6-7. VERSION INFORMATION6-9. TROUBLE SHOOTING
6-9-1. Faults in Test Mode (MB-108 board)
### Version Infomation ###1. The test mode menu is not displayed.
1-1. Board visual check
IF con.Ver.x.xxx(xxxx)Check that the ICs of SYSCON (IC104), ROM (IC106 or
Groupxx
IC107), AVD (IC403), ARP & SERVO (IC301) are working
SYScon.Ver.x.xxx(xxxx)correctly.
ModelxxCheck that outside appearance of the ICs is normal.
Region0xCheck that IC pins are not short-circuited.
Check that there is no soldering error.
Servo DSP Ver: x.xxxCheck that outside appearance of the capacitors and resistors
AVD ucode Ver: xxxxxxxx
is normal.
OPT TYPE : x LASER
Exit : RETURN
1-2. Power supply voltage check
Check the power voltage of the power connector (CN102).
The ROM version, region code, OPT type, etc. are displayed ifCheck the power voltage of SYSCON (IC104).
[5] is selected in the Test Mode Menu.
The parenthesized hexadecimal number in the version number fieldCheck the power voltage of ROM (IC106 or IC107).
Check the power voltage of AVD (IC403).
indicates the checksum value of the ROM.Check the power voltage of ARP & SERVO (IC301).
Note : After down loading ROM data, sometimes it happens thatIf the power voltage has any abnormality t
Check that the power supply lines are not shorted.
checksum is not the same as that of ROM data which has
been down loaded. In such a case, go back to the menuCheck that there is no soldering error.
and select ?0. Syscon Diagnosis?, then select ?1. All? inIf any abnormality cannot be found still t
Check that each IC is working normally.
?2. Version?. If the result of this operation does not give
an agreement, it must be either Down Load error or ROM
1-3. Clock signal check
error.Measure the clock signal frequency at CPUCK (CL101) of
6-8. VIDEO LEVEL ADJUSTMENTSYSCON (IC104) with an oscilloscope.
If the 8.25 MHz signal appears. t Check the machine ac-
cording to section 1-3-1
On the Test Mode Menu screen, selecting [6] displays color bars
If the 33 MHz signal appears. t Check the machine accord-
for video level adjustment. During display of color bars, OSD dis-ing to section 1-3-2.
appears but the menu screen will be restored if pressing any key.If other frequencies are output.
R110 and R113 have defective soldering, X101 crystal os-
cillator is defective.
If the measurement point is fixed to either ?H? or ?L?. t
Observe XFRRST (pin-uh) of SYSCON (IC104) with an
oscilloscope.
If the measurement point is ?L?, check the following items.
If the IC has defective soldering, if the IC is short-circuited.
If the measurement point is ?H?,
t Component X101 or SYSCON (IC104) is defective.
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ACEC
SONY
