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CF 11
Einstellvorschriften / Adjustment Procedures
11.Frequency
response on
Playback
12.AF head current
adjustment
during recording
13.Frequency
adjustment
during recording
14.Bias voltage
15.Distortion factor
AF-voltmeter to test point O D1 (left channel) or test point
© D2 (right channel).
Insert test cassette 448 A.
Play back the 250 Hz/12.5 kHz frequency recording on the
tape.
Dolby off
AF-voltmeter to test point © D1 (left channel) or test point
© D2 (right channel).
Insert test cassette 448 A, side B (blank part), Cr IEC Il or
similar tape.
AF-generator to LINE IN sockets.
V;= ca. 500 mV, f = 400 Hz.
Function: Record-Pause
Dolby off
Record-Start
Playback-Start
AF-voltmeter to test point © D1 (left channel) or test point
© D2 (right channel).
Insert test cassette 448 A, side B (blank part) Cr IEC Il or
similar tape.
AF-generator to LINE IN sockets.
f; = 400 Hz, fo = 12.5 kHz, V;= ca. 500 mV.
Function: Record-Pause
Dolby off
Record-Start
Playback-Start
AF-voltmeter with a 1:1000 capacitive voltage divider to
test point O TP5 (left channel, head connector P101/5) or
© TP6 (right channel, head connector P101/2).
Insert a recordable cassette Fe or Cr.
Function: Record-Start
AF-voltmeter to test point O D1 (left channel) or test point
© D2 (right channel).
Insert a recordable cassette, Fe or Cr tape.
AF-generator to LINE IN sockets.
f = 333 Hz.
Function: Record-Pause
Dolby off
Record-Start
Vofe (12.5 KHz) _
If the levels between Vf; (250 Hz) and Vofs (12.5 kHz) at
©D1 and © D2 differ by more than + 1.5 dB cut the bridges
B1 (C101), B2 (C103) left channel, or the bridges B3
(C102), B4 (C104) right channel.
=+14+0.50B
Vof; (250 Hz)
With the level control (RECORD LEVEL) set the level at the
test points © D1 and © D2 during recording to 120 mV.
On playing back the recording made on the cassette
recorder, a voltage level of 120 mV + 0.5 dB must be
present at the test points © D1 and © D2.
If the level differs from the value above re-adjust the head
current control R169 (left channel) or R182 (right channel)
during recording.
When recording on Fe IEC I-cassettes the voltage must be
120 mV + 1 GB.
With the level control (RECORD LEVEL) set the level at the
test points © D1 and © D2 during recording to V, = 20 mV.
When playing back the recording the levels at the test
points © D1 and © D2 must not differ by more than 0.5 dB.
If Vofo to Vof; is higher than 0.5 dB correct the bias.
Re-adjust with R245 left channel, or R246 right channel.
Vofo (12.5 kHz)
Vof; (400 Hz)
=0dB+0.5 dB
The bias voltage depends on the type of tape and the
frequency response setting.
Adjustment range:
Fe
= 10 - 15 mV approx.
CrOz
= 20 - 25 mV approx.
With the level control (RECORD LEVEL) set the level atthe
test points © D1 and © D2 during recording to Vo =
388 mV.
Distortion analyzer to LINE OUT L or LINE OUT R sockets
(47 kQ termination).
Function: Playback
Dolby off
Distortion factor measured on playing back the recording
made:
Fe
IECI
CrOz IEC Il
K3< 1.5%
Ky < 2.0%
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