Troubleshooting Aonais Oceans - Technics SA-EX100 Service Manual

:
SA-EX100
Ш Troubleshooting
This unithas test points on each circuit board block for use in troubleshooting.
CONNECTION
Connect either a CD player, tape deck or AF oscillatorto the input terminals of the unit.
AF oscillator усы хи му ы ынсы ры
i TAPE |
C» В
Tape Deck сь © 9 б Y 1
z kl mcus vr sS: ш 1
Connection
Input Terminals
equipment of the unit .
REQUIRED ITEMS
1. Testing with a CD player
2. Testing with a tape deck
3. Testing with a AF oscillator
Test deck (SZZP1054C / first progarm, 1kHz, OdB)
Test tape (QZZCLA / 315Hz, 048)
‚ Setthe output at 500Hz, 200mV
4. Oscilloscope (min. 10MHz) ----------- To measure the output waveform at the test points.
TEST PROCEDURE FOR AMPLIFIER CIRCUIT
Power on the unit, TS Poweron the unit.
Set the input selector button of the unit to the "CD" postion. Set the input selector button of the unit to the "TAPE MONITOR"
Set the Speaker ON/OFF button of the unit to the SPEAKERS "ON" postion.
position.
Set the Speaker ON/OFF button of the unit to the SPEAKERS "ОМ"
position,
<
Run the CD player
Run the АЕ oscillator
vV
Run the tape deck | .
pen 056С / first program) | ( Oscillatoroutput
1kHz, odB at500Hz, 200mV ( QZZCLA
315Hz, св)
Using the Oscilloscope, check the output waveforms at the test Note: Connect the '+' probe of .
points on the circuit boards of the unit in the following order: the oscilloscope to each
(189 (13,83) (4,84) (5,85) (6,86). test point and the '— probe
Refer to page 8. to chassis ground.
„~
TEST POINTS POSITIONS OF AMPLIFIER CIRCUIT
R6 (J110) |
| R4(IC511, pin 7)
| L1 (C413, +vé pin)
SS Е
(6(/109) ——E—
|
|
|
14 (cei 1, pin 1)
| To-
>
‫ا‬ ‫ل‬ ‎ R1 (C414, +ve pin)
R5 (C602) оо
шщ PEE |
L5 (C601)
PANEL P.C.B.
fect
SIDE)
|
(SOLDER SIDE)
-
L3 (УН502)
Аз (VR502)