Pioneer DV-373-S, Service Manual

Page: 55 / 92

DV-373-S
55
5 6 7 8
5 6
7
8
C
D
F
A
B
E
7.1.7 TROUBLE SHOOTING
No. Symptoms Diagnosis Contents Possible Defective Points
1 The power is not turned on.
Check the voltage of EV+4V, –28V and FLDC on the POWER
SUPPLY Unit.
POWER SUPPLY Unit
Are wires of output connector (POWER SUPPLY Unit) and CN401
(DVDM Assy) disconnected or damaged ?
Connector / cable
Check that the following voltage is output :
IC403-pin 5 : 3.3V on the DVDM Assy
3.3V Regulator IC (IC403)
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.
FLKY Assy
Tact SW
(when operation of only the
POWER key on the main unit is
not accepted)
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.
FLKY Assy
Remote receiver section
(when operation of only the
POWER key on the remote
control unit is not accepted)
2 An opening screen is not
displayed on the monitor
(The FL display lights. The
mechanism does not work.)
Is the level at both IC101-pin 12 (XRESET) and pin 11 (POWER ON)
on the FLKY Assy "H" ? FLKY Assy
FL Control IC (IC101)
• 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.
POWER SUPPLY Unit
Check that the following voltage are output :
IC401-pin 5 : 5V, IC402-pin 5 : 2.5V on the DVDM Assy.
DVDM Assy
5V Regulator IC (IC401)
2.5V Regulator IC (IC402)
Is a resonator (X601 : 27MHz) on the DVDM Assy oscillating ?
DVDM Assy
Crystal resonator (X601)
• 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
DVDM Assy
DVD IC (IC601)
Flash ROM (IC603)
SDRAM (IC602)
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 ?)
DVDM Assy
Flash ROM (IC603)
Is a signal input into IC101-pin 16 (ACK) on the FLKY Assy ?
(Is a signal fluctuating ?)
→
Communication with FL Control IC
DVDM Assy
DVD IC (IC601)
FLKY Assy
FL Control IC (IC101)
Is a signal output from IC101-pin 10 (XREADY) on the FLKY Assy ?
(Is a signal fluctuating in the range of 0-3V ?) FLKY Assy
FL Control IC (IC101)
Are the signals output from IC101-pin 9, pin 8 and pin 7 on the FLKY
Assy ?
(in the range of 0-3V)
DVDM Assy
DVD IC (IC601) –
FLKY Assy
FL Control IC (IC101)
communication line
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 ?
DVDM Assy
EEPROM (IC60)
3
An opening screen is not
displayed on the monitor
(The FL display lights. The
mechanism does not work.)
Check the video signal path between DVD IC (DVDM Assy IC601) and
video-out terminal (see the block diagram)
DVDM Assy
Video circuit after DVD IC
(IC601)