Grundig UMS 2 - Page 30

Abgleich / Alignment UMS 1 / UMS 2
2 - 8 GRUNDIG Service
2. Cassette Deck
Measuring instruments/equipment:
Frequency counter, AF voltmeter, AF generator, distortion analyzer, wow and flutter meter,
Cr test cassette 448 A (part no. 35079-023.00), torque test cassette 456 (part no. 35079-014.00).
Layout of adjustment controls see page 2-10 .
Adjustment Preparations Adjustment Procedure
With adjustment control SVR106 set the frequency to
3150Hz ± 1%.
On START, the torque should be 25 to 70 x 10
-4
Nm
≈ 40g-cm.
Deviation < 0.13% (IEC wtd). Playback measuring time
≥ 30 seconds.
At 400Hz, the reference voltage measured at the test point
L. DOLBY or R. DOLBY is 0dB (ref).
At 19kHz, set the voltage level at test point L. DOLBY and
test point R. DOLBY to minimum (≤ -30dB) using F124
(left channel) and F224 (right channel) respectively.
The oscillator frequency should be 85kHz ± 1kHz .
Adjust with L401.
Erase current:
Cr.: 95mA ± 10% measured at R413 = 95mV ± 10%.
Fe.: 78mA ± 10% measured at R413 = 78mV ± 10%.
With the head adjustment screw 1 set the left or right
channel to maximum level.
Then connect the left channel in parallel with the right
channel. By minimum re-adjustment of the head adjustment
screw 1 set the output level to maximum.
Turn around the test cassette.
Tape direction: "Reverse"
Adjustment with head adjustment screw 2 is the same as
in the "Normal" tape direction.
R/PB-head
With SVR102 (left), SVR202 (right) set a playback level of
308mV ± 0.5dB.
(test points R./L. LINE OUT ≈ 950mV)
When using a test cassette with 200nWb/m set the play-
back level to 245mV ± 0.5dB.
(test points R./L. LINE OUT ≈ 750mV)
1. Tape speed
2. Take-up torque
on Start
3. Wow and flutter
4. MPX-filter
(19 kHz stereo
pilot tone)
5. Erase frequency
6. Erase current
7. Head gap angle
(Azimuth)
9. Playback level
Reference tape
scanning
(Dolby level)
≈
10k
10k
AUX
L
R
2
1
Frequency counter to test point L. LINE OUT or to test
point R. LINE OUT.
Insert test cassette 448 A,
play back 3150Hz.
Load the torque test cassette 456 einlegen.
Function: Start
Wow and flutter meter to test point L. LINE OUT or to R.
LINE OUT.
Load test cassette 448 A.
Play back 3150Hz.
AF-voltmeter to test point L. DOLBY (left channel) or to
test point R. DOLBY (right channel).
Connect AF-generator to AUX sockets.
V
in
= 50mV, f = 400Hz or 19kHz.
Insert a recordable cassette, Cr (IEC II)
in Deck B.
Function: AUX
Record-Pause
Dolby off
Frequency counter to test point L1 (R413).
Insert a recordable cassette, Cr (IEC II).
Function: Record-Pause
AF-voltmeter to test point L1 (in parallel with R413).
Insert a recordable cassette.
Function: Record-Pause
AF-voltmeter to test point L. LINE OUT or to test point
R. LINE OUT.
Insert test cassette 448 A.
Play back 10kHz.
The head adjustment screws are accessible by removing
the cassette compartment lid (with open cassette
compartment push the cover upwards).
AF-voltmeter to test point L. DOLBY (left channel) or to
test point R. DOLBY (right channel).
Insert test cassette 448 A.
Play back 315Hz (250nWb/m).
Dolby off
PLAYBACK
AUTOREVERSE
?
EJECT
RECORD
0
DOLBY B NR
1
2
Cassette
compart-
ment lid