lpq show the printer is NOT ready, how to fix this problem?

[Daniel Li]

I have configured printers.conf

# Printer configuration file for CUPS v1.3.9
# Written by cupsd on 2009-02-05 13:19
<DefaultPrinter printer>
Info HP
Location 192.168.58.145
DeviceURI socket://192.168.58.145:9102
State Idle
StateTime 1233811154
Accepting Yes
Shared Yes
JobSheets none none
QuotaPeriod 0
PageLimit 0
KLimit 0
OpPolicy default
ErrorPolicy stop-printer
</Printer>

/home/admin # ls /usr/etc/cups/ppd/
PDF.ppd         printer.ppd

/home/admin # ps |grep cupsd
  645 root       3180 S   cupsd
  663 root       3040 S   grep cupsd

But when I query the printer, it says not ready, why? how can I fix this problem.
/usr/etc/cups # lpq
printer is not ready
no entries
/usr/etc/cups # ping 192.168.58.145
PING 192.168.58.145 (192.168.58.145): 56 data bytes
64 bytes from 192.168.58.145: seq=0 ttl=60 time=10.6 ms
64 bytes from 192.168.58.145: seq=1 ttl=60 time=4.3 ms