RR 620 CD / RR 650 CD
Einstellvorschriften / Adjustment Procedures
GRUNDIG Service
2 - 4
k
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.
Adjust RV101 to obtain a clear eye pattern as shown in the
diagram.
Adjustment
Preparations
Adjustment Processs
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
Focus Offset
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.
Connect the frequency counter to the headphone socket.
Insert the test cassette 449, play 3150Hz.
Insert the torque test cassette 456.
Function: Playback-Start.
Connect the wow and flutter meter to the headphone
socket. Insert test cassette 449, play 3150Hz.
Connect the AF-voltmeter to the headphone socket.
Insert test cassette 449,
play 8kHz.
Connect the frequency counter to TP6 (R/P head).
Insert a recordable cassette.
Function: Record-Start.
Connect the AF-voltmeter via a 1:1000 capacitive voltage
divider to TP6 (R/P head). Insert a recordable cassette.
Function: Record-Start
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
±
10kHz.
The bias voltage is approx. 10V (measured with a 1:1000
capacitive voltage divider).
1. Tape speed
2. Take-up torque on
Start
3. Wow and flutter
4. Head gap angle
(Azimuth)
5. Bias frequency
6. Bias voltage
Adjustment
Preparations
Adjustment Process
MOTOR
1
> 1Vss
