Hi everyone,

 

Was wondering if you guys can help my time clock has stopped working it was on and off at one point but has now stopped working completely is there any one that knows how to fix them as I have three that need fixing. Thank you

Short of Resoldering every joint I don't think so

 

I ended getting a new one off ebay that cost more in Import Charges and VAT than the clock itself

Hi everyone,

 

Was wondering if you guys can help my time clock has stopped working it was on and off at one point but has now stopped working completely is there any one that knows how to fix them as I have three that need fixing. Thank you

 

 

http://twinturbo.net/nissan/300zx/tech/clock/clock.html

 

 

 

 

 

 

Center Console Clock Repair:

Most of the older Z32s have problems with their clocks. The display gets too dim, or goes out altogether. With the cost of a new OEM clock above one hundred dollars, most opt to put in a turbo timer or some other small electronics in the prime console real-estate, install an audio head unit with a clock display on it and call it a day. Fixing the OEM clock is surprisingly simple if you have some soldering skills to replace some resistors buried inside it. NOTE: this process will not work for everyone due to the fact the old 181 ohm resistors may have failed to the point where they allowed too much current to go through the board and damaged some other component. It is definitely worth it to try, can't be made much worse.

Tools/Parts:

 

flat head screwdriver

soldering iron (not a soldering gun)

solder (rosin core)

2 180 ohm 1/2 watt resistors

de soldering wick (not shown) to help clean up excess solder

multi meter, not required but can be extremely helpful

 

Procedure:

 

1. Remove the clock from the dash by removing the front console. There are two screws behind the trim plate above the top DIN slot (1.) and two more behind covers left and right of the top vents (2.). The clock is held in by 2 Philips head screws. Unscrew it and unplug it. Take the front and back covers of the clock apart by inserting the flathead into the slots located on the bottom of the display area (3.). Twist the screwdriver and it should loosen up the plastic tab. Do the same for the other side and the front plate will come apart.

 

2. With the 2 covers removed, the plug will be on the back cover of the two halves. Forcefully press forward to remove it out of the slot that's holding it in (4.). NOTE: It can be rather hard to remove so go easy on it as well as remember the position it was on for re-assembly later.

 

3. Separate the top and bottom boards. There are 6 pins to de-solder (red dots in 5.). De-solder them and carefully place a screwdriver between the black plastic and the bottom part of the board to CAREFULLY pry them apart. It will not come apart easily. If it is too difficult, try to remove as much solder as possible holding the 6 pins in place (6.).

 

4. Take the board with the glass display and flip it around. Notice the 2 flat, black, resistors marked with a "181" on them (2 red dots in 7.). These resistors need to be removed. Actually, the only one needing to be removed and replaced is the one connected to the cathode heaters on the display. However, I would replace them both because if one fails then there is a possibility they both might be defective. Try to remove as much solder as possible holding the resistors in place. Remove the 2 "181" ohm resistors by removing or breaking them off the board with the flat head screwdriver. NOTE: Be careful not to slip which will cause the screwdriver to damage another part or scratch the traces (metal paths) on the board.

 

5. Once the old resistors are removed, measure the length of the new resistor wires to match the circular prints which are approximately 2-3 mm below the old resistor solders. I would not re-solder the new resistor in the same place as the old, because when they were removed, they may have damaged the traces under them (8.). Solder the new resistors onto the board carefully. Make sure the resistor wires aren't touching any exposed parts cause it might ground and/or short out components . Do the same for the other resistor (9.).

 

6. Put the top and bottom halves back together and re-solder the 6 pins. Place the plug through the back cover and snap it back into place. Place the clock snug into the back cover and then seal/snap together the front cover to combine the to halves. Go back to the Z, plug it in, turn the key to the 'On' position. If done properly, the clock should illuminate like new.

Edited March 25, 20187 yr by JeffTT

Hi everyone,

 

Was wondering if you guys can help my time clock has stopped working it was on and off at one point but has now stopped working completely is there any one that knows how to fix them as I have three that need fixing. Thank you

 

Depending on the part# of the clock you have the repair procedure to fix the common resistor problem which stops the

clock working is slightly different as the PCB layout changed.

 

The procedure published on TT.net is for 25820-30P00 clocks.

 

http://twinturbo.net/nissan/300zx/tech/clock/clock.html

 

If you have a 25820-40P00 clock then the procedure published here is the one to follow:

 

https://aus300zx.com/xenforo/index.php?threads/clock-repair.276856/

Hi guys, Thanks for your reply and info very helpful but it's not something I can do myself, is there any one on the club that can fix them at all for me please

Is there anyone that knows how to fix them I have three that need doing please

Picking this thread up, I have repaired 2 clocks as per the links quoted above, however they have only worked for a short while before going on and off again intermittently.

Is the clock one of those ZX ‘common problem’ that I will have to live with?

It is possible that the VFD's (displays) are failing. For two to fail after repair is odd. Is the wiring/plug to the

clock in good order? Which type do you have - 25820-30P00 or 25820-40P00?

Both of mine are the ones in the first twinturbo link, even after repairs on both they do still come on occasionally

A long time ago, some where on the internet I found a link for building your own replacement that looked pretty similar using new components. Ive had a quick google and cant seem to find it, but maybe have a look? Both my clocks have given up ages ago, I might get around to fixing them, but at the moment its not high on my to-do list

A long time ago, some where on the internet I found a link for building your own replacement that looked pretty similar using new components. Ive had a quick google and cant seem to find it, but maybe have a look? Both my clocks have given up ages ago, I might get around to fixing them, but at the moment its not high on my to-do list

 

Thanks, will look into it when i get a moment

That’s good timing. I noticed yesterday that my clock has given up on me. No doubt i’ll give this a try at some point.

 

Thanks for posting the write-up Jeff.

Is there anyone that knows how to fix them I have three that need doing please

 

Yup - AndyP is your man, I believe..... Providing he still does, of course.....:wink:

A long time ago, some where on the internet I found a link for building your own replacement that looked pretty similar using new components. Ive had a quick google and cant seem to find it, but maybe have a look? Both my clocks have given up ages ago, I might get around to fixing them, but at the moment its not high on my to-do list

 

Back when I was a member on the Aussie forum there eas one guy in Western Australia who suggested using a clock internal found on ebay, which he provided a 3D prjnted insert to adapt the PCB to the internal of the original Nissan clo v k shell.

Back when I was a member on the Aussie forum there eas one guy in Western Australia who suggested using a clock internal found on ebay, which he provided a 3D prjnted insert to adapt the PCB to the internal of the original Nissan clo v k shell.

 

That rings a massive bell, I thought it was something like that. It looked quite good and you could have different colour numbers to match your interior.