Trouble Shooting - Pioneer DV-2750-S Service Manual

1

7.1.7 TROUBLE SHOOTING

No. Symptoms
The power is not turned on. Check the voltage of EV+4V, –28V and FLDC on the POWER
1
A
B
2 An opening screen is not
displayed on the monitor
(The FL display lights. The
mechanism does not work.)
C
D
E
3
An opening screen is not
displayed on the monitor
(The FL display lights. The
mechanism does not work.)
F
58
1
2
Diagnosis Contents
SUPPLY Unit.
Are wires of output connector (POWER SUPPLY Unit) and CN401
(DVDM Assy) disconnected or damaged ?
Check that the following voltage is output :
IC403-pin 5 : 3.3V on the DVDM Assy
Check that the voltage at IC101-pin 22 (KEY0) on the FLKY Assy
becomes 0 V when the POWER key is pressed and 3.3 V when it is
released.
Check that the voltage at IC101-pin 17 (SEL IR) on the FLKY Assy is in
the range between 0 and 3.3 V while receiving signals from the remote
control unit when any key on it is pressed.
Is the level at both IC101-pin 12 (XRESET) and pin 11 (POWER ON)
on the FLKY Assy "H" ?
• Check the voltage of E+6.8V and SW+3.3V on the POWER SUPPLY
Unit.
• Check the voltage of P-CONT is about 3V on the POWER SUPPLY
Unit.
Check that the following voltage are output :
IC401-pin 5 : 5V, IC402-pin 5 : 2.5V on the DVDM Assy.
Is a resonator (X601 : 27MHz) on the DVDM Assy oscillating ?
• Is a signal input into IC603-pin26 (PCE#) on the DVDM Assy ?
(Is a signal "H" for 80 mS and then "L" after the power is turned
on ?)
→ Communication with flash ROM.
• Are the signals input into IC602-pin 16 (DWE#), pin 19 (DCS#)
and pin 38 (SDCLK) on the DVDM Assy ?
(Is a signal fluctuating ?)
→ Communication with SDRAM
Is a signal output from IC603-pin 28 (PRD#) on the DVDM Assy?
(Is a signal fluctuating for several hundred mS after the power is turned
on ?)
Is a signal input into IC101-pin 16 (ACK) on the FLKY Assy ?
(Is a signal fluctuating ?)
→ Communication with FL Control IC
Is a signal output from IC101-pin 10 (XREADY) on the FLKY Assy ?
(Is a signal fluctuating in the range of 0-3V ?)
Are the signals output from IC101-pin 9, pin 8 and pin 7 on the FLKY
Assy ?
(in the range of 0-3V)
Are the signals of IC60-pin 5(SDA) and pin 6(SCL) on the DVDM Assy
fluctuating for one or two seconds after the power is turned ?
Check the video signal path between DVD IC (DVDM Assy IC601) and
video-out terminal (see the block diagram)
DV-2750-S
2
3
Possible Defective Points
POWER SUPPLY Unit
Connector / cable
3.3V Regulator IC (IC403)
FLKY Assy
Tact SW
(when operation of only the
POWER key on the main unit is
not accepted)
FLKY Assy
Remote receiver section
(when operation of only the
POWER key on the remote
control unit is not accepted)
FLKY Assy
FL Control IC (IC101)
POWER SUPPLY Unit
DVDM Assy
5V Regulator IC (IC401)
2.5V Regulator IC (IC402)
DVDM Assy
Crystal resonator (X601)
DVDM Assy
DVD IC (IC601)
Flash ROM (IC603)
SDRAM (IC602)
DVDM Assy
Flash ROM (IC603)
DVDM Assy
DVD IC (IC601)
FLKY Assy
FL Control IC (IC101)
FLKY Assy
FL Control IC (IC101)
DVDM Assy
DVD IC (IC601) –
FLKY Assy
FL Control IC (IC101)
communication line
DVDM Assy
EEPROM (IC60)
DVDM Assy
Video circuit after DVD IC
(IC601)
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4
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