Sharp SC-103H Service Manual page 14

Oscilloscope
RECORD mode
V.T.V.M
ERASE HEAD
Figure 35
1) Set Mode Selector Switch (SW-8) at "CASSETTE PLAY".
2) Then set the unit at RECORD mode.
3) Set R.ILF. Switch (SW-4) at "A".
4) Connect VTVM to Resistor (R408).
5) It is normal if VTVM's reading is then over 55mV.
4. LEVEL METER SENSITIVITY CHECK (Refer to Fig. 36)
Oscilloscope
CR. OSC
V.T.V.M
RECORD mode R/P HEAD
Attenuater
—-l0dB
100 ohm
Figure 36
1) Set Mode Selector Switch (SW-8) at "CASSETTE PLAY".
4) Set the unit at RECORD mode.
6) Adjust Semi-variable resistor (R119, R120) so that LEVEL meter indicates OVU.
'
5. RECORD AMPLIFIER SENSITIVITY CHECK (Refer to Fig. 37)
cCR.OSC
KHz RECORD mode
Attenuater
MIC or
LINE iN
Figure 37
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