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PA 2 / PA 3
Adjustment
AF voltmeter to test point
11. AF head current
D2 (right channel).
adjustment during
Insert test cassette 448 A, side B (blank part), Cr IEC II or
recording
similar tape.
AF generator to Pin 2 and 4 of P106.
f = 400Hz.
Function: Dolby off, ALC off, Record-Pause
AF voltmeter to test point
12. Frequency
D2 (right channel).
adjustment during
Insert test cassette 448 A, side B (blank part) Cr IEC II or
recording
similar tape.
AF generator to Pin 2 and 4 of P106.
f
= 400Hz, f
1
Function: Dolby off, ALC off, Record-Pause
AF voltmeter with a 1:1000 capacitive voltage divider to
13. Bias voltage
test point
TP6 (right channel, head connector P101/2).
Insert a recordable cassette Fe or Cr.
Function: Record-Start
AF voltmeter to test point
14. Distortion factor
D2 (right channel).
Insert a recordable cassette, Fe or Cr tape.
AF generator to Pin 2 and 4 of P106.
f = 333Hz.
Function: Dolby off, ALC off, Record-Pause
Audioplatte
Audio Board
Logikplatte
Logic Board
GRUNDIG Service
Preparations
D1 (left channel) or test point
D1 (left channel) or test point
= 12.5kHz.
2
TP5 (left channel, head connector P101/5) or
D1 (left channel) or test point
R171
D1
D2
P106
R135
L
R
L
F102 F101
R
R136
ALC OFF
B407
With AF Generator output set the level at the test points
D1 and
D2 during recording to 75mV.
On playing back the recording made on the cassette
recorder, a voltage level of 75mV ± 0.5 dB must be present
at the test points
If the level differs from the value above re-adjust the head
current control R169 (left channel) or R182 (right channel)
during recording.
With AF Generator output set the level at the test points
D1 and
D2 during recording to U
When playing back the recording the levels at the test
points
D1 and
If U
f
to U
f
o
2
o
R245 left channel, or R246 right channel.
The bias voltage depends on the type of tape and the
frequency response setting.
Adjustment range:
Fe
= 10 - 15mV approx.
CrO
= 15 - 25mV approx.
2
With AF Generator output set the level at the test points
D1 and
D2 during recording to U
Distortion analyzer to Pin 5 of P106 (L) or Pin 1 of
P106 (R).
Function: Playback, Dolby off
Distortion factor measured on playing back the recording
made:
Fe
IEC I
CrO
IEC II K
2
R169
TP
3
L
F111
Aufn. Sperrkreis
F112
R
TP
4
C238
R182
R172
P101
TP
5
TP
6
8
Abgleichvorschriften / Adjustment Procedures
Adjustment Procedure
D1 and
D2.
= 13mV.
o
D2 must not differ by more than 0.5dB.
is higher than 0.5dB correct the bias with
1
= 245mV.
o
≤ 1.5%
K
3
≤ 2.0%
3
L
C205
C219
L
Bias Filter
R
C206
R
L1
P105
L111
Osz. Frequenz
B1
Osc. Frequency
B2
B3
B4
R482
Bandgeschwindigkeit
Tape Speed
2 - 6
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