Technics SAEX310 - RECEIVER, Service Manual

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SA-EX310
Likely faulty block if the normal
TP CD player Tape deckAF oscillator waveform shown at the left is not
present.
C1 Dolby pro logic block
IC1001 and IC1002 & area
S1
0.5msec 1V 1msec 100mV 1msec 200mV
C2 Master volume block VR501 &
area
S2
0.5msec 200mV 1msec 20mV 1msec 50mV
C3 Tone control block IC551 & area
S3
0.5msec 200mV* 1msec 500mV 1msec 1V
( ) ( )
B
Run the tape deck
Run the AF oscillator Run the CD player
QZZCLA
315Hz, 0dB
( )
Oscillator output
at 500Hz, 200mV
SZZP1054C/first program
1kHz, 0dB
A
Using the Oscilloscope, check the output waveforms at the test points on
the circuit boards in the following order :
(C1,S1) (C2,S2) (C3,S3) (C4,S4) (C5,S5).
• To exit the service mode, power off the unit.
TEST POINTS POSITIONS OF SOURROUND CIRCUIT
NORMAL WAVEFORMS OF AMPLIFIER CIRCUIT AND LIKELY FAULTY BLOCKS
PANEL P.C.B. ( component side )
Note: Connect the '+' probe of
the oscilloscope to each
test point and the '–'
probe to chassis ground.
MAIN P.C.B. ( component side )
C1
S1
S3
C3
C4
+
+
C604
C603
J22
J21
J313
J316
S4
C5
S5
J246
J245
S2
+
C551
R552
C2