electronics, repairs, service manuals and datasheets discussion community for the repairs professionals and technicians
FAQSearchMembersGroupsRegisterProfilePM'sLogin/Out
Yamaha DVDS795
Goto page Previous  1, 2
 
Post new topic   Reply to topic    Electronic equipment repair and service manual search discussion Forum Index -> Equipment Repairs
View previous topic :: View next topic  
Author Message
minarellip6



Joined: 13 Jan 2011
Posts: 8
Location: Italy Martina Franca

PostPosted: Tue Jan 18, 2011 6:58 pm    Post subject: yamaha dvds795 Reply with quote

Hello
I checked all voltages and in particular on ps1101 pins 1 to 18

1 -11 volts is -7.2 volts
3 +11 volts is 0 Volts
5 +5 volts is 0 volts
7 +3.3 volts is 0 volts
9 +3.3 volts is 0 volts
11 +5 volts is 0 volts
13 +9 volts is 0 volts
15 +5 volts is 0 volts
18 -29 volts is 0 volts

virtually no voltage is ok
Confused
What can I do?
Thanks
Smile
_________________
Ferrari are in my heart
Back to top
View user's profile Send private message
jts1957



Joined: 24 Nov 2008
Posts: 2476
Location: Far, Far Away

PostPosted: Tue Jan 18, 2011 10:37 pm    Post subject: Reply with quote

You are using a even number pin (2, 4, ...10, 12) as ground (reference) when making measurements?

Voltages on odd numbered pins 5 thru 13 will only be present IF pin 14 is low. (should go hi to low when power button is pressed.)

Pin 16 & 17 are to be measured to one another (not to ground). Pins 1, 3 15 & 18 all reference ground.

IF you have -7.2 on pin 1, usually pin 3 will have something on it.

Suggest you remeasure ALL and on any that you don't get a voltage on see what resistance measurement you get with instead.
_________________
You're over there, I'm over here.
Back to top
View user's profile Send private message
minarellip6



Joined: 13 Jan 2011
Posts: 8
Location: Italy Martina Franca

PostPosted: Wed Jan 19, 2011 7:13 pm    Post subject: yamaha dvds795 Reply with quote

Hello

Yes, I used the ground reference for measurements according to service manual
Yes pin 16 & 17 are to be measured to one another
I'm wrong on pin 1 measure -0.3 ..... -0.72 volts

What can I do?
Thanks
Smile
_________________
Ferrari are in my heart
Back to top
View user's profile Send private message
jts1957



Joined: 24 Nov 2008
Posts: 2476
Location: Far, Far Away

PostPosted: Thu Jan 20, 2011 2:12 am    Post subject: Reply with quote

Measure voltages on each pin of IC1021. Reference (ground) is Pin #2 of D1011.
_________________
You're over there, I'm over here.
Back to top
View user's profile Send private message
minarellip6



Joined: 13 Jan 2011
Posts: 8
Location: Italy Martina Franca

PostPosted: Thu Jan 20, 2011 2:56 pm    Post subject: Yamaha dvds795 Reply with quote

Hello
measuring the voltages on the pins of IC1021 with the ground reference pin # 2 of D1011
get

1 322 volts
2 0 volts
3 0 volts
4 0 volts
5 10 ...... 15 volts
6 0.01 ...... 0.04 volts
7 0 volts

What can I do?
Thanks
Smile
_________________
Ferrari are in my heart
Back to top
View user's profile Send private message
jts1957



Joined: 24 Nov 2008
Posts: 2476
Location: Far, Far Away

PostPosted: Fri Jan 21, 2011 1:17 am    Post subject: Reply with quote

Check all components around IC1021. Google "testing (name of component)" [example: testing diodes]. If you test a component "in circuit" and get an improper reading, try again after removing (at least) one lead from the circuit. Q1041, if tests good, should be as far to the right as you need to go.

If ALL surrounding components test O.K. - IC1021 itself would be the most likely suspect.

Found round here:
http://www.bdent.com/SearchResults.asp?Search=Strm6559&gclid=CLj6jb6NyqYCFQTrKgodhTmzGw
7. Foreign Orders:
Credit cards are encouraged. If not, payment in advance must be made in US funds by wire transfer (T/T), letter of credit (L/C) or international money order.
Note: all checks drawn from foreign banks must include a $15.00 handling fee. There are NO C.O.D. shipments to Canada.

Found round you: ?
_________________
You're over there, I'm over here.
Back to top
View user's profile Send private message
minarellip6



Joined: 13 Jan 2011
Posts: 8
Location: Italy Martina Franca

PostPosted: Fri Jan 21, 2011 6:55 pm    Post subject: yamaha dvds795 Reply with quote

Hello
all the surrounding components are ok.
I replaced IC1021.
but still nothing turns on.
What can I do
Thanks
Smile
_________________
Ferrari are in my heart
Back to top
View user's profile Send private message
jts1957



Joined: 24 Nov 2008
Posts: 2476
Location: Far, Far Away

PostPosted: Sat Jan 22, 2011 1:39 am    Post subject: Reply with quote

You must have missed something then. Or received a new defective IC, or the board or a foil has crack(s).

Sorry but that's about as far as I can guide you.
_________________
You're over there, I'm over here.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Electronic equipment repair and service manual search discussion Forum Index -> Equipment Repairs All times are GMT
Goto page Previous  1, 2
Page 2 of 2

 
Jump to:  
You can post new topics in this forum
You can reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


eServiceInfo on FB - Service Manuals Free Download - Service Diagrams

Free TV Schematics Download - HARDW.net - Pinout Master - Jabse Service Manual Search - Jabse.InK  - onTap.bg

SnimkiOt.com - Poblizo.com : пътешествия