Samsung SCR3232 Troubleshooting
7
n Troubleshooting
+5V, +12V of CN700 is normally inputted after
connection of power cable?
X201, X301, X401 oscillate?
Check power short and power supply cable
connection state
After checking IC201 75pin, IC301 11pin,
IC401 88pin for power input, if normal, replace
X201, X301, X401.
IC308 2pin changes from 0V to 5V?
IC302 6pin changes from 0V to 5V?
IC308 3pin : 0V→5V check
Y
Y
N
N
N
N
N
Y
N
N
N
N
N
N
Disc insert
Replace IC308
Check R314, R330, R305 soldering
Check power input of corresponding
IC and replace it
N
Tray in/out? Refer to ‘Tray open/close’
Y
Y
Y
Laser diode on? Refer to ‘No laser diode on’
Y
Focus up/down? Refer to ‘No focus lock’
Y
Focus lock?
Y
Disc rotates? Refer to ‘No disc rotation’
Y
Pause state
v Pause state : LED off as disc rotation state and continue 1 track jump
Y
Spindle lock?
Y
Pick up moves in at power on after moving
out?
Refer to ‘No sled operation’
IC302 3pin changes
from 5V to 0V when
power supplied?
Y
Check and
replace IC302
power
Y
Y
N
Is 3.3V supplied at IC202 4PIN?
IC202 surround circuits
R515, R514 check.
Is 3.3V sanctioned at IC201
DSPVCC terminal?
0V→5V changes at checking IC302 6pin
waveform while opening IC301 64pin and
IC401 9pin in turn
13
Equipments required at repair
1. Oscilloscope(100MHz and more) 2. PROBE for Oscilloscope(10:1)
3. PC(486 and more)
Verify the circuit of power unit and the first status(Plug-in the power cable without I/F cable and verify.)
TE signal at 1 track jump
N
8
No tray open/close
FPC is normally inserted in CN502? Retest after inserting FPC in CN502 properly
Start
N
Check SW301 pattern and soldering
v FPC : Flexible Printed Circuit
Replace SW301
After FPC short check, no error, check SW soldering of deck
FPC of CN502 is normally inserted?
Retest after inserting FPC in CN502 normally
After FPC short check, no error, check SW soldering of deck
FPC of CN502 is normally inserted?
Retest after inserting FPC in CN502 normally
N
N
N
IC301 49pin is 0V at pressing SW301?
Y
IC301 35pin is 0V with tray in?
CN502 16pin
becomes 0V?
CN502 14pin
becomes 0V?
Check R528,R511,R512 soldering
N
N
N
N
IC301 36pin is 0V with tray open?
Check R528,R511,R512 soldering.
Replace IC501Replace IC501
Y
Y
Y
Y
IC501 11pin change from 2.1V to +2V at pressing SW301?
N
N N
N
N
IC501 12pin changes from 2.1V to 2.5V at pressing SW301?
IC501 13pin changes from +6V to +4V, and 14pin
from +6V to +8V, at pressing SW301?
IC501 13pin and 14pin chage each from
6V, 6V, to 8V, 4V at pressing SW301?
Output Voltage of IC501 13Pin is impressed into
SLED
Motor
(-) and IC501 14Pin(+)?
Check pattern and soldering
between CN501 and IC301
Replace loading Motor.
Y
Y Y
YY
Y
14
OPEN tary repair
CLOSE operation repair
9
No laser on
Refer to ‘No tray open/close’
IC101 10pin changes from 0V to +3.3V? Refer to ‘Check power source and initial state’
N
N
IC101 9pin changes from 4.2V to 3.8V?
Check IC101 power input and replace.
Y
Open and close tray(Disc insettion)
Y
CN501 3pin changes from 2V to 2.5V?
Check D101, L101, Q102, R102, C103 soldering
Y
CN501 2pin changes from 0V to 0.7V? Check Pick-up FPC connection state
N
N
N
Y
Replace pick-up
Y
15
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