Motorola Astro Xts5000 Detailed 6881094c31 E Manual

November 16, 20066881094C31-E
xxxPortable Radio Model Numbering System
Notes 

Chapter 1 Introduction
1.1 General
This manual includes all the information needed to maintain peak product performance and 
maximum working time for the ASTRO XTS 5000 radio. This detailed level of service (component 
level) is typical of the service performed by some service centers, self-maintained customers, and 
distributors.
Use this manual in conjunction with the ASTRO XTS 5000 VHF/UHF Range 1/700–800 MHz Digital 
Portable Radios Basic Service Manual (Motorola part number 6881094C28), which can...

November 16, 20066881094C31-E
1-2Introduction: Notations Used in This Manual
1.2 Notations Used in This Manual
Throughout the text in this publication, you will notice the use of warnings, cautions, and notes. 
These notations are used to emphasize that safety hazards exist, and care must be taken and 
observed.
NOTE:An operational procedure, practice, or condition that is essential to emphasize.
CAUTION indicates a potentially hazardous situation which, if 
not avoided, might
 result in equipment...

Chapter 2 Radio Power
This chapter provides a detailed circuit description of the power distribution of an ASTRO XTS 5000 
radio.
2.1 General
In the ASTRO XTS 5000 radio, power (B+) is distributed to two boards: the transceiver (RF) board 
and the VOCON board (see Figure 2-1 on page 2-2 for UHF Range 1 (R1) and 700–800 MHz, and 
Figure 2-2 on page 2-2 for VHF). For kit NNTN5567, the VOCON board supplies VSW1, regulated 
3.6Vdc, from the MAKO switching regulator to the XCVR. In the case of a secure model...

November 16, 20066881094C31-E
2-2Radio Power: General
Figure 2-1.  DC Power Distribution—UHF Range 1 and 700–800 MHz Radios
Figure 2-2.  DC Power Distribution—VHF and Range 2 Radios
Battery
7.5 Volts
(Nominal)RF Board
J1 BATT
Fuse
RAW B+
V5A
5 Volts
SW_B+
(control signal)
3VA1.55V
3 Volts
Analog Circuits3 Volts
Digital CircuitsFB+
P1UNSW_B+
VCC55 Volts
FET
GCAP II SW_B+
3.8 V (VSW1)
1.55 Volts
(VSW_1.55)1.875 Volts
(VSW2)
3 Volts
(VREF)3 Volts
(V2) VOCON Board
P201
MAEPF-27419-A
Battery
7.5 Volts...

6881094C31-ENovember 16, 2006
Radio Power: General2-3
Figure 2-3.  DC Power Distribution—UHF Range 1 and 700–800 MHz Radios (for NNTN5567)
Figure 2-4.  DC Power Distribution—VHF and Range 2 Radios (for NNTN5567)
B+ from the battery is electrically switched to most of the radio, rather than routed through the On/
Off/volume control knob, S1. The electrical switching of B+ supports a keep-alive mode. Under 
software control, even when the On/Off/volume control knob has been turned to the Off position,...

November 16, 20066881094C31-E
2-4Radio Power: DC Power Routing—Transceiver Board
2.2 DC Power Routing—Transceiver Board
NOTE:Refer to Table 8-1, “List of Transceiver Schematics and Board Overlays,” on page 8-1 for a 
listing of schematics showing the transceiver board DC power routing components.
Connector J1, the B-plus assembly, connects the battery to the transceiver board. Capacitors C1, 
C2, and C3 provide protection against momentary breaks at the B-plus connector due to contact 
bounce when the...

6881094C31-ENovember 16, 2006
Radio Power: DC Power Routing—VOCON Board 2-5
In the case of a secure radio model, SW B+ and UNSW B+ are also supplied to the encryption 
module through connector J701.
Transistor Q501 is also under the control of the microcontroller unit (MCU) via Vref from U501. This 
allows the MCU to follow an orderly power-down sequence when it senses that B+SENSE is off. This 
sense is provided through MECH_SW_BAR (inverted B+SENSE, see Q508). In NNTN5567, the 
MCU detects that B+SENSE...

November 16, 20066881094C31-E
2-6Radio Power: DC Power Routing—VOCON Board
V2 3 Vdc*
2.9 Vdc**Linear 
regulator 
software 
progammable2.775 Vdc Patriot I/O ring
Flipper IC
EEPOT
Display
16.8 MHz buffer
VSW_1_55V 1.55 Vdc Linear 
regulatorN/A Patriot core (only on 
NNTN4717 VOCON board)
* = NTN9564,NNTN4563 & NNTN4819 VOCON kits
** = NNTN4717 VOCON kit
Table 2-5.  VOCON Board DC Power Distribution (for kit: NNTN5567)
Supply 
NameOutput 
Vo l ta g eSupply TypeUnprogrammed 
Output VoltageCircuits Supplied...

Chapter 3 Theory of Operation
This chapter provides a detailed circuit description of the ASTRO XTS 5000 transceiver and VOCON 
boards. When reading the theory of operation, refer to the appropriate schematic and component 
location diagrams located in the back of this manual. This detailed theory of operation can help 
isolate the problem to a particular component.
The ASTRO XTS 5000 radio is a dual-mode (digital/analog), microcontroller-based transceiver 
incorporating a digital signal processor (DSP)....