Car Power Amplifier - Sony XM-1502SX Training Manual

This power amplifier section is divided into the following parts:
•
Hookup
•
Circuit Block Concept / Overview
•
Pulse Power Supply – Power ON / Audio Unmute
•
Pulse Power Supply – Oscillator / Output
•
Pulse Power Supply – Testing
•
Audio Processing – Input Stages
•
Audio Processing – Output Operation
•
Audio Processing – Output Troubleshooting
•
Protection Circuit – Oscillator Stop 1 (Thermal)
•
Protection Circuit – Oscillator Stop 2 (Offset)
•
Protection Circuit – Oscillator Stop 3 (Current)
Hookup
Single Speaker – Mono or Center
Mono - By changing the audio input, output and ground configuration, the stereo power amp can alternately be
used in a bridged monaural configuration for more power as shown in Figure 1-1. Only the left input jack is used
in monaural.
INPUT
L
MONO
R
(STEREO)
+
BATT.
-
PL801
30 OHM
Chapter 1 - Car Power Amplifier
C221 R254
0.1
1k
+
R154
4.7k
DC
R811 2.2k
INPUT
AMP.METAL
CASE
C804
0.1
FIGURE 1-1 - FLEXIBLE INPUT CONFIGURATION
C101
+
HOT
C102
-
L. AMP.
C131
220
16V
C201
-
HOT
C202
+
R. AMP.
(INVERT.)
2

1. Car Power Amplifier

MONO STEREO
+
+
4 Ω
-
-
+
4Ω
-
-
+
4 Ω
-
+
380W@ 150W@
0.1% THD 0.04% THD
12A125 1487 11/11/02