Battery Contacts. 19. Space is tight for terminal measurements. Terminals are spring loaded âpogo pins.â Battery. Page 20. Removing the Back to Show the main.
(official HP data sheet info.) Shorter, narrower, thinner Smaller by 46% in volume Heavier by 16% (big batt) Has fewer keys
3
Case
Large Case Still Fits
4
Case
High End Generations
5
Case
Is Primes Case The Thinnest? Case Dimensions 7.13 x 3.38 x 0.550 inches Weight 8.04 oz. USB Port (left) Three Flashing LEDs For Student Test Taking (right)
• 2 Rows of 6 keys (standard math functions) 17 • 1 Row of 4 keys + Double Wide ENTER • 4 Rows of 5 keys (number keys) Total keys
5 20 48
7
keyboard
Keys Have a Distinctive Click • A Thin keyboard has less travel. • Travel: 24 mils, snap click 4 mils from bottom. (LOG key) • Preproduction model
8
Keyboard
Prime’s Shifted Colors (What were they thinking?)
9
Gen5 Has a 3.5 inch Diagonal 320x240 Multi-touch Color Screen
Display
10
Peeping Prime TFT Touch Screen Pixels at 170x Observations The thin horizontal lines are probably pixel sense lines. Where are the vertical sense lines? The Red, Green, Blue pixels are more Red, Yellow, Blue. What is the significance of the lower left corner shape? 11
Display
Battery Charge Indicator
12
Display
Low Battery Indicator Voltages • Lithium-ion Battery voltages have small changes. • Low battery indicator seemed too unstable to be able to correlate to battery voltage. • See next section on the battery.
13
Display
Icons are 39 x 39 Pixels
14
Display
Prime Supports Dramatic Graphing
15
Display
Prime Supports Dramatic Graphing
16
Battery
Prime’s Battery is Cell Phone Large A USB 5v Charger is used. Heavy users may use a Galaxy 3 cell phone battery for increased capacity. Does the symbols mean that 3.7 VDC will run the calculator? 17
Battery
Battery Substitute Tests
A Battery substitute was made to apply 3.7 VDC to the calculator but the battery indicator dropped from 100% to 25%. The intent was to correlate battery voltage with battery indicator bars. Time didn’t permit additional tests. Is USB DC input required? 18
Battery
Battery Contacts
Space is tight for terminal measurements. Terminals are spring loaded “pogo pins.” 19
Internal
Removing the Back to Show the main circuit board. There many components with very small dimensions.
Display
Keyboard
20
Internal
The Case Snaps Together With Tabs and Slots
A sharp knife blade used with gentle care is required. Start at the top center and work around one side. 21
Internal
Main Board Closer View
22
Internal
IC Part Numbers • Small Square
•Long Narrow
Hnnix (symbol) H5MS2562NFA E3M 250A HTKM030761
Samsung 240 K9F2G08U0C SCBO CPI126GMN
• Large Square Samsung S3C2416XH-40 W1302 ARM N5FKDL
23
Internal
Large Connector Close Up
24
Internal
Battery Pogo Pin Connector
Center square push button switch is the Reset button. The four pins in the right foreground are the battery Pogo Pins that hold the battery in place. 25
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