Grundig RR 710 CD - Adjustment Procedures

RR 710 CD / RR 750 CD Einstellvorschriften / Adjustment Procedures
GRUNDIG Service 2 - 4
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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 VR102 so that the graph is Symmetrical to the 0-line
(Vref).
Adjust VR101 to obtain a clear eye pattern as shown in the
diagram.
Adjustment Preparations Adjustment Processs
Connect the Oscilloscope to connector CN106/1 (TSO),
ground to CN106/3 (VREF).
- Load a CD
- Close the CD door
- CD Function: T or S (SEARCH)
Connect the Oscilloscope to connector CN106/2 (RFO),
ground to CN106/3 (VREF).
- Load a CD
- Close the CD door
- CD Function: PLAY
Tracking Balace
Focus Offset
0
(Vref)
V1
V2
V1=V2
>1V
0
Max.
DC Input
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