MASQ RRCD 9100 PLL
Abgleichvorschriften / Adjustment Procedures
GRUNDIG Service
2 - 2
Adjustment Procedures
Tuner
Test equipment: Signal Generator, Oscilloscope, Digital Voltmeter
Adjustment
Preparation
Adjustment Procedure
1. LW Oscillator
2. MW Oscillator
3. AM IF
4. LW Pre Stage
5. MW Pre Stage
6. FM Oscillator
7. FM Pre Stage
Digital Voltmeter to Testpoint TP7.
Digital Voltmeter to Testpoint TP7.
Couple Signal Generator via Loop Antenna.
f = 450kHz; no modulation
Digital Voltmeter to Testpoint TP5.
Couple Signal Generator via Loop Antenna.
no modulation
Digital Voltmeter to Testpoint TP5.
Couple Signal Generator via Loop Antenna.
no modulation
Digital Voltmeter to Testpoint TP5.
Digital Voltmeter to Testpoint TP7.
Signal Generator to Aerial Input;
Ue ~ 25dB
µ
V; f
mod
= 1kHz; deviation = 40KHz;
Oscilloscope to CN501(-1) or CN501(-3).
At 281kHz adjust T502 for 6.7V
±
0.2V.
At 1620kHz adjust T501 for 8.2V
±
0.2V.
Adjust T509 for maximum.
Adjust alternating with LW COIL at 153kHz and with
VC503 at 261kHz for maximum.
Adjust alternating with MW COIL at 558kHz and with
VC502 at 1440kHz for maximum.
At 108,0MHz adjust (bend) L502 for 7.0V
±
0.2V.
Adjust alternating with L501 (bend) at 88.0MHz and with
VC501 at 106.0MHz for AF Maximum.
Tape Deck
Test equipment: Oscilloscope, Frequency Counter, Test Cassette 3150Hz/10kHz (e.g. 448A)
Adjustment
Preparation
Adjustment Procedure
1. Tape Speed
2. Azimuth
3. Bias Frequency
Frequency Counter to Loud Speaker.
Play Test Cassette (3150Hz part).
Oscilloscope to Loud Speakers.
Play Test Cassette (10kHz part).
Frequency Counter to CN401(-1) or CN401(-3).
Start recording.
Adjust Motorpoti to 3150Hz
±
10Hz.
With head screw
A
adjust for
maximal and equal level in both
channels.
A
With L401 adjust for 62kHz
±
300Hz.
Alignment Layout Tuner
Alignment Layout Tape Deck
Motorpoti
