Aiwa LCX-100 Service Manual page 19

(CD SECTION)
Note:
1,
- Connect a probe (10: 1) of the oscilloscope to a test
point.
Focus offset Adjustment
Oscilloscope
(DC range)
TP1 (FEI) ©
TP4 (VREF) ©
1) Make short-circuit between TP2 (RFO) and TP4 (VREF)
by wire.
2) Connect an oscilloscope between test points TP] (FEI)
and TP4 (VREF).
3) Turn on the main power to the CD player.
4) Insert the test disc TCD-782 (YEDS-18) and reads the
TOC data.
5) Adjust SFR302 so that the offset level is Ot20mV.
6) Remove short-circuit after completing adjustment.
Focus Balance Adjustment
Make the focus bias adjustment when replacing and repairing
the optical block.
Oscilloscope
(DC range)
TP2 (RFQ) o
TP4 (VREF) ©
1) Connect an oscilloscope to test points TP2 (RFO) and
TP4 (VREF).
2) Tur on the power switch.
3) Insert test disc TCD-782 (YEDS-18) and play back the
second composition.
4) Adjust SFR301 so that the level of RF wave to be
maximum and clear.
17
TRI K KKK)
XY NYY RRRX
WY
()
RR KRY
*,5 /
PRK
VOLT/DIV: 20mV
TIME/DIV: 0.2uS
3. Tracking Balance Adjustment
Oscilloscope
(DC range)
TP3 (TSO) o
TP4 (VREF) o
1) Connect an oscilloscope to test points TP3 (TSO) and
TP4 (VREF).
2) Tum on the power switch.
3) Insert test disc TCD-782 (YEDS-18) and press the PLAY
(P ) button.
4) Push and hold the p>] button. (MS mode)
5) Adjust SFR304 so that the waveform on the oscilloscope
is vertically symmetrical as shown in the figure below.
o +}