Marantz Service Manual error thread

[rBuckner]

Marantz 2500

I found a few problems.

FM stereo separation adjustment: Mentions test point J238, it's really J236.

There's no mention of how to adjust the two FM scope functions' horizontal centering. It is pot RR52 on the RR50 board (which is labelled "PR50" on page 23!). This is the funny little plug in board at the right back end of the switch board. Basically it is just behind the left end of the tuner dial housing.

The tuner front end in the unit I worked on had different values as listed below:
R102 shown as 12K but is 120K
R101 shown as 47K but is 47 ohms (this one may be a mistake!)
R103 shown as 47K but is 470K
R104 shown as 22K but is 220K

For reference this tuner had an AGC voltage of about 2.5Vdc for most stations and went down to maybe a 0.2-0.3 for the very strongest stations.

No pc board polarity errors on polarized caps were found.

 

[mcsew2k]

4140:

The rectifier circuits for the output meters are shown incorrectly in the schematic. The illustration for the PCB on which these circuits are mounted is correct. This has been verified by inspection of an actual 4140. A corrected schematic for the affected circuits is attached.

Edit: The schematic for the 4100 (attached) appears to agree with the proposed corrections.

 

[Macdude]

2325 Headphone Jack wiring in Schematic

Not sure if this was mentioned yet, but the 2325 headphone connections in the schematic appear to be wrong. The schematic shows JU17 connecting to ground, when, in reality, it is JU19 that should be grounded. JU17 and JU18 are the actual signal to the headphones. I tried to follow this while replacing a broken jack and it didn't work out to well after following the schematic.

I'd appreciate it if someone could verify to make sure I'm not nuts.

 

[mcsew2k]

Yes, looks like an error in the schematic. If you have verified that the post numbering is correct on the board, then JU17 should be the right channel signal and JU19 should be ground. I attached images of the erroneous and corrected areas.

I also corrected the spelling of "REMOTE" for the speaker terminal labeling.:scratch2:

 

[mcsew2k]

2270:

There is a misplaced resistor (R612) in the hi-filter circuit circled in red. Error corrected in the following image.

I have not looked inside my 2270 to see if R612 is on a PCB or somehow wired directly to the high filter switch.

 

[tonebells]

2215B r741/742

2215B

P700 Main Amp

SM has R741/R742 as 22r 1/2w

Schematic has 2.2r

My board has 220r 1/2w

On phono board C401/C402 in SM are listed as 33uf 25v board had 3.3uf 25v.

 

[c.coyle]

2230

2230 Service Manual:

The parts list incorrectly identifies H005 and H006, the power amp heatsink diodes/varistors, as SU-3A. Correct designation is SV-3A.

 

[Denten]

2385 Idle current adjustment

Hi all, I want to confirm this before I proceed.
2385 Idle current adjustment according to the manual I connect a vtvm between pin terminals J719 and J729 and adjust R747 so the meter reads 25mv.
Is this correct?

 

[jcolletteiii]

2250 Service manual - only found one so far, but I suspect one more at least. P-700 amp boards: C704 cap is 50V 47uF, not 50V 4.7uF.

 

[violetvinyl]

A few discrepancies that I found:
C803 SM says 470uf 50V on the board is 470uf 63V
C809 SM says 1000uf 10V on the board is 1000uf 16V
CE21 SM says 33uf 50V on the board is 3.3uf 50V
CE22 SM says 33uf 50V on the board is 3.3uf 50V
C164 SM says 4.7uf 35v on the board is 22uf 10V
Relay SM says LY2 on the board is an MY2

Regarding the 2252:
I just did some recapping on this one and i did notice the 1000uf 10/16v discrepancy and used a 16v. However, i have some clipping now and i wonder if the 470uf 50v instead of 63v is enough of a difference to cause the problem i am having. Any thoughts?

 

[orrt2010]

2238b

I'm pretty sure C701's polarity is backwards on the silkscreen.

 

[mcsew2k]

2216

I found some issues in the SM:
2216:

C121 is 0.22uF/35V in the schematic, but listed as 0.022uF/35V in the Parts List. The part number in the parts list matches other 0.22uF/35V caps in the same parts list so it seems to be a simple typo. It is a tantalum cap and I am not sure what is actually in the unit, but I am betting that it is a 0.22uF/35V. Edit: Original cap is verified to be a 0.22uF/35V.

C140 polarity is not marked on the PCB silkscreen. The schematic shows the negative in common with R144 and R146 which is correct. (Does the "A" mean something?)

C803 is 4700uF/55V in the schematic and parts list, but my unit actually has a 3300uF/55V.

C808 is 220uF/50V in the schematic, but listed as 100uF/50V in the Parts List. The actual cap in my unit is 100uF/50V.

These are all the issues I found during a full recap.

 

[ConradH]

Marantz 2275 built in 1977- the power amp boards are slightly different than the commonly available manual & schematic show.

H710 is listed as a varistor (S3016R), part of the Vbe bias network. It isn't a varistor. It's a single silicon diode with a forward drop of 0.60 VDC @ 1 mA @ cool (61F) room temperature. It should be tucked under the heat sink of H713.

H719 isn't listed at all. It is a varistor (thermistor) with a resistance of 1230 ohms at 68F and 585 ohms at 100F. It should be easy to locate a replacement from those numbers, if necessary. I wouldn't try to replace it with diodes. It's in series with R747, also not listed, an 82 ohm resistor. The pair appears to be connected between the collectors of H711 and H712, also in parallel with the Vbe multiplier. The varistor rests against the heat sink of H711. Sort of a belt and suspenders means of thermal control. If you measure resistance between the collectors of H711 and H712 with a meter that doesn't turn on junctions (most modern DVMs not on diode check), you should see about 1500 ohms.

The power amps boards on this unit are YD2917003-5.

The 2275 FM alignment instructions are what appear to be the generic Marantz alignment instructions common to most of their similar FM front ends. IMO, the wording is confusing. They tell you to adjust the RF stages for lowest distortion, which wouldn't be possible at the low levels needed for good RF alignment, because the analyzer would read mostly noise. Nor can you reduce the RF signal level to the point where the audio levels decreases with the RF level- this is FM; it doesn't work that way- the signal just gets noisy. The RF stages should probably be peaked first, using as low a signal level as you can. Just adjust them for maximum on the signal strength meter. After that, touch up the distortion at a bit higher signal level using the same adjustments. BTW, you should install a short horizontal wire on the 19 kHz test point so you can clip a probe on it with the metal shield still in place.

The Marantz 2230 FM alignment instructions appear to be a bit off. On step 7 they say to measure J504, but it's under the discriminator cover. Go to the muting board right behind and use J564 instead- it's the same wire and right out in the open. Grab any handy ground, say J552. Next, in that same step, the discriminator has an offset and shouldn't be set to zero. The correct voltage appears to be 0.360 VDC, both for the no signal condition and center tuning. There may be slight variation unit to unit. For the separation adjustments one can probably ignore the subchannel peaking and just peak it on the regular stereo signal in the next sentence. The rest of the instructions seem to work fine. Thanks to catrafter for helping me sort this. Nowhere have I found instructions for adjusting the CN cap (often C103) that feeds back to the input of the single-gate front ends.

Do your AM alignment during the day when there's less external signal interference. Watch out for LED and CFL lighting, as they can generate a huge amount of background noise. If you sweep the AM IF, you have to do it quite slowly to see the true shape, just a couple Hz, or remove a filtering cap.

 

[mcsew2k]

2226:

The front panel pushbutton controls are shown in the schematic as ganged switches, when of course they are separate switches.

Note: Starting on a recap so I will edit with errors as I find them.

Edit: I completed the recap and found no erroneous values or polarities in the schematic or parts list.

 

[Thingfisher]

I noticed this huge white resistor doesn't show up on Figure 18 of the 2230 Service Manual (showing the component locations on P800). On my unit, it hovers over H804.

 

[mcsew2k]

I noticed this huge white resistor doesn't show up on Figure 18 of the 2230 Service Manual (showing the component locations on P800). On my unit, it hovers over H804.

I believe that is R018 which is shown in the schematic to be mounted on a terminal strip, although in your case it is not.

 

[patfont]

Yes 150 ohm 5W. And is ok leave it be on the 2230.

 

[hirscwi]

I have a correction for the schematic for the Tone amp board used in many early 22xx receivers and integrated amps. Usually it's PCB400 but can have a couple other numbering schemes. I have seen the same board used in 1060, 2230, 2245, and 2270 and I bet it used in others (2225?).

H403, 404, 407 & 408 are shown as PNP transistors on the schematic, and I know that KSA992 (a PNP transistor) works as a replacement. But the schematic lists these transistors as 2SC493. I thought the "2SC" designation indicates an NPN transistor (according to the JIS specification) so I believe the correct transistor should be 2SA493. And the KSA992 is a working replacement.
__________________

 

[blhagstrom]

This is marked backwards on the board's silkscreen and in the manual. The schematic is correct.

VERIFIED ON THE ONE I JUST DID.

Also, CE01 and CE02 are not labeled on the board (+). Negative goes to the short end (closest?) end of the board.

 

[tulkas]

2235 (not B) SM Errors

I found the following while recapping a 2235 (not B):

2235 SM Capacitor errors:

C307 listed as standard 0.47 uF/50v. Use non-polar caps here.
C308 & C309 listed as standard 0.22 uF/50v. Use non-polar caps here.


CE21 & CE22 listed as 33 uF/50v. Should be 3.3 uf/50v.
CE23 & CE24 listed as standard 1.0 uF/50V. Use non-polar caps here.

Note: The non-polar capacitors are shown correctly in component diagram, just not listed as non-polar in parts list.