Onkyo TX-800 User manual

TX-800
SERIAL No. 3329
ONKYO SERVICE MANUAL
QUARTZ SYNTHESIZED
TUNER AMPLIFIER
MODEL TX-800
Black model
BHUD, BHUDN

TX-800
SPECIFICATIONS
AMPLIFIER SECTION
Power output:
Musical Power Output:
Continuous Power Output:
Total Harmonic Distortion:
IM Distortion:
Damping Factor:
Frequency Response:
RIAA Diviation:
Sensitivity and Impedance:
Phono Overload (MM):
Signal-to-Noise Ratio:
Tone controls:
35 watts per channel, min, RMS, at 8ohms, both channels driven, from 40Hz to 20kHz, with
no more than 0.3% total harmonic distortion.
2x85! watts at 4ohms, 1kHz (DIN)
2x65 watts at 8ohms, 1kHz (DIN)
2x45 watts at 4ohms, 1kHz (DIN)
2x40 watts at 8ohms, 1kHz (DIN)
0.3% at rated power
0.1% at 25 watts output
0.3% at rated power
0.1% at 25 watts output
35 at 8ohms
20-30,000Hz ±1dB
20 -20,000Hz ±0.8dB
Phono: 2.5mV/50 kohms
CD: 150mV/50 kohms
Tape Play: 150mV/50 kohms
Tape Rec: 150mv73.5 kohms
120mV RMS at 1kHz, 0.3% THD.
Phono: 85dB (at 10mV input, Aweighted)
75dB (IHF A-202)
CD/Tape: 95dB (A weighted)
80dB (IHF A-202)
Bass: ±10dB at 100Hz
Treble: ±10dB at 10kHz
TUNER SECTION
FM:
Tuning Range:
Usable Sensitivity:
50dB Quieting Sensitivity:
Capture Ratio:
Image Rejection Ratio:
IF Rejection Ratio:
Signal-to-Noise Ratio:
Alternate Channel
Attenuation:
Selectivity:
AM suppression Ratio:
Harmonic Distortion:
Frequency Response:
Stereo Separation:
Muting Level:
AM:
Tuning Range:
Usable Sensitivity:
Image Rejection Ratio:
IF Rejection Ratio:
Signal-to-Noise Ratio:
Harmonic Distortion:
GENERAL
Dimensions (W xHxD):
Weight:
-220V/240V/ Worldwide models-
87.50 -108.00MHz (50kHz steps)
87.50 -108.00MHz (50kHz steps) or
(1 00kHz steps) (Worldwide model)
Mono:
Stereo:
Mono:
Stereo:
1.5dB
85dB
90dB
Mono:
Stereo:
12.4dBf, 1.2/xV, 75ohms
1.2/i,V (S/N 26dB, 40kHz Devi.)
75ohms DIN
19.2dBf,2.5)LtV,75ohms
25/xV (S/N 46dB, 40kHz Devi.)
75ohms DIN
18.2dBf,2.2/xV,75ohms
38.2dBf, 22/LtV, 75ohms
70dB
65dB
50dB DIN (±300kHz, 40kHz dev.)
50dB
Mono: 0.15%
Stereo: 0.30%
30-15,000Hz±1.5dB
40dBat1kHz
30dB at 100-1 0,000Hz
17.2dBf,4/xV
522 -1611 kHz (9kHz steps)
522 -1611 kHz (9kHz steps) or
530 -171 0kHz (1 0kHz steps) (Worldwide model)
30/xV
40dB
40dB
40dB
0.8%
435 x115 x320mm
17-1/8" x4-1/2" x12-9/16"
5.7kg., 12.6 lbs.
-120Vmodel-
87.5 -108.0MHz (1 00kHz steps)
Mono: 12.4dBf,2.3AtV
Stereo: 18.2dBf,4.5/aV
Mono:
Stereo:
1.5dB

TX-801
SERVICE PROCEDURES
1. Replacing the fuses
For continued protection against fire hazard,replace
only with same type and same rating fuse.
D(120V) model
Circuit no. Part no.
F901 252049
G(220V) and Q(240V) models
Circuit no. Part no.
F902 252071
W(Worldwide) model
Circuit no. Part no.
F901 252049
F902 252071
Description
4A(ST-6),Primary
Description
1.25A-SE-EAK,Primary
Description
4A(ST-6),Primary
1.25A-SE-EAK,Primary
2.Safety-check out
(Only U.S.A. model)
After correcting the original service problem,perform
the following safety check before releasing the set to
the customer.
Connect the insulating-resistance tester between the
plug of power suuply cord and nickel screw on the back
panel.
Specifications: 3.3Mohm ±10% at 500V.
5. Changing the band step
With the exception of the models below, aBAND STEP
selector switch is not provided.
(FM)
MODEL

TX-800
5
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AS

TX-800
IC BLOCK DIAGRAM AND DESCRIPTIONS
Q705
LC6538D-3984 (Micro processor)
MEMORY SHIFT
OIODE MATRIX
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LOCAL
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DIRECT
SEL
AUTO/ MONO
PHONO
0702 SERIAL IN
M&
0703
CODE
CHANGE
MUTE
SW PROTECT
IN/OUT
TERMINAL^
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0511
0107
PLL P. F
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FRONT
END 0104 FM/AM IF
0201
MPX MUTE
SW
Pin No.

TX-801
Pin No.

TX-800
FM50K (FM

Q107
LM7001 (PLL synthesizer and controller)
TX-800
SYCO^A-
XINo^
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>Phase Detector
Charge Pump
—*-£>o~ —Reference Divider
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Tfr AProgramable Divider
1' &u n
—oPD1
<&>PD2
Shift Register •Latch
CE CL DATA W<M
nsx 9
,12. •VDD1
H£oVDD2
>V5S
Pin No.
1
10
11
12
13
14
15
16
Terminal
XOUT
XIN
CE
CL
DATA
Description
Connect to the 7.2 MHz crystal oscillator.
Chip enable terminal. Connect to the PLL terminal of micro processor.
Serial clock input terminal. Connect to the CLOCK terminal of microprocessor.
Serial data input terminal. Connect to the DATA terminal of microprocessor.
SYN
BOl
B02
B03
AMIN
FMIN
VddI
Vdd2
PD1
PD2
Vss
Not used.
Not used.
FM control signal output terminal. "L" when FM.
AM control signal output terminal. "L" when AM.
AM local oscillator input terminal.
FM local oscillator terminal.
Power supply terminal for back-up.
Power supply terminal.
Charge pump output of the phase detector which constitutes the PLL. High level is output when the
divided local oscillator frequency is high than the reference frequency.
In the opposite case, low level is output. Floating occurs when the frequencies matched.
The output is applied to the variable capacitor diode in the local oscillator through the low pass
filters.
Ground terminal.
-9-

TX-800
Q324
LC7821 (Analog switch)
(I)Lio-
(2)L20-
(3)L30-
(4)L40-
(5)LCOMIO-
(6)L5o-
(7)L60-
(8)UC0M2O-
(9)L70~
(I)L8o-
(II)LC0M3<>-
(19) Vooo-
(16) Vss °-
(I2) VEe
(18) RES
(17) So-
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ILEVEL SHIFT I
L—3E
—
o-^O rE f? SHIFT REGISTOR -<^—0
-ORI (30)
-OR2 (29)
-OR3 (28)
-OR4 (27 )
-ORC0MK26 )
-OR5 (25)
-OR6 (24)
-ORC0M2( 23)
-OR7 (22)
-0R8 (21)
-ORC0M3(20)
>DI (14 )
>CL (15 )
>CE (13)
Serial data composition