Chapter 4 Schematic Diagrams, Overlays, And Part Lists; Introduction; Notes For All Schematics And Circuit Boards - Motorola Pro Series Elite Service Manual

Chapter 4 Schematic Diagrams, Overlays, and Part
4.1

Introduction

This chapter provides schematic diagrams, overlays, and parts lists for the radio circuit board 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 multime-
ter 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
200 Series
300 Series
400/500 Series
600 Series
3200 Series
3300 Series
3500 Series
3700/3800 Series =
4. Interconnect Tie Point Legend:
UNSWB+
SWB+
R5
CLK
Vdda
Vddd
CSX
SYN
DACRX
VSF
VR
Lists
= Transmitter UHF
= Frequency Generation UHF
= Receiver UHF
= Controller
= Keypad Board
= IF Circuitry
= Receiver VHF
= Transmitter VHF
Frequency Generation VHF
= Unswitch Battery Voltage (7.5V)
= Switch Battery Voltage (7.5V)
= Receiver Five Volts
= Clock
= Regulated 3.3 Volts (for analog)
= Regulated 3.3 Volts (for digital)
= Chip Select Line (not for LVZIF)
= Synthesizer
= Digital to Analog Voltage (For Receiver Front End Filter)
= Voltage Super Filtered (5 volts)
= Voltage Regulator
4-1