Teac AG 3000 AG 6000 AG 7000 Service Manual

Page 1

AG. 3000.6000.7000 '
SERIES
- ® ' AM-FM STEREO RECEIVER

SERVICE MANUAL

AG 3000 AG 6000 AG 7000

TEAC CORPMTION A 1 U.. DISTRIBUTR. IV I: TEAC CORPORATION OF AMERICA

7733 TELEGRAPH ROAD
MONTEBELLO, CALIFORNIA 90540
U.S.A.

1. SALES OFFICE: SHINJUKU BUILDING EUROPEAN DISTRIBUTOR: TEAC EUROPE N.V.
I I»8-T, NISHI-SHINJUKU, SHINJUKU, TOKYO KABELWEG 45-47, AMSTERDAM-W. 2,
HOLLAND

MA3000ET 00

PRINTED IN JAPAN 1071-8 009

Page 5

TUNER SECTION:

FM
Tuning Range:
Sensitivity:

Harmonic Distortion:

Signal to Noise Ratio:
Selectivity:

Capture Ratio:

Image Frequency Rejection:
IF Rejection:

FM Stereo Separation:
Spurious Response Rejection:
Spurious Radiation:

Antenna Input Impedance:

AM
Tuning Range:
Sensitivity(IHF):
Image Frequency Rejection:
IF Frequency Rejection:
Selectivity:
Power Requirements:

Power Consumption:
Dimensions and Weight:

ACCESSORIES

CONTINUED

88 to 108 MHz
1.4uV2t3 dB(20 dB quieting)
l . 8uV -_I- 3 dB(IHF)
Less than 0.5%
Better than 70 dB
Better than 60 dB
Less than 1 dB
Better than 90 dB
Better than 90 dB
Better than 38 dB
Better than 95 dB
15 dB

300 ohms, balanced
75 ohms, unbalanced

535 to 1,605 kHz

lOuV:t3 dB at 1 MHz

Better than 50 dB

Better than 80 dB

Better than 25 dB

100, 117, 220, 240V AC:

50/60 Hz

330W max.

16-1/4(w) x 4-3/4"(H) x 14"(D):
24.2 lbs, net

FM Ribbon Antenna, Pin plug, Shorting pin plug,

Polishing cloth

IFeatures and Specifications are subject to change without notice.

Page 21

TROUBLESHOOTING AG 6000 LATE MODEL

Poor FM sensitivity
Low INPUT meter indication

Poor FM sensitivity
Normal INPUT meter
indication

No output
INPUT and TUNING meter
indications are normal.

High sound range is abnormal

(FM)

Poor AM sensitivity

Loud hum or buzz in
AM reception

$11, 1
5...

F
ORIGINAL WIRING

When the antenna terminal voltage is approx-
imately 25dB - 30dB(0dB=luV) the normal INPUT
meter deflection will be about mid scale.

Low sensitivity may be caused by faulty sol-
dering of antenna terminal or a malfunction
of the IF circuitry transistors Q-201 - Q-203
or FM RF peripheral circuitry.

Q-206, IC(GA 7061?) or IF associated circuitry
is malfunctioning. Replace IC or repair asso-
ciated circuitry.

Defective Q-301 in multiplex circuit or muting
circuit.

De emphasis circuit is improperly set for re-
ceiving frequency of the area.

De Emphasis characteristic is 50 micro/sec for
Japan and Europe, 75 micro/sec for USA.

To convert the de emphasis circuit from 75
micro/sec to 50 micro/sec, leave out C-319 and
C-320 (0.0012uF).

To convert from 50 micro/sec to 75 micro/sec
reverse the above procedures.

Damaged or faulty Q-401(ZSK-14).

Replace Q-401. If replacement is required add
an external 10 ohm resistor in series to the
drain.

May be caused by strong AM field intensity,
flourescent lamps, or associated audio equipment.

If hum occurs remove filter capacitors C-002 and
C-003 (lSOOpF) from chassis ground, connect them
in parallel across power transformer primary

vwinding, or remove 0-002 and C-003 and connect a

0.01uF/500V capacitor across the power trans-
former primary winding.
See connection below.

Page 27

COMPONENTS LOCATION (CONTINUED)
AG 7000

AM TUNER BAR ANTENNA

' HEAT SINK

FM-IF-AMP
TUNING METER
INPUT METER
SWITCH
TAPE MONITOR

TOP VIEW

CONTROL AMP

FILTER SHITCH

SPEAKER SWITCH

FUSE POWER SUPPLHB)
PHONO AMP POWER SUPPLY (A)

BOTTOM VIEW