DVP-CX985V
4-11. TROUBLESHOOTING1-3. Clock signal check
4-11-1. Cannot Enter Test ModeMeasure the clock signal frequency at CPUCK (CL102) of
You cannot enter the Test mode when either button has been pressedSYSCON (IC104) with an oscilloscope.
by any reason with the board assembled in the front panel. In thisIf the 8.25 MHz signal appears. t Check the machine ac-
state, the power does not turn on even under normal condition (thecording to section 1-3-1
unit is kept in standby state), and also no button is active and theIf the 33 MHz signal appears. t Check the machine accord-
remote commander is not accepted. To check this state, you caning to section 1-3-2.
enter forcibly the IF CON self-diagnosis mode by turning on theIf other frequencies are output.
AC power with the SELF_CHECK (pin oj) of the IF CON (IC1003)R106 and R107 have defective soldering, X101 crystal os-
on the PANEL-L board kept Olow�. The IF CON (IC1003) checkscillator is defective.
the SELF CHECK port only after the power on reset (only at ACIf the measurement point is fixed to either OH� or OL�. t
supply, not in standby state).Observe XRESET (pin-uh) of SYSCON (IC104) with an
oscilloscope.
4-11-2. Faults in Test Mode (MB board)If the measurement point is OL�, check the following items.
1. The test mode menu is not displayed.If the IC has defective soldering, if the IC is short-circuited.
1-1. Board visual checkIf the measurement point is OH�,
Check that the ICs of SYSCON (IC104), ROM (IC106), AVDt Component X101 or SYSCON (IC104) is defective.
(IC403), ARP & SERVO (IC301) are working correctly.
Check that outside appearance of the ICs is normal.1-3-1. When the 8.25 MHz signal appears at CPUCK
Check that IC pins are not short-circuited.? Check the XRD, XWRH and CS0X signal.
Check that there is no soldering error.Observe XRD (pin-u;), XWRH (pin-ua), and XROMCS (pin-
Check that outside appearance of the capacitors and resistorstk) of SYSCON (IC104) with an oscilloscope.
is normal.If these pins are fixed to either OL� (0V) or OH� (3.3V), or if
these pins stay in the center voltage, check the followings.
1-2. Power supply voltage checkCheck if the signal line does not have the defective solder-
Check the power voltage of the power connector (CN101).ing.
Check the power voltage of SYSCON (IC104).Check if the signal line is short-circuited with other signal
Check the power voltage of ROM (IC106).lines.
Check the power voltage of AVD (IC403).If you cannot find any problem t SYSCON (IC104) is
Check the power voltage of ARP & SERVO (IC301).defective.
If the power voltage has any abnormality t? HA [0 to 21] signal and HD [0 to 15] signal check
Check that the power supply lines are not shorted.Observe HA [0 to 21] (pins-<z/x to <z/. , <zzz to <zz, , <zx/ , 1 to 5) of
Check that there is no soldering error.SYSCON (IC104) and HD [0 to 15] (pins-ig to <z// ) with an
If any abnormality cannot be found still toscilloscope.
Check that each IC is working normally.If these pins are fixed to either OL� (0V) or OH� (3.3V), or if
the HA pin stays in the center voltage, check the followings.
(HD stays in the center voltage when it is normal.)
t Check if the signal line does not have the defective
soldering, or is short-circuited with other signal line or
SYSCON (IC104) is defective.
? Reset signal check
Check if XRESET (pin-uh) of SYSCON (IC104) normal or
not.
The signal starts up at the same time as Vcc t Defective sol-
dering.
If the trouble does not apply to any of the above-described phe-
nomenon, SYSCON (IC104) or ROM (IC106) is defective.
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ACEC
