Discussion in 'Marantz Audio' started by Jailtime, Jun 16, 2011.
Brownmule, welcome, you need to start a new thread in the Marantz forum.
2270 Bias Diode H761 polarity.
I can't find any other references to validate. My SM schematic and diagram both show the negative connecting to the H760 Collector pin trace. The silkscreen on the board is reversed (neg towards edge of board).
Having skimmed through all 6 pages, I need to rip this thing apart (again) and correct a few cap polarities, as I just dropped them all in according to the silkscreens.
There are differences in the 2245.
I have an engraved face one here.
The service manual in the AK DB has the right adjustment instructions, contrary to the corrections in the OP, but the schematics and board diagrams don't match.
From what I gather, the engraved face were built during the "learning" phase at Superscope and I guess there could be variations.
Unfortunately, I forgot to gather more info when I had the amp apart.
2270 750 Board Diagram
Found another one; the diagram (not schematic) shows the H758 and H759 Base and Emitters reversed. This gave me much hairpullingoutness until I looked around at all the other transistor pinouts and re-tested with standard B and E.
Edited original post to remove 2245 idle current adjust. Since it appears there are differences in the 2245 run.
Not sure if this is an issue but the unit I've purchased had a different value for the C807 on power supply. Schematic says value should be 10 uf/50v mine had a 4.7uf installed. A couple of other caps were blown on the board,I am not sure if all of them were original or someone did something at one point in time.
Marantz 2220B - Output transistors
The manual shows H001 - H004 (D188M) as orienting to the upper part of the heat sink, and H002 - H003(A627) as orienting towards the lower part of the heat sink, which the reverse of my 2220B. I happened upon this while sorting through my manual. I realize that most people can take the time to remember the direction of their outputs, but it is an error nonetheless.
The service manual says to adjust trim pots R739 and R740 to obtain zero voltage across "JN01 and JN05 (or ground)" and "JN04 and JN06 (or ground)," respectively.
Unfortunately, adjusting R739 and R740 has no effect on these voltages, and furthermore JN05 and JN06 are NOT at ground. The correct way to adjust the offset is to use R739 and R740 to zero the voltage across the left and right speaker outputs.
The description of the Indicator/Relay board (PN00) in the 1180DC service manual is totally screwed up. There is a spliced-in correction, showing that the orientation of QN08 is backward on the original schematic.
Also, the parts list does not match the parts shown on the schematic. The schematic says that QN19 - QN22 are all transistors while the parts list says they are diodes (blue in the figure below). Similarly, QN11 - QN14 are shown as diodes in the schematic but listed as transistors on the parts list (red in the figure below). I haven't checked to see whether these two sets of part numbers were simply switched.
Finally, looking closely at the schematic it appears that whoever drew it flipped the template backward for some of the transistors. The flat side of the transistor is pointing the right way (based on my inspection of the actual board) but the letters "E" and "B" are drawn backwards and sometimes label the wrong terminals.
Just noticed that the service manual on the 4140 quad integrated amp has problems on the P600 amp board schematics. Best use the 4100 power amp schematics.
4140 - Wrong: ................................................................................................................4100 - Right:
1060 P800 board
The service manual, also Figure 15, and also the schematic show pin J808 connected to the ground plane on the P800 board.
I do not believe this is correct.
On 1060 S/N 19085, J808 has 7.27vac on the pin, is not connected to ground, and feeds the power on indicator bulb with 7.27vac with a small white wire.
The other white wire from the bulb is connected to J805 which is ground as depicted.
The larger green wire connected to J808 comes from the transformer, which I assume is a low voltage winding to the power on indicator bulb.
Also pin J804 Is not depicted in Figure 15, but is depicted on the schematic.
On S/N 19085 J804 is connected to the chassis by a strap. The schematic shows J804 connected to pin J704 on the P700 board.
Looking into this a bit further, it seems that there are at least (2) different versions of the P800 board installed in the 1060. The service manual in the AK database shows the P800 board to be
part# YD2828004-0, the board installed in S/N 19085 is a different board, part# YD2828005-0.
The difference appears to be that the 8005-0 board has pin J808 separated from the ground plane on the board and is an island connected to nothing else on the board. It seems to be used as a connection point from the green wire coming from the transformer and the white wire going to the power on indicator bulb.
The part #s can be read from the bottem of the P800 boards, so you can check to see which board you have. Also if you have 7-8 volts ac on the J808 pin to ground, you probably have the later board.
Marantz 2230 C754 polarity marking
The C754 polarity marking is backwards on some 2230 P750 boards. The service manual schematic is correct.
The picture with the green arrow shows the correct polarity marking, the one with the red arrow is marked incorrectly.
Model Twenty Six Manual - Anyone have a copy to share ? Looking for the version with 0.5 Ohm 2 Watt emitter resistors on the Amp Board. I don't see a copy of that version on the Database.
Confirmed. The SM IS wrong!
IDLE IS R727
Offset IS R726
They are backward in the manual
Marantz 2252B P700 component locations
There are two Q718 transistors shown on the P700 component diagram.
The one furthest from the relay is actually Q715
First posting.... hope I did it right.
Thanks to all
I picked up a very clean 2240 this weekend. Doesn't seem to be much mention of that model here (reasons?) but was checking voltage, DC offset and idle current and ran into something in the SM that looks incorrect. In Section 16: Audio Adjustment, Line 4, it says: "Check DC offset voltage aligned in the procedure 2 and if any DC output is observed on the DC voltmeter, adjust the R762 again for "zero" output." Problem is I can't find an R762 adjustment point. Are they referring to R707 used for the initial adjustment? Should this be added to the Corrections list?
2230 FM Tuner Alignment
The SM Calls for 0 VDC Discriminator Adjustment, which from personal experience does not work very well at all. Found this post on the Yahoo FM Tuners Group works far better:
> In some units (2230) the discriminator is biased off by
> about 0.36 VDC. Adjusting the output for 0 VDC on noise results in a
> terrible alignment. Adjusting for 0.36 VDC and also using that same
> number to indicate centered tuning works fine. (this is for units with
> no built-in tuning meter).
Marantz 2220B serial number #U353553
PH01 Filter Board. Schematic and parts listing do not show CH05/CH06 but I'm clearly looking at these little blue tantalum caps. The 2230B service manual does show these caps so maybe Marantz switched boards at some point in production. Installation looks factory original.
This board is sandwiched between the function switch and the tuning meter so it's likely many have missed it. Will be replacing the factory 0.22uf 35v tantalums with OOP Panasonic stacked films I have on hand, but any film would work.
EDIT: Confirmed the board markings are YD2915109 which match the 2230B service manual. The 2220B manual lists this board as YD2915005. Definitely seems like a substitution at the factory.
Marantz 2220B serial number #U353553
One more for the 2220B. This time on P800 power board. The board diagram and parts list in the service manual show H803 as DS-131B and H804 as DS-132B dual diodes. These positions should actually be reversed, as H803 is DS-132B and H804 is DS-131B. This is also confirmed in the schematic which doesn't list the part numbers but does show the proper positions for these common cathode and common anode dual diodes.
Separate names with a comma.