Motorola GP series Manuale di servizio - Pagina 21

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Motorola GP series Manuale di servizio

Notes For All Schematics and Circuit Boards

5.0
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 µF choke in
series with the voltage probe to prevent circuit loading.
3. Interconnect Tie Point Legend:
UNSWB+
SWB+
R5
CLK
Vdda
Vddd
CSX
SYN
DACRX
VSF
VR
6-LAYER CIRCUIT BOARD DETAIL VIEWING
COPPER STEPS IN PROPER LAYER SEQUENCE
=
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
SIDE 1
LAYER 1 (L1)
LAYER 2 (L2)
LAYER 3 (L3)
LAYER 4 (L4)
LAYER 5 (L5)
LAYER 6 (L6)
SIDE 2
INNER LAYERS
2-5