Adjustment; Fm Discriminator; Voltage Of Covering; Tuning Level (Db) Adjusment - Hitachi HTA-DD3E Service Manual

HTA-DD3
A D J U S T M E N T S

1) FM Discriminator

Measuring instrument and condition.
Input terminal
FM antenna
1kHz, 60dBu,
22.5kHz dev.
2) Voltage of covering (Reference)
Band Destination
FM E/EBS
(50kHz step)
W/WUN/WAU
(50kHz step)
AM E/EBS
(9kHz step)
W/WUN/WAU
(9kHz step)

3) Tuning level (dB) adjusment

Input – FM antenna, 1 KHz, 26 dBµV, 75 KHz
Adjust – VR1
Limit – 26±2dB
(NOTE) Adjust VRI until "Tuned" Indicator light on.
Output terminal Measuring instrument
* R22 DC balance meter
* R22
Frequency Specification
87.50MHz
108.00MHz
87.50MHz
108.00MHz
522kHz
1,611kHz
522kHz
1,611kHz
Frequency
98.1 MHz
DC balance meter
Limit(V) Average(V)
1.3-3.7 2.4
6.0-9.0 7.5
1.3-3.7 2.4
6.0-9.0 7.5
0.9-1.2 1.1
6.0-9.0 7.5
0.9-1.2 1.1
6.0-9.0 7.5
– 8 –
Adjust Reading
T4 0±30mV
Note