Einstellvorschriften / Adjustment ProceduresCDM 700Einstellvorschriften / Adjustment ProceduresCDM 700
3. Tuner
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Measuring instruments: Signal Generator, DC Voltmeter, Oscilloscope.
Adjustment Procedures
AdjustmentPreparations Adjustment Process
1. CD-Section
1. AM IFCouple in a standard signal of 460kHz to T604 (ferriteAdjust T603 to maximum.
Measuring instruments: Oscilloscope
aerial) via a loop aerial. Ua as low as possible.
Note: Do not turn the variable resistor for laser power adjustment. The laser current is pre-set at the factory.
Oscilloscope to loudspeaker output.
Position of testpoints see page 3 - 7 "CD Board".
AdjustmentAdjustmentAdjustmentPreparationsPreparationsPreparations Adjustment Processs Adjustment Processs Adjustment Processs2. MW Oscillator MW f 531kHz, f 1602kHzAt fuou (531kHz) adjust to 1.0 + 0.1V with T605.
DC Voltmeter to testpoint AMVT .At f (1602kHz) adjust to 7.2 ? 0.1V with TC603.
o
Tracking EF BalanceTracking EF BalanceTracking EF BalanceConnect the Oscilloscope to testpoint TSO or Pin35 ofAdjust Adjust Adjust VR2VR2VR2 so that the graph is so that the graph is so that the graph is symmetricalsymmetricalsymmetrical to the 0-line to the 0-line to the 0-lineRepeat this adjustment.
IC2, ground to Vref or Pin3 of IC2.(Vref).(Vref).(Vref).
- Load a CD3. MW AerialMW 603kHz, MW 1404kHzAt 603kHz adjust to maximum with T604 (MW antenna coil
V1
- Close the CD doorbandpassCouple in a standard signal to T604 (ferrite aerial) via amove).
0 (Vref)
- CD Function: Play - Pauseloop aerial, (f = 1kHz, m = 30%).At 1404kHzmod adjust to maximum with TC602.
V2
- The button SKIP UP T is used to select the tracksOscilloscope to loudspeaker output.Repeat this adjustment.
successively (control VR2 can be adjusted during theV1 = V2
search process).
4. FM IFCouple in a standard signal of 98MHz to testpoint TP1. With T602 adjust to maximum .
Focus OffsetFocus OffsetFocus OffsetConnect the Oscilloscope to testpoint RF or Pin2 of IC2,Adjust Adjust Adjust VR1VR1VR1 to obtain a clear eye pattern as shown in the to obtain a clear eye pattern as shown in the to obtain a clear eye pattern as shown in theUa as low as possible.
ground to Vref or Pin 3 of IC2.diagram.diagram.diagram.Oscilloscope to loudspeaker output.
- Load a CD
- Close the CD doormax. (1.3V
- CD Function: Play ? 0.3V pp)5. FM Oscillator FM f 108MHz, f 87.5MHzAt fouo (108MHz) adjust to 6.3 ? 0.2V with L602.
DC Voltmeter to testpoint FMVT .Check at (fu 87.5MHz) 2.2 ? 0.2V.
6. FM AerialFM 90MHz, FM 106MHzAt 90MHzadjust to maximum with L601.
bandpassCouple in a standard signal to (FM ant.) testpoint TP1, At 106MHz adjust to maximum with TC601.
2. Cassette Deck2. Cassette Deck2. Cassette Deck(fmod = 1kHz, Df = 22.5kHz, Ua as low as possible). Repeat this adjustment.
Oscilloscope to loudspeaker output.
Measuring instruments/equipment:Measuring instruments/equipment:Measuring instruments/equipment: Frequency counter, AF-voltmeter, wow and flutter meter, Frequency counter, AF-voltmeter, wow and flutter meter, 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).Fe test cassette 449 (Part No. 35079-019.00), torque test cassette 456 (Part No. 35079-014.00).Fe test cassette 449 (Part No. 35079-019.00), torque test cassette 456 (Part No. 35079-014.00).
Position of testpoints see page 3 - 12 "Tape Board"
AdjustmentAdjustmentAdjustmentPreparationsPreparationsPreparations Adjustment Process Adjustment Process Adjustment Process
1. Tape speedConnect the frequency counter to the headphone socket. With adjustment control (in the
Insert the test cassette 449, play 3150Hz.cass.-motor) set the frequency
to 3150Hz ?3.15Hz.
T604
MOTORMOTORMOTORTP1
Ant.
L601
2. Take-up torque onInsert the torque test cassette 456.Tape tension on: Playback-Start = 35 - 80g-cm
StartFunction: Playback-Start.Fast Forward = 50 - 90g-cmTC601T603
Fast Rewind = 50 - 90g-cm
L602
3. Wow and flutterConnect the wow and flutter meter to the headphone Deviation < 0.3% (aurally compensated). Playback
socket. Insert test cassette 449, play 3150Hz.measuring time 3 30 seconds.
T602
1
4. Head gap angle Connect the AF-voltmeter to the headphone socket.With the head adjustment screw 1 set the
(Azimuth)Insert test cassette 449,left and right channel to maximum level.
play 8kHz.The levels of the two channels mustnotTC602J14
J13
differ by more than 3dB.FMVT
TC603 T605
5. Bias frequency Connect the frequency counter to TP4 (connector CN405).The oscillator frequency should be 65kHz ? 3kHz.MAIN BOARD
Insert a recordable cassette.Adjust with T401 (Tape Board).AMVT
Function: Record-Start.
6. Bias voltageConnect the AF-voltmeter via a 1:1000 capacitive voltageThe bias voltage is approx. 12V (measured with a 1:1000
divider to TP4 (connector CN405). Insert a recordablecapacitive voltage divider).
cassette.
Function: Record-Start
2 - 3GRUNDIG Service2 - 4GRUNDIG Service |
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