HP 4145A Operating And Service Manual page 50

Model 4145A
SECTION III
Table 3-4. Hardware-Related Error-Codes
Display Meaning
Error PO1 - PO4 One of the four ROMs (Read Only Memory) is not functioning properly.
I
Error PO5-P20
I
One of the sixteen RAMS (Ramdom Access Memory) is not functioning
properly.
Error P21 MPU's (Microprocessor Unit) peripheral circuit is not functioning properly.
I
Error MO8-Ml8
MSU (Mass Storage Unit : Flexible Disc and drive) is not functioning
properly. Try another disc.
Error A01
SMU controller is not functioning properly.
CHAN (! ! ! DOWN ! ! !)
CHAN (XX,XX,XX,XX)
SMU itself is not functioning properly. (XX indicates the SMU number
and error code. Refer to Fig. 3-20.)
Note
If a momentary power loss occurs, the 4145A's display may go blank. To recover, turn off
the instrument, wait a few seconds, and then turn on the instrument.
Note
The 4145A will function properly even though error M 13 or M 14 is displayed.
3-17