ADJUSTMENT
TUNER SECTION
fL:
fH:
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Frequency | Frequency | Display |
| Setting/ | Instrument |
|
|
|
| Adjusting | Connection |
|
|
|
| Parts |
|
AM IF | 450 kHz | 1,602 kHz |
| T351 | *1 |
|
|
|
|
|
|
AM Band | — | 531 kHz |
| (fL): T306 | *2 |
Coverage |
|
|
| 1.1 ± 0.1 V |
|
|
|
|
|
|
|
AM | 990 kHz | 990 kHz |
| (fL): T302 | *1 |
Tracking |
|
|
|
|
|
|
|
|
|
| |
*1. Input: Antenna, Output: Speaker Terminal |
| ||||
*2. Input: Input is not connected, | Output: TP301 | ||||
• FM Detection
Signal generator: 10.7 MHz, FM sweep generator
Test | Frequency | Frequency | Setting/ | Instrument |
Stage |
| Display | Adjusting | Connection |
|
|
| Parts |
|
|
|
|
|
|
FM IF | 10.7 MHz | 98.0 MHz | T304(Turn | Input: Pin 1 of |
|
|
| the core of | IC301 |
|
|
| T304 fully |
|
|
|
| counter- |
|
|
|
| clockwise.) |
|
• FM RF
Signal generator: 1 kHz, 75 kHz dev., FM modulated
| Frequency | Frequency | Setting/ | Instrument |
|
| Display | Adjusting | Connection |
|
|
| Parts |
|
FM Band | — | 87.50 MHz | (fL): L303 | *1 |
Coverage |
|
| 3.4 ± 0.1 V |
|
|
|
|
|
|
FM RF | 98.00 MHz | 98.00 MHz | L302 | *2 |
| (10~30 db) |
|
|
|
|
|
|
|
|
• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency | Display | Adjusting | Instrument |
|
| Parts | Connection |
|
|
|
|
98.00 MHz | 98.00 MHz | VR351*1 | Input: SO301 |
(25±1 dBμV) |
|
| Output: Speaker |
|
|
| Terminal |
|
|
|
|
*1. Adjust so that an output signal appears.
• Check FM VT
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency | Display | Check Point | Instrument |
|
|
| Connection |
|
|
|
|
87.5 MHz | 87.5 MHz | 3.4 V ± 0.1 V | TP301 |
|
|
|
|
108 MHz | 108 MHz | 7.8 V ± 1.0 V | TP301 |
• Setting the Test Mode
Keeping the FF/PRESET UP button and MEMORY/SET button pressed, turn on
Preset No. | FM | Preset No. | AM | |
|
|
|
|
|
1 | 87.50 | MHz | 6 | 531 kHz |
2 | 108.00 | MHz | 7 | 1,602 kHz |
3 | 98.00 | MHz | 8 | 990 kHz |
4 | 90.20 | MHz | 9 | 612 kHz |
5 | 106.00 | MHz | 10 | 1,404 kHz |
|
|
|
|
|
FM TUNER PWB-A2 75
ANTENNASO301 OHMS GND AM
TERMINAL
*1. Input: Antenna, Output: TP301
*2. Input: Antenna, Output: Speaker Terminal
TP301 | IC301 | FM ANT. | |
| |||
| FM RF | ||
20 | 1 | ||
IC302 | L302 | ||
FM OSC. L303 |
| T302 | |
| AM | ||
FM Band | T304 | ||
Tracking fL | |||
Coverage fL | |||
FM IF |
| ||
VR351 |
| ||
|
| ||
FM Mute |
|
| |
Level |
|
| |
T351 |
| T306 | |
| AM Band | ||
AM IF | IC303 | ||
Coverage fL | |||
Figure 13-1 ADJUSTMENT POINTS
– 13 –
