Pioneer GEX-P900DAB Service Manual page 36

GEX-P900DAB
2. TRK (Tracking) ADJUSTMENT
1) Connect the GEX-P900DAB to a DC regulated power supply. Connect the head unit and the GEX-P900DAB with an
IPBUS cable.
2) Connect SG to ANT input.
3) Set the power to ON, and enter DAB Service mode.
4) BAND 3 ADJUSTMENT
Set frequency to 10 A. Set SG to 209.936 MHz and 35 dBuV. Then, check SLEVEL terminal (IC 391, Pin 7) with DMM
(2) so that SLEVEL voltage can be measured. Use the adjustment stick to adjust the air-core coil (L473) in front of
FET to maximum SLEVEL voltage. Similarly, adjust the air-core coil (L475) behind FET, as well as the air-core coil
(L477) behind L475. Repeat these adjustment steps several times to set SLEVEL voltage to maximum.
5) L-BAND ADJUSTMENT
Basic adjustment of L-Band is the same as adjustment of BAND 3. Set frequency to L12. Set SG to 1471.792 MHz
and 25 dBuV.
Use the adjustment stick to adjust the air-core coil (L503) in front of FET to maximum SLEVEL voltage. Similarly,
adjust the air-core coil (L505) behind FET, as well as the air-core coil (L507) behind L505. Repeat these adjustment
steps several times to set SLEVEL voltage to maximum.
- Confirmation of Operation
Equipment required:
• Head unit
• RF SG: Capable of outputting DAB signals up to 1.5 GHz (IQ modulation function is required)
• DAB encoder (e.g. KENWOOD DAB-3801)
1. Confirming Operation
1) Confirming BAND 3
Set the encoder to MODE 1.
Set the receiver and RF SG as shown below. Measure the error rate (see Note) to check whether the sensitivity
and maximum input of the specification are satisfied.
Receiver RF SG
5 A 174.928 MHz
10 A 209.936 MHz
13 F 239.200 MHz
2) Confirming L-BAND
Set the encoder to MODE 2.
Set the receiver and RF SG as shown below. Measure the error rate to check whether the sensitivity and maxi-
mum input of the specification are satisfied.
Receiver RF SG
L 1 1452.960 MHz
L12 1471.792 MHz
L23 1490.624 MHz
Note:
Error rate is evaluated at 1E-4 if the error rate after correction can be measured. To measure the error rate before cor-
rection, evaluation should be made at 5E-2.
The unit operates correctly if the specification is satisfied.
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