Motorola HT-1000 - SERVICE Manuel de service télécharger pdf (Page 80)

from the overall schematic. The following two notes are general and

apply to all schematic and circuit board applications.

1. Unless otherwise stated, resistor values are in ohms (k = 1000),

capacitor values are in picofarads (pF) or microfarads (µF), and

inductor values are in microhenrys (µH) or nanohenrys (nH).

2. DC voltages are measured from point indicated to chassis ground

using a high impedance (10 megohm) Motorola DC voltmeter or

equivalent. Transmitter measurements should be made with a

1.2uF choke in series with the voltage probe to prevent circuit

Reference Designator

Assignment

Reference designators are assigned in the following manner:

• Units Series = Receiver

• 100 SERIES = Transmitter

• 200 SERIES = Frequency Generation

• 300 SERIES = Miscellaneous

• 400 SERIES = Housing/Escutcheon

• 500 SERIES = Display

• 600 SERIES = Hear Clear Option

• 700 SERIES = Controller

Interconnect Tie Point

Legend

5V REG = Regulated Five Volts

B+ = Battery Voltage (7.5V)

R5 = Receiver Five Volts

T5 = Transmitter Five Volts

CLK = Clock

D=Data

DAC = Digital To Analog Converter

DAC RST = DAC Reset

LCK = Lock

NC = No Connection

SYN = Synthesizer

VR = Voltage Regulator

Integrated Circuit Details

with Pin-Out Names

Because of today’s technology, integrated circuits and special modules

are able to perform a vast amount of functions in a single component.

The components are getting smaller and the number of IO pins is

getting greater, to the point that there is not enough room to put

enough IC information on the schematics and circuit boards. To help

troubleshoot and signal trace this family of radios, several of the IC’s

are detailed with pin-out names and illustrated on the next few pages.

Remember that PBGA components in a radio can be a combination of

OMPAC and/or Glob Top. Although the illustrations on the next few

pages reflect OMPAC devices, like Good-by components are

electrically the same.

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Motorola HT-1000 - SERVICE Manuel de service Page 80

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