Teac A-6100 User manual

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CONTENTS
1. GENERAL DESCRIPTION . 1
2. SPECIFICATIONS . 2,3
3. TOOLS FOR TESTING AND MAINTENANCE . 4
4. TEAC TEST TAPE -YTT SERIES- . '5
5. TAPE TRANSPORT PARTS LOCATION . 6
6. PARTIAL DISASSEMBLY . 7
7. LINE VOLTAGE AND FREQUENCY CONVERSION . 11
8. HEAD ALIGNMENT . 12
9. MEASUREMENT AND ADJUSTMENT -MECHANICAL- . 14
10. A-6100 ELECTRICAL ADJUSTMENT -GENERAL NOTICE- . 19
11. MEASUREMENT AND ADJUSTMENT -ELECTRICAL- . 20
12. A-6300 ELECTRICAL ADJUSTMENT -GENERAL NOTICE- . 31
13. MEASUREMENT AND ADJUSTMENT -ELECTRICAL- . 32
14. SERVICING AND MAINTENANCE ... 42
15. LIST OF LINE VOLTAGE AND FREQUENCY (Hz) USED AROUND THE WORLD. 44
16. TEAC DECIBEL TABLE . 45
17. TROUBLESHOOTING .46,47
18. LEVEL DIAGRAMS . 49,50
NOTE
When placing an order for parts, please refer to the PARTS LIST
and PRICE LIST FOR PARTS which are printed separately from this
manual.
1. File the PARTS LIST manual together with this SERVICE MANUAL;
future TECHNICAL INFORMATION SHEETS should also be kept with these.
2. Use the PARTS LIST manual and the PRICE LIST FOR PARTS when
ordering replacement parts from TEAC Corp.

1. GENERAL DESCRIPTION
The TEAC A-6100/A-6300 is an excellent home entertainment stereo tape deck,
built to semi-professional standards with 3 motors, 4 heads, two (selectable)
meter scale ranges, and completely push-button controlled operation. Accepts
either 7" or 10-1/2" reels, and has tape speeds of 3-3/4 ips and 7-1/2 ips
(A-6300) or 7-1/2 ips and 15 ips (A-6100). Special features include switch-
selected Bias and Equalization; two Line Input and two Line Output jacks
per channel; facilities for (optional) remote/timer controlled operation;
and special features for the A-6100 such as 4-Track playback; MIC ATT; and
choice of 0.3 V or 0.775 V "0 VU" level at the OUTPUT jacks.
Although the A-6100/A-6300 internally appears to be similar to other TEAC
models (esp. A-4300), significant differences require consulting this manual
before any attempt to service the deck. This A-6100/A-6300 Service Manual/
Parts Manual contains adjustment and alignment information, part replacement
reference, and other information about obtaining new parts.
If adjustments or repair procedures are not sufficiently clear or seem too
difficult to accomplish, or for more detailed technical information, you may
contact the nearest TEAC Distributor, a TEAC affiliated subsidiary corporation,
or the TEAC Corporation. TEAC addresses are found at the back of this manual.
FEATURE COMPARISON CHART A-6100:: A-6300
Tape Speed (ips) 15. 7K
VA. 3X
Automatic Reverse play
NO YES
Counter Repeat (Playback)
NO YES
Memory ADT0-ST0P
YES
NO
Mic Attenutor
YES
NO
Peak Level Indicators
YES
NO
Flip Open Head Housing
YES NO
0 VD Marker for OUTPUT
YES
NO
Playback Track Selector
YES
NO
Output Level Selector
YES
NO
Other minor design changes were also incorporated for specific
differences in parts and circuitry please consult the Parts List
and Schematic Diagrams.
DIMENSIONS
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- 1 -

2-1. SPECIFICATIONS
ELECTRICAL
ELECTRICAL
A-6100
FREQUENCY RESPONSE: Overall from recording INPUT to playback OUTPUT
lSlps ••• 40Hz'v26kHz ±3dB
7-l/2ips ••• 40Hz'v24kHz ±3dB
(Measured at 20 dB below the Specified Level)
INPUT IMPEDANCE: a) MIC: lOkfl (600SPvl0kQ)
b) LINE:50kO
OUTPUT LOAD IMPEDANCE: a) LINE: approx. 0.3V/10kO
b) HEADPHONE: 0.3mW/8fi
0.775 V/10kS2
EQUALIZATION:
15ips •• NAB 50psec. 3180psec.
7-l/2ips •• NAB 50psec. 3180psec.
INPUT LEVEL:
OUTPUT LEVEL:
BIAS FREQUENCY.:
a) MIC: -70dB±!dB (0.25mV) min.
b) LINE: -8dB (308m V) -18dB SdB (97mV) min.
c) DIN: -38dB ±2dB min.
a) OUTPUT: -8dB, OdB selector
b) HEADPHONE: -24dB±SdB(4.9mV)
c) DIN: -8dB
100kHz (±5kHz; Push-pull oscillator)
CHANNEL SEPARATION:
45dB or more, channel to channel at 1kHz
ERASE EFFICIENCY: 65dB or more
A-6300
FREQUENCY RESPONSE: Overall from recording INPUT to playback OUTPUT
7-l/2ips ••• 40Hz't24kHz ±3dB
3-3/4ips ••• 40Hz , vl6kHz ±3dB
(Measured at 20 dB below the Specified Level)
INPUT IMPEDANCE: a) MIC: 10kQ (600S2vL0kSO
b) LINE:50kS2
OUTPUT LOAD IMPEDANCE: a) LINE: approx. 0.3V/10kR
b) HEADPHONE: 0.3mW/8fl
EQUALIZATION: 7-l/2ips •• NAB 50psec. 3180psec.
3-3/4ips •• NAB 90psec. 3180psec.
INPUT LEVEL:
OUTPUT LEVEL:
a) MIC: -7OdB SdB (0.25mV) min.
b) LINE: -8dB (308mV) -18dB SdB (97mV) min.
c) DIN: -38dB ±2dB min.
a) OUTPUT: -8dB -2dB±$dB(610mV) max.
b) HEADPHONE: -24dB±SdB(4.9mV)
c) DIN: -8dB -2dB±IdB max.
BIAS FREQUENCY.:
CROSSTALK REJECTION:
CHANNEL SEPARATION:
ERASE EFFICIENCY:
100kHz (±5kHz; Push-pull oscillator)
45dB or more, adjacent track at 125 Hz
50dB or more, channel to channel at 1kHz
68dB or more
- NOTE -
Value of "dB" in the test refer to 0 dB=0.775V, except where
specified. -If a Test Set or an AC VTVM calibrated to 0 dB =
IV is to be used, appropriate compensation should be made.
Refer to the TEAC DECIBEL TABLE on page 45 to obtain conversion
of millivolts to dB should your meter not have a dB scale.
- 2 -

2-2. SPECIFICATIONS
MECHANICAL A-61QO
TYPE:
HEADS:
REEL SIZE:
a) 2 track 2 channel stereophonic
b) 2 track 2 channel monophonic
c) 2 track 1 channel monophonic
Erase head x 1, Record head x 1, 2-T Playback x l
4-T Playback x 1
10-1/2" maximum NAB reel
TAPE SPEED:
15ips (38cm/s), 7-l/2ips (19cm/s)
MOTORS:
WOW AND FLUTTER:
6-pole eddy current motors for reel drive x 2
4/8 pole hysteresis synchronous motor
for capstan drive x l
0.15% at 15ips (RMS)
0.18% at 7-l/2ips (RMS)
Wow and flutter measured according to unweighted
(RMS) NAB standard using TEAC YTT-2004/2003 flutter
free tape. Above value is measured during play¬
back.
FAST WINDING TIME: Approx. 140 seconds or less with 1800 ft tape
OPERATING POSITION: Horizontal or vertical
POWER REQUIREMENT: DM : 100V/50Hz, 60Hz
EX : 100, 117, 220, 240V/50Hz, 60Hz
TCA: 117V/60Hz
* TCA models for TEAC CORPORATION OF AMERICA
POWER CONSUMPTION: DM: 90W, EX: 122W, TCA: 122W
WEIGHT:
22 Kg net
MECHANICAL A-6300
TYPE:
HEADS:
REEL SIZE:
a) 4 track 2 channel stereophonic
b) 4 track 2 channel monophonic
c) 4 track 1 channel monophonic
Erase head x 1, Record head x 1 , Playback head x 2
10-1/2" maximum NAB reel
TAPE SPEED:
7-l/2ips (19cm/s), 3-3/4ips (9.5cm/s)
MOTORS: 6-pole eddy current motors for reel drive x 2
4/8 pole hysteresis synchronous capstan motor x 1
WOW AND FLUTTER: 0.18% at 7-l/2ips (RMS)
0.20% at 3-3/4ips (RMS)
Wow and flutter measured according to unweighted
(RMS) NAB standard using TEAC YTT-2002/2003 flutter
free tape. Above value is measured during play¬
back.
FAST WINDING TIME: Approx. 160 seconds or less with 1800 ft tape
OPERATING POSITION: Horizontal or vertical
POWER REQUIREMENT:
POWER CONSUMPTION:
WEIGHT:
DM : 100V/50HZ, 60Hz
EX : 100, 117, 220, 240V/50HZ, 60Hz
TCA: 117V/60HZ
* TCA models for TEAC CORPORATION OF AMERICA
DM: 101W, EX: 135W, TCA: 135W
22 kg net
- 1 -- NOTE -----
As a result of continuing changes and improvements during the pro¬
duction run, minor difference may be found between early and later
machines.
Refer to TEAC TECHNICAL INFORMATION sheet for information concerning
modifications.
- 3 -

3. TOOLS FOR TESTING AND MAINTENANCE
A minimum of the following tools and test instruments are required
for measuring and adjusting to obtain optimum performance.
Regular maintenance tools will be adequate for those not listed
here. If any test instrument listed here is not available, a close
equivalent can be used.
SPRING SCALE . 0^4 kg (CK8 lbs), 0V300 g (O'VLO ozs)
FLUTTER METER . Meguro Denpa Co., Model MK665B (preferred)
or Sentinal Co., Model FL-3D-1.
DIGITAL COUNTER . Range - 0 Hz^lOO kHz
BANDPASS FILTER.TEAC Model M-206A (1 kHz)
VTVM. Hewlett-Packard Co., Model 4302B
OSCILLOSCOPE . . General purpose
BLANK TAPE . TEAC YTT-8013 and YTT-8003
TEAC TEST TAPE. Refer to the next page
EMPTY REEL . TEAC RE-702 (2" hub) and RE-701 (4" hub)
RE-1002 10-1/2" reel
TEAC TEST SET*.M-826A
* Use of the TEAC M-826A Test Set is recommended. This set incorporates
an AC VTVM, Audio Oscillator, Channel Selecting switch. Variable Atte¬
nuator, Monitor Speaker and Cables.
TEAC M-826A measures the EMS value of the Voltage (0 dB = 0.775V).
Characteristics of this Test Set are similar to the standard VU-meter.
Fig. 3-3 Spring Scale
-4

4. TEAC TEST TAPE -VTT SERIES -
- PLAYBACK ONLY -
TEAC-YTT Series Test Tapes are designed for aligning and checking
the playback system performance of any tape recorder. They have
been manufactured to be within close tolerance to the NAB Stand¬
ard, and the recorded signal format has been arranged for maximum
convenience during test procedures.
YTT-l002/1003/1004 (FOR PLAYBACK ALIGNMENT)
TYPE
YTT-l 002
YTT-l 003
YTT-l 004 REMARKS
TITLE
PLAYBACK ALIGNMENT
TAPE
WIDTH
1/4 INCH
BASE
1 MIL
1 MIL
1-1/2 MIL
TAPE SPEED(ips)
3-3/4
7-1/2
15
Accuracy: 0.2%
Wow and Flutter: 0.1%(WRMS)
RECORD TRACK FULL TRACK
Azimuth Angle Tolerance:
90°±1.5 *
RECORDING
STANDARD
NAB
CHARACTER¬
ISTICS
TIME
CONSTANT
(vs)
3180+90
3180+50 3180+50
TOLER¬
ANCE
WITHIN
0.5dB
31.5-4KHz
31.5-lOKHz
31.5-16KHz
WITHIN
1 dB
8K-14KHZ 12.5KHz-20KHz
18K-22KHZ
SECTION
FREQUENCY (Hz)
USE
YTT-l002
YTT-l003
YTT-l004
1
400
400 400
* OdB 30s
Operating Reference
Level Calibration
2
7,500
15,000
15,000
-lOdB
60s
Azimuth Alignment
400
400
400
RECORDED
SIGNAL
3
14,000
12,000
10,000
8,000
6,300
4,000
2,000
1,000
500
250
125
80
63
40
31.5
20,000
18,000
16,000
12,000
10,000
6,000
4,000
2,000
1,000
500
250
125
80
63
40
31.5
22,000
20,000
18,000
16.000
12,500
10,000
6.300
4,000
2,000
1,000
500
250
125
80
63
40
31.5
15s
each
Frequency Response
Check
* OdB recording level is 6dB below the 3% T.H.D. level
YTT-2002/2003/2004 (FOR TAPE SPEED AND WOW-FLUTTER TESTING)
TYPE YTT-2002 YTT-2003
YTT-2004
REMARKS
TITLE
TAPE SPEED AND FLUTTER TSET
TAPE
WIDTH
1/4 INCH
BASE
1 MIL
1 MIL
1-1/2 MIL
TAPE SPEED(ips) 3-3/4
7-1/2
15
WOW AND FLUTTER
' 0.07% 0.05% 0.03%
Weighted RMS
RECORDED WIDTH
FULL TRACK
RECORDED
SIGNAL
FREQUENCY
3,000Hz
LEVEL
-5dB
OdB: Operating
Reference Level
TIME
7 MINUTES
Since these tapes will be your own reference standard, care should
be exercised, in handling and storage, not to expose them to any
magnetic flux which might deteriorate or completely destroy the
recorded signals. High temperature and humidity are also harmful
to the tape.
- 5 -

5. TAPE TRANSPORT PARTS LOCATION
Right-
Reel Motor
Brake Solenoid —
Capstan Solenoid
Flywheel -
Control —
PC.Board
Fuse Holder
Left Reel Motor
— Brake Solenoid
(
-Cl 6
— Freq. Selector
SW 50Hz^60Hz
Fig. 5-1 Tape Transport Parts Location
NOTE
For ordering parts, refer to the exploded view of the
PARTS LIST. An accompanying listing provides the correct
part numbers.
- 6 -

Fig. 6-1 Rear Panel and Bottom Plate Fig. 6-2 Wood Sides
Most amplifier checks and adjustments can be made from the bottom
with the plate removed.
These adjustments should be performed by experienced technicians,
and then only when going through the complete test and check pro¬
cedures on the unit which is being tested.
HEAD ASSEMBLY REPLACEMENT - -
To change the head assembly as a unit, remove the 4 mounting
screws. Note the positions of the wires on the circuit board
before unsoldering. Solder wires of the new assembly in ex¬
actly the same positions. Refer to Fig. 8-3 Head Wiring Section.
Fig. 6-3 Head Assy Removal

REMOVAL OF CAPSTAN MOTOR
1. Remove the 3 screws holding the
capstan motor.
2. Unsolder the 6 wires connecting
the capstan motor.
3. Remove the 4 screws holding the
capstan motor. Watch for the
Rubber Cushions.
4. Loosen the 2 set screws (hex
head) in pulley and lift off
pulley.
- NOTE -
Clean the drive belt with TZ-261B
and the motor pulley and capstan
flywheel with TZ-261A.
Be sure to note the color code of the
wires so you can replace them correctly.
Fig. 6-4 Capstan Motor Removal
REMOVAL OF CAPSTAN ASSEMBLY -
1. Unscrew capstan cover (front
panel).
2. Remove 2 screws from rear bracket,
allow bracket to drop toward floor
of case.
3. Remove capstan belt.
4. Loosen 2 screws in capstan ass'y
flywheel. Remove flywheel.
5. Remove 3 screws in capstan ass'y.
6. Gently move capstan ass'y up and
down until it slides out of panel.
Fig. 6-5 Capstan Assy Removal
- 8 -