Denon AVR-1908 Service Manual page 13

CHECK WITH TEST MODE
µcom/DSP Error Display Mode
1. Operation Spec
µcom version display mode:
When the following conditions are satisfied at its starting state, error information is displayed before version information.
Starting method (same as µcom version display):
E3,EUT,E1C model
While pressing 2 buttons, "STATUS" and "DIMMER", turn on on/off button.
Then, press "STATUS" button to display the following information on the FL Display.
E2,E2A model
While pressing 2 buttons, "RT" and "PTY", turn on on/off button.
Then, press "RT" button to display the following information on the FL Display.
E3,EUT,E1C model
on/off button
2. Display Order
Error information → Destination information → Main-µcom version information → Sub-µcom version information
→ DSP version information
3. Display
Any one of the following list is displayed, in the priority of ①②③④ .
Condition
No response from Sub-µcom
① Sub-µcom NG
No response from DIR
DIR NG
②
When DSP boot, executing DSP reset makes no change to BUSY port "L".
No change to BUSY port "L" before issuing DSP command.
When DSP data read, executing WRITE="L" makes no change to ACK="H". " □ ＤＳＰ1 □ ＥＲＲＯＲ □０３□ "
When DSP data read, executing REQ="L" makes no change to ACK="L".
When DSP data write, executing WRITE="H" makes no change to ACK="H".
③ DSP1 NG
When DSP data write, executing REQ="L" makes no change to ACK="L".
When DSP special code boot, executing DSP reset makes no change to
BUSY port "L".
No change to BUSY port "L" before issuing DSP special read command.
No change to BUSY port "L" before DSP version read.
Both SUB/DSP
④
OK
DIMMER STATUS
State
AVR-1908 / AVR-788
E2,E2A model
on/off button
13
PTY RT
Display
" □ ＳＵＢ □□ ＥＲＲＯＲ □０１□ "
" □ ＤＩＲ □□ ＥＲＲＯＲ □０１□ "
" □ ＤＳＰ1 □ ＥＲＲＯＲ □０１□ "
" □ ＤＳＰ1 □ ＥＲＲＯＲ □０２□ "
" □ ＤＳＰ1 □ ＥＲＲＯＲ □０４□ "
" □ ＤＳＰ1 □ ＥＲＲＯＲ □０５□ "
" □ ＤＳＰ1 □ ＥＲＲＯＲ □０６□ "
" □ ＤＳＰ1 □ ＥＲＲＯＲ □１１□ "
" □ ＤＳＰ1 □ ＥＲＲＯＲ □１２□ "
" □ ＤＳＰ1 □ ＥＲＲＯＲ □１３□ "
(No error display, version display only)