Pioneer KEH-P4020R, Service Manual

Page: 40 / 47

40
No. Symbol I/O Explain
1 STIND O stereo "Low" when the FM stereo signals are received.
indicator To be pulled up to the "VDD" at 47k
Ω
.
2 FMSD O FM station "High" when signals are received. To be pulled up to the "VDD" at 47k
Ω
detector Meanwhile, 10k
Ω
should be used when taking diver FIX trigger from here
and "High: 0.9VDD or more" and "Low: 250mV or less".
(Should satisfy the diver IC specifications)
3 NL1 O noise level-1 "High" when noise is received. Output for the RDS. GND at 47k
Ω
//1,800pF.
4 NL2 O noise level-2 "High" when noise is received. Output for the RDS. GND at 36k
Ω
//330pF.
5 Rch O R channel FM stereo "R-ch" signal output or AM audio output.
output Add the specified de-emphasis constant.
6 Lch O L channel FM stereo "L-ch" signal output or AM audio output.
output Add the specified de-emphasis constant.
7 WC write control EEPROM write control. Writing permissible at "Low". Normally open.
8 SDBW O SD bandwidth SD bandwidth signal output. For detection of detuning data for the RDS.
9 NC Not used
10 VDD power Power supply pin for the digital section.
supply DC 5V +/- 0.25V. Be careful about overlapping noise in the logic section.
11 DGND digital ground Grounding for the digital section.
12 CE2 I chip enable-2 EEPROM chip enable. Active a "Low"
To be pulled up to the "VDD" at 47k
Ω
13 SL I/O signal level Received FM/AM signal level (strength) output.
Connect the specified load resistor and capacitor (10k
Ω
+ 39k
Ω
//4,700pF)
14 DI/DO I/O data input/ Data input/Data output
data output To be pulled up to the "VDD" at 47k
Ω
15 CK I clock Clock input To be pulled up to the "VDD" at 47k
Ω
16 CE1 I chip enable-1 AF·RF chip enable. Active at "High" To be grounded at 47k
Ω
17 NC Not used
18 LDET O lock detector Active at "Low". To be pulled up to the "VDD" at 47k
Ω
19 CREQ I current request Active at "Low". To be grounded at 47k
Ω
20 NC Not used
21 COMP O composite signal FM composite signal output. r out < 100
Ω
22 VCC power supply Analog section power supply pin.DC 8.4V +/- 0.3V
23 LOCH I local high FM local high pin. When seeking local high, apply 5V together with "LOCL".
24 FMLOCL I FM local low FM local low pin. When seeking local low, apply 5V to the base of the NPN
transistor with which the specified resistor is being connected to the emitter.
Keep it open in case of ordinary marketed models.
25 LOCL I local low FM/AM local low pin. When seeking local low, apply 5V to the base of the
NPN transistor. Since this pin is exclusive for AM when the FMLOCL is in use,
do not drive it under FM.
26 RFGND RF ground Grounding for the antenna section.
27 FMANT I FM antenna input FM antenna input. 75
Ω
. Surge absorber (DSP-201M-S00B) is necessary.
28 AMANT I AM antenna input AM antenna input. High impedance.
Connect to the antenna through an L (LAU type) of 4.7µH.To cope with the
power transmission line hums, insert a series circuit consisting of an L
(a coil of about 100mH) + R (a resistor of 470
Ω
to 2.2k
Ω
) between the GND.
-
FM/AM Tuner Unit