Leica M844 User manual

Leica M844
Leica M820
User manual
10 713 294 – Version I
Living up to Life

Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
Thank you for purchasing a Leica surgical microscope system.
In developing our systems, we have placed great emphasis
on simple, self-explanatory operation. Nevertheless, we suggest
studying this user manual in detail in order to utilize all the
benefits of your new surgical microscope.
For valuable information about Leica Microsystems products
and services and the address of your nearest Leica representative,
please visit our website,
www.leica-microsystems.com.
Thank you for choosing our products. We hope that you will
enjoy the quality and performance of your Leica Microsystems
surgical microscope.
Leica Microsystems (Schweiz) AG
Surgical Division
CH-9435 Heerbrugg

Chapter overview
1
Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
Introduction 3
Operating elements 8
Preparation before operation 21
Use 38
Safety notes 48
Care and maintenance 58
What to do if...? 62
Technical data 66
This manual covers the following systems:
Leica M844 F40
Leica M844 F19
Leica M844 C40
Leica M844 CT40
Leica M820 F40
Leica M820 F19
Leica M820 C40
Leica M820 CT40

Contents
2Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
Page
Introduction
Design and function 4
Operating elements
Stands/ceiling mounts 8
Control unit 12
Leica M844 and Leica M820 surgical microscopes 13
Leica M844 accessories 14
Leica M820 accessories 15
Beam splitter, rotatable, 50/50% 15
Leica M844 and Leica M820 accessories 16
Foot/handswitches and handles 17
Video and photo accessories for Leica M844 19
Video and photo accessories for Leica M820 20
Preparation for operation
Pre-operation checklist 21
Fitting optical accessories for Leica M844 22
Fitting optical accessories for Leica M820 23
Mounting beam splitter, rotatable 23
Adjusting optical accessories – general information 24
Adjusting optical accessories for Leica M844 25
Fitting documentation accessories 26
Selecting documentation accessories 27
Fitting the slit lamp 28
Adjusting the slit lamp 30
Wide-angle observation system 32
Stand settings (F40, C40, CT40) 33
Stand settings (F19) 34
Transport, transporting and rest positions 35
Positioning at the operating table 36
Sterile controls 37
Use
Positioning the microscope 38
Adjusting the microscope 39
Touch panel 40
Switching the microscope on 41
Selecting users 41
Editing the user list 42
Configuring users (User Settings menu) 42
StepCycle 45
Auto Reset 46
The Maintenance menu 46
The How to... menu 47
The Service menu 47
Safety notes
Intended use 48
Directions for the person responsible for the
instrument 48
User qualifications 48
Directions for the operator of the instrument 48
Dangers of use 49
Page
Manufacturer's declaration of
electromagnetic compatibility 51
Signs and labels 55
Care and maintenance
Maintenance instructions 58
Cleaning the touch panel 58
Maintenance 58
Changing fuses 59
Changing bulbs 59
Notes on reprocessing of sterilizable products 60
Instructions 60
Table: Sterilization 61
What to do if...?
General 62
Microscope 62
Control unit 64
Error messages on the control unit 64
F40 stand 64
C40 ceiling mount 64
CT40 ceiling mount 65
F19 stand 65
TV, photography 65
Technical data
Microscope 66
Lamps 66
Accessories 66
Electrical data 67
Auxiliary power socket 67
Optical data 67
Stands/ceiling mounts 68
Ambient conditions 69
Standards 69
Limitations of use 69
Dimensioning drawing (mm) Leica M844 F40 and
Leica M820 F40 70
Dimensioning drawing (mm) Leica M844 C40
and Leica M820 C40 71
Dimensioning drawing (mm) for Leica M844 CT40
and Leica M820 CT40 72
Dimensioning drawing (mm) for Leica M844 F19
and Leica M820 F19 73

3Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
Introduction
User manual
In addition to instructions for use, this user
manual also provides important safety notes
(see the chapter entitled, "Safety notes").
Read the user manual carefully and thoroughly
before placing the product in operation.
Product identification
The model code and serial number of your product are provided
on the nameplate found on the underside of the swing arm.
Write this data into your user manual and always refer to it
when you contact us or the service workshop regarding any
questions you may have.
Model: Serial No.:
Symbols in this user manual
The symbols used in this user manual have the following
meanings:
Warning Warning regarding use hazard or
noncompliant use that can lead to serious
injury or death.
Caution Warning regarding use hazard or
noncompliant use that can lead to minor
injury, but significant article, property or
environmental damage.
Useful information that can help the user
operate the product correctly and
efficiently.
Request for action; here, you are
requested to take action.
➩

Introduction
4Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
1 Control unit
2 Horizontal arm
3 Swing arm
4 XY unit
5 Binocular tube
6 0° assistant’s attachment (Leica M844 only)
7 Handle
8 Optics carrier
9 Tilt head
10 Column
11 Cable support
12 Base
13 Holding fixture for video control unit
14 Handle
15 Suspension device for footswitch
12
3
4
5
6
7
8
9
10
11
12
14
13
15
Design and function
Leica M844 F40 and Leica M820 F40

Introduction
5
Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
12
3
4
5
6
7
8
9
10
11
12
14
13
15
Leica M844 F19 and Leica M820 F19
1 Control unit
2 Horizontal arm
3 Swing arm
4 XY unit
5 Binocular tube
6 0° assistant’s attachment (Leica M844 only)
7 Handle
8 Optics carrier
9 Tilt head
10 Column
11 Cable support
12 Base
13 Holding fixture for video control unit
14 Handle
15 Suspension device for footswitch

6Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
Introduction
Leica M844 C40 and Leica M820 C40
1 Control unit
2 Horizontal arm
3 Swing arm
4 XY unit
5 Binocular tube
6 0° assistant’s attachment
7 Handle
8 Optics carrier
9 Tilt head
13 Holding fixture for video control unit
16 C40 ceiling mount
17 Wall mount for control unit (optional)
4
6
7
9
2
1
16
13
5
8
3
17

7Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
Introduction
Leica M844 CT40 and Leica M820 CT40
1 Control unit
2 Horizontal arm
3 Swing arm
4 XY unit
5 Binocular tube
6 0° assistant’s attachment (Leica M844 only)
7 Handle
8 Optics carrier
9 Tilt head
13 Holding fixture for video control unit
17 Wall mount for control unit (optional)
18 CT40 ceiling mount
4
6
7
9
2
1
18
13
5
8
3
17

8Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
Controls
Type 10448139
SN 211004003
Made in CH
h
Leica Microsystems (Schweiz) AG
CH-9435 Heerbrugg
LEICA M844 F40
100V -230V ~50/60Hz
400VA
2x T6.3A/250V
MODEL
25 Power supply
26 Fuse holder (2x 6.3 A, time-lag)
27 Running-time meter for the surgical microscope
28 Potential equalization socket
29 Socket for remote brake release
30 Auxiliary power outlet (max. output power 100 VA)
For requirements of use, see the Technical data, page 67.
31 Fuse holder (1 A, time-lag)
25
31
30
26 27 28 29
Caution 1
Connecting unauthorized secondary devices to the
auxiliary power socket can lead to damage to the
surgical microscope and to the secondary device!
➩Never connect secondary devices to the auxiliary
power socket unless they conform to the specifica-
tions. For requirements of use, see the Technical
data, page 67.
23
19
24
20
21
7
22
7 Handles
19 Power switch
20 Balancing knob
21 Swing arm stop lever
22 Footbrake release lever
23 Footbrake
24 Touch panel
Stands/ceiling mounts
F40 floor stand

Controls
9
Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
23
19
24
20
83
85
84
7
22
85
85
27 2328 30 31 26 25
25 Power supply
26 Fuse holder (2x 6.3 A, time-lag)
27 Hour meter for the surgical microscope
28 Potential equalization socket
30 Auxiliary power outlet (max. output power 100 VA)
For requirements of use, see the Technical data, page 67.
31 Fuse holder (1 A, time-lag)
Caution 1
Connecting unauthorized secondary devices to the
auxiliary power socket can lead to damage to the
surgical microscope and to the secondary device!
➩Never connect secondary devices to the auxiliary
power socket unless they conform to the specifica-
tions. For requirements of use, see the Technical
data, page 67.
F19 floor stand
7 Handles
19 Power switch
20 Balancing knob
22 Footbrake release lever
23 Footbrake
24 Touch panel
83 Retaining hook (blocks swing arm)
84 Retaining pin (holds retaining hook in released state)
85 Articulation brakes (regulate ease of movement)

19
24
25
20
21
7
10 Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
Controls
C40 ceiling mount
7 Handles
19 Power switch
20 Balancing knob
21 Swing arm stop lever
24 Touch panel
26 No function
27 Up
28 Down
26
Remote control
28
27
Type 10448139
SN 211004003
Made in CH
h
Leica Microsystems (Schweiz) AG
CH-9435 Heerbrugg
LEICA M844 C40
100V -230V ~50/60Hz
400VA
2x T6.3A/250V
MODEL
25 Power supply
26 Fuse holder (2x 6.3 A, time-lag)
27 Hour meter for the surgical microscope
28 Potential equalization socket
29 Socket for remote brake release
30 Auxiliary power outlet (max. output power 100 VA)
For requirements of use, see the Technical data, page 67.
31 Fuse holder (1 A, time-lag)
25
31
30
26 27 28 29
Caution 1
Connecting unauthorized secondary devices to the
auxiliary power socket can lead to damage to the
surgical microscope and to the secondary device!
➩Never connect secondary devices to the auxiliary
power socket unless they conform to the specifica-
tions. For requirements of use, see the Technical
data, page 67.

24
21
19
20
7
11Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
Controls
CT40 ceiling mount
7 Handles
19 Power switch
20 Balancing knob
21 Swing arm stop lever
24 Touch panel
27 Up
28 Down
28
27
Type 10448139
SN 211004003
Made in CH
h
Leica Microsystems (Schweiz) AG
CH-9435 Heerbrugg
LEICA M844 CT40
100V -230V ~50/60Hz
400VA
2x T6.3A/250V
MODEL
25 Power supply
26 Fuse holder (2x 6.3 A, time-lag)
27 Hour meter for the surgical microscope
28 Potential equalization socket
29 Socket for remote brake release
30 Auxiliary power outlet (max. output power 100 VA)
For requirements of use, see the Technical data, page 67.
31 Fuse holder (1 A, time-lag)
25
31
30
26 27 28 29
Caution 1
Connecting unauthorized secondary devices to the
auxiliary power socket can lead to damage to the
surgical microscope and to the secondary device!
➩Never connect secondary devices to the auxiliary
power socket unless they conform to the specifi-
cations. For requirements of use, see the Technical
data, page 67.
Remote control

12 Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
Controls
12
Control unit
Front view
Connections
SERVICE
LCD
USB
DVI
RESET
VIDEO
IN
IN/OUT IN/OUT
EXTERN
FOOT/HAND ADF
1 1 1 2 2 2
24 Touch panel
32 Brightness/contrast adjustment
Press once to adjust brightness
Press twice to adjust contrast
Press three times to save adjustment and exit
33 Decrease value
34 Increase value
35 Video mode active LED
36 Video mode/control unit (microscope) mode switch
37 Control unit mode active LED
38 Service interface
39 Reset button
40 USB connection
41 Video input
42 Internal CAN 1
43 Internal CAN 2
44 External CAN
45 Footswitch or handswitch 1
46 Footswitch or handswitch 2
47 ADF Additional Function 1
48 ADF Additional Function 2
38 Service interface
39 Reset button
40 USB connection
41 Video input (BNC)
42 Internal CAN 1
43 Internal CAN 2
44 External CAN
45 Footswitch or handswitch 1
46 Footswitch or handswitch 2
47 ADF Additional Function 1
48 ADF Additional Function 2
ADF 1 and 2 are digital relay outputs that can switch
24 V/2 A. During operation, use only the cables
provided for CAN, video and footswitch in order to
prevent malfunctions.
38 39 40
24 32 33 34 35 36 37
41 42 43 44 45 46 47
48

50
51
52
53
49 63 62
760
59
57
58
54
56
61
13Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
Controls
13
Leica M844 and Leica M820 surgical microscopes
7 Handles
49 Lamp cover opener
50 OCF – Optics Carrier Functions
51 CAN bus
52 Socket for external supply of slit lamp
53 OttoFlex/slit lamp switch
54 Rotary knob for focus fine adjustment (0° assistant’s
attachment for Leica M844 only)
56 Rotary knob for tilt drive (motorized)
57 Magnification display with XY reverse display
58 Focus reset
59 XY reset
60 Manual zoom emergency drive
61 Quick-change lamp mount
62 Slot for filter slide
63 OttoFlexTM II iris diaphragm

14 Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
Controls
14
Leica M844 accessories
A comprehensive range of accessories enables the Leica M844 surgical microscope to be matched to the requirements of the task
in hand. Your Leica representative will be pleased to help you select the appropriate accessories.
0° assistant’s attachment
Double wing
The Double Wing allows for a third observer in addition to the
surgeon and the assistant.
• the same image detail for each observer
• 50 % light distribution with the assistant, still 100 % light for
the surgeon
• 100 % stereopsis for all observers
• ±15° horizontal rotation of binocular tubes
The M84x Double Wing (10446740) is available as an
optional accessory.
64 65
66
67
68
69
64 Documentation port
65 Rotary ring for adjusting the diaphragm
Closing the diaphragm can affect the red reflex in
the video image.
66 Clamping screw for locking the binocular tube in place
Optionally, the clamping screw can be replaced
with the provided slotted screw.
67 Clamping screw for releasing the quick changer
68 Focus fine adjustment knob
69 Lever for turning the binocular tube by ±15°

Controls
15
Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
Leica M820 accessories
A comprehensive range of accessories enables the Leica M820 surgical microscope to be matched to the requirements of the task
in hand. Your Leica representative will be pleased to help you select the appropriate accessories.
Beam splitter
Attachment for second observer
Beam splitter, rotatable, 50/50%
• Allows viewing by a second person or documentation
• Light distribution: 50% to the side, 50% backwards
• The side exit allows a 180° rotation to the left and right
• Rotate always completely to the left or right side and tighten
with clamping screw (1)
1

16 Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
Controls
Leica M844 and Leica M820 accessories
65 55
75
65 55
75
Binocular tube 10° – 50°, low
• adjustable viewing angle and height
• adjustable interpupillary distance
Binocular tube, 180° variable
• tilts 180°
Binocular tube 5° – 25°
• adjustable viewing angle and height
• adjustable interpupillary distance
Binocular tube, low
• not tiltable
Binocular tube 30° – 150°
• tilts 120°
• adjustable interpupillary distance
Binocular tube 10° – 50° with PD
• adjustable viewing angle and height
• adjustable interpupillary distance
Binocular tube 10° – 50° UltraLowTM II
• with extra-low viewing height
• adjustable viewing angle and height
• adjustable interpupillary distance

17Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
Controls
Foot/handswitches and handles
12-function footswitch, cross
12-function footswitch, long
16-function footswitch, cross
Handswitch
Handles
Standard configuration "Cataract"
Here is an overview of all possible footswitches and
handswitches that you can use to control your Leica M820 and
Leica M844 surgical microscopes with the standard
configuration "Cataract".
Footswitches, handswitches and handles can be
individually assigned for each user in the configuration
menu (see page 43).

18 Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
Controls
12-function footswitch, cross
12-function footswitch, long
16-function footswitch, cross
Handswitch
Handles
Standard configuration "Retina"
Here is an overview of all possible footswitches and
handswitches that you can use to control your Leica M820 and
Leica M844 surgical microscopes with the standard
configuration "Retina".
Footswitches, handswitches and handles can be
individually assigned for each user in the configuration
menu (see page 43).