90
1
2
4
1
2
4
C
D
F
A
B
E
XV-DV820, XV-DV620
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
Diagnosis Contents
Defectiveness Assumption
Points
1
An opening screen is not
displayed by a monitor
(LCD turns on. A mecha
does not work.)
Are resonators (X601 and X301) on the DVDM Assy oscillating ?
Crystal resonator
(27MHz, 20MHz)
Refer to contents of a FE error displayed by FL display.
(SRAM defectiveness, I2C communication line defectiveness, etc.)
FRONT END IC
(DVDM IC301)
• 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
BACK END IC
(DVDM IC601)
Is a signal output from IC603-pin 28 (CPU_OE) on the DVDM Assy
immediately after the power on ? [L
↔
H]
Flash ROM
(DVDM IC603)
2
An opening screen is not
displayed on the monitor
(LCD turns on. A mecha
works.)
Check the video signal path between BACK END IC (DVDM IC601) and
video-out terminal
(cf. block diagram)
The video circuit
after BACK END
Continues to next page.
7.1.3 TROUBLE SHOOTING
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