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GRUNDIG Service
Abgleichvorschriften / Adjustment Procedures
RR 740 CD / RR 770 CD
Adjustment Procedures
1. Cassette Deck
Measuring instruments/equipment:
Frequency counter, AF voltmeter, Wow and flutter meter, Fe test cassette 3150Hz/8000Hz (e.g. 449).
Connect the
frequency counter
to the
headphone socket
.
Insert test cassette, play
3150Hz
.
Connect the
wow and flutter meter
to the
headphone
socket
. Insert test cassette, play
3150Hz
.
Connect the
AF-voltmeter
to the
headphone socket
.
Insert test cassette, play
8kHz
.
Connect the
frequency counter
to connector
CN403A
Pin 2 / Pin 4
(GND).
Insert a recordable cassette.
Function: Record-Start.
With adjustment control (in the cassette motor) set the
frequency to
3150Hz
±
0.1%
.
Deviation
≤
0.35%
(aurally compensated). Playback
measuring time
≥
30 seconds.
With the head adjustment screw
1
set the
left and right channel to
maximum level
.
The levels of the two channels must not
differ by more than 3dB.
Set the frequency to
63kHz
±
0.5kHz
with
L401
.
1. Tape speed
2. Wow and flutter
3. Head gap angle
(Azimuth)
4. Bias frequency
Adjustment
Preparations
Adjustment Process
1
Bandgeschw.
Tape speed
2. DC/DC Converter
Measuring instruments/equipment:
Frequency counter
Frequency counter
to testpoint
TP
.
Adjustment
Preparations
Adjustment Process
1. Converter
frequency
Set the frequency to
2.7MHz
±
0.1MHz
with
L103
.
Amplifier Board
CPU Board
PIN 4
PIN 2
R.CH
L.CH
1
4
TP
