Brand: SANYO
Category: Phone
Document Type: Parts/Service
Language: EN
Parts/Service for CLT-138X
Uploaded: Nov. 21, 2025, 6:12 p.m.
Warranty Information
No specific warranty period is mentioned in this service manual.
Remote Unit Adjustment
- Tx/Rx VCO & Tx Freq: Align T253 (Tx) for 2.2V, T153 (Rx) for 1.5V, and confirm Tx Freq is 40.000MHz ±1.2KHz.
- Tx Level: Maximize Tx power to +5dBm±3dBm.
- Tx Modulation: Align VR651 for 2.0±0.1KHz deviation for 1KHz input, with specific deviations for 300Hz and 3KHz. Tx Data modulation should be 3.8±1.0KHz deviation.
- Rx IF: Align T351 for maximum deflection and minimum distortion.
- Rx AF Level: Align VR351 for 44mV±5mV speaker output (normal volume) and check outputs for different frequencies and volume settings.
- Rx RF: Confirm distortion is less than 10% (SINAD 20dB) when reducing FM SSG output.
- CD Level Check: Confirm CD output levels are High/Low under varying FM SSG input.
- Batt. Low: Check Batt. Low output for High/Low levels based on DC Power Supply input.
Base Unit Adjustment
- Tx/Rx VCO & Tx Freq: Align T201 (Tx) for 2.5V, T103 (Rx) for 1.5V, and confirm Tx Freq is 30.300MHz ±1.2KHz.
- Tx Level: Obtain maximum power obtainable (+5dBm±3dBm).
- Tx Modulation: Align VR601 for 1.7±0.10KHz deviation for 1KHz input, with specific deviations for 300Hz and 3KHz. Tx Data modulation should be 3.8±1.0KHz deviation.
- Rx IF: Align T301 for maximum deflection and minimum distortion.
- Rx RF: Align T101 for minimum distortion (less than 10%).
- Rx AF Level: Align VR301 for -5dBm±0.5dBm output, with specific outputs for 300Hz and 3KHz.
- CD Level Check: Confirm CD output levels are High/Low under varying FM SSG input.
Troubleshooting and error codes
| STEP | CONDITION | CH | ADJUST | ADJUSTED VALUE | SPECIFICATION |
|---|---|---|---|---|---|
| 1. IF | SSG Output: 46dB μV | 6 | T351 | Minimum Distortion | Less than 5% |
| 2. RF | SSG Output: +5dB μV | 6 | NONE | NONE | Less than 10% |
| 3. AF LEVEL (Vol. normal) | (1KHz) | 6 | VR351 | 50mV | 44mV±5mV |
| (300Hz) | 6 | NONE | NONE | 50~95mV | |
| (3KHz) | 6 | NONE | NONE | 10~18mV | |
| 4. AF LEVEL (Vol. High) | (1KHz) | 6 | NONE | NONE | 50~95mV |
| 5. CD Level check (Tx PO OFF) | 0→+18dB μV | 6 | NONE | NONE | CD OUT:High Low |
| 0→+4dB μV | 6 | NONE | NONE | CD OUT:High High | |
| 6. Batt. Low | DC Level:3.50V | 6 | NONE | NONE | Batt. Low Out:High |
| DC Level:3.05V | 6 | NONE | NONE | Batt. Low Out:Low |