TEK 2246 Time CAL error

Hi, I bought a TEK 2246 Mod A scope from ebay, when power up, the
following error appears:

SELF CAL TIME MEASUREMENTS
Search Returned Bad Value at 5 us

Diagnostic test failed with following msg:

TIME SIGNAL TOO SMALL
AT B TRIGGER

Sometime, a msg "WARNING PROBABLE BATTERY FAILURE, TURN OFF AND ON TO
VERIFY" displayed together with the SELF CAL TIME error when power up.

I have replaced the battery with a new Lithium CR123A, but still
received the battery warning message.

what is the possible caused of the error ? the condition of the scope
is very good, very much, I like to rectify the problem, any help is
much appreciated.

.

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