Daewoo DR-C912B, Service Manual

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34
ADJUSTMENT OF THE TAPE TRANSPORT SECTION
K. ADJUSTMENT OF THE AUDIO AZIMUTH
a. Connect the AUDIO output JACK with an AUDIO LEVEL
METER.
b. Play back the ALIGNMENT TAPE(DN-2:MONOSCOPE 7KHz
Signal).
c. Check if the AUDIO output signal level is over : -9 ~-3dBm.
d. If the requirement of c is not satisfied, readjust the AZIMUTH
SCREW of the AC HEAD until the AUDIO output is
maximum.(Fig. 5.4)
e. Repeat the process of Adjustment of the wave form of
DRUM Entrance/ExitÓ
L. X-POSITION
a. Connect the PT01 on the MAIN CIRCUIT BOARD with a PATH
ADJ. FIXTURE.
b. Play back an ALIGNMENT TAPE(DN-2 : MONOSCOPE Signal).
c. Connect the S/W PULSE TEST PIN on the PATH ADJ. FIX-
TURE with a CHANNEL-1 SCOPE PROBE.
d. Connect the VIDEO OUT on the MAIN CIRCUIT BOARD with a
CHANNEL-2 SCOPE PROBE (1V/div).
e. Check if the ENVELOPE is maximum when the VR CONTROL
on the PATH ADJ. FIXTURE is in CENTER
f. If the requirement e is not satisfied, readjust the X-POSITION by
referring to subitem E (Adjustment of the X-POSITION).
g. Repeat the process of subitem F (PLAYBACK PHASE
ADJUSTMENT).
AUDIO OUTPUT AUDIO OUTPUT JACK
AUDIO LEVEL METER
Test Point
Measurement Equipment
S/W PULSE TEST PIN PATH ADJ. FIXTURE
ENVELOPE TEST PIN PATH ADJ.FIXTURE
Measurement Equipment OSILLOSCOPE
VR CONTROL
PATH ADJ.FIXTURE
S/T GUIDE ROLLER TAPE TRANSMISSION T SECTION
Test Point
Adjustment