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CF 21
Adjustment
11. Frequency
Connect the AF-voltmeter to test point
response on
and test point
Playback
Insert test cassette 448 A.
Play back the 315Hz / 12.5kHz frequency recording on the
tape.
Dolby off.
12. AF head current
Connect the AF-voltmeter to test point
adjustment
and test point
during recording
Insert test cassette 448 A, side B (blank part), Cr IEC II or
similar tape.
Connect the AF-generator to the
LINE IN sockets.
f = 400Hz, V
Function: Record-Pause
13. Frequency
Connect the AF-voltmeter to the test point
adjustment
channel) and to test point
during recording
Insert test cassette 448 A, side B (blank part) Cr IEC II or
similar tape.
Connect the AF-generator to the
LINE IN sockets,
f
= 400Hz, f
1
Function: Record-Pause
14.Bias voltage
Connect the AF-voltmeter via 1:1000 capacitive voltage
divider to
and to
respectively.
Insert a recordable cassette with Fe and Cr tape,
respectively.
Function: Record-Start
15. Distortion factor
Connect the AF-voltmeter to test point
and test point
Insert a recordable cassette, Fe and Cr tape, respectively.
Connect the AF-generator to the
LINE IN sockets.
f = 333Hz, V
Function: Record-Start
GRUNDIG Service
Preparations
D1 (left channel)
D2 (right channel) respectively.
D1 (left channel)
D2 (right channel) respectively.
≈
= 500mV.
i
Dolby off
–
Record-Start
–
Playback
D2 (right channel) respectively.
≈
= 12.5kHz, V
= 500mV.
2
i
Dolby off
–
Record-Start
–
Playback
TP 5 (left channel, head connector P102/1)
TP 6 (right channel, head connector P102/6)
D1 (left channel)
D2 (right channel) respectively.
= 500mV.
≈
i
Dolby off
If the levels between V
D1 and
D2 differ by more than + 1.5dB cut the bridges
B1 (C103), B2 (C107) left channel, or the bridges B3
(C104), B4 (C108) right channel.
V
(12.5kHz)
= +1 ± 0.5dB
o
V
(315Hz)
o
With the level control (RECORD LEVEL) set the level at the
test points
D1 and
On playing back the recording made on the cassette
recorder, a voltage level of 120mV ± 0.5dB must be
present at the test points
10 k
If the level differs from the value above re-adjust the head
10 k
current control R232 (left channel) and R233 (right channel)
LINE IN
respectively during recording.
When recording on Fe IEC I-cassettes the voltage must be
120mV ± 1dB.
D1 (left
With the level control (RECORD LEVEL) set the level at the
test points
D1 and
When playing back the recording the levels at the test
points
D1 and
If V
f
to V
f
is higher than 0.5dB correct the bias.
o
1
o
2
10 k
Re-adjust with R296 left channel, and R295 right channel
10 k
LINE IN
respectively.
V
(12.5kHz)
o
= 0dB ± 0.5dB
V
(400Hz)
o
The bias voltage depends on the type of tape and the
frequency response setting.
Adjustment range:
Fe
= 13 - 18V
CrO
= 21 - 26V
2
With the level control (RECORD LEVEL) set the level at the
test points
D1 and
Distortion analyzer to LINE OUT L and LINE OUT R
sockets respectively (47kΩ termination).
10 k
Function: Playback-Start
Dolby off
10 k
LINE IN
Distortion factor measured on playing back the recording
made:
Fe
IEC I
K
3
CrO
IEC II K
2
3
Einstellvorschriften / Adjustment Procedures
Adjustment Procedure
f
(315Hz) and V
f
(12.5kHz) at
o
1
o
2
D2 during recording to 120mV.
D1 and
D2.
D2 during recording to V
o
D2 must not differ by more than 0.5dB.
D2 during recording to V
= 388mV.
o
≤ 1.5%
≤ 2.0%
= 20mV.
2 - 5
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