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APPENDIX
Troubleshooting
In stand-by mode the DMM 4650 runs a number of test routines in order to detect device faults at an early
stage. Errors are indicated by the flashing of the green POWER LED. With fatal errors or when errors
start to appear more often the blinking of the LED gets faster and the fault relay drops. At the same time,
the audio input is connected directly to the output via the bypass relay.
The menu “self test” provides a listing of error numbers and occurence of the following messages:
No: Error Name Function test
1 Reset Power-On counter, no message displayed
2 Software faulty micro processor interrupt
3 Modul-ID changing number and activity of control ports (A-D) during power-on
4 +/- 15V tests internal supply-voltage ± 15V
5 Bypass function of audio bypass relay (hardware and software)
6 Fault function of fault relay (hardware and software)
7 User-mem data error of passwords and their priorities
8 Trig-mem data error in trigger settings
9 Sequ-mem data error in user presets of sequences
10 Stop-mem data error in user settings of stop triggers
11 Alrm-mem data error in alarm user presets
12 Gong-mem data error in gong user presets
13 Msg-dir data error in message file management
14 Msg-chsu data error in message audio data (see also “message” on page 14 “*”)
15 ARS-RAM communication error in DSP processor
16 ARS-mod software error in DSP processor
17 Flash tests for a changed number of flash memory cards
18 Block faulty blocks in flash memory has been occurred later
19 EEPROM error at writing into EEPROM
20 ROM data modification of the microprocessor’s EPROM
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