Aiwa CSD-MD50, Service Manual, Page: 40 / 74

58
< CD SECTION >
8. Tracking Balance Adjustment
Oscilloscope
(DC range)
+
–
TP2 (TB)
TP3 (VREF)
1) Connect an oscilloscope to the test points TP2 (TB) and
TP3 (VREF).
2) Turn on the power switch.
3) Insert test disc TCD-782 (YEDS-18) and press the CD
PLAY button.
4) Adjust SFR501 so that the waveform on the oscilloscope
is vertically symmetrical as shown in the figure below.
5) After the adjustment is completed, remove the connected
lead wires from the terminals.
0V
B
A
A = B
VOLT/DIV: 0.2V
TIME/DIV: 1mS
< DECK SECTION >
9. Tape Speed Adjustment
Settings: • Test tape: TTA-100
• Test point: CN201
• Adjustment location: SFR1
Method: Playback the test tape by adjust SFR1 so that
the frequency counter reads 3000Hz±10Hz.
Check that the counter reading in the REV
mode is within the range of ±45Hz of that in
the FWD mode.
10. Azimuth Adjustment
Settings: • Test tape: TTA-300
• Test point: J201 (PHONES)
• Adjustment location: Head azimuth
adjustment screw
Method: Playback the 10kHz signal of the test tape and
adjust the adjustment screw so that the output
becomes the -0.5dB point below the maximum
reading. The adjustment must ends with the
clockwise rotation of the adjustment screw.
Perform this adjustment in both FWD and
REV directions. Fix the adjustment screw with
adhesive agent upon completion of adjustment.
< TUNER SECTION >
< FM SECTION >
IHF Sensitiviy: More than 20dB
(THD 3%) (at 88.0/98.0MHz)
More than 22dB
(at 108MHz)
Signal to noise ratio: More than 55dB
(at 98.0MHz)
Distortion: Less than 1.5%
(Input: 54dB) (at 98.0MHz)
Stereo separation: More than 20dB
(at 98.0MHz)
Intermediate frequency: 10.7MHz
< AM SECTION >
Sensitivity: 54dB±6dB (at 603kHz)
(S/N 20dB) 52dB±6dB
(at 999/1404kHz)
Signal to noise ratio: More than 36dB
(Input: 74dB) (at 999kHz)
Distortion: Less than 2.0%
(at 999kHz)
Intermediate frequency: 450kHz
< DECK SECTION >
Tape speed: 3000Hz±60Hz
Wow & flutter: Less than 0.21%
(W.R.M.S)
Take-up torque:
30
-
55g-cm (FWD, REV)
F.F torque: 75
-
160g-cm
REW torque: 75
-
160g-cm
Back tension: 3±4g-cm (FWD, REV)
PB Output level: 190mV±1dB (LINE OUT)
REC/PB Output level: 190mV±2dB (LINE OUT)
Distortion (REC/PB): Less than 3%
(NORM, CrO
2
)
Noise level (PB): Less than 3.5mV
(DOLBY NR OFF, NORM)
Noise level (REC/PB): Less than 3.5mV
(DOLBY NR OFF, NORM)
Erasing ratio: More than 55dB
REC bias frequency: 85kHz
Test tape: NORMAL TTA-100
CrO
2
TTA-200
PRACTICAL SERVICE FIGURE