Fm/Am Tuner Unit - Pioneer DEH-1400 Service Manual

- FM/AM Tuner Unit

FM/AM 1ST IF 10.7MHz
AMRF T51 Q51 CF51 CF52 CF53
AMANT
28 ATT
ANT ADJ
MIXER, IF AMP, DET.
FMANT
27 ATT
RFGND
26
FMRF
IMG ADJ AM 2ND IF
450kHz
RF ADJ
LOCH LOCL
23 25
No. Symbol I/O Explain
1 STIND O stereo
indicator
2 FMSD O FM station
detector
3 NL1 O noise level-1
4 NL2 O noise level-2
5 Rch O R channel
output
6 Lch O L channel
output
7 WC write control
8 SDBW O SD bandwidth
9 NC
10 VDD power
supply
11 DGND digital ground
12 CE2 I chip enable-2
13 SL I/O signal level
14 DI/DO I/O data input/
data output
15 CK I clock
16 CE1 I chip enable-1
17 NC
18 LDET O lock detector
19 CREQ I current request
20 NC
21 COMP O composite signal
22 VCC power supply
23 LOCH I local high
24 FMLOCL I FM local low
25 LOCL I local low
26 RFGND RF ground
27 FMANT I FM antenna input FM antenna input. 75Ω. Surge absorber (DSP-201M-S00B) is necessary.
28 AMANT I AM antenna input AM antenna input. High impedance.
MPXREF 41kHz
AMDET
IC 2 FM MPX
IC1
CF202
IC 3
X901
EEPROM
10.25MHz
VDD
VCC
7 17 20 22 10 19 14 24 9 11 12 15 16 8 13
"Low" when the FM stereo signals are received.
To be pulled up to the "VDD" at 47kΩ.
"High" when signals are received. To be pulled up to the "VDD" at 47kΩ
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)
"High" when noise is received. Output for the RDS. GND at 47kΩ //1,800pF.
"High" when noise is received. Output for the RDS. GND at 36kΩ //330pF.
FM stereo "R-ch" signal output or AM audio output.
Add the specified de-emphasis constant.
FM stereo "L-ch" signal output or AM audio output.
Add the specified de-emphasis constant.
EEPROM write control. Writing permissible at "Low". Normally open.
SD bandwidth signal output. For detection of detuning data for the RDS.
Not used
Power supply pin for the digital section.
DC 5V +/- 0.25V. Be careful about overlapping noise in the logic section.
Grounding for the digital section.
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 (10k Ω + 39k Ω //4,700pF)
Data input/Data output
To be pulled up to the "VDD" at 47kΩ
Clock input To be pulled up to the "VDD" at 47kΩ
AF·RF chip enable. Active at "High" To be grounded at 47kΩ
Not used
Active at "Low". To be pulled up to the "VDD" at 47kΩ
Active at "Low". To be grounded at 47kΩ
Not used
FM composite signal output. r out < 100Ω
Analog section power supply pin.DC 8.4V +/- 0.3V
FM local high pin. When seeking local high, apply 5V together with "LOCL".
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.
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.
Grounding for the antenna section.
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 2.2kΩ) between the GND.
L ch
6
R ch
5
COMP
21
LDET
18
2 3 4 1
DEH-1400,14
49