Technics SA-EX310 Service Manual

SA-EX310
Likely faulty block if the normal
TP CD player Tape deck AF oscillator waveform shown at the left is not
present.
L1/R1 Input selector block IC402 &
area
0.5msec 2V 1msec 500mV 1msec 500mV
L2/R2 Dolby pro logic blockIC1001 and
IC1002& area
0.5msec 2V 1msec 500mV 1msec 500mV
L3/R3 Master volume block VR501 &
area
0.5msec 500mV 1msec 50mV 1msec 100mV
L5/R5 Power limiter block Q601 to
Q602 & area
0.5msec 100mV* 1msec 500mV 1msec 500mV
L6/R6 Main amplifier block IC601 &
area
0.5msec 5V* 1msec 10V 1msec 10V
NORMAL WAVEFORMS OF AMPLIFIER CIRCUIT AND LIKELY FAULTY BLOCKS
Measurement conditions. Volume control (VR501), Treble
control (VR512) and Bass control (VR511) positions :
*Volume control position (VR501) for these test :


CHECKING PROCEDURE FOR SURROUND CIRCUIT
Outputting surround signal normally requires that opposite phase signals be applied to both the left and right channels.
However, this unit incorporates a service mode, allowing the surround circuit to be tested using in-phase signals.
The letter SURROUND flash on the FL display.
When the CD player or AF oscillator is connected : When the tape deck is connected :
The letter SURROUND flash on the FL display.
Power on the unit.
Set the input selector button of the unit to the "CD"
position.
Power on the unit.
Set the input selector button of the unit to the "TAPE
MONITOR" position.
A
B
While pressing both "+" and "-" of the surround
level adjustment button "SURROUND, press the
"Power" button.
While pressing both "+" and "-" of the surround
level adjustment button "SURROUND, press the
"Power" button.

Technics SA-EX310 Specifications

General

Brand	Technics
Model	SA-EX310
Category	Receiver
Language	English