Mod K-915, Troubleshooting Supplement, Page: 1 / 5

1
2
3
1
2
3
-
+
500KL 100KL
1
2
3
4
5
6
GROUND
1K
11 13
6.8K
.1 µ
4
7
3
J
7.5K
5102
D G S
.02 µ
1K
6.8K
17
7
8
L
0
5
Out
In
G
n
d
3M
2
56K
TIP
39K
1
0
4
J
1
0
µ
F
5
0
V
1
.5
K
5102
D
G S
7
4.
7K
4.
7K
15
M
o
d
e
l:
B
T
D
R
-2
H
a
c
c
u
tr
o
n
ic
s
6
5
4
3
2
1
®
BLK
RED
Q1
Q2
A
B
C
J
K
L
M
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.)
Using a volt meter, connect the ground side lead of the meter to any ground point on the pedal.
One 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 shown below.
A (Power Supply):
B (Vcc):
D (Q1 D rain):
E (Q1 G ate):
F (Q1 S ource):
G (Q2 D rain):
H (Q2 G ate):
I (Q2 S ource):
C (LED Anode):
J (BTDR Pin 1 - Vcc):
K (BTDR Pin 3 - Vin):
L (BTDR Pin 5 - Vout):
M (BTDR Pin 6 - Vout):
DC Voltage Test Points
9.1 VDC
5.0 VDC
2.0 VDC
6.1 VDC
0.0 VDC
0.7 VDC
8.3 VDC
0.0 VDC
0.9 VDC
5.0 VDC
0.0 VDC
0.0 VDC
0.0 VDC