Editing DECpc 320P Troubleshooting Guide

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[[File:DECpc 320P.jpg|thumb|right|300px|DECpc 320P (DigitalIceAge, Wikimedia Commons, CC BY 4.0)]]
Fault-finding for the '''[[DECpc 320P]]''', using GRiD's user guide for the GRiD 1755, the same design; the 320P's rating label carries the number 1755.<ref name="grid" /><ref name="label" /> Battery faults are covered on [[DECpc 320P Battery Replacement]].

== Power and battery symptoms ==
{| class="wikitable styled-table" style="width:100%; text-align:left;"
|+ '''Symptom, cause and action'''
! Symptom !! Probable cause !! Action
|-
| BATT indicator red with a continuous tone || Battery too low for normal operation; the machine switches off in about 2 minutes || Save work, connect the adapter or a charged pack. Fn+F5 silences the tone<ref name="grid11" />
|-
| BATT indicator orange and blinking || Battery removed while on AC, or battery damaged || Refit or replace the pack<ref name="grid11" />
|-
| BATT indicator red only during disk activity || Normal under heavy load || No action if it goes out when the drive stops<ref name="grid11" />
|-
| Battery drains while the adapter is plugged into the computer but not the mains || Expected || Plug the adapter into the mains<ref name="grid10" />
|-
| Power indicator orange || Processor switched to 10 MHz || Press Fn+F3 to return to 20 MHz<ref name="grid36" />
|-
| Display dark but the machine is running || Display timeout, Standby, or Fn+F7 pressed || Press a key, or press Fn+F7<ref name="grid30" /><ref name="grid36" />
|-
| Display blank with an external monitor connected || Output switched to the external port || Press Fn+F2<ref name="grid36" />
|}

== Resume problems ==
* Some applications lock up when Resume is used. Press the RESET button on the left side of the computer with the tip of a pen; unsaved data is lost.<ref name="grid16" />
* Software that uses the 386's virtual 8086 mode conflicts with Resume. GRiD lists Windows 3.0 in its 386 mode and EMM386.SYS; Resume cannot be used with them.<ref name="grid131" />
* An expanded memory manager other than GRiD's TEMM1755.SYS or EMM386.SYS may not recognise the video ROM. Exclude the area from C600 to C800 in its configuration.<ref name="grid131" />
* If the machine has been off longer than the resume battery can hold, it starts normally and unsaved work is lost. The resume battery recharges only from a fitted, charged main pack.<ref name="grid16" />

== Diagnostics ==
GRiD supplied a diagnostics program, DIAG1755, on the 1755's utilities diskette. Started with <code>a:diag1755</code>, it offers to print its output, then presents a menu of tests: main board, base and extended RAM, keyboard, floppy disk drive, hard disk drive, video, printer port and serial ports. The serial port test includes internal and external loopback tests; the external test needs a loopback plug.<ref name="grid121" />

== Disk drives ==
For the 3.5-inch diskette drive see [[Floppy Drive Repair]]; for the 2.5-inch hard disk, [[Hard Drive Maintenance and Repair]]. Fn+F4 spins the hard disk down until it is next accessed.<ref name="grid36" />

== Related pages ==
* [[DECpc 320P]]
* [[DECpc 320P General Maintenance]]
* [[DECpc 320P Battery Replacement]]

== References ==
<references>
<ref name="grid">GRiD Systems Corporation, ''GRiD 1755 Users Guide'', 1991 ([[:File:GRiD 1755 User Guide.pdf]]). Catalogued on archive.org as covering the GRiD 1755, DECpc 320p and Tandy 3820HD.</ref>
<ref name="grid10">GRiD, ''GRiD 1755 Users Guide'', p. 10. Charging notes.</ref>
<ref name="grid11">GRiD, ''GRiD 1755 Users Guide'', pp. 11 to 12, "Low-Battery Indications".</ref>
<ref name="grid16">GRiD, ''GRiD 1755 Users Guide'', pp. 15 to 16, "Using Resume".</ref>
<ref name="grid30">GRiD, ''GRiD 1755 Users Guide'', pp. 30 to 34, Setup parameters and timeouts.</ref>
<ref name="grid36">GRiD, ''GRiD 1755 Users Guide'', pp. 36 to 37, "Special Key Combinations".</ref>
<ref name="grid121">GRiD, ''GRiD 1755 Users Guide'', pp. 121 to 130, Appendix B, "Diagnostics".</ref>
<ref name="grid131">GRiD, ''GRiD 1755 Users Guide'', pp. 131 to 132, Appendix C, "Configurations".</ref>
<ref name="label">Maynard Historical Society Archives, "DECpc 320p Notebook Portable Computer", item 2023.52, rating label photograph, [https://collection.maynardhistory.org/items/show/8843 collection.maynardhistory.org].</ref>
</references>

[[Category:Digital Equipment Corporation]]
[[Category:Troubleshooting Guides]]