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1. PCG-V505 Series Troubleshooting
PCG-V505 SERIES
NO POWER WITH
AC ADAPTER
NO
YES
15.1 ~ 15.7VDC AT
ADAPTER JACK?
REPLACE AC
ADAPTER
SAME VOLTAGE AT
ADAPTER INPUT ON
MOTHERBOARD?
*
RELEASE UL
PROTECT CIRCUIT.
PROBLEM FIXED?
YES
NO
DC INPUT JACK
DEFECTIVE
YES
NO
AC ADAPTER
SHOULD BE
REPLACED
REPLACE
MOTHERBOARD
*
UL CIRCUIT MAY NEED
TO BE RELEASED
*
THE UL PROTECT
CIRCUIT IS RELEASED BY
UNPLUGGING THE AC
ADAPTER, MAIN, AND
BACKUP BATTERIES AND
WATING 10 SECONDS
FIGURE 1-2 - NO POWER TROUBLESHOOTING FLOWCHART
motherboard. Even if a new AC adapter is used, the UL Protect circuit will remain latched. In order to release the
latch, the AC adapter, main battery, and backup battery must be removed to allow the CMOS to reset. Wait about
10 seconds before re-applying any power.
If the voltage range of the AC adapter is within specifications, an attempt should be made to release the UL
latch to see if the unit powers up. If the unit powers up, the latch may have been triggered by a line surge.
Communicating with the customer regarding any recent power line problems or electrical storms will determine
if the AC adapter should be replaced. If there is any doubt as to what caused the latch circuit to engage, replace
the AC adapter.
If the unit is unable to power up with a charged battery and the AC adapter voltage is within the ranges mentioned
above, the motherboard must be replaced. Figure 1-2 contains a simple flowchart to aid in isolating a no power
condition.
