Anritsu MT9812B User manual

Third Edition
Read this manual before using the equipment.
Keep this manual with the equipment.
This manual explains important service items
related to service. Read both the operation
manual and this manual, and keep both with
the equipment.
MT9812B
Multi Channel Box
Service Manual
Measurement Solutions
ANRITSU CORPORATION
Document No.: M-W1555BE-3.0

ii
To prevent the risk of personal injury or loss related to equipment malfunction, Anritsu Corporation uses the following
safety symbols to indicate safety-related information. Insure that you clearly understand the meanings of the
symbols BEFORE using the equipment.
Some or all of the symbols may not be used on this equipment. In addition, when drawings are included in this
manual, labels on the equipment may not be shown on them.
Safety Symbols Used in Manual
DANGER
WARNING
CAUTION
Safety Symbols Used on Equipment and/or in Manual
The following safety symbols are used inside or on the equipment near operation locations, and/or in manual to
provide information about safety items and operation precautions. Insure that you clearly understand the
meanings of the symbols and take the necessary precautions BEFORE using the equipment.
This indicates a prohibited operation. The prohibited operation is indicated
symbolically in or near the barred circle.
This indicates an obligatory safety precaution. The obligatory operation is
indicated symbolically in or near the circle.
This indicates warning or caution. The contents are indicated symbolically
in or near the triangle.
This indicates a note. The contents are described in the box.
These indicate that the marked part should be recycled.
MT9812B
Multi Channel Box
Service Manual
15 February 1999 (First Edition)
25 April 2002 (Third Edition)
Copyright © 1999-2002, ANRITSU CORPORATION.
All rights reserved. No part of this manual may be reproduced without the prior written permission of
the publisher.
The contents of this manual may be changed without prior notice.
Printed in Japan
This indicates a very dangerous procedure that could result in death or serious
injury if not performed properly.
This indicates a hazardous procedure that could result in death or serious injury
if not performed properly.
This indicates a hazardous procedure or danger that could result in light-to-severe
injury, or loss related to equipment malfunction, if proper precautions are not taken.
Safety Symbols

iii
For Safety
For safety, do not open the equipment covers.
If repair is required, contact the sales representative, branch office, or agent at the
telephone number and address given in this document or in the equipment opera-
tion manual.
Although not recommended by Anritsu Corporation, if it is really imperative to
open the covers for emergency repair, take great care not to touch any dangerous
parts. Always request repair by a trained engineer who understands the hazards.
Anritsu Corporation will not accept liability for any injuries sustained as a result of
opening the equipment covers.
Part Names & Part Numbers
Please specify the part numbers shown in the parts list when making
inquiries or when ordering parts. There may be a difference between
the names of parts used in this manual and the parts actually used in
the equipment or supplied for repair. This is because equivalent
parts with the same functions, performance and reliability as the
parts specified in the circuit diagrams and parts list have been used
or supplied. Since the parts are equivalent, they have absolutely no
adverse effect on the equipment specified functions, performance or
reliability.

iv
For Safety
WARNING
1. ALWAYS refer to the operation manual when working near loca-
tions at which the alert mark shown on the left is attached. If the
operation, etc., is performed without heeding the advice in the
operation manual, there is a risk of personal injury. In addition,
the equipment performance may be reduced.
Moreover, this alert mark is sometimes used with other marks and
descriptions indicating other dangers.
2. Laser radiation warning
• NEVER look directly into the cable connector on the equip-
ment nor into the end of a cable connected to the equipment.
If laser radiation enters the eye, there is a risk of injury.
• Laser Radiation Markings on a following page show the Laser
Safety label attached to the equipment near the cable connec-
tor.
3. When supplying power to this equipment, connect the accessory
3-pin power cord to a 3-pin grounded power outlet. If a grounded
3-pin outlet is not available, before supplying power to the equip-
ment, use a conversion adapter and ground the green wire, or
connect the frame ground on the rear panel of the equipment to
ground. If power is supplied without grounding the equipment,
there is a risk of receiving a severe or fatal electric shock.
4. This equipment cannot be repaired by the user. DO NOT attempt
to open the cabinet or to disassemble internal parts. Only Anritsu-
trained service personnel or staff from your sales representative
with a knowledge of electrical fire and shock hazards should ser-
vice this equipment. There are high-voltage parts in this equip-
ment presenting a risk of severe injury or fatal electric shock to
untrained personnel. In addition, there is a risk of damage to pre-
cision parts.
5. This equipment should be used in the correct position. If the cabi-
net is turned on its side, etc., it will be unstable and may be dam-
aged if it falls over as a result of receiving a slight mechanical
shock.
or
Repair
WARNING
Falling Over

v
For Safety
CAUTION
1. Before changing the fuses, ALWAYS remove the power cord from
the poweroutlet and replace the blown fuses. ALWAYS use new
fuses of the type and rating specified on the fuse marking on the
rear panel of the cabinet.
T___A indicates a time-lag fuse.
___A or F___ A indicate a normal fusing type fuse.
There is risk of receiving a fatal electric shock if the fuses are
replaced with the power cord connected.
2. Keep the power supply and cooling fan free of dust.
•Clean the power inlet regularly. If dust accumulates around
the power pins, there is a risk of fire.
•Keep the cooling fan clean so that the ventilation holes are not
obstructed. If the ventilation is obstructed, the cabinet may
overheat and catch fire.
Changing Fuse
CAUTION
Cleaning

vi
WARNING
This equipment uses parts radiating Class 3 laser radiation. The
warning labels shown on the next page are attached near the laser-
radiation locations.
The product name and the danger classification specified by JIS,
IEC60825 and 21CFR1040.10 are explained below.
Type JIS, IEC60825 21 CFR 1040
MU952501A Class 3A Class III b
MU952502A Class 3A Class III b
MU952503A Class 3A Class III b
MU952504A Class 3A Class III b
MU952505A Class 3A Class III b
MU952601A Class 3A Class III b
MU952602A Class 3A Class III b
MU952603A Class 3A Class III b
MU952604A Class 3A Class III b
MU952605A Class 3A Class III b
MU952606A Class 3A Class III b
MU951301A Class 3A Class III b
MU951501A Class 3A Class III b
MU951001A Class 3A Class III b
MU951302A Class 3A Class III b
MU951502A Class 3A Class III b
MU951002A Class 3A Class III b
MU954501A Class 1 Class I
Class 1, Class 2 and Class 3 indicates the degree of danger of the
laser radiation outlined below as defined by JIS, IEC60825 and
21CFR1040.10.
Laser Radiation Markings
For Safety

vii
For Safety
WARNING
Class 1 Safe laser presenting no danger when used according to
design specifications.
Class 2 Laser radiating in 400 to 700 nm wavelength range. In
principal, this class of laser is not safe, but the danger to
the eyes is eliminated by the eye avoidance reaction in-
cluding the blink response.
Class 3A Laser radiating in 400 to 700 nm wavelength range. The
danger to the eyes is eliminated by the eye avoidance
reaction including the blink response. For lasers radiat-
ing at other wavelengths, the degree of danger to the na-
ked eyes is not greater than Class 1.
Class 3B The eyes will be damaged if direct laser radiation enters
the eyes. Normally there is no danger if the diffused
beam is observed.

viii
For Safety
Laser Radiation Markings
<IEC>
<21 CFR 1040>
<IEC>
DANGER
INVISIBLE LASER RADIATION
CLASS 3A LASER PRODUCT
DO NOT STARE INTO BEAM OR VIEW
DIRECTLY WITH OPTICAL INSTRUMENTS
INVISIBLE LASER RADIATION
AVOID DIRECT EXPOSURE
TO BEAM
MAXIMUM
WAVELENGTH
CLASS IIIb LASER PRODUCT
(MAX) (PULSE DURATION) (WAVELENGTH)
AVOID EXPOSURE
INVISIBLE LASER RADIATION
EMITTED FROM THIS APERTURE
<21 CFR 1040>
INDENTIFICATION LABEL
ANRITSU CORP.
10-27 MINAMIAZABU 5-CHOME
MINATO-KU, TOKYO, 106, JAPAN
MANUFACTURED AT:ANRITSU CORP.
ATSUGI PLANT. 19
CERTIFICATION LABEL
THIS PRODUCT CONFORMS TO
ALL APPLICABLE STANDARDS
UNDER 21 CFR 1040.10
<21 CFR 1040>

ix
For Safety
CAUTION
This equipment uses a lithium battery to back-up the memory. This
battery must be replaced by a service engineer when it has reached
the end of its useful life; contact the Anritsu sales section or your near-
est representative.
Note: The battery used in this equipment has a maximum useful life of
7 years. If should be changed before this period has elapsed.
Changing memory
back-up battery

x
Notes On Export Management
This product and its manuals may require an Export Li-
cense/Approval by the Government of the product’s country
of origin for re-export from your country.
Before re-exporting the product or manuals, please contact
us to confirm whether they are export-controlled items or
not.
When you dispose of export-controlled items, the products/
manuals are needed to be broken/shredded so as not to be
unlawfully used for military purpose.

xi
Equipment Certificate
Anritsu Corporation certifies that this equipment was tested before shipment us-
ing calibrated measuring instruments with direct traceability to public testing or-
ganizations recognized by national research laboratories including the
Electrotechnical Laboratory, the National Research Laboratory of Metrology and
the Communications Research Laboratory, and was found to meet the published
specifications.
Anritsu Warranty
Anritsu Corporation will repair this equipment free-of-charge if a malfunction
occurs within 1 year after shipment due to a manufacturing fault, provided that
this warranty is rendered void under any or all of the following conditions.
• The fault is outside the scope of the warranty conditions described in the op-
eration manual.
• The fault is due to mishandling, misuse, or unauthorized modification or repair
of the equipment by the customer.
• The fault is due to severe usage clearly exceeding normal usage.
• The fault is due to improper or insufficient maintenance by the customer.
• The fault is due to natural disaster including fire, flooding, earthquake, etc.
• The fault is due to use of non-specified peripheral equipment, peripheral parts,
consumables, etc.
• The fault is due to use of a non-specified power supply or in a non-specified
installation location.
In addition, this warranty is valid only for the original equipment purchaser. It is
not transferable if the equipment is resold.
Anritsu Corporation will not accept liability for equipment faults due to unfore-
seen and unusual circumstances, nor for faults due to mishandling by the cus-
tomer.
Anritsu Corporation Contact
If this equipment develops a fault, contact Anritsu Corporation or its representa-
tives at the address in this manual.

xii

I
1
2
3
Table of Contents
For Safety ....................................................... iii
Section 1 General ......................................... 1-1
1.1 Introduction ................................................................ 1-2
1.2 Safety Precautions..................................................... 1-2
Section 2 Mechanical Configuration........... 2-1
2.1 Introduction ................................................................ 2-2
2.2 Precautions................................................................ 2-2
2.3 Mechanical Parts List................................................. 2-2
2.4 Cabinet Disassembly ................................................. 2-4
Section 3 Troubleshooting .......................... 3-1
3.1 Introduction ................................................................ 3-2
3.2 Recommended Test Equipment ................................ 3-2
3.3 Block Diagram ........................................................... 3-2
3.4 Overall Troubleshooting............................................. 3-5
3.5 Troubleshooting for Main Frame................................ 3-10

II.

1-1
Section 1 General
1.1 Introduction .................................................... 1-2
1.2 Safety Precautions ........................................ 1-2 1
General

Section 1 General
1-2
1.1 Introduction
This service manual describes the repair of the MT9812B Multi Channel Box
(MCB) and plug-in units.
Section 2 describes how to disassemble and reassemble MCB, and the internal
configuration.
Section 3 describes how to troubleshoot and repair when a problem occurs during
measurements or when abnormalities are detected during performance checks.
Refer to the separate Operation Manual for details on operating procedures.
1.2 Safety Precautions
WARNING
1. Never look directly into the laser radiation emitted
from the OPTICAL OUTPUT connector or the far-
end of the connected fiber.
2. Do not disassemble the plug-in unit.
If you find problems with the plug-in unit, ex-
change it for the new plug-in unit.
The output energy for the Light Source units conform to IEC 60825-1 Class 3A
specifications and 21CFR1040.10 (FDA) Class III b specifications.
These products have the following items for the laser safety:
(1) Remote Interlock Connector,
(2) key control, and
(3) protective cover of the OPTICAL OUTPUT connector.
CAUTION
Don’t attach or remove the plug-in unit while POWER is
ON.
.

2-1
Section 2 Mechanical Configuration
2.1 Introduction .................................................... 2-2
2.2 Precautions.................................................... 2-2
2.3 Mechanical Parts List .................................... 2-2
2.4 Cabinet Disassembly ..................................... 2-4 2
Mechanical Configuration

Section 2 Mechanical Configuration
2-2
2.1 Introduction
This section describes the mechanical structure, the position of the internal units,
and the procedure for removing these units to disassemble and reassemble the
MT9812B.
CAUTION
Do not disassemble the plug-in unit.
If the unit is broken, exchange it for new unit.
2.2 Precautions
CAUTION
Failure to follow this safety procedure may cause fire
and electrical shock hazards that could result in per-
sonal injury.
Always follow the procedure steps below before disassembly and reassembly.
1
2
3
Step
Turn OFF the MT9812B power switch.
Unplug the plug for the AC outlet.
Remove the plug-in units from the MT9812B mainframe.
Procedure
2.3 Mechanical Parts List
Mechanical Parts List for Fig. 2-1 (Outer Cabinet)
Parts No. Description QTY.
1 32E11761 Front Frame (1MW3U) 1
2 32B11787 Side Channel (3U450D) 2
3 32E11801 Front Foot 1
4 32E11801B Front Foot 1
5 32E11802 Front Foot Holder 1
6 32E11802B Front Foot Holder 1
7 32E11803 Rear Foot 1
8 32E11803B Rear Foot 1
9 32E11804 Rear Foot Holder 1
10 32E11804B Rear Foot Holder 1
11 W3B11616 Side Cover (3U450D) 1
12 W3B11616B Side Cover (3U450D) 1
13 33B32676 Top Cover (1MW450D) 1
14 W3B12086 Bottom Cover (1MW450D) 1

2-3
2.3 Mechanical Parts List
Mechanical Parts List for Fig. 2-2 (Inter Cabinet)
Parts No. Description QTY.
15 W33B11842 Front Panel 1
16 W22B3158 Bottom Chassis 1
17 W33B11770 Top Chassis 1
18 W32B11604 Bracket for Fan 1
19 W32B11604B Bracket for Fan 1
20 W32B11605 Plate for Power Unit 1
21 W42B31935 Bracket for Switch 1
22 W4B32981 Plate (1) 1
23 W4B32982 Plate (2) 1
24 W2B3212 Front Panel Sheet 1
25 W23B3203 Rear Panel 1
26 W4H32983 Support (M3-L27.3) 6
27 W4Z31893 Slip Tape 18
28 W4Z32341 Slip Tape 4
29 W4Z32341B Slip Tape 2
30 44Z104385 Shield Fingers 9
31 W4E32015 Guide Rail (1) 20
32 W4E32016 Guide Rail (2) 10
33 W4H31936 Fan Nut 8
34 NO.1278 109-139 2
35 NO.1278 109-099C 1
36 W4B32454 Display Panel 1
37 W4B32463 Display Panel 2 1
38 W4B33057 M2.5 Support 6
39 W4H33209C Block 1
40 W4H33209D Block 2
Mechanical Parts List for Fig. 2-3 (Front Panel)
Parts No. Description QTY.
41 34E100224 Key Top for POWER-switch 1
42 33E32852B Key Top (21-NS) 2
43 W42E32456C Key Top (21-NS) 2
44 W42E32456D Key Top (21-NS) 2
45 W42E32456 Key Top (21-NS) 1
46 W42E32456B Key Top (21-NS) 1
47 W42E32456E Key Top (21-NS) 1
48 W42E32456F Key Top (21-NS) 1
2
Mechanical Configuration

Section 2 Mechanical Configuration
2-4
2.4 Cabinet Disassembly