GRUNDIG Service
UMS 3000
2 - 2
Adjustment Procedures
Tuner
Test equipment: Signal Generator, Oscilloscope, Digital Voltmeter
Adjustment
Preparation
Adjustment Procedure
1. MW Oscillator
2. AM IF
3. MW Pre Stage
4. FM Oscillator
5. FM Pre Stage
Digital Voltmeter to Q505 Collector.
Couple Signal Generator via Loop Antenna.
f = 450kHz; no modulation
Digital Voltmeter to IC501(-19).
Couple Signal Generator via Loop Antenna.
no modulation
Digital Voltmeter to IC501(-19).
Digital Voltmeter to Q505 Collector.
Signal Generator to Aerial Input;
Ue ~ 25dB
µ
V; f
mod
= 1kHz; deviation = 40KHz;
Oscilloscope to CN501(-1) or CN501(-3).
At 1620kHz adjust T503 for 7.6V
±
0.6V.
Adjust T501 for maximum.
Adjust alternating with MW COIL (T502) at 612kHz and
with VC502 at 1404kHz for maximum.
At 108,0MHz adjust (bend) L501 for 7.2V
±
0.4V.
Adjust alternating with L502 (bend) at 90.1MHz and with
VC501 at 106.1MHz for AF Maximum.
Tape Deck
Test equipment: Oscilloscope, Frequency Counter, Fe Test Cassette 3150Hz/10kHz (e.g. 449)
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 60kHz
±
300Hz.
Alignment Layout Tape Deck
Motorpoti
Alignment Layout Tuner
