Denon DVD-1600 Service Manual page 18

8.4.3. ADSC internal RAM display function
1. Operation/display
Key operation: Main unit PAUSE+OPEN + remote controller [RETURN] Operate the remote controller [CLEAR] key to update
internal RAM address and display 11 learned values.
Table 1 shows the descriptions of the display.
2. How to utilize
At present, learned values of ADSC internal RAM are expected to be useful for the following faulty part identification.
Use how learned value changes from initial value to find whether faulty part exists before or after ADSC in the focus/tracking
servo system.
[Focus system]
When focus gain remains at initial value and tracking gain changes, fault exists before ADSC input.
When focus gain changes and tracking gain remains at initial value, fault exists after ADSC output.
[Tracking system]
When focus gain remains at initial value and tracking gain changes, fault exists after ADSC output.
When focus gain changes and tracking gain remains at initial value, fault exists before ADSC input.
Address
4B4
4BC
4B6
4BE
4B5
4BD
TB0
TB1
DBD
DBC
FC0
BT0
FC1
BT1
Notes:
1. Learned values of focus balance and tracking balance are the coded binary data.
2. DSL offset learned value is effective only in upper 2 digits. (Lower 2 digits, normally 06, are ignored.)
Picking up servo learned value (Determined)
1. Focus (primary)/tracking balance learning ... When leading in focus
2. Focus/tracking gain and equalizer ... When leading in tracking
3. Focus balance (secondary) ... When leading in tacking
[Note]
When fault exists somewhere after tracking servo, the disc type is switched by retry to make learned value different from the
one in normal startup.
Table 1 ADSC internal RAM learned value
Memory data
Focus gain learned value except for DVD DL (L1 layer)
Focus gain learned value of DVD DL (L1 layer)
Focus balance learned value except for DVD DL (L1 layer)
Focus balance learned value of DVD DL (L1 layer)
Tracking gain learned value except for DVD DL (L1 layer)
Tracking gain learned value of DVD DL (L1 layer)
Tracking balance learned value of DVD SL and DL (L0)
Tracking balance learned value of CD and VCD
Tracking balance learned value of DVD DL (L1 layer)
DSL offset learned value of DVD
DSL offset learned value of CD and VCD
Equalizer FC value except for DVD DL (L1 layer)
Equalizer BOOST value except for DVD DL (L1 layer)
Equalizer FC value of DVD DL (L1 layer)
Equalizer BOOST value of DVD DL (L1 layer)
Data range
0040h~0800h
0040h~0800h
B000h~5000h
B000h~5000h
0040h~0800h
0040h~0800h
0060h~FFA0h
B000h~5000h
FFA0~0060h
9000h~F000h
9000h~F000h
0000h~0004h
0000h~0004h
0000h~0004h
0000h~0004h
18
Standard value
200h
200h
0000h
0000h
200h
200h
0000h
0000h
0000h