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Use 1: 1000 (e.g. CK 5)
Cr: setting 16,5 V=0dB
Measurement
test
9.3 Bias voitage:
- Insert cassette
meee
mt
adjustment
Cr, Fe and Me
capacitative voltage divider to
(16,5 V measurement
switching factors.
tapes one after the
test at recording measurement:
1:1000 = 16,5 mV) |
Setting:
R 103 (left channel)
R 203 (right channel)
Switching factors
compared to Cr:
Fe:-3,8dB+0,5dB ©
(approx. 11,5 mV)
Me: +2,3dB+0,5 dB
(approx. 21,5 mV).
K1 (left channel) wire head plug
1A2 or K2 (right channel) wire
head plug 1A5
4
K1
K2
other record, start
each.
- Start with Cr.
- Dolby NR off.
CK5
Test circuit 5
10. MF- head cur-
rent tape B
(Head voltage)
Tum the left-and right
10.1 MF- head cur-
a.Record
f=315 Hz
Vin : Test circuit 6
02
Ve
Vout: Test circuit 2
Adjust R 101 (left channel)
and R 201 (right channel)
so that the level 120 mV is
the same at boh test
points when playing back
the recording (i!there is a
difference to 120 mV itis
possible to change the
head current).
Playback under point
b. Playback , start
10.1a made recording
Tum the LEVEL feft/nght
10.2 MF-head cur-
a. Record
f=315Hz
rent setting
- Insert Cr-test cas
V in = approx. 57 mV
and MASTER CONTROL
(Head voltage)
sette 448, (blank tape
+1,5dB
to maximum.
record / playback
section) side B
Adjust the inputvoltage
2. possibility
Cr, IEC il(S 4592 A)
so that 245 mVineasured at
test points O2 (eft chan-
or insert an equalized
nel) or D2 (rightchannel).
tape
- Dolby NR off
- Record, start
Playback the jut made
recordigs such hat 245 mV
measured at tet points
O02 and D2.
If the value camot be
accomplished, i is neces-
sary to adjust the headcur-
rent regulators ¢ the
R 101 left- andre 201
right channels oy recording
accordingly, in «der to
achieve the sane current
value of 245 mVon the test
points O2 or Déby recor-
ding and playbak.
Playback under point
10.1a. made recording
b. Playback, start
c. MF-head current
constant value level
switching factors
Cr.....0dB
Fe.....4,5dB+0,5 dB
Me.....0,1dB+0,5 dB
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