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PA 6
Adjustment
11.AF head current
AF-voltmeter to test point
adjustment during
D2 (right channel).
recording
Insert test cassette, side B (blank part), Cr IEC II or similar
tape.
AF-generator to AUX IN sockets, f = 400Hz.
Close wire bridge B407.
Function: Record-Pause
12.Frequency
AF-voltmeter to test point
adjustment during
D2 (right channel).
recording
Insert test cassette, side B (blank part) Cr IEC II or similar
tape.
AF-generator to AUX IN sockets, f
Close wire bridge B407.
Function: Record-Pause
13.Bias voltage
AF-voltmeter with a 1:1000 capacitive voltage divider to
test point
Insert a recordable cassette, Fe or Cr tape.
Function: Record-Start
14.Distortion factor
AF-voltmeter to test point
D2 (right channel).
Insert a recordable cassette, Fe or Cr tape.
AF-generator to AUX IN sockets, f = 333Hz.
Close wire bridge B407.
Function: Record-Pause
GRUNDIG Service
Preparations
D1 (left channel) or test point
Dolby off
–
≈
Record-Start
–
Playback-Start
D1 (left channel) or test point
= 1kHz, f
1
Dolby off
–
≈
Record-Start
–
Playback-Start
TP5 (left channel) or
TP6 (right channel).
D1 (left channel) or test point
Dolby off
≈
–
Record-Start
Set the input level during Record so that the voltage
measured at the test points
On playing back the recording made on the cassette
recorder, a voltage level of 120mV ± 0.5dB must be
present at the test points
If the level differs from the value above re-adjust the head
current control R169 (left channel) resp. R182 (right chan-
10 k
nel) during recording.
When recording on Fe IEC I cassettes the voltage must be
10 k
120mV ± 1dB.
AUX IN
Open wire bridge B407.
Set the input level during Record so that the voltage
measured at the test points
When playing back the recording the levels at the test
points
D1 and
= 12.5kHz.
If V
f
to V
f
is higher than 0.5dB correct the bias.
2
o
2
o
1
Re-adjust with C206 left channel, resp. C205 right chan-
nel.
10 k
V
f
(12.5kHz)
o
2
10 k
AUX IN
V
f
(1kHz)
o
1
Open wire bridge B407.
The bias voltage depends on the type of tape and the
frequency response setting.
Adjustment range:
Fe
=
8 - 12V
CrO
=
13 - 19V
2
Set the input level during Record so that the voltage
measured at the test points
Distortion analyzer to AUX OUT L or AUX OUT R sockets
(47kΩ termination).
Function: Playback
Dolby off
10 k
Distortion factor measured on playing back the recording
made:
10 k
AUX IN
Fe
IEC I
K
CrO
IEC II K
2
Open wire bridge B407.
Abgleichvorschriften / Adjustment Procedures
Adjustment Procedure
D1 and
D2 is 120mV.
D1 and
D2.
D1 and
D2 is 20mV.
D2 must not differ by more than 0.5dB.
= 0dB ± 0.5dB
D1 and
D2 is 388mV.
≤ 1.5%
3
≤ 2.0%
3
2 - 6
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