Adjustment Procedures; Cassette Deck - Grundig RR 740 CD Bedienungsanleitung

Abgleichvorschriften / Adjustment Procedures

Adjustment Procedures

1. Cassette Deck

Measuring instruments/equipment: Frequency counter, AF voltmeter, Wow and flutter meter, Fe test cassette 3150Hz/8000Hz (e.g. 449).
Adjustment
1. Tape speed Connect the frequency counter to the headphone socket.
Insert test cassette, play 3150Hz.
2. Wow and flutter Connect the wow and flutter meter to the headphone
socket. Insert test cassette, play 3150Hz.
3. Head gap angle Connect the AF-voltmeter to the headphone socket.
(Azimuth) Insert test cassette, play 8kHz.
4. Bias frequency Connect the frequency counter to connector CN403A
Pin 2 / Pin 4 (GND).
Insert a recordable cassette.
Function: Record-Start.
Amplifier Board
2. DC/DC Converter
Measuring instruments/equipment: Frequency counter
Adjustment
1. Converter Frequency counter to testpoint
frequency
CPU Board
2 - 4
Preparations
Preparations
TP
62
With adjustment control (in the cassette motor) set the
frequency to 3150Hz
≤
Deviation
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
. Set the frequency to 2.7MHz
RR 740 CD / RR 770 CD
Adjustment Process
±
0.1%.
Bandgeschw.
Tape speed
0.35% (aurally compensated). Playback
±
0.5kHz with L401.
PIN 4
R.CH L.CH
1 4
PIN 2
Adjustment Process
±
0.1MHz with L103.
GRUNDIG Service
1