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UMS 1 / UMS 2
Adjustment
9. Head current
AF-voltmeter to test point L. REC (left channel) or to test
(coarse)
point R. REC (right channel).
Connect AF-generator to AUX sockets.
V
= 50mV, f = 1kHz.
i
Switch the bias off by short-circuiting the base and emitter
of transistor T123 (OPT 1).
Insert a recordable cassette, Cr (IEC II).
Function: AUX
10.Head current
AF-voltmeter to test point L. DOLBY (left channel) or to
(fine)
test point R. DOLBY (right channel).
Insert a recordable cassette, Cr (IEC II).
Connect AF-generator to AUX sockets.
V
= 50mV, f = 400Hz.
i
Function: AUX
11.Bias voltage
AF-voltmeter with a 1:1000 capacitive voltage divider to
(coarse)
test point L. REC (left channel) or R. REC (right channel).
Insert a recordable cassette Fe or Cr.
Function: Record-Star
12.Frequency
AF-voltmeter to test point L. DOLBY (left channel) or to
adjustment
test point R. DOLBY (right channel).
during recording
Insert test cassette 448 A, side B (blank part) Cr (IEC II) or
similar tape.
Connect AF-generator to AUX sockets.
V
= 23mV, f
i
Function: AUX
13.Distortion factor
Connect AF-generator to AUX sockets.
V
= 500mV, f = 333Hz.
i
Insert test cassette 448 A,
side B (blank part) Cr (IEC II)
or similar tape.
Function: AUX
GRUNDIG Service
Preparations
Record-Start
Dolby off
Record-Start
Dolby off
–
Playback-Start
= 400Hz, f
= 12.5Hz.
1
2
Record-Start
Dolby off
–
Playback-Start
Record-Start
Dolby off
With SVR104 (left channel) and with SVR204 (right
channel) set to test points L. REC und R. REC 6.0mV.
L
10k
AUX
When recording on Fe IEC I-cassettes the voltage must be
R
4.5mV.
≈
10k
V
= 23mV at the test points L. DOLBY and R. DOLBY
o
during recording.
L
On playing back the recording made on the cassette
10k
AUX
recorder, a voltage level of 23mV ± 0.5dB must be present
R
at the test points L. DOLBY and R. DOLBY.
≈
10k
If the level differs from the value above re-adjust the head
current control SVR104 (left channel) or SVR204 (right
channel) during recording.
When recording on Fe IEC I-cassettes the voltage must be
23mV ± 1dB.
With Cr-cassettes, set the voltage level to 14.5mV at test
point L. REC or R. REC. with SVR103 (left channel) and
SVR203 (right channel)
With Fe-cassettes the voltage must be 12mV.
When playing back the recording the levels at the test
points L. DOLBY and R. DOLBY must not differ by more
than 0.5dB.
If V
f
to V
f
is higher than 0.5dB correct the bias.
o
2
o
1
L
10k
AUX
Re-adjust with SVR103 (left channel) or SVR203 (right
R
channel).
≈
10k
V
f
(12.5kHz)
o
2
V
f
(400Hz)
o
1
Distortion analyzer to test point L. LINE OUT or R. LINE
OUT (47kΩ termination).
L
Function: Playback-Start
10k
AUX
Dolby off
R
≈
10k
Distortion factor measured on playing back the recording
made:
Fe
IEC I
K
CrO
IEC II K
2
Abgleich / Alignment
Adjustment Procedure
= 0dB ± 0.5dB
≤ 1.5%
3
≤ 2.5%
3
2 - 9
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