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8341b
HP 8341b User Manual
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A48
Sampler
Assembly
(Under
Cover)
Figure
D-7.
Sweep
Generator
—
YO
Loop
Major
Assemblies
Location
(4
of
5)
D-34
Sweep
Generator
-
YO
Loop
Assembly-Level
Troubleshooting
Change
10
HP
8340B/41B
199
201
Table of Contents
Section 1
4
Table of Contents
4
Introduction
9
Manual Format
9
Required Tools
10
Interconnect Cables and Mnemonics
11
Overall Instrument Theory
12
Reference Loops
12
M/Nloop
12
Loops
13
YO Loop
13
Controller Section
13
Front Panel-Rear Panel
14
RF Section
14
Power Supplies
15
Instrument Access
17
Hp 8340B/41B
17
Calibration Constants
17
User Access
19
Calibration Constants Description
22
How to Restore Factory-Optimized Calibration Constants
29
Troubleshooting Aids
31
Self Test
31
Phase-Lock Indication Leds
31
Power Supply Indication Leds
31
Front Panel Diagnostics
32
Shift Manual
33
Shift Free Run
33
Shift Ext
33
Shift M3
34
Shift M2
34
Shift M1
34
Shift M4
35
Shift M5
35
Shift RF
35
Shift Meter
35
Shift Peak
36
Shift Pwr Sweep
36
Shift Slope
36
Overall Instrument Troubleshooting
37
Front and Rear Panel Items
41
Instrument Preset Conditions (1
42
Fan
43
Fan Runs Slowly, All Leds on
43
Instrument Appears Dead (2
43
Oven Annunciator (5
44
Unlock Annunciator (6
45
Fault Annunciator (7
46
Unleveled Annunciator
47
Overmod Annunciator(9
47
SRQ Annunciator (10
48
Upper Keyboard, Lower Keyboard, Displays (11,12,13
48
Frequency
49
Power (15
49
Sweep (16
50
Spectral Purity/Harmonics (17,18
51
I/O Connectors (19
55
Remote Operation (20
55
Module Exchange Program
56
Repair Procedures
56
How to Clean Printed Circuit Board Fingers
56
Visual Inspection
57
Check Line Cord Ground
57
Check the Line/Neutral
57
Check the Line Fuse
57
After Service Safety Checks
57
Air Filter Replacement
58
Section 2
103
M/Nloop
103
Reference Loop
103
A30100 Mhz
105
A34 Reference Loop M/N Loop Motherboard
105
Assemblies
105
Reference Loop M/N Loop Introduction
105
Reference Loop M/Nloop Introduction
105
Reference Loop Theory of Operation
106
Mhz Frequency Standard
107
A32 M/N VCO Assembly
108
A33 Output Assembly
108
M/N Loop Theory of Operation
108
M/N Phase Detector
109
Diagram
111
Reference Loop Assembly-Level Troubleshooting
111
Internal Frequency Standard Output Check
114
10 Mhz Reference Output Check
115
A30J1 Output Check
115
A30J2 Output Check
117
A30W1 Output Check
118
A29J2 Output Check
119
A29J3 Output Check
119
A29J4 Output Check
120
A29J5 Output Check
121
Reference Oscillator
122
M/N Loop Assembly-Level Troubleshooting
123
M/N Verification and Low Output Power Troubleshooting
123
M/N Output Frequency Incorrect
125
A33J1 Output Check (with Phase Lock Loop Closed)
129
A33J1 Output Check (with Phase Lock Loop Open)
131
A33J2 Output Check
133
A31TP1 Signal Check
135
A31TP2 Output Check
137
A32A1W1 Output Check
139
A31Tp2
140
Repair Procedures
144
Replaceable Parts
150
Section 3
152
Assemblies
153
Introduction
153
Loops
153
In Cw/Manual Mode
154
In Swept Modes
154
Overall Theory of Operation
154
Loop Characteristics
155
Operation
155
PLL2 Theory of Operation
155
PLL3 Theory of Operation
158
PLL1 Theory of Operation
159
Loops Assembly-Level Troubleshooting
162
Troubleshooting Phase Lock Loop
162
Troubleshooting Phase Lock Loop
164
Verify the Divider
166
Replaceable Parts
169
Section 4
170
Introduction
170
Replaceable Parts
170
Sweep Generator
170
Theory of Operation
170
Troubleshooting Block Diagram
170
Yo Loop
170
Assemblies
171
Introduction
171
Sweep Generator YO Loop Overall Theory of Operation
172
Introduction
185
YO Loop Assembly-Level Troubleshooting
185
YO UNLK Swept Mode
188
Introduction
192
No Sweep
192
Sweep Generator Assembly-Level Troubleshooting
192
Incorrect Sweep
193
A23 FM Driver Assembly-Level Troubleshooting
194
Placing the YO Assembly into the Service Position
202
Repair Procedures
202
Replaceable Parts
206
Attaching Hardware
207
Motherboard and Wiring List
211
A62 Motherboard Overall Description
212
Introduction
214
Section 5
240
A60 Processor Assembly-Level Troubleshooting
240
Overall Assembly-Level Troubleshooting
240
Repair Procedure
240
Theory of Operation
240
Assemblies
241
Introduction
241
Low Instrument Preset (LIPS)
242
The Address Bus and Data Bus
242
Theory of Operation
242
A57 Marker/Bandcross Assembly
243
A59 Digital Interface Assembly
244
Assembly Isolation
248
Diagnostics
248
A59 Digital Interface Assembly-Level Troubleshooting
249
Change Detectors
249
Diagnostics
249
Service Request
249
Assembly Isolation
250
A60 Processor Assembly-Level Troubleshooting
252
A60 Processor Self Test Leds
253
Self Tests
253
Shift M4
253
Battery Replacement
263
Repair Procedure
263
Replaceable Parts
265
Section 6
267
Front Panel Rear Panel
267
Front Panel Theory of Operation
267
Introduction
267
Front Panel Overall Assembly-Level Troubleshooting
274
Front Panel Connectors
275
A3 Display Processor Assembly-Level Troubleshooting
276
Equipment Required
276
Procedure
276
A5 Keyboard & A7 Lower Keyboard Assembly-Level Troubleshooting
278
Annunciators
278
A6 Keyboard Interface Assembly-Level Troubleshooting
279
Equipment Required
279
Procedure
279
Front Panel Repair Procedure
283
Front Panel Repair Procedure
289
Front Panel Replaceable Parts
292
Rear Panel Functional Groups
308
Rear Panel Theory of Operation
308
Interface Connectors
312
Line Module
321
Rear Panel Assembly-Level Troubleshooting
321
Rear Panel Replaceable Parts
322
Section 7
326
Introduction
326
Assemblies
328
Leveling
329
Theory of Operation
329
A8 3.7 Ghz Oscillator
330
Pulse Modulation
330
SYTM Driver Compensation
330
A10 Directional Coupler
331
A9 Low Band Pulse Modulator
331
A14 High Band Power Amplifier
332
A16 High Band Modulator/Splitter
332
A17 Low Band Mixer
332
AT3 Isolator
333
J5/J20 Rf
333
Pulse Modulation Assembly
338
Overall Assembly-Level Troubleshooting
340
Troubleshooting Sequence
340
SYTM Peaking Assembly-Level Troubleshooting
342
The Fault Annunciator Comes on
342
ALC Loop Assembly-Level Troubleshooting
344
RF Path Assembly-Level Troubleshooting
347
Repair Procedures
355
Replaceable Parts
366
Section 8
371
Power Supplies/Fan
371
Introduction
372
Primary Power
373
Theory of Operation
373
Power Supplies
375
Regulator
375
Standby Mode
376
Supply Failure Monitoring Circuitry
376
Assembly-Level Troubleshooting
378
Power Supplies/Fan
378
Line Module Troubleshooting
379
Rectifiers and Regulators
379
Power Supplies/Fan
384
Repair Procedures
385
Transformer Replacement
385
Fan Replacement
387
Replaceable Parts
391
Replaceable Parts
528
Other manuals for HP 8341b
Operating Guide
14 pages
Operating Instructions
119 pages
4
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HP 8341b Specifications
General
Frequency Range
10 MHz to 20 GHz
Spurious Output
≤ -60 dBc
Input Impedance
50 Ω
Output Impedance
50 Ω
Operating Temperature
0 to 55 °C
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