My guide to solving problems in the DENON DVD 2900
In this tutorial I will present problems I had over the years in the DENON 2900
And ways solved them.
"from all my mistakes I learned"
Display problems
Typical display problems
1) Display Blinking
2) Display off
3) Display with strong spikes in light
Solutions
Check the connector CX061
pin 3 = 3.3v d3
pin 4 = F+
PIN 5 = F-
PIN 6 = 32V
Display with strong spikes in light or blinking
GU3496-5 LED UNIT Board
check the transistor
TR 102
TR 103
A problem in one of these transistors can cause
Display to flicker.
check the 3 short jumper on GU3496-6
j101
j102
j103
if j103 is open the denon will go to standby
check the rotary 0389007
and clean the rotary switch
audio board unit problem GU3495-1
problems
oscillation
noise
hummmmm
When replacing Op Amps
Always make sure the right treatment with everything around
example
IC216
IC217
on the buffer op amp Cf is 1800P
C341
C342
on op amp ad826
This can cause a problem of oscillation
chenge the caps to cog/npo 22pf
op amp adapter Can cause problems in that it adds capacitance
Solder the Op Amps
Directly to the board
Lowering the resistor values can reduce noise
In the IC 216 IC 216
Gain here 2
denon not use all the gain in the I/V and the comparator op amp
If you change the values of the resistor or cop in the I/V - COMPARTOR which have to calculate all the pieces to the fit input current 7.8m from the dsd1790 .
R*7.8m p/p
(This is not the RMS)
Then calculate the values of capacitors
Fit for the new resistors values.
The problem of loud noise coming from the speakers randomly
When removing the muting transistor
The rest of the muting transistor are still active
Can cause a problem
Way to solve this is to remove the resistor 1.8K- R290
In this way the circuit is completely neutralized
In this tutorial I will present problems I had over the years in the DENON 2900
And ways solved them.
"from all my mistakes I learned"
Display problems
Typical display problems
1) Display Blinking
2) Display off
3) Display with strong spikes in light
Solutions
Check the connector CX061
pin 3 = 3.3v d3
pin 4 = F+
PIN 5 = F-
PIN 6 = 32V
Display with strong spikes in light or blinking
GU3496-5 LED UNIT Board
check the transistor
TR 102
TR 103
A problem in one of these transistors can cause
Display to flicker.
check the 3 short jumper on GU3496-6
j101
j102
j103
if j103 is open the denon will go to standby
check the rotary 0389007
and clean the rotary switch
audio board unit problem GU3495-1
problems
oscillation
noise
hummmmm
When replacing Op Amps
Always make sure the right treatment with everything around
example
IC216
IC217
on the buffer op amp Cf is 1800P
C341
C342
on op amp ad826
This can cause a problem of oscillation
chenge the caps to cog/npo 22pf
op amp adapter Can cause problems in that it adds capacitance
Solder the Op Amps
Directly to the board
Lowering the resistor values can reduce noise
In the IC 216 IC 216
Gain here 2
denon not use all the gain in the I/V and the comparator op amp
If you change the values of the resistor or cop in the I/V - COMPARTOR which have to calculate all the pieces to the fit input current 7.8m from the dsd1790 .
R*7.8m p/p
(This is not the RMS)
Then calculate the values of capacitors
Fit for the new resistors values.
The problem of loud noise coming from the speakers randomly
When removing the muting transistor
The rest of the muting transistor are still active
Can cause a problem
Way to solve this is to remove the resistor 1.8K- R290
In this way the circuit is completely neutralized