Samsung SC-148B, Руководство по обслуживанию

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20
No tray open/close
FPC is normally inserted in CN702? Retest after inserting FPC in CN702 properly
Start
N
Check SW702 pattern and soldering
❋
FPC : Flexible Printed Circuit
Replace SW702
After FPC short check, no error, check SW soldering of deck
FPC of CN702 is normally inserted?
Retest after inserting FPC in CN702 normally
After FPC short check, no error, check SW soldering of deck
FPC of CN702 is normally inserted?
Retest after inserting FPC in CN702 normally
N
N
N
IC301 44pin is 0V at pressing SW702?
Y
IC301 29pin is 0V with tray in?
CN702 4pin
becomes 0V?
CN702 2pin
becomes 0V?
N
N
N
N
IC301 28pin is 0V with tray open?
Check R502,R503,R509 soldering.
CheckIC301,33pin, 34pin soldering.
Check R502,R503, soldering.
CheckIC301,33pin, 34pin soldering.
Replace IC501 Replace IC501
Y
Y
Y
Y
IC501 11pin change from 1.75V to +0V at pressing SW702?
N
N N
N
N
IC301 33pin changes from 1.75V to 5V at pressing SW702?
IC501 13pin changes from +2.4V to +0.7V, and 15pin
from +2.4V to +3.9V, at pressing SW702?
IC501 14pin chages from 2.4V to 3.9V
and 15pin from 2.4V to 0.7V at pressing SW702?
Output Voltage of IC501 13Pin is impressed into
LOADING (-) and IC501 14Pin(+)?
Check pattern and soldering
between CN702 and IC501
Replace loading Motor.
Y
Y Y
Y Y
Y
OPEN tary repair
CLOSE operation repair