Trouble Shooting - Pioneer XV-DV303 Service Manual

1

7.1.3 TROUBLE SHOOTING

Confirm the error history at first. (Refer to the "7.1.2 DISPLAY OF THE MECHANISM ERROR HISTORY")
When a history was not displayed, refer to the following table.
No. Symptoms
An opening screen is not
displayed by a monitor
(LCD turns on. A mecha
does not work.)
1
An opening screen is not
displayed on the monitor
2
(LCD turns on. A mecha
works.)
1
2
Diagnosis Contents
Are resonators (X601 and X301) on the DVDM Assy oscillating ?
Refer to contents of a FE error displayed by FL display.
(SRAM defectiveness, I2C communication line defectiveness, etc.)
• Is a signal input into IC603-pin 26 (CE3) on the DVDM Assy
immediately after the power on ?
[L ↔ H] → Communication with flash ROM
• Are the signals input into IC604-pin 16 (SMIWE), pin 19 (SMICS0)
and pin 38 (SMICLK) on the DVDM Assy ?
[L ↔ H] → Communication with flash ROM
Is a signal output from IC603-pin 28 (CPU_OE) on the DVDM Assy
immediately after the power on ? [L ↔ H]
Check the video signal path between BACK END IC (DVDM IC601) and
video-out terminal
(cf. block diagram)
XV-DV303
2
3
Defectiveness Assumption
Points
Crystal resonator
(27MHz, 20MHz)
FRONT END IC
(DVDM IC301)
BACK END IC
(DVDM IC601)
Flash ROM
(DVDM IC603)
The video circuit
after BACK END
Continues to next page.
3
4
A
B
C
D
E
F
87
4