Mod Thunderdrive Deluxe Troubleshooting Supplement

Use this troubleshooting supplement to help:



Measure DC voltage test points to identify major discrepancies and locate problem areas.

(Keep in mind that the voltage measurements will vary slightly from kit to kit. The voltages you measure should be in

the same ballpark, but do not expect to get the exact same value.)

Test Point

Location Description

Transistor Collector

You must plug a guitar cable into the input jack when taking the voltage measurements

because the input jack is set up to disconnect power from the circuit when unplugged.

Using a volt meter, connect the ground side lead of the meter to any ground point on the pedal.

One convenient ground point would be the output jack's ground lug. The other volt meter lead will

be used to measure DC voltage at the test points listed above and shown in the drawing on the next

page.

Transistor Base

Transistor Emitter

Power

LED Anode (+)

Voltage Measurement

3.1 VDC

0.6 VDC

0.0 VDC

8.9 VDC

2 VDC

Your Unit's Voltages

Table of Contents

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Do you have a question about the Thunderdrive Deluxe and is the answer not in the manual?

Page 1 Use this troubleshooting supplement to help:  Measure DC voltage test points to identify major discrepancies and locate problem areas. (Keep in mind that the voltage measurements will vary slightly from kit to kit. The voltages you measure should be in the same ballpark, but do not expect to get the exact same value.) Your Unit’s Voltages Test Point...
Page 2 DISTORTION OUTPUT Guitar cable must be plugged into the input jack while taking voltage measurements INPUT JACK OUTPUT JACK DC Voltage Test Points...
Page 3 DISTORTION OUTPUT Guitar cable must be plugged into the input jack while taking voltage measurements mVAC INPUT JACK OUTPUT JACK mVAC AC Voltage Test Points (Distortion set to Max)
Page 4 Continuity Tests With your meter set to check continuity, check the footswitch terminal continuity to make sure it is switching correctly. DISTORTION OUTPUT 3PDT Foot Switch Guitar cable must be plugged into the input jack while taking voltage measurements Switching function of the 3PDT switch. The solid line illustrates an internal connection between terminals.

K-955