Abgleichvorschriften / Adjustment Procedures
RR 640 CD / RR 670 CD
2 - 3
GRUNDIG Service
Adjustment Procedures
1. Cassette Deck
Measuring instruments/equipment:
Frequency counter, AF-voltmeter, wow and flutter meter, e.g. Fe test cassette 449.
Connect the
frequency counter
to the
headphone socket
.
Insert e.g. test cassette 449, play
3150Hz
.
Connect the
wow and flutter meter
to the
headphone
socket
. Insert e.g. test cassette 449, play
3150Hz
.
Connect the
AF-voltmeter
to the
headphone socket
.
Insert e.g. test cassette 449,
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
±
1kHz
with
L401
.
1. Tape speed
2. Wow and flutter
3. Head gap angle
(Azimuth)
4. Bias frequency
Adjustment
Preparations
Adjustment Process
PIN 4
PIN 2
Bandgeschw.
Tape speed
1
