IC100 or IC601 or IC500 or IC400(and peripheral
circuits) are out of order.
(PWB-MAIN)
Problem is in IC100 or IC601 or IC500 or
IC400 (and peripheral circuits).
Are the specified voltages available at the
connectors below?
CN
Name
Pin No. Voltage
A9V
J190
10
9Vdc
A1.5V
IC600
3
1.5Vdc
D1.5V
IC600
3
1.5Vdc
A3.3V
J190
5
3.3Vdc
D2.5V
J190
8
2.5Vdc
D1.9V
L400
-
1.9Vdc
AD3.3V
J190
6
3.3Vdc
NO
When the shown voltage is in
problem, PWB including the power
supply circuit (and peripheral
circuits) is the following.
Voltage
with
problem
PWB including
the circuit in
problem
A9V
SET(SUB)
A1.5V
MAIN
D1.5V
MAIN
A3.3V
SET(SUB)
D2.5V
SET(SUB)
D1.9V
MAIN
AD3.3V
SET(SUB)
YES
2-4-1 (P*)
2-4-1 (P*)
YES
(f=48KHz)
Is the signal of 1.0Vp-p available at pin 2(V_out)
of J110,or pin 4 (SY_out) of J110?
Pin2 of J110
Pin4 of J110
1.0Vp-p
YES
NO
IC701 or
IC702
(PWB-
SET(SUB))
are out of order.
Page 48
MODELS: LT-2220
/ LT-2240 /
LT-3020
/ LT-3040 / LT-3050