Motorola Astro Xts5000 Detailed 6881094c31 E Manual

November 16, 20066881094C31-E
3-42Theory of Operation: Encryption Module
The radio power-down sequence begins by opening the radio On/Off switch, which removes the 
B+SENSE signal from the VOCON board. This does not immediately remove power because the 
GCAP II IC has control of Q502 through Vref, and U301 through WDI maintains the GCAP II IC in an 
active state. Both the MCU and Flipper IC monitor B+SENSE. After B+SENSE is removed, the 
Flipper IC waits 125 ms. before releasing WDI to allow for software...

6881094C31-ENovember 16, 2006
Theory of Operation: Encryption Module3-43
Key variables are loaded into the encryption module through connector J701, pin 1. Depending on 
the type of encryption module, up to 16 keys can be stored in the module at a time. The key can be 
infinite key retention or 30-seconds key retention, depending on how the codeplug is set up.
The radio s host processor communicates with the encryption module on the Synchronous Serial 
Interface (SSI) bus. The SSI bus consists of five...

November 16, 20066881094C31-E
3-44Theory of Operation: Encryption Module 

Chapter 4 Troubleshooting Procedures
The purpose of this chapter is to aid in troubleshooting problems with the ASTRO XTS 5000 radio. It 
is intended to be detailed enough to localize the malfunctioning circuit and isolate the defective 
component. It also contains a listing of service tools recommended for PC board repair at the 
component level.
4.1 Handling Precautions
Complementary metal-oxide semiconductor (CMOS) devices, and other high-technology devices, 
are used in this family of radios. While...

November 16, 20066881094C31-E
4-2Troubleshooting Procedures: Recommended Service Tools
4.2 Recommended Service Tools
Table 4-1 lists recommended service tools that can be used for PC board repairs at the component 
level. For listings of additonal service tools, service aids, and test equipment that are recommended 
for all levels of service, refer to the XTS 5000 basic service manual (see “ Related Publications” on 
page xii).
Table 4-1.  Recommended Service Tools
Motorola
Part...

6881094C31-ENovember 16, 2006
Troubleshooting Procedures: Voltage Measurement and Signal Tracing 4-3
4.3 Voltage Measurement and Signal Tracing
It is always a good idea to check the battery voltage under load. This can be done by checking the 
OPT_B+_VPP pin at the side connector (pin 4). The battery voltage should remain at or above 
7.0 Vdc. If the battery voltage is less than 7.0 Vdc, then it should be recharged or replaced as 
necessary prior to analyzing the radio.
In most instances, the problem...

November 16, 20066881094C31-E
4-4Troubleshooting Procedures: Standard Bias Table
4.4 Standard Bias Table
Table 4-2 outlines some standard supply voltages and system clocks which should be present under 
normal operation. These should be checked as a first step to any troubleshooting procedure.
Table 4-2.  Standard Operating Bias
Signal NameNominal ValueTo l e r a n c eVOCON Board Source
13 MHz 13 MHz ±1000 ppm C303 (NTN9564)
C339 (NNTN4563, NNTN4819 & 
NNTN4717)
FLIP_32K 32.768 kHz ±400 ppm U302, pin2...

6881094C31-ENovember 16, 2006
Troubleshooting Procedures: Power-Up Self-Check Errors 4-5
4.5 Power-Up Self-Check Errors
Each time the radio is turned on, the MCU and DSP perform a series of internal diagnostics. These 
diagnostics consist of checking such programmable devices as the FLASH ROMs, the EEPROM, 
and SRAM devices.
Problems detected during the power-up self-check routines are presented as error codes on the 
radio’s display. For non-display radios, the problem is presented at power up by a...

November 16, 20066881094C31-E
4-6Troubleshooting Procedures: Power-Up Self-Check Diagnostics and Repair (Not for Field Use)
4.6 Power-Up Self-Check Diagnostics and Repair (Not for Field Use)
Table 4-5 lists additional action items that can be used for the diagnosis and resolution of the error 
codes listed in Table 4-4 on page 4-5.
01/88 External RAM Fatal Error — Note: Not a checksum error Send radio to depot
01/90 General Hardware Failure Fatal Error Turn radio off, then on
01/92 Security Partition...

6881094C31-ENovember 16, 2006
Troubleshooting Procedures: Power-Up Self-Check Diagnostics and Repair (Not for Field Use) 4-7
01/92 The radio should be sent to the depot for reprogramming of the security codeplug.
01/93 The radio should be sent to the depot for reflashing of the host code.
01/98 Send radio to the depot for replacement of the SRAM U403.
01/A2 The radio should be sent to the depot for reflashing of the tuning codeplug followed by 
re-tuning of the radio.
02/81 The radio should be sent to...