Jvc RX 80 Service Manual

Page 2

Contents

Specifications ......

59!?

Main Parts Locations .
3-(1) Top View . . ..
3-(2) Front View . . .

3-(3) Rear View . . . .
Removal Procedures. .

5-(1) FM/AM Tuner .

5-(2) Power Amplifier Idling Current ........

BlockDiagram .....

.«Ns»

Names of Parts and Their Functions .........

oooooooooooooooooo
nnnnnnnnnnnnnnnnnn
oooooooooooooooooo

4-(1) Removal Procedures of Power Transistors .
4-(2) Connection Diagram ...............
. Adjustment Procedures ..................

oooooooooooooooooo

. Exploded Views and Part Numbers ..........
Printed Circuit Board Ass'y and Parts List .....
8-(1) TFCs38Cl Tuner P.C. Board Ass'y ......
8~(2) TXX-402E] Power Amp P.C. Board Ass'y .

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10
10
13

1. Specifications

FM Tuner Section (Figures are based upon lHF Standard)

Tuning Range

Usable Sensitivity (IHF)

50 dB quieting Sensitivity
Mono
Stereo

Distortion
Mono
Stereo

: 87.5 MHz - 108.0 MHZ
: 10.3 dBf (1.8uV/300 Q)

:. 14.8 dBf (3 [JV/300 S2)
3 37.2 dBf (40pV/3OOSZ)

: 0.1% (1 kHz)

:.015% (1 kHz)

Signal to Noise Ratio (at 98 MHz, 80 dBf input)

Mono
Stereo
Selectivity

Capture Ratio

(80 dBf input)
IF Rejection
Image Rejection
Stereo Separation
AM Tuner Section
Tuning Range

Usable Sensitivity

Signal to Noise Ratio
Distortion
Selectivity

Amplifier Section
Output Power and Total
Harmonic Distortion

R-X80
No. 2605

: 70 watts

. 83 dB (IH F A-network weighted)

(74 dB, DIN)

: 74 dB (I H F A-network weighted)

(65 dB, DIN)

:75 dB, :l: 400 kHz

(60 dB, 300 kHz, DIN)

:1.5 dB

: 100 dB at 98 MHz
:80 dB at 98 MHz
:45 dB at1 kHz

:520 ~- 1710 kHz

(for 10 kHz step)
(522 - 1611 kHz for9 kHz step)

: 50 uV (External Antenna)

250 pV/m at 1000 kHz (999 kHz)

:50 dB at 100 mV/m
20.5% at 100 mV/m
:63 dBi 10 kHz

(60 dB :l: 9 kHz, DIN)

per channel, min.
RMS, both channels driven, into
8 ohms from 20 Hz to 20 kHz,
with no more than 0.008% total
harmonic distortion

80 (75) watts per channel, min.
RMS, both channels driven, into
8 ohms at 1 kHz with no more
than 0.7% (0.003%) total har-
monic distortion

8-(3) TDC-62Cl Display P.C. Board Ass'y ..... 16

8-(4) TAG-532A SEA Control P.C. Board Assy . 17

8-(5) TXX-403C] Pre Amp P.C. Board Assy . . . 19
8-(6) TPS-333C] Fuse, Power Supply &

AC Outlet P.C. Board Ass'y .......... 21

9. R-X80 Schematic Diagram ............... 22

9-(1) Tuner 8: Pre Amp Section ........... 22

9-(2) Power Amp & Power Supply Section . . 23

9-(3) Logic Control Section .............. 24

10. Packing Materials and Part Numbers ......... - 25

11. Accessories List ....................... 25

12. Parts List with Specified Numbers for
Designated Areas .................. back cover
13. Channel Spacing .................. back cover

safety.

Warning: When replacing the parts marked with A ,
be sure to use the designated parts to ensure

Input Sensitivity/l mpedance

Phono
Tape Play

SEA control
Center Frequency

Control Range

MC

: 250 pV/100 $2

MM : 2.5 mV/47 k9
: 240 mV/50 k9
(240 mV/50 k9, DIN)

:63 Hz,
16kH2
::I: 12 dB

250 Hz,

1 kHz, 4 kHz,

Signal to Noise Ratio
(IHF short-circuited
A-network)

:Phono (MM) 77 dB

(IHF A-202 80 dB)
Tape Play 98 dB
(IHF A-202 75 dB)

Design and specifications subject to change without notice.

Power Specifications

Line Voltage Power
Areas .
8: Frequency ConsumptIon
U.S.A. & Canada AC 120 V,60 Hz 315 Watts 415 VA
Europe AC 220 V~50 Hz 500 Watts
Australia 81 U.K. AC 240 V~50 Hz 500 Watts
Other Areas AC 110/120/220/
240 V~Selectable, 500 Watts
50/60 Hz
Dimensions and Weight
Model Height Width Depth Weight
R-X80 117 mm 435 mm 370 mm 19.5 kg
(4-19/32") (17-1/8") (14-9/16") (20.9 lbs)

Features: Touch button UP/DOWN volume control
The volume, which is conventionally control-
led manually, is controlled by the rotation of
the DC motor.

Page 4

O TAPE-1 MONITOR switch

Press to listen to or monitor a tape deck connected to

the TAPE-1 terminals or the TAPE-1 DIN socket; the

TAPE-1 indicator lights. Press this again to listen to the

source selected with the source selectors; the indicator

will go out.
0, 3, ®-, ® Source selectors (VIDEO/AUX, PHONO,
FM, AM)

VIDEO/AUX: Press to listen to sources connected to the

rear panel VIDEO/AUX terminals.

PHONO: Press to listen to records on a turntable con-

nected to the rear panel PHONO terminals.

FM: Press to switch on the FM tuner section.

AM: Press to switch on the AM tuner section.

0 TAPE indicators

These indicators correspond to the TAPE MONITOR

switches and light when you are monitoring or listening

to tape recordings. If you press both TAPE-1 MONITOR
and TAPE-2 MONITOR switches simultaneously, these
indicators show only TAPE-1.

Note: When listening to the source selected by source
selector, make sure that the TAPE indicators are
off.

0 Source indicators (AUX, PHONO, FM, AM)
One of these lights when the correSponding source is
selected.

we UP/DOWN TUNING button

Auto tuning

Up-scanning button I > )1 When this button is pressed,

beeps will be heard and the tuned frequency changes in

the direction of increasing frequencies. Use this button
to search the upper frequency broadcast? Scanning

(Auto Tuning) stops automatically when the next FM

(or AM) station is pulled in. This tuned-in fr'equency is

displayed digitally by the frequency indicator.

Down-scanning button ( 4 )2 Press to tune in the direc-

tion of decreasing frequencies. Use this button to search

the lower frequency station. Functions are identical with
those of the up-scanning button.

Note: When the upper or lower frequency limit of the
band is reached, scanning starts in the opposite
direction. If you continue to press the scanning
button when the upper 6r lower frequency limit of
the band has been reached, scanning will stop.
When this button is held pressed, scanning does
not stop even if there are stations.

If one of these buttons is pressed right after the
AM or FM source select button, the tone of the
beep will differ.

Manual tuning

Manual tuning is used when the station required is too

weak to be received by auto tuning. Press the MODE/

SCAN switch ®. Now pressing either of the scanning

buttons changes the frequency in predetermined steps

(see "13. Channel Spacing" on back cover). Tapping this

button changes the tuned frequency step by step, con-

tinuous pressing (more than 0.6 sec.) changes tuning to
high speed scanning sequence which stops when the
button is released.

Note: When manual tuning is used, it does not automati-
cally reverse the direction of scanning when the
upper or lower frequency limit- of the band is
reached.

Channel spacing

An AM channel spacing switch (U.S.A., Canada and

other areas models) is provided on the rear panel for

selecting 9 kHz or 10 kHz steps according to the channel

RaX80
No. 2605

Spacing in your area. To change AM channel spacing, set
the POWER switch to the STANDBY position (.I.)
then change the position of the AM channel spacing
switch.
For details, see "13. Channel Spacing" on back cover.
0 Frequency indicator
The tuned-in frequency is displayed digitally. Four
digits (kHz) are displayed for AM reception and five
digits (MHz) (for Europe, UK, Australia and other
countries) or four digits (MHz) (for U.S.A., Canada) are
displayed for FM reception.

O MEMORY button
When this button is pressed, the MEMORY indicator
lights. If the station select button is pressed while this
indicator is lit, the frequency of the station being
received is diSplayed and becomes preset to that channel.
When the station select button is pressed after this indi-
cator goes out, the frequency of the previously preset
station is displayed on the frequency indicator. In that
case, perform tuning once again and press the MEMORY
button.

Cb MEMORY indicator
When the MEMORY button is pressed, this MEMORY
indicator lights to show that the unit is ready to register
the preset station in memory. This indicator will go out
automatically in about 10 sec. or when you press the
station select button.

@ Station select buttons/station indicators
These buttons are used to select one of the preset
stations or to preset the station for an individual channel.
For presetting, press one of these buttons while the
MEMORY indicator remains lit after the MEMORY
button has been pressed. Then the station which is being
received will be stored in memory. One of the STATIONS
indicators will light to show which channel is in opera-
tion.
Each- of the station select buttons can be used for one
FM station and one AM station. When the MEMORY
indicator is not lit, press one of these buttons, a beep
will be heard, to receive the station held in memory.
Notes:
0 Do not leave preset channels unoccupied as this may

cause mistuning.

Do not press the MEMORY button and'the preset

button at the same time. Be sure to release the

MEMORY button and then press the preset button.

When storing a frequency in memory, a beep is not

heard when the station select button is pressed.

® Station select button window
This window can be removed by lifting up the release
lever and pulling it toward you. Put the provided station
(frequency) identifier sheet from the back and the each
station (frequency) corresponding to the station select
button will be indicated.

O FM STEREO indicator
This lights when an FM stereo broadcast is tuned in.

® SIGNAL strength indicator
This is used in tuning to both FM and AM broadcasts.
The more the number of lamps that light, the stronger
the signal being received.

CDOUTPUT POWER LEVEL indicator
These indicate the output power level.