mercotronic mdl 9800 tester.

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jeffreyward2
Posts: 3
Joined: Sat Apr 04, 2015 2:49 pm

mercotronic mdl 9800 tester.

Postby jeffreyward2 » Sat Apr 04, 2015 2:59 pm

Does anyone know someone who can repair this tester ? It does not test condensers . Reason is bought a battery from Battery plus bulbs and the top plate from factory duracell 903 . Positive and negative were reversed from factory . I called Arthur at mercotronic they have parts but don't service these testers . I am trying to get duracell to pay for repair they are going to have corporate call me . Any help would be appreciated ! My name is Jeff & phone number is 414-708-5784 or email rugercarbine40@gmail.com .

debe
Posts: 81
Joined: Sat Apr 04, 2015 7:22 pm

Re: mercotronic mdl 9800 tester.

Postby debe » Sat Apr 04, 2015 7:29 pm

Will email some pictures later today of the circuit board with what is most likely to be damaged by reverse polarity. It should only be a couple of diodes & or the NE555 ic.

debe
Posts: 81
Joined: Sat Apr 04, 2015 7:22 pm

Re: mercotronic mdl 9800 tester.

Postby debe » Sun Apr 05, 2015 3:21 am

Went to post pictures & you email address doesn't seem to work. So the most likely part that's faulty will be the NE555 IC, check P8 on the IC it should have +5v DC on it, if it does then replace it they are cheep about $1 ea.

jeffreyward2
Posts: 3
Joined: Sat Apr 04, 2015 2:49 pm

Re: mercotronic mdl 9800 tester.

Postby jeffreyward2 » Mon Apr 06, 2015 6:28 pm

I'm not a member so that could be why . I'm not good at electronics repair , that's why I'm asking for repair help. Mechanics is easy for me . Email is rugercarbine40@gmail.com or phone 414-708-5784 . I would really appreciate the help .

jeffreyward2
Posts: 3
Joined: Sat Apr 04, 2015 2:49 pm

Re: mercotronic mdl 9800 tester.

Postby jeffreyward2 » Mon Apr 06, 2015 6:31 pm

debe wrote:Went to post pictures & you email address doesn't seem to work. So the most likely part that's faulty will be the NE555 IC, check P8 on the IC it should have +5v DC on it, if it does then replace it they are cheep about $1 ea.

I do not have a schematic or know the names of parts Please help debe !!

debe
Posts: 81
Joined: Sat Apr 04, 2015 7:22 pm

Re: mercotronic mdl 9800 tester.

Postby debe » Tue Apr 07, 2015 6:44 am

Hi Jeff have sent an email with pictures, apears to be successful this time. Incidently I am in Australia. Forgot to mention in the email the picture with the 555ic pin 8 is at the point of the biro to measure for the 5v.

debe
Posts: 81
Joined: Sat Apr 04, 2015 7:22 pm

Re: mercotronic mdl 9800 tester.

Postby debe » Mon Dec 04, 2017 7:35 am

MERC O TRONIC. 4.9V Zenner.JPG
MERC O TRONIC. 4.9V Zenner.JPG (825.74 KiB) Viewed 136 times
NE555 P8 +5V.JPG
NE555 P8 +5V.JPG (688.56 KiB) Viewed 136 times
This is where there should be 5V on the IC. Also the Zener diode that is part of the 5v supply to the 555IC.

Jeff Register
Central Arizona Chapter President
Posts: 958
Joined: Wed Mar 11, 2015 7:19 pm
Location: Mesa, Arizona

Re: mercotronic mdl 9800 tester.

Postby Jeff Register » Mon Dec 04, 2017 10:45 am

Debe,
Triple 5 timer is one of the oldest chips around sept the 556.
Jeferyward, I can send a diagram of the 555 if you want. Need a solder sucker & low temp pencil & it's easy. Look for the notch & replace in the same direction.


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