Voltage Measurement And Signal Tracing; Power-Up Self-Check Errors; Table 4-1. Power-Up Self-Check Error Codes - Motorola ASTRO Digital Spectra Service Manual

4-2
4.1.2

Voltage Measurement and Signal Tracing

In most situations, the problem circuit may be identified using a dc voltmeter, RF millivoltmeter, and
oscilloscope (preferably with 100 MHz bandwidth or more). The "Recommended Test Equipment,
Service Aids, and Tools" section in the ASTRO Digital Spectra and Digital Spectra Plus Mobile
Radios Basic Service Manual (68P81076C20) outlines the recommended tools and service aids
which would be useful. Of special note are:
• 30-80370E06 Extender Cable which provides an extension cable for VOCON board connector
J501 and command board connector P501.
• RPX-4725A Command and Control Service Cable Kit which provides extension cables for
servicing digital and analog circuits.
• RPX-4724A RF Service Cable Kit which provides interface cables needed to service the RF
boards.
In some cases dc voltages at probe points are shown in red on the schematics. In other areas
diagrams are included to show time-varying signals, which should be present under the indicated
circumstances. It is recommended that a thorough check be made prior to replacement of any IC or
part. If the probe point does not have a signal reasonably close to the indicated one, a check of the
surrounding components should be made prior to replacing any parts.
4.1.3

Power-Up Self-Check Errors

Each time the radio is turned on the MCU and DSP perform some internal diagnostics. These
diagnostics consist of checking the programmable devices such as the FLASH ROMs, internal and
external EEPROMs, SRAM devices, and ADSIC configuration bus checksum. At the end of the
power-up self-check routines, if an error exists, the appropriate error code is shown on the display.
Self-test errors are classified as either "fatal" or "non-fatal." Fatal errors will inhibit user operation;
non-fatal errors will not. For non-display radios, the error codes may be read using the Radio Service
Software (RSS) from the SB9600 bus on the universal connector.
codes, describes the codes, and recommends troubleshooting charts for investigating the cause of
the failure.
Error
Code
01/02
01/81
01/82
01/84
01/88
01/90
July 1, 2002
When checking a transistor or module, either in or
!
out of circuit, do not use an ohmmeter having more
than 1.5 Vdc appearing across test leads or use an
ohms scale of less than x100.
C a u t i o n

Table 4-1. Power-Up Self-Check Error Codes

Description
External EEPROM checksum non-fatal error
ROM checksum failure
External EEPROM checksum failure
EEPROM is blank
RAM failure - Note: Not a checksum failure
General hardware failure
Troubleshooting Procedures: ASTRO Spectra Procedures
Table 4-1
Chart C.2 (p. 4), C.7 (p. 8)
Chart C.6 (p. 7)
Chart C.2 (p. 4), C.7 (p. 8)
Chart C.2 (p. 4), C.8 (p. 8)
Chart C.2 (p. 4), C.9 (p. 9)
Chart C.2 (p. 4), C.5 (p. 7)
lists self-check error
Troubleshooting Chart
68P81076C25-C