HP 87114B, Руководство по обслуживанию

Страница: 100 / 174

T able 4-1. HP 8711B/12B/13B/14B Self-T ests (continued)
T est T est Name Applicable Error Messages and Notes
13 Non-volatile SRAM Errors:
SRAM battery test F AILED - Saved states lost.
SRAM battery test ERROR - Cannot access SRAM.
T ests integrity of battery-backed SRAM, detects loss of power to SRAM.
Writes/reads pattern to part of SRAM.
Remove CPU board and check battery BT1, replace if needed. Replace CPU board
or check U124 controller , U83 SRAM, and U125 voltage regulator .
14 Digital IF Control T est not implemented.
15 CPU Support Circuitry Errors:
68901 MFP chip test F AILED .
Stuck interrupt.
T ests 68901 Multi-Function P eripheral chip and interrupt circuitry .
Replace CPU board, or check U133.
16 Analog Bus Errors:
CPU +5V supply is out of range!
Vpp Flash Supply is out of range!
T ests analog bus ADC on CPU board.
Replace CPU , or check power supplies , U109 voltage regulator for Vpp .
17 Real Time Clock T ests ability to write/read to real time clock.
18 Front P anel Interface Errors:
Front panel keyboard F AILED .
Command write timeout.
Read input timeout.
Clear input buer failed.
Echo byte test failed.
T ests front panel control processor .
Replace CPU board or check U136, U138.
19 Floppy Disk Controller Error:
Floppy Disk controller F AILED .
Error number <num>
T ests controller chip , accesses registers , writes commands and veries response .
Replace CPU or check U140.
20 HP-IB Interface Error: HP-IB test F AILED .
Data bit error on these bits: (followed by list)
T ests HP-IB interface , writes to chip and veries response . T est not performed if
anything connected to HP-IB .
Replace CPU board or check U9, U10, U34.
21 RS-232 Interface Errors:
RS-232 interface test F AILED .
Bus error .
Cannot access .
Data bit error on these bits: (followed by list)
T ests RS-232 DU ART chip , accesses registers on chip , checks for clock input.
Replace CPU board or check clock U4, DU ART chip U5.
T roubleshooting and Block Diagrams 4-11