Reference Designator Assignment
Interconnect Tie Point Legend
Integrated Circuit Details with Pin-Out Names
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 loading.
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
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 |
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
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
58
