Anritsu MP1764C User manual

Document No.: M-W1850BE-2.0
Measurement Solutions
ANRITSU CORPORATION
To ensure that this equipment is used safely, impor-
tant safety items are explained in the MP1764C Error
Detector Operation Manual.
This manual explains important service items re-
lated service. Read the operation manual, sche-
matics, and this manual, and keep these with the
equipment.
MP1764C
Error Detector
Service Manual
Second Edition

ii
MP1764C
Error Detector
Service Manual
1 April 2001 (First Edition)
2 July 2001 (Second Edition)
Copyright © 2001, 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

iii
Notes On Export Management
This product and its manuals may require an Export License/Approval by
the Government of the product's country of origin for re-export from you
r
country.
Before re-exporting the product or manuals, please contact us to confirm
whether they are export-controlled items or not.

iv
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 part 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 equip-
ment specified functions, performance or reliability.

v
Power Line Fuse Protection
For safety, Anritsu products have either one or two fuses in the AC power lines as
requested by the customer when ordering.
Single fuse: A fuse is inserted in one of the AC power lines.
Double fuse: A fuse is inserted in each of the AC power lines.
Example: An example of the double fuse is shown below:
Fuse Holders

vi

I
About This Manual
This service manual is used for the MP1764C Error Detector.
Composition of the service manual:
Service Manual: Describes circuit explanation, troubleshooting, adjustment,
mechanical configuration, PC-board numbers/names, and circuit
diagram numbers.
Schematics: Shows circuit diagrams and parts lists with the drawing num-
bers.
Service manual (M-W1850BE)
Schematics (M-W1850GE)

II
Table of Contents
About This Manual....................................... I
Section 1 General ..................................... 1-1
Section 2 Outline of Operation ................ 2-1
2.1 Block Diagram ............................................................... 2-1
2.2 Principles of Operation .................................................. 2-2
Section 3 Troubleshooting....................... 3-1
3.1 Introduction.................................................................... 3-1
3.2 Repair Policy ................................................................. 3-1
3.3 Location ......................................................................... 3-2
3.4 Countermeasure ageinst Static Electricity .................... 3-4
3.5 Service Kits.................................................................... 3-4
3.6 Equipment Required for Troubleshooting,
Repair and Calibration................................................... 3-5
3.7 Method for Checking Waveform.................................... 3-7
3.8 Overall Troubleshooting ................................................ 3-9
Section 4 Waveform at Check Point ....... 4-1
4.1 Introduction.................................................................... 4-1
4.2 Checking DC Power-supply Voltage ............................. 4-2
4.3 Waveforms .................................................................... 4-4
Section 5 Confirmation on Parts
Replacement ............................ 5-1
5.1 Note during Repair ........................................................ 5-1
5.2 Operation Confirmation after Repair ............................. 5-2
Section 6 Mechanical Configuration ....... 6-1
6.1 Introduction.................................................................... 6-1
6.2 Disassembly .................................................................. 6-2

III
Section 7 Adjustment Procedure ................ 7-1
7.1 A23 CLOCK INPUT BIAS ............................................. 7-1
7.2 A21 FREQ DIVIDER ..................................................... 7-3
7.3 A24 DATA INPUT BIAS ................................................ 7-5
7.4 A25,26 DFF1,2 BIAS..................................................... 7-7
7.5 A22 DEMUX (H)............................................................ 7-8
Appendix A Circuit Diagram ..................... A-1

IV.

Section 1 General
1-1
This is the service manual of the MP1764C Error Detector for smooth maintenance
and service work of the service personnel, and does not supplied to customers. Only
used for service personnel.
Our basic policy to the repair is return to the factory system, i.e. the defective instru-
ment should be returned to Anritsu for repair.
However, it may be time consuming and some kinds of repairs can be easily done in
the field.
Therefore, Anritsu allows only those whom Anritsu has authorized to open the in-
strument and repair it.
As clearly stated in the WARRANTY statement, any unauthorized modification, re-
pair, or attempt to repair will render the warranty void.
This service manual is composed of SECTION 1 to SECTION 7, and APPENDIX A
whose details are summerized below:
SECTION 2 OUTLINE OF OPERATION
This section describes the outline of operation.
SECTION 3 TROUBLESHOOTING
This section describes how to find the faulty portion.
SECTION 4 WAVEFORM AT CHECK POINT
This section shows the typical waveform at each check point.
SECTION 5 NOTE ON PARTS REPLACEMENT
This section describes caution and operation confirmation at and af-
ter replacing parts.
SECTION 6 MECHANICAL CONFIGURATION
This section describes how to disassemble the MP1764C.
SECTION 7 ADJUSTMENT PROCEDURE
This section describes how to adjust the MP1764C.
APPENDIX A CIRCUIT DIAGRAM
This section provides the circuit diagrams of the MP1764C.
For the composition, specifications, operating instructions, performance checks and a
detailed description of the panel controls; refer to the separate operation manual.

Section 1 General
1-2.

Section 2 Outline of Operation
2-1
This section describes the operation outline of the MP1764C Error Detector.
2.1 Block Diagram
The first page of the APPENDIX A shows the MP1764C block diagram.
Table 2-1 shows the package list of the MP1764C.
Table 2-1 Package List of MP1764C
A No. PKG DRAWING No. REMARKS
Main Frame E-parts 44Y109138
A01 MOTHER BOARD 44Y109140
A02 DISPLAY 44Y100196
A03 POWER SUPPLY 44Y100197
A04 I/O 44Y100079
A05 CPU 44Y99938
A08 DEMUX (L) 44Y109141
A10 PGED1 44Y109143
A11 SYNC 44Y109144
A12 PGED2 44Y109143
A17 GP-IB1 44Y100207
A18 GP-IB2 44Y100208
A20 POWER BRANCH 44Y100209
A21 FREQ. DIVIDER 44Y100210
A22 DEMUX (H) 44Y100211
A23 CLOCK INPUT BIAS 44Y100212
A24 DATA INUT BIAS 44Y100213
A25 DFF1 BIAS 44Y100214
A26 DFF2 BIAS 44Y100701
E No. MODULE DRAWING No. REMARKS
E4 MHL70840B
CLOCK INPUT
429H15439L
E5 MHL70830B
DATA INPUT
429H15439N
E6 MHL70730A DFF1 429H15437
E7 MHL70730A DFF2 429H15437

Section 2 Outline of Operation
2-2.
2.2 Principles of Operation
Data stream of the MP1764C is consists of DATA INPUT (E5 DATA INPUT, A24
DATA INPUT BIAS), DFF 1, 2 (E6 DFF 1, A25 DFF 1 BIAS, E7 DFF 2, A26 DFF 2
BIAS), DEMUX (H) (A22), DEMUX (L) (A08), PGED 1, 2 (A10 PGED 1, A12
PGED 2), SYNC (A11).
Clock stream of the MP1764C is consists of VARIABLE DEALY with DC MOTOR
(E3), CLOCK INPUT (E4, A23), COAXIAL SWITCH (S2), FREQUENCY DI-
VIDER (A21) and DEMUX (L) (A22).
The MP1764C measures the input DATA error rate with the input CLOCK rate by
inputting DATA (NRZ) and CLOCK. The DATA input to the MP1764C is demulti-
plexed to 128 signals with 1/128 data rate.
These signals are synchronized with 128 reference signals with the same data rate
and compared with the reference signals bit-by-bit. The DFF 1, 2, DEMUX (H),
DEMUX (L) and PGED 1, 2 sections demultiplex the input DATA to 128 signals
with 1/128 data rate. PGED 1, 2 generates 128 reference signals with 1/128 data
rate.
The CLOCK for demultiplexing is made by shaping and frequency-dividing the input
CLOCK signal at CLOCK INPUT and FREQUENCY DIVIDER. The sections that
compare the input signal and the reference signal bit-by-bit are PGED 1 and 2.
Counters in PGED 1 and 2 count the number of errors detected.
SYNC synchronizes the input signal to the reference signal.
All the above-mentioned hardware is controlled by CPU (A05), I/O (A04), GPIB 1
(A17), GPIB 2 (A18) and DISPLAY (A02).

Section 3 Troubleshooting
3-1
3.1 Introduction
This section describes how to troubleshoot the MP1764C Error Detector when ab-
nomalities occur during measurement or performance checks.
3.2 Repair Policy
Repair of the MP1764C is just to replace the faulty package (PC board on which
parts mounted), unit, or hybrid IC (HIC), after checking the waveforms at check
points.
The waveforms are shown in SECTION 4.
Adjustment is required for some packages, units, and HICs after repair.
See also SECTION 5 for the confirmation after repair.
The disassembling the MP1764C is shown in SECTION 6.

Section 3 Troubleshooting
3-2
3.3 Location
Locations of packages, units, and Hybrid ICs are shown in Fig. 3-1.
Front side
Fig. 3-1 (1/2) Parts Location
DELAY CABLE
A23
CLOCK INPUT
BIAS
COAX
SWITCH
CLOCK
INPUT
E4
A20
POWER
BRANCH
A21
FREQ.
DIVIDER
A22
DEMUX (H)
DFF2
E7
DFF1
E6
DATA
INPUT
MHL70730A
MHL70830B
E5
A25
DFF1
BIAS
DFF2
BIAS
A26
A24
DATA INPUT
BIAS
MHL70840B

3.3 Location
3-3
A04 A05 A08 A10 A11 A12
IO CPU DEMUX (L) PGED1 SYNC PGED2
A3
POWER SUPPLY
Fig. 3-2 (2/2) PC-Board Connector Location
X22 W133
X16 W132
X23 W131
X12
X17 W130
X4 W62
X3 W61
X6 W64
X7 W65
X5 W63
X8 W66
X21 W129
X13 W128
X20 W127
X12 W126
X13
X14
X11
X11 W60
X10 W154
X1 W66
X12 W104
X11 W103
X10 W102
X9 W101
X11 –
X10 –
X1 –
X4 W100
X3 W99
X2 W105
X1 W63
X3 W64
X7 W129
X6 W128
X5 W127
X4 W126
X2 W61
X5 W65
X7 W133
X6 W132
X5 W131
X4 W130
X2 W62

Section 3 Troubleshooting
3-4
3.4 Countermeasure against Static Electricity
To prevent damage caused by static electricity, always put a conductive mat on the
servicing bench. In addition, the service personnel should wear a wrist strap as
shown in Fig. 3-2.
Fig. 3-2 Countermeasure against Static Electricity
3.5 Service Kits
The service kit in Table 3-1 is required for troubleshooting.
Conductive mat
Wrist strap

3.6 Equipment Required for Troubleshooting, Repair and Calibration
3-5
3.6 Equipment Required for Troubleshooting, Repair
and Calibration
The equipment listed in Table 3-1 are recommended for troubleshooting, repair and
calibration. Different test equipment that meets the specifications listed in the table,
can be used.
Table 3-1 (1/2) Equipment Required for Troubleshooting
and Repair (1/2)
Required
equipment Required performance Use for
Sampling oscilloscope Frequency band : Up to 50 GHz Waveform
MP1763A/B/C PPG
(Anritsu)
Frequency range :
50 MHz to 12.5 GHz
Signal Source
MP1764A/C ED
(Anritsu)
Frequency range :
50 MHz to 12.5 GHz
Error Rate
Probe Frequency range : DC to 6 GHz Waveform
ECL terminator Frequency range : DC to 10 GHz ECL level termination
for monitoring
waveform
Digtal Oscilloscope Frequency range : Up to 1 GHz Waveform
SMA-SMB Adaptor Connector-type
conversion
for checking, the out-
put from PC board
Frequency divider (*1)
44Y100210
Frequency range : Up to 500 MHz Trigger source
(*1) A21 (FREQ. DIVIDER, 44Y100210) can be used as a frequency divider by the
re-making described below:
•Remove C1, L1, and L2.
•Short-circuit the two land patterns of C1 with jumper wires.
•Use the following 4 DC power supplies from A21-X8 connector.
Note that the power supplies must be turned on/off, simultaneously.
–2 V : X8- 3, 4 pins
–4.5 V : X8- 5, 6 pins
+5 V : X8- 9, 10 pins
–5.2 V : X8- 7, 8 pins

Section 3 Troubleshooting
3-6
Table 3-1 (2/2) Equipment Required for Troubleshooting
and Repair (2/2)
--- Service Kit
NAME DRAWING No. REMARKS
EXTENDER2 (96 PIN) 44Y100787 A04 (CPU), A05 (I/O)
EXTENDER3 (144 PIN) 44Y109148 A10, A11, A12
EXTENDER BOARD 4 44Y98441 A08 (DEMUX (L) )
Accessory 44Y109146