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t
Playback of
Test cassette: 448 A
prerecorded
(3180 and 70 us)
tape
tape: Cr O, IEC Il new
reference tape
_ scanning
Test cassette: 448 A
Vout measured at test points
out = 308 mV + 0,5 dB
new)
play back reference level | D4 (1.ch.), D2 (r.ch.
- Dolby-NR off
315 Hz (250 pWb/mm)
als
aa
il
( 250 pWb/mm)
= 245mV+0,5 dB
- Playback start [>
O
tape A or tape B
z=
:
( 200 pWb/mm)
Tape select Cr (IEC fi
Dolby-level
setting
D1
ee
Adjustment: Tape A
left channel
R 225
right channel
R 226
Adjustment: Tape B
left channel
R 168
Frequency |
Test cassette: 448 A-
Drive mechanism A
Drive mechanism
A
left channel or
B 3 (R 187) B 4 (R 188)
right channel.
upper
Drive mechanism
B
Drive mechanism B
Assuming that bridges
If Vou from the ratio
B 5 (R 142), B 6 (C 101)
f , 250 Hz to f,, 12,5 kHz
or B 7(R 143) /B 8 (C 103)
out
D1 (I.ch.), D2 (r.ch.)
frequency response
DIN 45500
8.
HF-oscillator
|
tape B
8.1 HF-oscillator-
frequency
—
_- Insert cassette
Testpoint
§.-s—=i'(ar.:.._ | £ = 83 KHz + 10 kHz
- Tape select Cr
ee
oe
as
:
_
(IEC Il new)
- Record, pause
@
as
,
1 | Adjustment: L103
-——}
R 171
Frequency counter
Test circuit 3
42
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