Mod Wave - Wave Troubleshooting Supplement; DC Voltage Measurements

The one hand rule (pictured below): is a safety precaution for working on an amp that is
plugged in or could potentially have high voltages present. Using alligator clips with your
DMM, clip the ground side to the chassis and use the other side to probe at various test points
with one hand. This prevents a fatal shock which can result from current passing through the
heart. (Many people even put their other hand in their pocket or behind their back).
The Wave Troubleshooting Supplement
The next step after thoroughly double-checking your connections is to take voltage measurements to help
locate problem areas. Please keep safety first and always remember the one hand rule.
DC Voltage Measurements
First, make sure all of your DC voltage measurements are in order. Use the layout drawing (or schematic) to
find the locations of the DC voltage measurements listed below. Your measurements should be in the same
ballpark, but do not expect to measure the exact same values listed here.
HV
A
B
C
D
E
F
Test Point
G
H
I
J
K
L
M
N
O
P
Q
Measurement
330 VDC
320 VDC
271 VDC
255 VDC
246 VDC
157 VDC
1.3 VDC
178 VDC
1.7 VDC
316 VDC
5.8 VDC
182 VDC
1.3 VDC
263 VDC
176 VDC
1.3 VDC
123 VDC
135 VDC
If you would like troubleshooting help, please e-mail us a
listing of your voltage measurements and briefly explain the
problem:
info@modkitsdiy.com