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MAINTENANCE MANUAL
FOR
UHF TRANSMITTER SYNTHESIZER MODULE
19D902780G3, G6 - G9
TABLE OF CONTENTS
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CIRCUIT ANALYSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VOLTAGE CONTROLLED OSCILLATOR . . . . . . . . . . . . . . . . . . . . . . . . . . .
FREQUENCY DOUBLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF AMPLIFIERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REFERENCE BUFFER AMPLIFIER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PRESCALER AND SYNTHESIZER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LOOP BUFFER AMPLIFIERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AUDIO FREQUENCY AMPLIFIER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VOLTAGE REGULATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LOGIC CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TEST PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ALIGNMENT PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PRODUCTION CHANGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IC DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OUTLINE DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ASSEMBLY DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Back Cover
LBI-38671D
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Ericsson Inc.
Private Radio Systems
Mountain View Road
Lynchburg, Virginia 24502
1-800-528-7711 (Outside USA, 804-528-7711)
ASSEMBLY DIAGRAM
UHF TRANSMITTER
SYNTHESIZER MODULE
19D902780G3, G6 - G9
(19D902780, Sh. 1, Rev. 3)
Printed in U.S.A.
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Summary of Contents for Ericsson 9D902780G3
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Page 1: Table Of Contents
ASSEMBLY DIAGRAM ........Back Cover UHF TRANSMITTER SYNTHESIZER MODULE 19D902780G3, G6 - G9 (19D902780, Sh. 1, Rev. 3) Ericsson Inc. Private Radio Systems Mountain View Road Lynchburg, Virginia 24502 1-800-528-7711 (Outside USA, 804-528-7711) -
Page 2: Description
Q1. This turns ON the VCO. • frequency modulated signal at the desired frequency. The mod- A reference buffer amplifier. ule contains the following functional blocks: Copyright © June 1992, Ericsson GE Mobile Communications, Inc. -
Page 3: Prescaler And Synthesizer
LBI-38671 The output of the second buffer (U501B) is applied to a PRESCALER AND SYNTHESIZER loop filter consisting of R506, R507, R508, C505 and C506. This filter controls the bandwidth and stability of the synthe- Integrated circuit U402 is the heart of the synthesizer. It sizer loop. -
Page 4: Logic Circuits
LBI-38671 LOGIC CIRCUITS TEST PROCEDURE ALIGNMENT PROCEDURE SERVICE NOTES The following service information applies when Logic circuitry (other than that inside the synthesizer IC - (Steps 5, 6, and 7 can be done using a modulation Apply +13.8 Vdc and -12 Vdc. Verify the current analyzer or UHF receiver with 750 µs de-emphasis switch- aligning, testing, or troubleshooting the TX Synthe- U402) consists of the following:... -
Page 5: Parts List
PARTS LIST LBI-38671 SYMBOL PART NO. DESCRIPTION UHF TRANSMITTER SYNTHESIZER MODULE TROUBLESHOOTING GUIDE 19D902780G3, G6 - G9 C202 19A702061P99 Ceramic: 1000 pF + or -5%, 50 VDCW, temp coef 0 + or -30 PPM/°C. ISSUE 5 C203 19A705205P2 Tantalum: 1 uF, 16 VDCW; sim to Sprague 293D. SYMBOL PART NO. - Page 6 PARTS LIST LBI-38671 SYMBOL PART NO. DESCRIPTION SYMBOL PART NO. DESCRIPTION SYMBOL PART NO. DESCRIPTION SYMBOL PART NO. DESCRIPTION C505 19A703684P3 Metalized polyester: 2.2 uF + or - 10$, 50 VDCW. 19C851001P1 Coil, RF: sim to Paul Smith SK901-1. R215 19B800607P331 Metal film: 330 ohms + or -5%, 1/8 w.
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Page 7: Production Changes
PRODUCTION CHANGES & IC DATA LBI-38671 PRODUCTION CHANGES U201 and U203 U202 19A705927P11 Changes in the equipment to improve or to simplify circuits are identified by a 344A3907P1 "Revision Letter", which is stamped after the model number of the unit. The Silicon Bipolar MMIC Silicon Bipolar MMIC revision stamped on the unit includes all previous revisions. -
Page 8: Ic Data
IC DATA LBI-38671 U401 U701 & U705 19A149944P201 19A703483P302 Dual Modulus Prescaler Quad 2-Input NAND Gate U402 19B800902P5 Synthesizer U702 19A703471P120 Address Decoder U502 19A702705P4 Quad Analog Switch... -
Page 9: Outline Diagram
OUTLINE DIAGRAM LBI-38671 COMPONENT SIDE SOLDER SIDE (19D902779, Sh. 2, Rev. 2) (19D903361, Layer 1 & 4, Rev. 0) UHF TRANSMITTER SYNTHESIZER BOARD 19D902779G3, G6 - G9... -
Page 10: Schematic Diagram
SCHEMATIC DIAGRAM LBI-38671 UHF TRANSMITTER SYNTHESIZER 19D902780G3, G6 - G9 (19D903363, Sh. 1, Rev. 5) - Page 11 SCHEMATIC DIAGRAM LBI-38671 UHF TRANSMITTER SYNTHESIZER 19D902780G3, G6 - G9 (19D903363, Sh. 2, Rev. 3)
- Page 12 SCHEMATIC DIAGRAM LBI-38671 UHF TRANSMITTER SYNTHESIZER 19D902780G3, G6 - G9 (19D903363, Sh. 3, Rev. 2)
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