Read Sony CMT-X3CD (serv.man2) Service Manual online
CMT-X3CD
5
2. When You Plug Power Cord and Turn The Main Unit
ON, The Main Unit Won’t Have Sound
Procedure:
1. Check U6 on the MA board and its peripheral circuit.
2. Check voltage +3.3V from pin 33, pin 60, pin 63, pin 70, pin
1. Check U6 on the MA board and its peripheral circuit.
2. Check voltage +3.3V from pin 33, pin 60, pin 63, pin 70, pin
72, pin 78, pin 83 and pin 90 of U6 on the MA board.
If the voltage +3.3V is not normal, check +3.3V power circuit
of MA board.
of MA board.
3. Check voltage +1.2V from pin 11, pin 77 and pin 86 of U6 on
the MA board.
If the voltage +1.2V is not normal, check +1.2V power circuit
of MA board.
of MA board.
4. Check if oscillating frequency 27 MHz of Y1 crystal on the
MA board is normal.
If the oscillating frequency 27 MHz is not normal, check if Y1
on the MA board and its peripheral circuit is in failure.
on the MA board and its peripheral circuit is in failure.
5. Check if the status of U17 and U25 on the MA board works
well, the normal status of pin 27 of U25 on the MA board is
sine wave with frequency 11.0592 MHz. And pin 23 of U25 on
the MA board is high in normal status.
sine wave with frequency 11.0592 MHz. And pin 23 of U25 on
the MA board is high in normal status.
If pin 27 of U25 on the MA board wave is not normal, check if
U17 and U25 on the MA board and its peripheral circuit is in
failure.
U17 and U25 on the MA board and its peripheral circuit is in
failure.
3. When You Plug Power Cord and Turn The Main Unit
ON, The Main Unit Won’t Read Disc Normal
Procedure:
1. Check U6 on the MA board signal and its peripheral circuit,
1. Check U6 on the MA board signal and its peripheral circuit,
and check +3.3V from pin 8 of U5 on the MA board is normal.
If +3.3V is not normal, check +3.3V power circuit of MA
board.
board.
2. Check every signal connected between U5 and U6 on the MA
board, especially including DATA, CLK and CS signal.
If DATA, CLK and CS signal is not normal output, check if U6
on the MA board is in failure.
on the MA board is in failure.
3. Check if +5V from pin 8, pin 19 and pin 21 of U7 on the MA
board is normal.
If +5V is not normal, check +5V power circuit of MA board.
4. Check every signal connected between U6 and U7 on the MA
board, especially FOCUS_S, SPDL_S, XOPVIN1, SLED_S,
TRACK_S, VREF2 and DRVSB signal to drive MD.
TRACK_S, VREF2 and DRVSB signal to drive MD.
If FOCUS_S, SPDL_S, XOPVIN1, SLED_S, TRACK_S,
VREF2 and DRVSB signal is not normal output, check if U7
on the MA board is in failure.
VREF2 and DRVSB signal is not normal output, check if U7
on the MA board is in failure.
4. When You Plug Power Cord and Turn The Main Unit
ON, The Wireless Set Can’t Connect The Bluetooth of
the Main Unit.
the Main Unit.
Procedure:
1. Check +3.3V from pin 29 and pin 32 of U13 on the MA board.
1. Check +3.3V from pin 29 and pin 32 of U13 on the MA board.
If +3.3V is not normal, check +3.3V power circuit of MA
board.
board.
2. Check U13 on the MA board signal and its peripheral circuit,
make sure U13 is in failure or not.
3. Touch the NFC, you can’t awake the Main Unit, but you can
connect the Bluetooth directly, check the connection between
the NFC module and the MA board.
the NFC module and the MA board.
If the connection is normal, check the NFC module.
– Continued on next page –
ABOUT PARTS REPAIR OF EACH BOARDS
When each boards installed in this unit are defective, individual
electrical parts that the mount is done cannot be replaced. When
each boards are defective, replace the mounted board or the whole
parts including an applicable board.
Printed wiring board and schematic diagram that have been de-
scribed on this service manual are for reference.
When each boards installed in this unit are defective, individual
electrical parts that the mount is done cannot be replaced. When
each boards are defective, replace the mounted board or the whole
parts including an applicable board.
Printed wiring board and schematic diagram that have been de-
scribed on this service manual are for reference.
NOTE THE REPLACING OF MA BOARD OR NFC
MODULE
When replacing the MA board or the NFC module, be sure replace
both at the same time.
The MA board or the NFC module cannot replace with single.
MODULE
When replacing the MA board or the NFC module, be sure replace
both at the same time.
The MA board or the NFC module cannot replace with single.
TEST DISCS
Use following TEST DISC (for CD) when this unit confi rms the
operation and checks it.
Use following TEST DISC (for CD) when this unit confi rms the
operation and checks it.
Part No.
Description
3-702-101-01 DISC
(YEDS-18),
TEST
4-225-203-01 DISC
(PATD-012),
TEST
J-2501-307-A DISC
(HLX-A1),
TEST
RELEASING THE DISC SLOT LOCK
The disc slot lock function for the antitheft of sample disc in the
shop is equipped.
The disc slot lock function for the antitheft of sample disc in the
shop is equipped.
Releasing Procedure:
1. Press the [
1. Press the [
@
/1
] button to turn the power on.
2. Press two buttons of the [ PAIRING FUNCTION] and [VOL
−] simultaneously for fi ve seconds.
3. The message “UNLOCKED” is displayed on the fl uorescent
indicator tube and the disc slot is unlocked.
Note: When “LOCKED” is displayed, the disc slot lock is not released by
turning power on/off with the [@/1] button.
COMPONENT REPAIR GUIDE
1. No Display When You Turn The Main Unit ON, When
you plug power cord and turn the main unit on, VFD
won’t display.
won’t display.
Procedure:
1. Check PW board +13V DC output.
2. Check MA board output
1. Check PW board +13V DC output.
2. Check MA board output
−24V from U18 on the MA board.
If
−24V is not normal, check the working status of U18 on the
MA board.
3. Check +3.3V from U3 on the MA board.
If +3.3V is not normal, check the working status of U3 on the
MA board.
MA board.
4. Check the waveform of Y1 on the MA board, the waveform of
Y1 on the MA board sine wave.
If the waveform of Y1 on the MA board is not normal, check
Y1 on the MA board.
Y1 on the MA board.
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