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RR 620 CD / RR 650 CD
Adjustment Procedures
1. CD-Section
Measuring instruments: Oscilloscope
Note: Do not turn the variable resistor (laser power adjustment). The laser current is pre-set at the factory.
Alignment scheme see page 2 - 3.
Adjustment
Focus Offset
Connect the Oscilloscope to testpoint TP4 (RF or Pin31
of IC101), ground to TP2 (VC or Pin 48 of IC101).
- Load a CD
- Close the CD door
- CD Function: PLAY
2. Cassette Deck
Measuring instruments/equipment: Frequency counter, AF-voltmeter, wow and flutter meter,
Fe test cassette 449 (Part No. 35079-019.00), torque test cassette 456 (Part No. 35079-014.00).
Alignment scheme see page 2 - 3.
Adjustment
1. Tape speed
Connect the frequency counter to the headphone socket.
Insert the test cassette 449, play 3150Hz.
2. Take-up torque on
Insert the torque test cassette 456.
Start
Function: Playback-Start.
3. Wow and flutter
Connect the wow and flutter meter to the headphone
socket. Insert test cassette 449, play 3150Hz.
4. Head gap angle
Connect the AF-voltmeter to the headphone socket.
(Azimuth)
Insert test cassette 449,
play 8kHz.
5. Bias frequency
Connect the frequency counter to TP6 (R/P head).
Insert a recordable cassette.
Function: Record-Start.
6. Bias voltage
Connect the AF-voltmeter via a 1:1000 capacitive voltage
divider to TP6 (R/P head). Insert a recordable cassette.
Function: Record-Start
GRUNDIG Service
Preparations
Preparations
Einstellvorschriften / Adjustment Procedures
Adjustment Processs
Adjust RV101 to obtain a clear eye pattern as shown in the
diagram.
Adjustment Process
With adjustment control (in the
cass.-motor) set the frequency
±
to 3150Hz
0.1%.
Tape tension on: Playback-Start = 35 - 65g-cm
Fast Forward = 50 - 120g-cm
Fast Rewind = 50 - 120g-cm
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 mustnot
differ by more than 3dB.
The oscillator frequency should be 60kHz
The bias voltage is approx. 10V (measured with a 1:1000
capacitive voltage divider).
> 1Vss
MOTOR
1
±
10kHz.
2 - 4
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