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4. SOUND CARRIER
Adjustment Parts
Checking Point
L190
• Connection Method
L104
L105
GND
SIGNAL
GENERATOR
• Adjustment Procedure
1) Supply +12V to pin No. 1, and GND to pin No. 2 of P102
Supply +5V to pin No. 3, and GND to pin No. 1 of P101
2) Connect the signal generator output to pin 3 and GND to pin 2 of 102.
3) Connect the oscilloscope to pin NO.15 of IC102.
4) Adjust L108 to obtain the minimum Noise, minimum Level of pin NO.15 of IC102.
Measuring Equipment
IC102 #15
minimum
noise
level
#2
P102
#3
L108
L101
TP1
Z101
L103
TP2
IC101
#2
OUT
Condition of Adj.
Oscilloscope
Signal Gen.
PIF PCB (Component Side)
P101
L109
TP3
TP4
L110
TP6 TP7
fc: 38.9MHz, fm: 15.625KHz (30% AM Modulation)
Output level: 80dBµV (75Ω loaded)
8
Input Signal
Refer to the
EE Mode
followings
CH-1
Oscilloscope
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