[![MAX134CMH MQFP44](https://i.stack.imgur.com/FtXgn.png)](https://i.stack.imgur.com/FtXgn.png)[![enter image 2](https://i.stack.imgur.com/DNe6Z.png)[2](https://i.stack.imgur.com/DNe6Z.png)

[![description here](https://i.stack.imgur.com/aOL25.jpg)](https://i.stack.imgur.com/aOL25.jpg)

[![MAX134](https://i.stack.imgur.com/SDEne.jpg)](https://i.stack.imgur.com/SDEne.jpg)

I have a Protek 506 DMM, and I'm trying to troubleshoot an issue.

I found a schematic diagram for the meter on the internet, but it is a copy of an original that has a fold in the middle, right where I am trying to read the value of C58 (I'm not sure if that is the capacitor's number, as the value and the name are on that crease). The capacitor is mounted between pin 25 and the ground, on the MAX 134 ADC. Pin 25 is connected to a resistor network, and is one of the four voltage ranges, but it is the only one that has a capacitor to ground on it. Pin 25 is labelled "1.11M", and the others are: 101K, 10K and 1K.

Any idea what the value of capacitor C58 would be?

Here is a link to download the PDF of the schematic diagram (6 pages):
<https://elektrotanya.com/protek_hung_chang_506_dmm_sch.pdf/download.html#dl>

The problem with this meter is that the the diode tester function is not working (won't change from displaying "OPEn" and 3.999V), nor the 4VDC range, and it appears that they are related somehow. On the 4VDC range, the display alternates between showing 3.999V and 0V. If a voltage is measured, say a 1.5V cell, then the display will alternate between showing 3.999V and 1.5V.