Panasonic KX-FLB852CX Service Manual page 157

6.6.12. INITIALIZING ERROR
After the power is turned on, the ASIC (IC600) initializes and checks each IC.
The ROM (IC602), SDRAM (IC601), G/A (IC604) and MODEM (IC607) are checked.
If initialization fails for the ICs, the system will not boot up.
In this case, please find the cause as follows.
CROSS REFERENCE:
NG EXAMPLE (P.276)
POWER SUPPLY BOARD SECTION (P.193)
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KX-FLB852CX / KX-FLB852CXS