Pioneer X-HMD01, Service Manual

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56
X-HMD01, X-HMD03, X-HX99, X-HX05
6. ADJUSTMENT
6.1 CD SECTION
Note : There is no information to be shown in this section.
• Set the mode selector to FM BAND.
• Connect the wiring as shown in Fig. 1.
6.2 MD SECTION
6.3 TUNER SECTION
6.3.1 FM Tuner Section
• Set the mode selector to AM BAND.
• Connect the wiring as shown in Fig. 1.
6.3.2 AM Tuner Section
Note : There is no information to be shown in this section.
Step
No.
Adjustment
Title
FM SG (1kHz,
±
75kHz dev.)
Reception
Frequency
Display
Adjustment
Location
Specifications
Frequency
(MHz)
Level
(dB
µ
V)
1
DET. waveform
Coil Adjustment
98 60 98MHz L7
• Adjust L7 so that the voltaghe between TP8 (+)
and TP9 (
−
) becomes 0V
±
50mV.
• Check the waveform with the oscilloscope, and
confirm so that the output level is about
−
11
±
2dBV and THD is about 0.5
±
0.1%.
Confirm that the "TUNE" indicator in the LCD is
turned on.
Step
No.
Adjustment
Title
AM SG (400Hz, 30% Mod.)
Reception
Frequency
Display
Adjustment
Location
Specifications
Frequency
(kHz)
Level
(dB
µ
V/m)
1
Vt
(Tuning Voltage
Adjustment)
530
1700
−
−
530kHz
1700kHz
L2
−
• Adjust L2 so that the voltage between TP6 (+) and TP7
(
−
) becomes 1.0V.
• Set the reception frequency to 1700 kHz and confirm
that the voltage is about 6.6V.
2 IFT Adjustment 1000 S/N about 10dB 1000kHz T1
1. Connect an electrolytic capacitor of about 10
µ
F to TP9
(TP9 side is +), and terminate with TP10 by a resistor
of about 47k
Ω
. Connect the sweep input to the both
ends of terminated resistor.
2. Adjust T1 so that the marker of 450kHz
±
3kHz
becomes the same level (single-peak characteristic of
IF becomes symmetrical).
3. Input 74dB
µ
V from the SSG, confirm the waveform of
output signal so that the output level is
−
27V
±
2dBV
and THD is about 1
±
0.5%. And confirm that the
"TUNE" indicator in the LCD is turned on.
3
Tracking
Adjustment
600
1400
50
(S/N about 10dB)
600kHz
1400kHz
L1
TC1
Connect an oscilloscope to TP3 (L) and TP4 (R), and
adjust L1 (600kHz) and TC1 (1400kHz) repeatedly so that
the output level becomes maximum.
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