Sanyo VHR-490 Service Manual page 12

A1-14805(N) 1/2
2-3. AUDIO CIRCUIT ADJUSTMENT
.
Before making these adjustments, (especially, the tape
guide height and audio control erase head height adjust-
ments) should be carried out, so that the tape traveling
between the loading guide pole and the audio control
erase head runs without fluttering, twisting, curling.
2-3-1. TEST EQUIPMENT AND STANDARDS REQUIRED
.
Before making these adjustments, Section 2-1. SERVO
and Section 2-2. VIDEO circuit adjustments should be
carried out.
Oscilloscope
AC Voltmeter
Frequency Counter
Blank Tape
Vertical sensitivity :10 mV/DIV
Band width : more than 30 MHz
Effective value indication
Input frequency :10 HZ -20 kHz
Input Impedance : more than 1 MQ
Measurement level : lmV (full scale)
Input frequency :20 Hz -10 MHz
VHS-tvDe cassette taDe
2-3-2. LOCATION OF ADJUSTMENT POINTS
P1BZS1OOC-A1
IC231
"---:VR233
TP233c@: ~-FO
.....
VR234 : ~ ';
o
R-FO i.-.'
TP;34
n
TP211
TP2?2
(GND)
@
..-...
VR201
BIAS
AD-1 PWB (FOIL SIDE) Fig. 2.3.1
.
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