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