Adjustment - Kenwood VT-183 Service Manual

VT-183
To obtain the best performance, periodically calibrate the
unit. Sometimes, only one mode need to be calibrated, while
at other times, all modes should be calibrated. When one
mode is calibrated, it must be noted that the other modes
may be affected. When calibrating all modes, perform the
calibration in the specified sequence.
The following calibration requires an accurate measuring
instrument and an insulated adjusting flat blade screwdriver.
If they are not available, contact your dealer. For optimum
adjustment, turn the power on and warm up the scope suffi-
ciently (more than 30 minutes) before starting.
Before calibrating the unit, check the power supply voltage.
TEST EQUIPMENT REQUIRED
The following instrument or their equivalent should be used
for making adjustment.
Test Equipment
Digital Multimeter
Frequency Counter
Oscilloscope
Calibrator
CR Oscillator
Attenuator
Q-Meter
Distortion Meter
Insulation Meter
50Ω Termination
ITEM ADJUSTMENT POINT
300mV range
8

ADJUSTMENT

Model Maker
DL-712 KENWOOD
FC-756 KENWOOD
CS-6010 KENWOOD
5100B FLUKE
AG-203 KENWOOD
RA-920 KENWOOD
4343B YHP
885 Shibasoku
SM-5 TOA
TA-57
KENWOOD
VR102
Oscillator or calibrator
Oscillator
(Unless otherwise specified, the above connection should be used as to the follow-
ing items.)
RANGE: 300 mV
1) Input 1 kHz (or 400 Hz), 300 mVrms sine wave, and set the pointer to 3.0 of the
0-3 scale. Check that the variable range is less than 98% and more than 102%
with respect to 3.0 (full-scale).
2) Waveforms shown on the oscilloscope shall not be deformed.
PREPARATION FOR ADJUSTMENT
Control Settings
The control settings listed below must be used for each
adjustment procedure.
Exceptions to these settings will be noted as they occur.
After completing adjustment, return the controls to the fol-
lowing settings.
NAME OF KNOBS
RANGE
RELATIVE REF
PROCEDURE
Main unit
CAL
OUT OUT
IN OUT
Calibrator
50Ω oscillator
OK NG
POSITION
AUTO
CAL
Oscilloscope
NG