RX V1600 Yamaha Surround Sound Reciever - Page 1
Forum section: electronics / beginners

author: Farb
author_rank: Contributor
timestamp: April 16, 2013, 09:23:01 am
content: Hello yall!I watched the videoblog about the yamaha repair.I have a V1600 which starts up and shuts down quickly, when I enter diagnostics mode I get PS-PRT255 as errorcode which means overvoltage."Cause: The voltage in the power supply section isabnormal.Supplementary information: The abnormal voltage isdisplayed in based on 5V as 255."Anyone that has had a similar issue that could guide me to a solution or possible the component that is common?

author: David_AVD
author_rank: Super Contributor
timestamp: April 16, 2013, 09:47:09 am
content: I don't know anything about that specific model but...First thing to do is pop the lid off it (unplug it first!) and check for anything that looks amiss such as connectors not seated or burnt components.Next, check for cracked solder joints on PCB connectors and any of the heavier components.After that, you may need a service manual to start checking voltages and see what that error code is really referring to.

author: Farb
author_rank: Contributor
timestamp: April 16, 2013, 09:52:04 am
content: Thanks for the fast reply!I've opened it up and removed the PS card. I can't find any busted components/soldering.I found a service manual for my model but I can't seem to find any specific pointers about the issue only"Cause: The voltage in the power supply section isabnormal.Supplementary information: The abnormal voltage isdisplayed in based on 5V as 255."If you had some time over to have a look at it I would be forever grateful!Servicemanualhttp://elektrotanya.com/yamaha_rx-v1600_ax-v1600_sm.pdf/download.html

author: David_AVD
author_rank: Super Contributor
timestamp: April 16, 2013, 09:56:14 am
content: Your next step is to carefully measure the various voltages in the power supply and compare them to the ones marked in the schematic diagram.

author: Farb
author_rank: Contributor
timestamp: April 16, 2013, 10:16:50 am
content: Ah! found it. Will work on it tonight!.Thanks for bringing this slowminded newbie a step further:)

author: David_AVD
author_rank: Super Contributor
timestamp: April 16, 2013, 11:58:17 pm
content: The weird voltages on the fan terminals could be due to a cracked 0V connection elsewhere. You do have everything plugged in while measuring the voltages don't you?With some hi-fi amplifiers many of the 0V connections are made only using the mounting screws. If you run them with boards not properly screwed in, all hell breaks loose.EDIT: Your last post vanished while I was typing my reply.

author: Farb
author_rank: Contributor
timestamp: April 17, 2013, 12:04:44 am
content: Yeah I removed it cause I think I made a fool of myself and did it wrong.I got it all in place and hooked up (I'm well aware of safety specs) just to try out the /RES and +5M pins to see if they are infact correct accordingly to the schematics.0V connection = GND or what do you mean?EDIT: Page 105 "POWER 2" sectionW1EDIT2: Should I measure when the cable is connected or power up DIAG mode and measure? I've only measured while "standby"

author: David_AVD
author_rank: Super Contributor
timestamp: April 17, 2013, 01:33:54 am
content: You will need to measure some of the voltages when it's fully powered up if they are the ones in question.0V = "ground" = "earth" in the context of this discussion.Make sure you're measuring the voltages from a known 0V point on the board.I see that your unit has the same capacitor feed standby supply as the one in Dave's video. I'd probably check its capacitance and replace (if needed) before going any further.

author: Farb
author_rank: Contributor
timestamp: April 17, 2013, 04:22:53 pm
content: I've checked C4 "223K" which should be 22nF and I get 21nF with my Fluke 113 and that should be fairly ok.But I might have found something on C9. On the schematics it should give 6.9AC and I get 0AC. I've removed the component to read out what values it gives me and it provides 10-11nF. This C9 should give me 5pF accordingly to the part list. Could this be something?

author: David_AVD
author_rank: Super Contributor
timestamp: April 17, 2013, 10:41:26 pm
content: That 6.9Vac is the secondary of that transformer. My guess is that there's no mains voltage on the primary of it and that's controlled by that weird circuit just to the left. C9 says 0.01/100 on the diagram so that's 10nf (correct).Make sure you have some DC voltage on pin 14 of IC3 (TCL4013BP). If not, you may have a faulty component around that area.I just checked the records of similar repairs here and re-soldering cracked joints features a fair bit.

author: Farb
author_rank: Contributor
timestamp: April 18, 2013, 09:13:10 am
content: Ok I will try that.I did some measures last night and from D11 (AC to DC convert) it should measure 9,3 and I get 9.3-9.5 so that should be good.On page 105. section W1 (FUNCTION (1))You see the /LFAN to /RES connector.I get good reads on all except /RES and PDET which should be around 5v I get 0.1 or 0 on them and they should get that voltage from another PCB.Some extra information:I was able to get into DIAG mode without spasm LCD and see that AD CHECK says thatPS1 is 255PS2 around 60-70DC is around 50And according to the manual PG.41PS1:76 to 106PS2: 62 to 97DC Normal value: 3 to 33(PS1: Detects ±B1, ±B2, ±B4, ±B5, ±12V, +5D1, +5D2,+5V2, +5V3, +5VBUS (U, C models) and +2.5D.PS2: Detects +9V, ±5V and +7V)Just thought that this could give some ideas.I will check that point you mentioned tonight.

author: David_AVD
author_rank: Super Contributor
timestamp: April 18, 2013, 09:19:30 am
content: Diagnosing repairs remotely (like this) is difficult. The basis of any repair is to check things from one end to the other, comparing voltages, component values, etc to the circuit (if available) or what you figure they should be.

author: Farb
author_rank: Contributor
timestamp: April 18, 2013, 09:25:36 am
content: Yes I understand.I will proceed on checking and I hope to god that it is something replaceable on this PS card and not one of the other more "hidden" cards.

author: Farb
author_rank: Contributor
timestamp: April 18, 2013, 05:41:45 pm
content: On IC3 pin 14 I read 0.1 AC not DC

author: Farb
author_rank: Contributor
timestamp: April 18, 2013, 10:17:05 pm
content: I think I made some kind of progress...I took out one of the PCBs which I suspected had issues. And it looked like it had gotten hot before cause of strange solders. I removed the components and resoldered them and got everything in place. Now my error code gives me PS-PRT 120 instead of 255 and when checking DC it stays on 22 (3-33 normal) and PS1-115-120.This is one of the many PCBs which is seated against the heatsink with 5-6 "Sharp" voltage regulators (IC PQ05RD11 in manual)I only "repaired" the solder on the first 3 but this could be one issue.And while in DIAG mode I tried to play some sound to the speakers/headphones but I can only hear silent "humming".I thought I should post this as it felt like I did something right:)EDIT: Page 105 (POWER 5) IC4 is one the regulators

author: David_AVD
author_rank: Super Contributor
timestamp: April 18, 2013, 10:19:51 pm
content: Like I said before, cracked solder joints are the cause of many faults in hi-fi (and other) equipment.It's quite possible that diag mode mutes the audio output.

author: Jasmine
author_rank: Newbie
timestamp: April 19, 2013, 05:17:41 am
content: what's the bandwidth?how many wave form?

author: David_AVD
author_rank: Super Contributor
timestamp: April 19, 2013, 05:37:49 am
content: Quote from: Jasmine on April 19, 2013, 05:17:41 am

author: Farb
author_rank: Contributor
timestamp: April 19, 2013, 08:18:10 am
content: Quote from: Jasmine on April 19, 2013, 05:17:41 amHow do I measure that?By the way the ICs I resoldered seemed to have good enough connection as I tested them as they were. There was only some oxidizing solderjoints. But maybe I should remove the rest of them and see if this helps the problem and this time try to measure them aswell.

author: Farb
author_rank: Contributor
timestamp: April 22, 2013, 07:20:46 pm
content: Here is some "good" news. On Power(5) Q15 Transistor I should be able to read out -12V. But I get 0.9V it might be to early to celebrate but I think this could be my enemy.I got some information about the errorcode and the reply was that if PS-PRT is high it's usually negative voltage that is either missing or low.

author: David_AVD
author_rank: Super Contributor
timestamp: April 22, 2013, 09:17:02 pm
content: Looking for missing / incorrect voltages and tracking down the reason is the key. A missing voltage (faulty transistor / regulator pr cracked joints) in the power supply can cause all sorts of knock-on effects.

author: Farb
author_rank: Contributor
timestamp: April 22, 2013, 09:30:45 pm
content: Yeah, I really hope that this is the one thing that is causing all of this. But I'm slightly afraid that there is something else aswell since I can't get any test sound when in Diag mode. Which I think I should get.

author: Farb
author_rank: Contributor
timestamp: May 01, 2013, 08:29:19 am
content: Ok guys! I'm happy to say that Q15 was the reason behind PS-PRT but I get DC error and I'm clueless since on DIAG is says 000 and regular is between 3-33. Any hints?EDIT: I declare myself stupid cause one cable wasn't connected but my trouble run isn't over yet. I get no sound from the receiver at all. First when it starts up i hear that the speakers get power and like a double click on a relay inside the reciever but when I try to play something it's silent.

author: sportq
author_rank: Regular Contributor
timestamp: May 09, 2013, 02:48:23 pm
content: I'd check that the inputs, on the back panel, are associated with the device, on the front panel display, that you expect. I have a lowly RX-V450 and you can get in a real mess with this.Which physical input on the amp are you connecting the sound source to? Check the instructions in the user manual for the procedure to connect the jacks on the back (Comp1,2, IN1, IN2, etc) to a device on the front panel (DVD,D-TV,VDR, etc) you need to use the original remote to do this. It's designed for flexibility, not usability!Peter

author: Farb
author_rank: Contributor
timestamp: May 11, 2013, 05:43:01 pm
content: I will have a look at that but shouldn't I get radio as a default when I select it? It doesn't playback anything on the headphones neither speakers. I'm suspecting some other component that is busted. And the speakers shuts off due to "overheating" I suspect and in RESET mode I can override the automatic fan and leave it running for ever but that's not the ideal thing to do. Cause this issue varies from time to time.