted.
b----- 2
i
adjustment = ------- (6)
(DDT)
not completed.
+2)
adjustment
not completed.
FO FO offset iia, Ohh TR fine gain
offset adjustment
adjustment
= F--=-- <1)
adjustment
adjustment = }----- +6)
(AOC1) not completed. (TAGC) not completed.
FO F
' FO rough gain
aeicnt
adjustment
=
p=----- <1)
Does not play.
F----- +7)
(AGC1) not completed.
TR F
i
TR rough gain
.
apie
adjustment
-n--- +3)
fr Soe
Scratched disc
(AGC2)
not completed.
playability
play fault
FO FO balance
balance adjustment adjustment = Fe---- -(4)
{ABC 1) not completed.
(A)
* Notes
1) When more than one LED are light, perform a circuit check according to the order of the main flow chart.
2) Proper soldering of patterns and IC pins is a precondition. Accordingly, when an IC fault is reached in the flow
chart, do not replace the part immediately; check the soldering (for loose and bridges).
3) Faults such as faulty capacitors and resistors in the flow include bad parts, different constants, looseness,
and cracks.
4) Use track 6 of A-BEX TCD-721 for the scratched disc playability check.
Judgments (1)
TR offset adjustment FO offset adjustment FO rough gain adjustment
not yet completed. not yet completed. not yet completed.
Are the
outputs from
AN8806SB (iC 102)
#27, #29, and
#30 2.5V?
MN66271 (1C101)
is faulty
AN8806SB (1C102) is
faulty or surrounding
capacitors/resistors
are faulty
* R102, 103, 104
C109, 110, 122