Onkyo TX 890 Service Manual

Page 1

SERIAL NO. 3310

ONKYO SERVICE MANUAL

QUARTZ SYNTHESIZED
TUNER AMPLIFIER
MODELS TX-890/TX-890M

Black model

BHUD, BHUDNI MBIIUDN IZOV AC~ GOHZ I

MBHUWX I20/220V AC, 50,,60Hz I

SAFETYRELATED COMPONENT WARNING TABLE OF CONTENTS

COMPONENTS IDENTIFIED BY MARK A ON
THE SCHEMATIC DIAGRAM AND IN THE PARTS Specifications ....................... 2
LIST ARE CRITICAL FOR RISK OF FIRE AND

Service procedures .................... 3
ELECTRIC SHOCK. REPLACE THESE COMPO- E 1 d d r, ................ 4
NENTS WITH ONKYO PARTS WHOSE PART "P 0 E W

NUMBERS APPEAR AS SHOWN IN THIS Pans us: ------------------------- 5

MANUAL. Block diagram-Tuner section --------------- 6

MAKE LEAKAGE CURRENT OR RESISTANCE Wk diagramAmplmer mm) """"""" 7

- V ' ~ ............. 3

MEASUREMENTS To DETERMINE THAT EXPOSED [C IIGCI 445 d descrpm 8
PARTS ARE ACCEPTABLY INSULATED FROM Adjustment proceduref ------------------

THE SUPPLY CIRCUIT BEFORE RETURNING Pc board view/parts 11st ----------------- 21

THE APPLIANCE TO THE CUSTOMER. FM/AM me, .................... 21

Display/Operation switch ------- ~ : - . - - . '23

Prc. and power amplifier ------- . --------- 25

\ Tone control ..................... 25

Power supply ..................... 29

Volume/Volume indicator --------------- 30

Packing View ....................... 3]

ON KYO
Alllllll BflMPIIIIIIIIS

Page 15

TX-890

LC6527C-3802 (CODE CHAN GER)

0708
Buffer
U701 0754
Transmitter 2/ pmamp 333d EIUNSE
Infrared 6P1 U501 changer)
Rc-ilss
RC-AVQOM
X752
Ceramic oscillator
5; fi
l-osci n E] 05c;
}-rEst u 2] PD: -. POWER (Not used)
Vss [I E PD: -. PLAYER
T-RES E PD' _._. VOL UP To amp. circuit
(Groundmusrom -->PAa a 3) PDn -. VOL DOWN
STAND lav-4PM a E pm _. VOL 1ND (Not used)
man: 3] Pcz-- WE
(from mlcrupvooessor)SVSTEM IN-oPA: n E PC! -. mime
+Bt+5v)--vue a E PCo-> m
Connection diagram
Terminal No. Symbol Terminal Description

1 OSCl OSC Connect to the 4MHZ ceramic oscillator,

18 OSCZ

2 TEST TEST Test terminal. Connect to the ground,

3 Vss GND Ground terminal.

4 RES R_E-S Reset terminal.

5 PAO CUSTOM The custom code for decode is selected at this terminal. For this
model, the level is low.

6 PA] STANDBY Terminal for STANDBY detection, During low input, only the
POWER code is decoded.

7 PA2 REMOTE IN Signal input terminal from remote control preamp. Active low.

8 PA3 SYSTEM IN System code input terminal. Active high.

9 VDD +B(5V) Power supply terminal,

10 PCO SYSTEM OUT Output at this terminal are the custom code remote control code input
to REMOTE IN, the system code that has been converted correspond-
ing to the decoded data code.

ll PCl WI SENS Phono detection input terminal. Active low.

|2 PC2 RECEIVE This is the display output for remote control reception. Output is low
when decoded code is being received.

13 PC3 VOLIW During output of VOLUME UP/DOWN, a pulse (m; T:250ms)
is output.

[4 PDO VOL' DOWN When the volume DOWN code is input, a high pulse of lZOms is
output.

[5 PD] VOL UP When the volume UP code is input, a high pulse of l20ms is output.

[6 PD2 PLAYER Player control output terminal.

[7 PD3 POWER The power code input inverts the L/H. Level is high for power
being turned 0N.

_15__