
4-1
Chapter 4 Schematic Diagrams, Overlays, and Parts
Lists
4.1
Introduction
This chapter provides schematic diagrams, overlays, and parts lists for the radio circuit boards and
interface connections.
4.1.1
Notes For All Schematics and Circuit Boards
* Component is frequency sensitive. Refer to the Electrical Parts List for value and usage.
1. Unless otherwise stated, resistances are in Ohms (k = 1000), and capacitances are in
picofarads (pF) or microfarads (µF).
2. DC voltages are measured from point indicated to chassis ground using a Motorola DC
multimeter or equivalent. Transmitter measurements should be made with a 1.2 µH choke in
series with the voltage probe to prevent circuit loading.
3. Reference Designators are assigned in the following manner:
- 100 Series = Transmitter
- 200 Series = Frequency Generation
- 300 Series = Receiver
- 400/500 Series = Controller and Low-Band Receiver Front End
- 600 Series = Keypad Board
4. Interconnect Tie Point Legend:
- UNSWB+ = Unswitched Battery Voltage (7.5 V)
- SWB+ = Switched Battery Voltage (7.5 V)
- R5 = Receiver Five Volts
- CLK = Clock
- Vdda = Regulated 3.3 Volts (for analog)
- Vddd = Regulated 3.3 Volts (for digital)
- CSX = Chip Select Line (not for LVZIF)
- SYN = Synthesizer
- DACRX = Digital to Analog Voltage (For Receiver Front End Filter)
- VSF = Voltage Super Filtered (5 V)
- VR = Voltage Regulator
LAYER 1 (L1)
LAYER 2 (L2)
LAYER 3 (L3)
LAYER 4 (L4)
LAYER 5 (L5)
LAYER 6 (L6)
INNER LAYERS
SIDE 1
SIDE 2
6-LAYER CIRCUIT
COPPER STEPS IN PROPER
LAYER SEQUENCE
BOARD DETAIL VIEWING
Содержание PR860
Страница 1: ...PR860 Two Way Portable Radio Detailed Service Manual ...
Страница 2: ......
Страница 5: ...iv Notes ...
Страница 9: ...viii Table of Contents Notes ...
Страница 13: ...Notes xii List of Figures ...
Страница 17: ...1 4 Introduction Radio Model Information Notes ...
Страница 51: ...2 34 Theory of Operation Voltage Control Oscillators VCO Notes ...
Страница 81: ...4 4 Schematic Diagrams Overlays and Parts Lists Flex Layout Notes ...
Страница 193: ...4 116 Schematic Diagrams Overlays and Parts Lists Low Band Section Notes ...
Страница 196: ......