Pioneer KEH-P2033R Service Manual page 33

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- FM/AM Tuner Unit
AMRF
AMANT
28 ATT
ANT ADJ
FMANT
27 ATT
RFGND
26
FMRF
LOCH
25
23
No. Symbol I/O Explain
1 STIND O
2 FMSD O
3 NL1 O
4 NL2 O
5 Rch O
6 Lch O
7 WC
TE
L 13942296513
8 SDBW O
9 NC
10 VDD
11 DGND
12 CE2 I
13 SL I/O signal level
14 DI/DO I/O data input/
15 CK I
16 CE1 I
17 NC
18 LDET O
19 CREQ I
20 NC
21 COMP O
22 VCC
23 LOCH I
24 FMLOCL I
25 LOCL I
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26 RFGND
27 FMANT I
28 AMANT I
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FM/AM 1ST IF 10.7MHz
MPXREF 41kHz
T51 Q51 CF51 CF52 CF53
AMDET
IC1
MIXER, IF AMP, DET.
CF202
IC 3
X901
IMG ADJ AM 2ND IF
EEPROM
10.25MHz
450kHz
VDD
VCC
RF ADJ
LOCL
7 17 20 22 10 19 14 24 9 11
stereo "Low" when the FM stereo signals are received.
indicator To be pulled up to the "VDD" at 47kΩ.
FM station "High" when signals are received. To be pulled up to the "VDD" at 47kΩ
detector Meanwhile, 10kΩ 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)
noise level-1 "High" when noise is received. Output for the RDS. GND at 47kΩ // 1,800pF.
noise level-2 "High" when noise is received. Output for the RDS. GND at 36kΩ // 330pF
R channel FM stereo "R-ch" signal output or AM audio output.
output Add the specified de-emphasis constant.
L channel FM stereo "L-ch" signal output or AM audio output.
output Add the specified de-emphasis constant.
write control EEPROM write control. Writing permissible at "Low". Normally open.
SD bandwidth SD bandwidth signal output. For detection of detuning data for the RDS.
Not used
power Power supply pin for the digital section.
supply DC 5V +/- 0.25V. Be careful about overlapping noise in the logic section.
digital ground Grounding for the digital section.
chip enable-2 EEPROM chip enable. Active a "Low"
To be pulled up to the "VDD" at 47kΩ
Received FM/AM signal level (strength) output.
Connect the specified load resistor and capacitor (10kΩ + 39kΩ // 4,700pF)
Data input/Data output
data output To be pulled up to the "VDD" at 47kΩ
clock Clock input To be pulled up to the "VDD" at 47kΩ
chip enable-1 AF·RF chip enable. Active at "High" To be grounded at 47kΩ
Not used
lock detector Active at "Low". To be pulled up to the "VDD" at 47kΩ
current request Active at "Low". To be grounded at 47kΩ
Not used
composite signal FM composite signal output. r out < 100Ω
power supply Analog section power supply pin.DC 8.4V +/- 0.3V
local high FM local high pin. When seeking local high, apply 5V together with "LOCL".
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.
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.
RF ground Grounding for the antenna section.
FM antenna input FM antenna input. 75Ω. Surge absorber (DSP-201M-S00B) is necessary.
x ao
y
AM antenna input AM antenna input. High impedance.
Connect to the antenna through an L (LAU type) of 4.7µH.To cope with the
i
power transmission line hums, insert a series circuit consisting of an L
(a coil of about 100mH) + R (a resistor of 470 Ω to 2.2kΩ) between the GND.
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L ch
IC 2 FM MPX
6
R ch
5
COMP
21
LDET
18
12 15 16 8 13 2 3 4 1
Q Q
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KEH-P2033R/XM/EW
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