What is the DC voltage on the following resistor when the bias pot is at each extreme position?
R1037
R1040
R1029
R1030
R1032
R1037
R1040
R1029
R1030
R1032
I should have used 'across' instead of 'on' when I asked for the voltage on each resistor. Measure the DC voltage directly across each of those resistors.
R1037:0
R1040:0
R1029:0
R1030:0
R1032 :0
Right Channel Bias pot:0
Left Channel Bias Pot:1.05
On the Bias transistors here are the voltages i get
Left Channel
Base:-0.44
Collector:0.50
Emitter:-0.39
Right channel
Base:2.39
Collector:1.53
Emitter:13.12
R1040:0
R1029:0
R1030:0
R1032 :0
Right Channel Bias pot:0
Left Channel Bias Pot:1.05
On the Bias transistors here are the voltages i get
Left Channel
Base:-0.44
Collector:0.50
Emitter:-0.39
Right channel
Base:2.39
Collector:1.53
Emitter:13.12
Lets work with the 1000 series channel for now. I need the voltage across those resistors with the bis pot fully clockwise and with the bias pot fully counter-clockwise.
Are you sure that you have the voltage/pin configuration correct for the bias transistors? The voltage shouldn't be higher on the emitter than on the collector.
Are you sure that you have the voltage/pin configuration correct for the bias transistors? The voltage shouldn't be higher on the emitter than on the collector.
Fully clockwise
R1037:0
R1040:0
R1029:0
R1030:0
R1032:0
Fully counter clockwise
R1037:0
R1040:0
R1029:0
R1030:0
R1032 :0
Theese voltages are with Q1009 and Q1010 lifted
Heres the datasheet i went by for the bias transistors
MUN2111T1 pdf, MUN2111T1 description, MUN2111T1 datasheets, MUN2111T1 view ::: ALLDATASHEET :::
If thats correct pin config heres what i get on the bias transistor
Base:0.40
Emitter:-0.43
Collector:0.47
R1037:0
R1040:0
R1029:0
R1030:0
R1032:0
Fully counter clockwise
R1037:0
R1040:0
R1029:0
R1030:0
R1032 :0
Theese voltages are with Q1009 and Q1010 lifted
Heres the datasheet i went by for the bias transistors
MUN2111T1 pdf, MUN2111T1 description, MUN2111T1 datasheets, MUN2111T1 view ::: ALLDATASHEET :::
If thats correct pin config heres what i get on the bias transistor
Base:0.40
Emitter:-0.43
Collector:0.47
Does 0v mean 0.000v?
What is the DC voltage across pins 1 and 2 (from the pin configuration on the datasheet you posted) for D1006 and D1007?
What is the DC voltage across pins 1 and 2 (from the pin configuration on the datasheet you posted) for D1006 and D1007?
Lift Q2009 and Q2010 in the other channel and confirm that you read 0.000v across all corresponding resistors in that channel and confirm that you have essentially 0v across the speaker terminals for the 2000 series channel.
Lifted Q2009 and Q2010 and get 0.000 volts acros all the 2000 series resistors as well..
I get 0.02 volts across the speaker terminals
I get 0.02 volts across the speaker terminals
I replaced the LM317 and The LM337 and it stopped burning the resistors..
The crazy thing about this amp is If i lay my finger across the board around the Q1000 all th way to Q1005 I can get the distortion to go away and output is clean
If i do the same for the 2000 series parts that channel also has clean output as soon as i remove my finger from the board the distortion comes back..
I removed all the components in that area (1000 series parts) cleaned the board and resolderd everything still distorts until i lay my finger across the board..
If i try to bridge the amp Left + right - i get very lil output almost no output at all
The crazy thing about this amp is If i lay my finger across the board around the Q1000 all th way to Q1005 I can get the distortion to go away and output is clean
If i do the same for the 2000 series parts that channel also has clean output as soon as i remove my finger from the board the distortion comes back..
I removed all the components in that area (1000 series parts) cleaned the board and resolderd everything still distorts until i lay my finger across the board..
If i try to bridge the amp Left + right - i get very lil output almost no output at all
I'm assuming that you tried this previously (not recently where Q1009, Q1010, D1002-2005 are supposed to be out of the board).
I'm stumped for now. You've verified that all of the various supplies are present and it appears that you've checked all components in the channel. Generally, when both channels are affected, the problem is a power supply or control issue.
email me.
babin_perry@yahoo.com
email me.
babin_perry@yahoo.com
- Status
- Not open for further replies.