[stevebrot]

Powersupplies I know of:

Don't forget the HQRP AHK and its various clones spec'ed to work with all Pentax bodies having the Hirose fitting for DC in (8.3V DC/2A).

amazon.com : HQRP AC Adapter Compatible with Pentax K-AC132 38780 K-1, K-3, K-3II, K-5II, K-5IIs Digital SLR Camera Power Supply Cord + Euro Plug Adapter : Camera & Photo?tag=pentaxforums-20&


BTW...the 645D and 645Z also use the D AC-50/K AC132 AC adapter.


Steve

[photogem]

I'm not sure what point you are trying to make. If it helps, the service manual for the K10D specifies "AC Adapter D-AC10" in only one place (may be an error).....

I know, see snapshot,..... but it is an error!

As far as I remember was the D-AC10 originally for the *ist-D but is identical to the D-AC76.
It has the coaxial plug which fits into the K100D as well.

The error in the K10D Service manual possibly occured when they wrote the service manual for the K100D and just took it over forgetting about the
new Hirose-plug!

This Hirose-input-DC-Socket was introduced the first time with the K10D and remained there for the K20D, K7, K5, K3, KP and K1.

But my point is about this issue (which in pure Pentax times and which was a long time ago) but that Ricoh now in present is not able to proof-read
what they offer on their website-shop:

The K-AC128 Adapter for the K-S1!

The K-AC128 is the correct adapter for the K-S1/K-S2, K-30/50/500/70

BUT: The photo does not show the K-AC128 but the D-AC76 with the coaxial plug!

The K-S1 nor the others have any DC Input-socket (neither coaxial nor Hirose)!

To make things more complicated (which basically is leading to much uncertainty*):
The K-AC128 is also called D-AC128, K-AC109, D-AC109, K-AC168 and D-AC168.
It anyway is a kind of very odd/crooked solution, because the batterydoor has to stay open and can easely get destroyed.

@Steve:
I left the clones because I felt it is better here to stick to the original Pentax AC-Adapters.
The 645D and Z evaded my attention, I never had them.


Here a snapshot of the K10D Servicemanual with the error of the D-AC10:

[jon.partsch]

The error in the K10D Service manual possibly occured when they wrote the service manual for the K100D and just took it over forgetting about the
new Hirose-plug!

There is at least one other error in the K10D service manual that appears to be inherited from the K100D service manual - it is in the footnote of the table of current values I posted above. I have left the error in place and noted it with "[sic]"

It really does look like the K100D manual was written first, and the K10D, K110D, and K100D Super service manuals are based upon it.

Do you have a source for any more recent service manuals?

~ Jon

[photogem]

Do you have a source for any more recent service manuals?

I am afraid not really
but I found two useful service-manuals to download:
Samsung GX10
and
Pentax K-r

---

Last edited by photogem; 04-23-2021 at 11:58 PM. Reason: correction of link-adress K-r

[photogem]

I had to correct the K-r link, it lead to the standard operation manual but we want the service manual!

[Lowell Goudge]

My understanding from most manufacturers is that if the camera is to idle for a period of time, the battery should be removed. Additionally, Lithium Ion batteries should never be discharged to "0". They should have some small charge remaining. I am not sure as to the reasoning but almost every camera manual that I have read regarding battery life and maintenance strongly suggests batteries, particularly Lithium, not be completely drained.

Does anyone have an understanding as to why that would be the case?

Not sure if the same issue applies to Lithium Ion batteries as Nickel Cadmium, but it was not a question of discharging below a specific voltage, nominally about 1 volt per cell, but that with a load remaining applied, there was a risk of unequal state of charge at the lower voltages of smome cells in series having the voltage forced to reversed polarity. Reverse polarity was what spoiled damage the cells.

As there was very little useful capacity below 1 volt per cell that was the cut off limit

[angerdan]

If any one has access to these specifications for more recent cameras, please let me know!

Pentax K10D - selected battery consumption current specifications:

Function	battery 7.5v	Power supply 8.3v
3 Main SW/ON (Meter OFF)	300mA	320mA
4 Main SW/ON (Meter ON)	540mA	540mA
5 Charging Flash (Meter ON) *	2,100mA	2,200mA
6 Driving AF motor *	2,800mA	2,800mA
8 Releasing Shutter *	3,600mA	3,600mA
9 Recording the image after release	600mA	650mA
10 Bulb	1,400mA	1,400mA
11 Displaying menu (LCD)	600mA	600mA
12 Displaying menu (Video output)	500mA	500mA
13 Displaying playback image	600mA	600mA
14 Recording payback image in the card	620mA	620mA

*5,6 and 7 [sic] are peak value averages and others are normal average.

Pentax K100D - selected battery consumption current specifications:

Function	battery 5.5v	Power supply 6.5v
3 Main SW/ON (Meter OFF)	180mA	240mA
4 Main SW/ON (Meter ON)	370mA	420mA
5 Charging Flash (Meter ON) *	2,100mA	2,200mA
6 Driving AF motor *	2,200mA	2,300mA
7 Releasing Shutter *	3,000mA	3,200mA
8 Recording the image after release	350mA	350mA
9 Bulb	1,200mA	1,200mA
10 Displaying menu (LCD)	500mA	450mA
11 Displaying menu (Video output)	400mA	350mA
12 Displaying playback image	500mA	450mA
13 Recording payback image in the card	500mA	450mA

*5,6 and 7 are peak value averages

Interesting would be a comparision with cameras from other brands:
New Ricoh Charger - Page 2 - PentaxForums.com

Canon EOS 1Ds Mark II

Current	Function
800 mA	Release including shutter clamp
260 mA	Card writing with display active
260 mA	deleting pictures
230 mA	Card writing
220 mA	powering on
190 mA	Pressed shutter button
170 mA	Display active
053 mA	Standby
018 mA	powered off
018 mA	powered off with AC adapter attached
0.2 mA	powered off with battery inserted
0.2 mA	auomatically powered off with inserted battery

Source:
zoo-fotografie.de

[jon.partsch]

Interesting would be a comparision with cameras from other brands:
New Ricoh Charger - Page 2 - PentaxForums.com

This is interesting. At first blush it looks like the Canon's currents are lower, but if you think about it, the Pentax functions with high current draw indicate that they represent the maximum current for that function. The Canon info may be showing average current. Also, we don't know what "display" (OVF, top LCD, rear LCD) the Canon table may be referring to. It's interesting, but I think largely an "apples to oranges" comparison.

~ Jon

[Lowell Goudge]

Very interesting figures. The problem is what to conclude from looking at the data?

Does the three bars indicate mean?
- 3 bars = 100% ?
- 2 bar = 66% ?
- 1 bar = 33% ?

When I use Pentax DSLR, I'm fine with 3 bars and 2 bars, but I often don't know what to do when the indicator shows only 1 bar... last bar can mean 33% or 5%, it's impossible to tell. So actually I don't care if the battery indicator show 3 or 2 bars, 3 or 2 bars simply means "no concern". Now, when I pick up the camera and I see the last bar on battery indicator I have no way to know if there is still 33% of the charge or only 5%, so in case of doubt I replace the battery by a fully charged one, that also means I can seldom make use of the full battery capacity. The only way I can made use of full battery capacity without worry is when I attached the extra battery grip to the camera and set the camera to use body internal battery first, in that case the internal battery is fully used until the camera switches its power source from internal to battery grip.

This was an issue with the K10/20 and the old 2 terminal battery. Battery state would show 100% until almost dead, when battery state dropped to 50% you had about 10-20 shots left before dead. I believe the third terminal permits a current measurement via a small series resistor, during discharge, and during charge, so that the charger can better determine state of charge while charging and the camera gets a better view of overall discharge rate.