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11.
11.2
Frequency
responce
check
Distortion
factor tape B
When red
LED is just going
out at a level of
200 pWh/mm,
max. level.
External-and
noise voltage
tape B
a. Record
Vin = approx. 500mV
Insert Cr-test cas-
+1,5dB
sette 448,
side B, (blank tape
section
Cr, fEC Il(S 4592 A)
or comparable tape
Dolby NR off
MPX-Filter off
Record, start
Test circuit 6
fy =315Hz
fo= 14 kHz
Playback under point
. Plaback , start
11. 1a made recording.
Insert cassette
Cr, IEC Il (S4592 A)
Me, IEC IV (E 912 BH)
Fe, IEC | (R 732 DG)
f =333 Hz
V in = approx. 500 mV
- Tum the MASTER CON-
TROL to maximum.
Adjust the LEVEL so that
the left or right red + 3 dB
level indicator just goes
out, i.e. 260 mV +0,5 dB
at test point O2 or D2.
Insert Cr-, Fe-, Me-
cassette
Channels are mea-
sured individualy
- Dolby NR off
- Record, start
- Recording playback
- Dolby NR off
- Insert the CR-, Fe-
and Me cassette in
succession
- Playback, start.
- Insert cassette
-Dolby NR off/on
- Record, start.
- sort:
Cr
Fe
Me
Vin
:
Vin: Test circuit 6
Vout : Test circuite 1
- Vin: Test circuit 6
- Vout! Test circuit 2 (record)
- Vour: Test circuit 1, (see up)
1350 mV+ 1 dB
LINE OUT level to
maximum.
Tape: Cr
external voltage effective
curve A effective
tape: Fe
external voltage effective
curve A effective
Line|
Turn the left-and right
LEVEL controls to
maximum. Set the
MASTER CONTROL-
controls such that Voy; =
245 mV measured at test
points O2 (!.ch.) and D2
(r.ch.) resp. atf , = 315 Hz
- Reduce Vj, from the test
signal generator by 20 dB.
Vey
315 Hz
Vv t2
14 kHz
= 0,5 dB to
1,5 dB
lf V5 1 compared with Vito
is greater than 1,5 dB, re-
adjust using R 103 (left
channel) and R 203 (right
channel)
Tolerance zone of
frequency response
DIN 45500 to restricted
+3dB.
250 Hz
Distortion factors:
Cr:K3<3,5%
Fe:K3<2%
Me:K3<3%
Dolby
off >52dB
Dolby
Bon >55dB
Dolby
Con >57dB
>55dB
> 63dB
> 69dB
Dolby
off
Dolby Bon
Dolby C on
> 48dB
> 54dB
> 56dB
Dolby
off
Dolby Bon
Dolby C on
Doiby
off >51dB
Dolby
Bon >61dB
Dolby
Con >67dB
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