ALIGNMENT PROCEDURE (C372)
I. INITIAL ADJUSTMENT (No load connected)
A. OUTPUT OFFSET VOLTAGE
1. Connect a DC Millivoltmeter between TP303
&
TP304
(pin 1 of IC 301A & gnd),
then adjust VR303
(50kohms) to get a reading
as close as
0V as possible, +/-3V
.
2. Connect a DC Millivoltmeter between TP403
&
TP404
(pin 1 of IC 401A & gnd),
then adjust VR401
(50kohms) to get a reading
as close as 0V as possible, +/-3V
.
B. IDLING CURRENT
1. Connect a DC Millivoltmeter to TP301 and TP302, then adjust VR302 (500ohms)
for 5-6mV reading on meter.
2. Connect a DC Millivoltmeter to TP401 and TP402, then adjust VR402 (500ohms)
for 5-6mV reading on meter.
3. Leave power “ON” for a minimum of 5 minutes.
C. ISC SENSITIVITY
Connect a DC Millivoltmeter to TP701 and TP702, then adjust VR701 (47kohms)
between –50mV to -100mV.
II. FINAL
ADJUSTMENT
Repeat procedure A and B for offset voltage and idling current alignment respectively.
VR303 VR302
TP303 TP304
TP302
TP301
VR402
VR401
TP402
TP403 TP404
TP401
LEFT CHANNEL
RIGHT CHANNEL
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