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OT-Marantz 2216 Receiver Amp Board Schematic/Troubleshooting Advice
I realize that this is ot, but I also recognize that there is also a
wealth of vintage audio technical talent that reads and posts to this ng. I need the schematic for a Marantz 2216 Receiver (P700 Main Amp) board, and could use any and all troubleshooting advice. This Main Amp board possibly could be common to other Marantz receivers, such as the 2216B, 2218, or ??? Or possibly used in some integrated receivers ??? (some of you experienced Marantz gurus might know which ones) This amplifier board uses four Sanyo transistors: 2-D313; and 2-B507. ------ Here is what I know thus far about this receiver: I traded for this receiver knowing that it had no sound output. (other than that, I know nothing more of the history of it) The front end works as it should, am fm etc., However, there is absolutely no sound coming from the speaker outputs. The rf signal is reaching the P700 Main Amp board. The P700 Main Amp board is receiving 52vdc from the P800 Power supply board. All indications are (at least to me) that the problem is in the P700 Main Amp Board. Though this is not a high wattage receiver, it is really clean, and might be worthy of repair. If anyone has any troubleshooting advice or comments, I could certainly use the help. Many thanks for you help, Mark |
#3
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You could look at 2215 and 2215B which are he
http://dummyload.com/marantz/index.html MANY MANY THANKS TOM!!! It appears that the 2216 uses the same amp board as the 2215B. A bit of a mystery though: There are four in-line diodes hand-soldered to the back side of the board. BUT, it appears that every transistor (in at least one channel) is shorted. Given my lack of soldering expertise, this repair may have to wait until I am more "soldering proficient" Thanks again, Mark |
#4
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"Marc" wrote in message om... I realize that this is ot, but I also recognize that there is also a wealth of vintage audio technical talent that reads and posts to this ng. I need the schematic for a Marantz 2216 Receiver (P700 Main Amp) board, and could use any and all troubleshooting advice. This Main Amp board possibly could be common to other Marantz receivers, such as the 2216B, 2218, or ??? **Nope. They're all different. The 2216 was capacitor coupled, whilst the 2216B and 2218 were both direct coupled (ie: split rails). Or possibly used in some integrated receivers ??? **Huh? (some of you experienced Marantz gurus might know which ones) This amplifier board uses four Sanyo transistors: 2-D313; and 2-B507. **Yep. Replace 'em. Unreliable things they were. TIP series devices should work fine. ------ Here is what I know thus far about this receiver: I traded for this receiver knowing that it had no sound output. (other than that, I know nothing more of the history of it) The front end works as it should, am fm etc., However, there is absolutely no sound coming from the speaker outputs. The rf signal is reaching the P700 Main Amp board. The P700 Main Amp board is receiving 52vdc from the P800 Power supply board. All indications are (at least to me) that the problem is in the P700 Main Amp Board. **A reasonable guess. Though this is not a high wattage receiver, it is really clean, and might be worthy of repair. If anyone has any troubleshooting advice or comments, I could certainly use the help. **Just measure the Voltages at the Emitters of the output transistors. It should be close to 1/2 the rail Volts. The channel which is faulty, will likely show something different. I'd suggest replacing outputs, drivers and Emitter resistors, just on spec. Then check all the other semis in the output stages. Being capacitor coupled, the thing is easy to fault find. -- Trevor Wilson www.rageaudio.com.au |
#5
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This Main Amp board possibly could be common to other Marantz
receivers, such as the 2216B, 2218, or ??? **Nope. They're all different. The 2216 was capacitor coupled, whilst the 2216B and 2218 were both direct coupled (ie: split rails). Hi Trevor, thank you for your input. My above comment about "commonality" was based on a "modular" hunch. I spent many years designing electro-mechanical packaging, and most everything electro-mechanical is designed using "modular" concepts...revision numbers, etc. Manufacturers are constantly searching for methods to reduce engineering and manufacturing cost by using as many common parts as possible on as many models as possible. And possibly this hunch paid off... By following the link above, provided by Tom Bavis, it appears that the schematic listed for the 2215B is the same schematic. Granted, I have not checked each and every component on the board, but it "appears" that it is the same schematic. If you have a minute, please take a look at it and possibly, given your Marantz experience, can discern any differences. The four in-line diodes that are hand-soldered to the back side of the board are still a bit of a mystery, though... Thanks again, Mark http://dummyload.com/marantz/M2000_2...5B%20SCHEM.jpg Or possibly used in some integrated receivers ??? **Huh? I meant to say, "integrated amps"... (some of you experienced Marantz gurus might know which ones) This amplifier board uses four Sanyo transistors: 2-D313; and 2-B507. **Yep. Replace 'em. Unreliable things they were. TIP series devices should work fine. ------ Here is what I know thus far about this receiver: I traded for this receiver knowing that it had no sound output. (other than that, I know nothing more of the history of it) The front end works as it should, am fm etc., However, there is absolutely no sound coming from the speaker outputs. The rf signal is reaching the P700 Main Amp board. The P700 Main Amp board is receiving 52vdc from the P800 Power supply board. All indications are (at least to me) that the problem is in the P700 Main Amp Board. **A reasonable guess. Though this is not a high wattage receiver, it is really clean, and might be worthy of repair. If anyone has any troubleshooting advice or comments, I could certainly use the help. **Just measure the Voltages at the Emitters of the output transistors. It should be close to 1/2 the rail Volts. The channel which is faulty, will likely show something different. I'd suggest replacing outputs, drivers and Emitter resistors, just on spec. Then check all the other semis in the output stages. Being capacitor coupled, the thing is easy to fault find. |
#6
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"Marc" wrote in message om... This Main Amp board possibly could be common to other Marantz receivers, such as the 2216B, 2218, or ??? **Nope. They're all different. The 2216 was capacitor coupled, whilst the 2216B and 2218 were both direct coupled (ie: split rails). Hi Trevor, thank you for your input. My above comment about "commonality" was based on a "modular" hunch. I spent many years designing electro-mechanical packaging, and most everything electro-mechanical is designed using "modular" concepts...revision numbers, etc. Manufacturers are constantly searching for methods to reduce engineering and manufacturing cost by using as many common parts as possible on as many models as possible. And possibly this hunch paid off... By following the link above, provided by Tom Bavis, it appears that the schematic listed for the 2215B is the same schematic. Granted, I have not checked each and every component on the board, but it "appears" that it is the same schematic. If you have a minute, please take a look at it and possibly, given your Marantz experience, can discern any differences. The four in-line diodes that are hand-soldered to the back side of the board are still a bit of a mystery, though... Thanks again, Mark http://dummyload.com/marantz/M2000_2...5B%20SCHEM.jpg Or possibly used in some integrated receivers ??? **Huh? I meant to say, "integrated amps"... (some of you experienced Marantz gurus might know which ones) This amplifier board uses four Sanyo transistors: 2-D313; and 2-B507. **Yep. Replace 'em. Unreliable things they were. TIP series devices should work fine. ------ Here is what I know thus far about this receiver: I traded for this receiver knowing that it had no sound output. (other than that, I know nothing more of the history of it) The front end works as it should, am fm etc., However, there is absolutely no sound coming from the speaker outputs. The rf signal is reaching the P700 Main Amp board. The P700 Main Amp board is receiving 52vdc from the P800 Power supply board. All indications are (at least to me) that the problem is in the P700 Main Amp Board. **A reasonable guess. Though this is not a high wattage receiver, it is really clean, and might be worthy of repair. If anyone has any troubleshooting advice or comments, I could certainly use the help. **Just measure the Voltages at the Emitters of the output transistors. It should be close to 1/2 the rail Volts. The channel which is faulty, will likely show something different. I'd suggest replacing outputs, drivers and Emitter resistors, just on spec. Then check all the other semis in the output stages. Being capacitor coupled, the thing is easy to fault find. |
#7
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Say what?
"Trevor Wilson" wrote in message ... "Marc" wrote in message om... This Main Amp board possibly could be common to other Marantz receivers, such as the 2216B, 2218, or ??? **Nope. They're all different. The 2216 was capacitor coupled, whilst the 2216B and 2218 were both direct coupled (ie: split rails). Hi Trevor, thank you for your input. My above comment about "commonality" was based on a "modular" hunch. I spent many years designing electro-mechanical packaging, and most everything electro-mechanical is designed using "modular" concepts...revision numbers, etc. Manufacturers are constantly searching for methods to reduce engineering and manufacturing cost by using as many common parts as possible on as many models as possible. And possibly this hunch paid off... By following the link above, provided by Tom Bavis, it appears that the schematic listed for the 2215B is the same schematic. Granted, I have not checked each and every component on the board, but it "appears" that it is the same schematic. If you have a minute, please take a look at it and possibly, given your Marantz experience, can discern any differences. The four in-line diodes that are hand-soldered to the back side of the board are still a bit of a mystery, though... Thanks again, Mark http://dummyload.com/marantz/M2000_2...5B%20SCHEM.jpg Or possibly used in some integrated receivers ??? **Huh? I meant to say, "integrated amps"... (some of you experienced Marantz gurus might know which ones) This amplifier board uses four Sanyo transistors: 2-D313; and 2-B507. **Yep. Replace 'em. Unreliable things they were. TIP series devices should work fine. ------ Here is what I know thus far about this receiver: I traded for this receiver knowing that it had no sound output. (other than that, I know nothing more of the history of it) The front end works as it should, am fm etc., However, there is absolutely no sound coming from the speaker outputs. The rf signal is reaching the P700 Main Amp board. The P700 Main Amp board is receiving 52vdc from the P800 Power supply board. All indications are (at least to me) that the problem is in the P700 Main Amp Board. **A reasonable guess. Though this is not a high wattage receiver, it is really clean, and might be worthy of repair. If anyone has any troubleshooting advice or comments, I could certainly use the help. **Just measure the Voltages at the Emitters of the output transistors. It should be close to 1/2 the rail Volts. The channel which is faulty, will likely show something different. I'd suggest replacing outputs, drivers and Emitter resistors, just on spec. Then check all the other semis in the output stages. Being capacitor coupled, the thing is easy to fault find. |
#8
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"Marc" wrote in message om... This Main Amp board possibly could be common to other Marantz receivers, such as the 2216B, 2218, or ??? **Nope. They're all different. The 2216 was capacitor coupled, whilst the 2216B and 2218 were both direct coupled (ie: split rails). Hi Trevor, thank you for your input. My above comment about "commonality" was based on a "modular" hunch. I spent many years designing electro-mechanical packaging, and most everything electro-mechanical is designed using "modular" concepts...revision numbers, etc. **A thought which did work with many old Marantz models. Not all, however. Manufacturers are constantly searching for methods to reduce engineering and manufacturing cost by using as many common parts as possible on as many models as possible. And possibly this hunch paid off... By following the link above, provided by Tom Bavis, it appears that the schematic listed for the 2215B is the same schematic. Granted, I have not checked each and every component on the board, but it "appears" that it is the same schematic. **Yep. It is VERY close. If you have a minute, please take a look at it and possibly, given your Marantz experience, can discern any differences. **Nothing substantial. The four in-line diodes that are hand-soldered to the back side of the board are still a bit of a mystery, though... **Yep. I can see no reference in my service manual. A mod, I'd say. Thanks again, Mark http://dummyload.com/marantz/M2000_2...5B%20SCHEM.jpg Or possibly used in some integrated receivers ??? **Huh? I meant to say, "integrated amps"... **Ah. -- Trevor Wilson www.rageaudio.com.au |
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