Thermo Scientific 20 GENESYS User manual

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GENESYS™ 20
SPECTROPHOTOMETER
SERVICE
MANUAL

GENESYS™ 20
SPECTROPHOTOMETER
SERVICE
MANUAL

Copyright © 1998-2002, Thermo Spectronic
All rights reserved.

i
NOTE
This service manual contains information, instructions, and specifications for the
GENESYS
20 spectrophotometer that were believed accurate at the time this
™
manual was written. However, as part of Thermo Spectronic’s on-going program of
product development, the specifications and operating instructions may be
changed from time to time. Thermo Spectronic reserves the right to change such
operating instructions and specifications. Under no circumstances shall Thermo
Spectronic be obligated to notify purchasers of any future changes in either this or
any other instructions or specifications relating to Thermo Spectronic products, nor
shall Thermo Spectronic be liable in any way for its failure to notify purchasers of
such changes.
FCC COMPLIANCE STATEMENT FOR U.S.A. USERS
This equipment generates, uses, and can radiate radio frequency energy, and if not
installed and used in accordance with the reference guide, may cause interference
to radio communications. It has been tested and found to comply with the limits in
effect at the time of manufacture for a Class A computing device pursuant to
Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable
protection against such interference when operated in a commercial environment.
Operation of this equipment in a residential area is likely to cause interference in
which case the user at his own expense will be required to take whatever
measures may be required to correct the interference.

ii
NEW PRODUCT WARRANTY
Thermo Spectronic instrumentation and related accessories are warranted against
defects in material and workmanship for a period of three (3) years from the date of
delivery.
This warranty covers all parts and labor, and applies only to equipment which has
been installed and operated in accordance with the operator's instruction manual
and which has been serviced only by authorized Thermo Spectronic dealers or
service personnel. This warranty does not apply to equipment and accessories that
have been modified or tampered with in any way, misused, or damaged by
accident, neglect, or conditions beyond Thermo Spectronic's control.
Thermo Spectronic is not responsible under this warranty for loss in operating
performance due to environmental conditions.
THIS WARRANTY IS IN LIEU OF ALL WARRANTIES EXPRESSED, IMPLIED,
OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, WARRANTIES OF
FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY OR
OTHERWISE, and states Thermo Spectronic’s entire and exclusive liability and the
Customer's exclusive remedy for any claim in connection with the sale or furnishing
of services, goods, or parts, their design, suitability for use, installation, or
operations. Thermo Spectronic will in no event be liable for any direct, indirect,
special, or consequential damages, whatsoever, including loss of goodwill, whether
grounded in tort (including negligence), strict liability or contract, and Thermo
Spectronic's liability under no circumstances will exceed the contract price for the
goods and/or services for which liability is claimed.
UPDATE POLICY
Thermo Spectronic may, from time to time, revise the performance of its products,
and in doing so incur no obligation to furnish any such revisions to any Thermo
Spectronic customer.

GENESYS 20
Service Manual
Table of Contents
iii
Section 1
-
Description
Section 2 - Specifications
Section 3 - Installation and Performance Checks
Section 4 - Troubleshooting
4.1
Error Messages
............................................................
4 - 1
4.2
General Troubleshooting Items
................................................
4 - 3
Section 5 - Routine Maintenance
5.1
Lamp Replacement
.........................................................
5 - 1
5.2
Replace Fuse
..............................................................
5 - 4
Section 6 - Optical Description
Section 7 - Optical Alignment
7.1
Filter and Lens Assembly Alignment
............................................
7 - 2
7.1.1
Alignment Tool
.....................................................
7 - 2
7.1.2
Alignment Check
....................................................
7 - 2
7.1.3
Alignment Procedure
.................................................
7 - 3
Section 8 - Electrical Circuit Description and Adjustment
8.1
Primary Wiring
............................................................
8 - 1
8.2
Universal Input AC/DC Switching Power Supply Board
............................
8 - 2
8.3
Main Board
...............................................................
8 - 3
8.3.1
Digital Circuitry
.....................................................
8 - 3
8.3.2
Analog Circuitry
....................................................
8 - 4
8.4
Mono Drive Board
..........................................................
8 - 8
8.5
Detector Board
.............................................................
8 - 9

iv
Section 9 - Disassembly and Replacement
9.1
External Covers
............................................................
9 - 2
9.1.1
Lamp Door Assembly
................................................
9 - 2
9.1.2
Printer Cover
.......................................................
9 - 3
9.1.3
Cover Assembly
....................................................
9 - 3
9.1.4
Sample Compartment Cover Assembly
...................................
9 - 6
9.1.5
Rear Panel
.........................................................
9 - 8
9.2
Front Panel Assemblies
......................................................
9 - 9
9.2.1
Display
...........................................................
9 - 9
9.2.2
Key Pad
...........................................................
9 - 9
9.3
Internal Assemblies
........................................................
9 - 11
9.3.1
Main Circuit Board
.................................................
9 - 11
9.3.2
Power Entry Module
................................................
9 - 13
9.3.3
Power Supply
.....................................................
9 - 15
9.3.4
Detector Assembly
.................................................
9 - 17
9.3.5
Entrance Slit/Illumination Assembly
....................................
9 - 17
9.3.5.1
Lamp Socket
...............................................
9 - 18
9.3.5.2
Spring
....................................................
9 - 19
9.3.6
Filter and Lens Assembly
............................................
9 - 20
9.3.6.1
Filter Wheel
...............................................
9 - 21
9.3.6.2
Filter Wheel Motor
..........................................
9 - 22
9.4
Limit Switch
.............................................................
9 - 24
Section 10 - Accessories
Section 11 - Spare Parts and Special Tools
Section 12 - Drawings and Schematics
Section 13 - Update Information

GENESYS 20
Service Manual
List of Illustrations
v
Section 1
-
Description
Figure
1.1
-
GENESYS 20 Components
...........................................
1 - 2
Figure
1.2
-
Keyboard Layout
...................................................
1 - 3
Section 2 - Specifications
Section 3 - Installation and Performance Checks
Section 4 - Troubleshooting
Section 5 - Routine Maintenance
Figure
5.1
-
Lamp Compartment
.................................................
5 - 2
Figure
5.2
-
Removing Fuse Cover
...............................................
5 - 4
Figure
5.3
-
Remove and Replace Fuses
...........................................
5 - 4
Section 6 - Optical Description
Figure
6.1
-
Optical Path
.......................................................
6 - 1
Section 7 - Optical Alignment
Figure
7.1
-
Fabricated Alignment Tool
...........................................
7 - 2
Section 8 - Electrical Circuit Description and Adjustment

Outline
vi
Section 9 - Disassembly and Replacement
Figure
9.1
-
Cover Assembly: Side View
..........................................
9 - 2
Figure
9.2
-
Cover Assembly: Top View
...........................................
9 - 3
Figure
9.3
-
Base Assembly: Bottom View
.........................................
9 - 4
Figure
9.4
-
Connections to Main Board
...........................................
9 - 5
Figure
9.5
-
Sample Compartment Cover Assembly
..................................
9 - 6
Figure
9.6
-
Sample Compartment Cover Hinge Mounting
.............................
9 - 7
Figure
9.7
-
Connections to Main Board
..........................................
9 - 11
Figure
9.8
-
Main Circuit Board
................................................
9 - 12
Figure
9.9
-
Interior Layout
....................................................
9 - 14
Figure
9.10
-
Entrance Slit/Illumination Assembly
...................................
9 - 19
Figure
9.11
-
Filter and Lens Assembly
...........................................
9 - 21
Figure
9.12
-
GENESYS 20: Bottom View
.........................................
9 - 24
Section 10 - Accessories
Section 11 - Spare Parts and Special Tools
Section 12 - Drawings and Schematics
Section 13 - Update Information

Section 1
Description
1 - 1
The GENESYS™ 20 spectrophotometer is a bench-mount instrument that
performs Absorbance, % Transmittance, and Concentration measurements within
the wavelength range of 325 to 1100 nanometers. Its features include:

Two-line, 20-character LCD display

Tactile keyboard that clicks to indicate a key was pressed

Optional cell holders available for a wide range of cuvettes, test tubes
and longpath cells

Optional internal printer

Built-in RS232 interface

Built-in Centronics Printer Port

Description
1 - 2
Figure 4-1
- GENESYS 20 Components
Figure 1.1 shows the main components of the instrument (indicated by the
numerical call outs). These are as follows:
1.
On/Off switch (on back)
2.
LCD display
3.
Sample compartment door
4.
Keyboard
5.
Optional built-in printer
6.
Lamp compartment door

Description
1 - 3
Figure 4-2
- Keyboard Layout
The main keyboard functions are shown in Figure 1.2 (indicated by the
numerical call-outs). These are as follows:
1.
Display - 20-character, 2-line LCD
2.
Soft key 1 - Function varies depending on screen; generally Escape,
Back Up, or Clear
3.
Soft key 2 - Function varies depending on screen; generally Enter,
Accept, or Continue
4.
Scroll keys - Used to scroll through menus and enter numeric values
5.
Wavelength controls - Increase and decrease the wavelength settings
6.
0 Abs/100%T - Automatically sets the instrument to zero absorbance
(100%T)
7.
A/T/C - Switches between absorbance, %transmittance, and
concentration modes

Description
1 - 4
8.
Utility - Accesses instrument set-up, diagnostics, and other functions
9.
Print - Sends currently displayed data to selected printer

Section 2
Specifications
2-1
Wavelength range 325 to 1100nm
Bandpass
# 8mm
Stability
# 3 mA/hour drift
Stray light
# 0.1%T, when measured at 340 and
400nm
Wavelength repeatability ±0.5nm
Wavelength accuracy ±2.0nm
Noise (@ 500nm)
# 1mAat0Aand4mAat2A,
peak-to-peak (15 seconds)
Photometric accuracy
0.0 to 0.3 A ± 0.003 A
0.301 to 2.5 A ± 1.0%
Photometric range 0-125%T, -0.1-2.5A, 0-1999C
Light source lifetime Visible: ~1000 hours
Grating 1200 lines/mm
Data output • Two-line, 20-character LCD display
• RS232C port
• Centronics port
Dimensions 12 in. W x 13 in. D x 7 in. H
[30cmWx33cmDx19cmH]
Power requirements Selected automatically; 100 to 240 Volts,
50 to 60 Hz
The GENESYS 20 spectrophotometer has been designed to operate under the
environmental and electrical requirements listed below.
Line voltages 100 - 240V ± 10%
50 - 60 Hz ± 10%
Operating environment
The instrument meets the previous specifications when operated under the
following conditions, after a 30-minute warm-up period.
Ambient temperature Relative humidity
50
E Fto75 E F(15 E Cto24 E C) 20% to 80%
76
E Fto85 E F(25 E Cto29 E C) 20% to 70%
86
E Fto95 E F(30 E Cto35 E C) 20% to 60%
96
E F to 105 E F(36 E Cto40 E C) 20% to 50%

Specifications
2-2
Storage environment -40
E F to 140 E F[-40 E Cto60 E C]
Relative humidity not to exceed 60%.
Allow instrument to adjust to room
temperature for 24 hours after taking it out
of storage.
Temperature should be maintained at
±4
E F[±2 E C].
Relative humidity should be maintained to
±5%.
Altitude From below sea level to 6562 feet
[2000 meters].
For indoor use only
Installation Category II
Pollution Degree 2

Section 3
Installation and Performance Checks
3 - 1
The following performance checklist can be copied, completed, and a copy left with the end-user. The checklist
should be used anytime an instrument is tested, or repaired.

Installation and Performance Checks
3 - 2
Thermo Spectronic
Field Inspection / Performance Checklist
GENESYS 20
Customer_______________________ Contact________________________
Phone #________________________ S/N____________________________
Cat #_____________ Man #_______ Date_______
SPECTRONIC Standards Kit, Certified Kit # ________________
I Initial inspection -
1 Appearance ....................... Good___ Fair___ Poor___
2 Line voltage ..................................... _____VAC
3 Ground Continuity ( < 1 ohm ) ........................_____ OK
4 RevisionLevel(Firmware) .......................... ________
5 CURRENT REVISION .............................. ________
II Subsystem and Voltage checks -
1 Power up sequence .......................... Pass___ Fail ___
2 Voltages: +5v ___ ± 0.1v +12v ____ ± 0.6v -12v ____ ± 0.6v
3 Lamp Voltage 5.7v to 6.1v ________ v
4 Light centered on entrance slit ........................_____ OK
5 Check Image at Detector ............................_____ OK
6 SPECTRONIC Wavelength std ( +/- 5.0nm ) ..........._____ OK
7 Photometric Accuracy ( 10% T & 50% T ) ....
a 10%Tfiltervalue ±2.0%T ........................ _____ OK
b 50%Tfiltervalue ±2.0%T .................... _____ OK
8SRE
a 340nm ( < 0.4% T ) .....
_____ OK
b 400nm ( < 0.4% T ) .......................... _____ OK
9 Keyboard Tests ................................... _____ OK
10 DisplayTests .................................... _____ OK
11 Beeper Volume ................................... _____ OK
III Comments -
______________________________________________________________
______________________________________________________________
______________________________________________________________
FSE signature _____________________________________ Date__/__/__

Section 4
Troubleshooting
4 - 1
This section is designed to guide the service technician through basic procedures
to be used in determining the cause of various machine errors. Diagnostic
techniques do not take the technician beyond board-level analysis. If an error
exists on a particular circuit board, replace the entire board.
4.1
Error Messages
A number of error messages are generated by the spectrophotometer to indicate
improper operations. These are displayed for the operator (and explained in the
GENESYS 20 Operator's Manual) and can normally be resolved without further
troubleshooting. They are included here for the convenience of the Service
Technician.
The instrument generates two types of errors. With the first type, a warning
signal is generated and the error message displays briefly, but the instrument is
still functional. With the second type of error, the error message remains and the
instrument is not functional until the condition is resolved.
Flashing Data Display Indicates the sample has an absorbance or
transmittance value below or above the photometric
range of the instrument. The display flashes until the
condition is resolved.
Lamp Failure Indicates the lamp has failed. The message remains
on the display until the lamp is replaced.
Sample too dark Indicates the instrument has been asked to zero a
sample with a high absorbance at a low energy point.
The instrument beeps three times to announce the
message, the message remains on the display for two
seconds, then the normal display returns.
Sample too bright Indicates the instrument has been asked to zero a
sample while the door of the sample compartment is
open. The instrument beeps three times to announce
the message, the message remains on the display for
two seconds, then the normal display returns.

Troubleshooting
4 - 2
Key not active Indicates a non-functional key was pressed. For
example, this message would appear if [A/T/C] is
pressed when viewing the Utility menu. The
instrument beeps three times to announce the
message, the message remains on the display for two
seconds, then the normal display returns.