Grundig GLM0150, Руководство по обслуживанию

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Abgleichvorschriften / Adjustment Procedures MS 4101
2 - 4 GRUNDIG Service
Cassette
Test equipment: Frequency Counter, Oscilloscope, Test Cassette 3150Hz/10kHz (z.B. 448)
Adjustment Preparation Adjustment Procedure
1.Bias Oscillator
2. Bias Voltage
3. Playback Level
4. Azimuth Deck 1
5. Azimuth Deck 2
6. Tape Speed
Frequency Counter to Testpoint
A
(JCW1-(5)).
Insert empty Cassette and start recording.
Insert empty Cassette in Deck 2 and start recording.
Left Channel: Oszilloscope to Testpoint
B
(JCW1-(1),
GND: JCW1-(6)).
Right Channel: Oszilloscope to Testpoint
B
(JCW1-(4),
GND: JCW1-(6)).
Insert Test Cassette in Deck 1 and play 3150Hz part.
Oscilloscope to Loudspreaker Outputs.
Oscilloscope to Loudspreaker Outputs.
Insert Test Cassette in Deck 1 and play 10kHz part.
Oscilloscope to Loudspreaker Outputs.
Insert Test Cassette in Deck 2 and play 10kHz part.
Frequency Counter to Loudspreaker Output.
Insert Test Cassette and play 3150Hz part.
Adjust JL1
a
for 105kHz
±
0.5kHz.
Adjust JSR2L
b
for 0.7V
rms
(2.0V
pp
)
±
0.1V.
Adjust JSR2R
c
for 0.7V
rms
(2.0V
pp
)
±
0.1V.
With JSR1L
d
adjust on the left channel the same level
as on the right channel.
With Head Screw
e
adjust for maximal and equal level
on both channels.
e
At Tape Direction >> adjust with Head Screw
f
for
maximal and equal level on both channels.
At Tape Direction << adjust with Head Screw
g
for
maximal and equal level on both channels.
f g
Adjust VSR1 (lower Front) for 3150Hz
±
0.1%.