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GRUNDIG Service
Abgleichvorschriften / Adjustment Procedures
RR 740 CD / RR 770 CD
CD Servo Board
Oscilloscope
to
testpoint TP3
(TSO) and ground of the
test probe to
testpoint TP1
(V. REF).
Oscilloscope
to
testpoint TP2
(RFOUT ) and ground of
the test probe to
testpoint TP1
(V. REF).
Insert Test-CD 5A and play track-number 5.
Oscilloscope
to
testpoint TP3
(TSO) and ground of the
test probe to
testpoint TP1
(V. REF).
Insert and play the CD. Press and hold down button
5
or
6
during the adjustment process.
Adjustment
Preparations
Adjustment Process
1. Tracking Offset
2. RF Level
3. Tracking Balance
Adjust to
0V
±
0.9mV
with
VR704
.
Adjust to
1.1V
pp
±
0.2V
with
VR701
.
With
VR702
adjust the
signal symmetrically
to the zero
line.
A=B
4. CD Part
Measuring instruments:
Oscilloscope, Test CD (e.g. 5A).
Function switch: CD
1.1V
pp
±
0.2V
A
B
0
DC
