Marantz Service Manual error thread

2220B. On the schematic diagram the polarity of the negative rail filtering capacitor (C004) is reversed.
 
On the 2325 schematic it says HE03 and HE04 are HT313272A / 2SC1327ST and HE05 and HE06 are HT107212A / 2SA721ST but HE03 and HE05 are npn transistors while HE04 and HE06 are pnp transistors so the correct data is HE03 and HE05 are HT313272A / 2SC1327ST, HE04 and HE06 are HT107212A / 2SA721ST
 
Marantz 2245
R730 and R731 are listed as 47k in parts list, then listed as 47ohms in schematic.
Check of color bands and resistors on two 2245 phono boards verifies that they are indeed 47 ohms 1/4 watt.
 
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Marantz 2230 schematic error, R755 as per schematic 5.6 kOhms. parts list and pcb shows 3.9 kohms, so right value is 3.9k, as a note, every picture found in the net shows 3.9k


best regards


Pio
 
Marantz 1122DC service manual errors
As noted when working on serial #92U080059

PE01 Tone Control Board:
CE01/02 - manual says 0.47uf but actually 1uf
CE13/14/15/16 - manual says 0.033uf but actually 0.018uf
CE19/20 - manual says 0.47 but actually 0.047uf
CE29/30 - manual says 0.027uf but actually 0.015uf

P400 Phono Amp/Selector:
C403/404 - manual says 10pf but actually 20pf
C405/406 - manual says 6v/33uf but actually 16v/100uf
C411/412 - manual says 20pf but actually 10pf

P700 Main Amp Board:
C701/702 - manual says film but actually ceramic
C715/716 - manual says 100v/22uf but actually 35v/22uf
C717/718 - manual says film but actually ceramic
C719/720 - manual says film but actually ceramic
QT01/02 - manual says 2sc945 but actually 2sc735
QT03/04 - manual says 2sa733 but actually 2sa562
R727/728/729/730 - manual says quarter watt but actually half watt

P850 Power Supply Board:
C853 - manual says 160v/270uf but actually 160v/220uf
R851 - manual says 100 ohm but actually 47 ohm
 
Hi all,

I have converted a 4400 service manual to MS-Word. the purpose here is to be able to check with you all if the approach is worth the effort (took me about a 6 hours using an OCR tool and correcting and enhancing the word document after).
The purpose is to have document which can be enhanced with the corrections (such as the ones in this thread), tips and tricks, ... to the manual. Pictures can be added such as how does an expected signal look on the scope, ....
The document could enhanced in collaborative mode.

I did one, but the thinking that we create a team of volunteers who could work on these.
it took me about 6 hours to get the current result. With the learning and the fact most service manuals are shorter, the exercise should take less time now.
I am looking for a way to upload the document somewhere - any tips. Can't do it in AK it seems.
But I can send via email to anyone who is interested.

Would be great to have your thoughts.

Robin
 
2330B P800 Power Supply and Protection board

Q802 is shown with the base and emitter shorted together.

Q803 is shown with the emitter connected to the base of Q804. It is actually connected through R812, an 18K resistor:



Corrected schematic:
 
The correction for the bias procedure for the 2245 appears to be missing, it was there before I thought.
10mV between pins 754 and 760
 
There are 2 types of 2245, early and late and the procedure is different.
I "think" the only different is which pins to use.
You want to measure across the emitter resistors, so if you can figure out which pins lead to the resistors, you're golden.
 
Do you know if there were any SM update bulletins for the 2245? I have one on the bench now in the early stages and I'd love to make sure I do this one right. BTW, I'm thinking mine is late in the production run with serial #32525 but I'm not sure how they did their numbering back then.
 
The early ones are engraved face.
I think the serial numbers were low, like under 5000.

I don't know of any bulletins.
 
There is a glaring error in the schematics on the 2330B. Note that the left end of R742 and R792 are shown tied to ground, and the right end is tied to the positive power supply rail. Those poor little 10Ω 1/4W resistors wouldn't stand a chance.

As far as I can see, the board only has 46 resistors. Where do you see R792?
 
On the PL01 component locations drawing for the 2325, the polarity for CL14 (which is on the reverse side of the board) is backwards. I just completed restoring that board today and the actual original board agrees with the schematic but not the component drawing. Had me confused for a while.
 
Not sure if this has been mentioned.

2220B
On the P300 MPX Stereo Decoding Board the parts list has C323 and C324 (1uf/35v) as electrolytic but they are tantalum - at least in the unit I have on the bench right now.

Also it lists C325 as 330uf/35v but the one I pulled out was 220uf/35v.
 
Hello, on the 2270 bias voltage manual error, I have two 2270s and have adjusted them to 10 mv per the correction, however they seem to have better performance when set to 5 mv. At 5 mv I can achieve more than half volume without issue. At 10 mv I was getting clipping. at 5 its gone.
 
This is a compilation of errors in Marantz service manuals. These corrections will likely save you from smoking your receiver. Remember to use some good mini grabber leads when you're adjusting bias, I've read way too many horror stories of slipping probes.

Big thanks to Tom (catrafter) for contributing most of these.

2220B Idle current adjust:
SM says measure J712 - 718 for one channel, 713 to 719 for the other. WRONG! Do this instead: Measure bias at J714 to 716 and adjust R733 for 20mVDC on that channel. Then measure J715 to 717 and adjust R734 for 20mV on the other channel.


2220B Cap listing:
Service manual lists CE21 & CE22 as 33 uF/50v. Should be 3.3 uf/50v.
CE23 & CE24 listed as standard 1.0 uF/50V. Use non polar caps here.
C709 and C710 should be 47uf 50V, not the listed 500V.
.

The procedure with regards adjusting the DC offset is also wrong. Adjust it by measuring the voltages at the speakers output.
 
RE: the 2220B......

Just finished an overhaul, and found something interesting on the power amplifier board. At the top of the board there are two green blob diodes at positions H705 and H706. They are on the schematic as such, so no issues there. What isn't on the schematic but was physically found on my unit was an additional pair of green blob diodes, one going from the positive side of H705 to R709, and one going from the positive side of H706 to R710. On both ends, these undocumented diodes share PCB holes with the devices that they bridge. See pic for example:

upload_2017-12-26_11-58-54.png
 
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