Chapter 9 Schematic Diagrams, Overlays, And Parts Lists; Introduction - Motorola HT Series Detailed Service Manual

Schematic Diagrams, Overlays, and Parts Lists: Introduction
Chapter 9 Schematic Diagrams, Overlays, and Parts
9.1

Introduction

This chapter provides schematic diagrams, overlays, and parts lists for the radio circuit boards and
interface connections.
9.1.1 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
Lists
9-1