Marantz TT-6000 - Electronic Adjustment

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ELECTRONIC ADJUSTMENTS
Follow alignment sequence for electronic adjustments
H below.
A. Supply Voltage Verification
B. Phase Lock Alignment
C. Wow and Flutter Alignment
SUPPLY VOLTAGE
Connect a digital voltmeter to Power Supply Board
Pins and verify DC voltages.
A. Pin 17-(Ground) C. Pin 15(~—12VDC)
B. Pin 20-(+12VDC) OD. Pin 14-(+5VDC)
PHASE LOCK ALIGNMENT
A. Adjust crystal oscillator VC1 trimmer by mon-
itoring (Pin 13) IC-3 for:
33RPM - 22500 + 2 Micro-Secs (44.44Hz)
45RPM - 16666 + 2 Micro-Secs (60.00Hz)
B. Connect a dual trace scope to (Pin 13) IC-3 and
(T.P.) collector X1. Superimpose wave forms
and adjust VR4 and VR5. Refer to Figures
below.
33RPM - 14.0 + 0.4 M Secs. with VR4
45RPM - 11.0 + 0.4 M Secs. with VR5
14.7 0.4 ms
) 1C3-13
T.P. (33 RPM)
T.P. (45 RPM) |
| 11.2.0.4 ms
WOW AND FLUTTER ALIGNMENT
It is recommended to align wow and flutter circuit by
both methods (meter alignment), (scope alignment)
below.
WOW AND FLUTTER METER ALIGNMENT
A. Connect a wow/flutter meter to the amplifier
output and adjust VR1-Motor Control Circuit
Board for minimum reading.
B. Adiust VR2 and VR3-Motor Control Circuit
Board alternately to minimize flutter.
WOW AND FLUTTER SCOPE ALIGNMENT
A. Connect a dual trace scope (Pins 3, 8 Motor
Control Circuit Board) and superimpose wave
forms. Reference Figures below.
B. Adjust VR1 for amplitude and VR3 and VR4
for 90° phase difference.
NOTE: The Turntable must be level for all wow
and Flutter adjustments.
{INCORRECT
DRIVE
WAVEFORM
difference
CORRECT
DRIVE
WAVEFORM
90° PHASE
CIRCUIT WAVEFORMS
b—a|
33RPM-22.5mSec
45RPM-16.66mSec
COLLECTOR }-.—____——-om
33RAPM-22.5mSec
45APM-16.66mSec
33RPM-22.5mSec
45RPM- 16.66rmS ec
PAT Av Aes fe.
IC3-8
—
33RPM-22.5mSec
45RPM-16.66mSec
] | | | 5.0¥
1C3-13
33RPM-22.5mSec
45 RPM-16.66mSec
33RPM-4.0V
45RPM-4.3V
X11, 13
EMITTER
33APM-1I3mSec
45RAPM-83mSec
PINS 4,7 ad
33RPM-113mSec
45RPM-83mSec