Notes For All Schematics And Circuit Boards - Motorola CDM Series Service Manual

Chapter 1: 2-4
To replace the shield:
1. Add solder to the shield, if necessary, using a micro-tipped soldering iron.
2. Rub the soldering iron tip along the edge of the shield to smooth out any excess solder. Use
solder wick and a soldering iron to remove excess solder from the solder pads on the circuit
board.
3. Place the circuit board back in the R1070 circuit board holder.
4. Place the shield on the circuit board using a pair of tweezers.
5. Position the heat-focus head over the shield and lower it to approximately 0.3 cm (1/8") above
the shield.
6. Turn on the heater and wait for the solder to reflow.
7. Once complete, turn off the heat, raise the heat-focus head, and wait approximately one
minute for the part to cool.
8. Remove the circuit board and inspect the repair. No cleaning should be necessary.
5.0

Notes For All Schematics and Circuit Boards

* Component is frequency sensitive. Refer to the Electrical Parts List for value and usage.
Unless otherwise stated, resistances are in Ohms (K = 1000, M = 1,000,000), and
•
capacitances are in picofarads (pF), nanofarads (nF), or microfarads (µF).
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
(microHenry) choke in series with the voltage probe to prevent circuit loading.
Interconnect Tie Point Legend:
•
16_8MHz
3V3
5V
5V
5V RF
5V SOURCE
5VD
9V3
9V3FLT
A+
ADDR
AN
ANALOG INPUT 2
ANALOG INPUT 3
BATTERY VOLTAGE
BL A GREEN
BL A RED
BL GREEN
6881091C63-A
Notes For All Schematics and Circuit Boards
16.8MHz Reference Frequency
Regulated 3.3V Supply Voltage for Voice Storage
Regulated 5V Supply Voltage for RF Circuitry
Regulated 5V Supply Voltage (Control Head)
Regulated 5V Supply Voltage for RF Circuitry
5V Signal to Switch On Control Head
Regulated 5V Supply Voltage for Digital Circuitry
Regulated 9.3V Supply Voltage
Filtered 9.3V Supply Voltage
13.2V Supply Voltage
Microprocessor (µP) Address Lines
Analog Lines to Analog-to-Digital Converter
External Keypad Matrix Column Signal
External Keypad Matrix Row Signal
Battery Voltage Sense Line
Back Light Anode Green
Back Light Anode Red
Green Back Light Control