Alpine Ai-NET CHA-1214 Service Manual page 16

CHA-1204
Judgments (2)
Disc detection
not yet completed.
AN8806SB
(IC102) #27 FEOUT
Is there output of
an S-curve ?
MN66271 (10101)
is faulty
Judgments (5)
'TR balance adjustment
hot yet completed
(16101) #31
25V?
AN8806SB (IC 102) is
faulty or surrounding
capactors/resistors
are faulty
Is there
laser current ? APC circuit is faulty
v
Laser current = 0 (A)
*RI41
YES Note:
Do not connect or disconnect a DC
voltmeter while the set is drawing current.
Doing so may destroy the laser diode.
Is the
laser current within
+5mA of the indication
on the flexible
wiring
* Internal temperature of the set is room
YES temperature (20°C)
Does
the objective
lens of the pickup
move up and
down ?
AN8806SB (C102) is fault
or surrounding capacitors
/resistors are faulty
(R104 , C122)
Isa
triangular
wave of MN66271
MN66271 (1C101)
is faulty
triangular
waves of BA6791FP
{1C103) #26 (4.1V)
and #27 (3.8V)
utput 2
BA6791FP (IC103)
is faulty
YES
Pickup is faulty
* Focus coil is open.
MN66271 (1C101)
is faulty
*R102
cno
Judgments (3)
TR rough gain adjust-
ent not yet completed,
AN8806SB (/C102) is faulty
or capacitors/resistors
surrounding TEQUT
are faulty
*RIOS C123
MN66271 (iC101)
is faulty
Judgments (4)
FO balance adjustment
not yet completed.
Is the
Does the output of
focus servo
INGE:
MN66271 (IC 101)
come on ? eceeT| Ue10))
#28 26V?
* Is the output of
MN66271 (IC101)
YES #11 (FLock) "L'?
Is the
output of
MN66271 (16101)
#28 2.5V7
Does
the tracking servo
come on ?
MN66271 (IC 101)
is faulty
* Is the output of
MN66271 (IC101)
YES #12 (TLock) *L"?
External capacitors of
AN8806SB (IC 102) #11
and #12 are faulty or
AN8806S8B is faulty
*CIL2, 113, 118
NO
Is the
output of
MN66271 (1C101)
#30 2.7V 2
AN8806SB (IC102) is
faulty or surrounding
capacitors/resistors
are faulty
* R103, C109
BA6791FP (ICt03)is
faulty or surrounding
capacitors/resistors
are faulty
* R116, 917, 118,131
Cii6
E131
* Focus coil is open or
tracking coil is open
Judgments (6)
FO fine gain adjustment
not yet completed.
TR fine gain adjustment
not yet completed.
Is the gain normal 7
MN66271 (IC101)
is fautty
Both focus and tracking are
within 0 + 3.dB
is the
external CR
fitter circuit
normal 7
Pickup is faulty
Extemal CR filter
és faulty
(4A,