Editing Psion Revo Plus Troubleshooting Guide

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[[File:Psion Revo and Ericsson MC218.jpg|thumb|420px|A Revo beside an Ericsson MC218. Diagnosing a Revo Plus is diagnosing a Revo — with one fault crossed off the list.]]

Fault-finding for the '''[[Psion Revo Plus]]''' (and the Diamond Mako).

'''The Revo Plus is a [[Psion Revo|Revo]] with 16 MB of RAM, a larger battery and the loose-battery problem fixed.'''<ref name="wprevo">[https://en.wikipedia.org/wiki/Psion_Revo "Psion Revo"], Wikipedia. Source for the Revo Plus differences, the fix for the loose-battery problem, the Diamond Mako rebadge, the NiMH-only requirement, the over-80 % charging caution, the recalibration charge and the 84 % charging-light behaviour.</ref>

'''The whole of [[Psion Revo Troubleshooting Guide]] applies here''' — the battery and charging table, the case microswitch, the screen and connectivity faults, the list of deliberate omissions and the backlight story. This page records what differs.

== One fault you can cross off ==

'''Original Revos suffer from batteries coming loose and unplugging''' inside the case, producing intermittent deaths, unexplained resets and a machine that will not charge. '''Psion fixed this on the Revo Plus.'''<ref name="wprevo" />

So on a Plus:

* '''An intermittent death or a refusal to charge points at the cells or the charging circuit''', not at a loose connector.
* '''You do not need to glue the battery connector''' as a preventive measure — that is a Revo recommendation.
* If the connector genuinely is loose on a Plus, something else has disturbed it — most likely a previous repair.

== Charging faults ==

'''Identical to the Revo, and the over-80 % rule applies to both models.'''<ref name="wprevo" />

{| class="wikitable styled-table" style="width:100%; text-align:left;"
! Symptom !! Assessment
|-
| '''Cells get hot; charge never terminates''' || '''Overcharging.''' Charge termination senses a thermal change around 80 %. '''Do not put either Revo model on charge when the battery is already above about 80 %.'''<ref name="wprevo" />
|-
| '''Red charging light goes out early''' || '''Normal.''' It turns off at around '''84 %'''.<ref name="wprevo" />
|-
| '''Battery meter obviously wrong''' || Not recalibrated. Hard reset, then charge uninterrupted 0–100 %, preferably switched off, ignoring the meter.<ref name="wprevo" />
|-
| '''Recalibration charge seems too short''' || '''Expected on a Plus.''' It has a '''larger battery''' than the Revo, so the six-hour figure quoted for stock Revo capacity is not long enough. Extend it proportionally.<ref name="wprevo" />
|-
| '''Replaced cells behave oddly''' || Wrong chemistry. '''NiMH only.'''<ref name="wprevo" />
|-
| '''Charges erratically after a cell replacement''' || Damaged or displaced thermistor. It must be intact and held against the cell body.<ref name="r3uk">David Savery, [https://www.r3uk.com/index.php/tech-tips/34-disassembly-guides/3-psion-revodiamond-mako-disassembly-and-battery-replacement "Psion Revo/Diamond Mako Disassembly & Battery Replacement"], R3UK, 2004. Source for the thermistor, the pack construction, the case microswitch and the disassembly cautions, covering the Revo, Revo Plus and Diamond Mako.</ref>
|}

== The case microswitch ==

'''Unchanged from the Revo.''' A microswitch on the rear switches the machine on and off as the case opens and closes, and it is '''easily broken by too much force when refitting the battery bay'''.<ref name="r3uk" />

A Plus that no longer wakes on opening has very likely lost this switch to a previous battery replacement.

== Diamond Mako ==

The '''Diamond Mako''' is a Revo Plus rebadged by SONICblue for the United States and Canada.<ref name="wprevo" /> Everything here applies to it, and the battery replacement procedure explicitly covers it.<ref name="r3uk" />

== Everything else ==

See '''[[Psion Revo Troubleshooting Guide]]''' for the full battery and charging table, the screen ribbon restraint, the connectivity faults, the deliberate omissions (no backlight, no card slot, smaller screen, non-replaceable cells) and the EL+/EL− backlight investigation.

For the shared EPOC diagnostics — reset levels, the '''Shift-Ctrl-P''' Battery Information screen and touchscreen calibration — see '''[[Psion Series 5mx Troubleshooting Guide]]'''.

== Related pages ==

* [[Psion Revo Plus]] · [[Psion Revo Plus General Maintenance]] · [[Psion Revo Battery Replacement]]
* [[Psion Revo Troubleshooting Guide]] — the shared diagnostics
* [[Psion Series 5mx Troubleshooting Guide]]
* '''[[Battery Refurbishment]]''' · [[Recommended Tools]]

== References ==

<references />

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