Harman Kardon HD7725 - Page 13

@) When Laser not emitted.
NO
Is pin 8 of 10401 at low level?
from pin 28 of IC101?
Is the voltage of Q201
collector OV (law)
Defective disc
HD7725
Is @ focus OK siggrial (Piggy) ae |
IC101 defective
Q201 defective
NO NO
Is
pickup
back
atthe
-—————|_Is
data
transferred
from
pins
p——t
C401
defective
inéermost
circuit?
12-15
or
10401?
ee
YES
: F NO
is.voltage obtained at pin 25 C201 defective
of IC1027
YES
A ; NO
Is voltage obtained at pin 3 1C103 defective
of IC103?
YES
Feed motor, connector od DC
mechanism defective
Does the pickup stop 1C103 defective
after returning to the NO NO aE a
innermost circuit? Is the sensor output of the linit Limit switch or connector
switch input to pin 16 of IC407 defective
YES
1C401 defective 1C401 defective
; NO :
Is the voltage at pin 29 of IC101 OV R110 defective
when pin 35 of IC401 is at low level? rm a Dad
¥ YES
Is 2.0V laser power supplied to the _ R101 defective
base of Q101? er
YES
Defective pickup
When Laser is emitted.
: NO NO
Does the pickup lens move FP s|s a focus error signal output 1C102 defective
up and down? from pin 37 of (C1027
Y YES
NO
Is there an output from pin 9 | 1C103 defective
of 1C103?
YES
Focus coil and connector
defective
NO
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