YIHUA Regulated DC Power Supply

Instruction Manual

Models: 1502USB/1502DD/1502DD+/1502D+

Important Safety Instructions

When using an electrical appliance, basic precautions are required to always be followed, including the following: Read all instructions before using.

DANGER - To reduce the risk of electric shock:

This appliance can be used by children aged from 8 years and above and persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning use of the appliance in a safe way and understand the hazards involved.
Children shall not play with the appliance.
Cleaning and user maintenance shall not be made by children without supervision.
If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or similarly qualified persons in order to avoid a hazard.
Do not leave the appliance unattended when it is switched on.
High voltage in machine, amateurs do not dismantle machine.
If the supply cord is damaged, it must be replaced by a special cord or assemble available from the manufacturer or its service agent.

I. Summary

The power supply is designed for mobile phones and BP machine maintenance. It features high-precision DC power supply protection, including speed, load over-current, and short-circuit protection. It has five different voltage output options (1502D+ and 1502USB excluded) and special features to facilitate maintenance for different mobile phones and BP machines. It includes a universal power supply output terminal and is suitable for laboratories, schools, and production lines.

II. Parameter Specification

Model	1502USB	1502DD	1502DD+	1502D+
Output Power	DC 0V~15V/0V~5V	DC 0V~15V	DC 0V~15V	DC 0V~15V/0V~5V
Supply Voltage	220V/110V ± 10% 50/60Hz
Operating Temperature	-10℃~40℃
Relative Humidity	<90%
Storage Temperature	-20℃~40℃
Storage humidity	<80%
Power stability	≤0.01% ± 2mV
Load Rated degrees	≤0.01% ±2mV (1mav <1A)
Ripple noise	≤ 0.5mvrms (5Hz-1MHz) lomax greater than 1A
Temperature Coefficient	≤300PPM/°C
Output Current	0~2A	0~2A	0~2A	0~2A
Overload current	2A	0.6~2A	0.6~2A	0.6~2A

III. Performance Comparison Table

Function	1502USB	1502DD	1502DD+	1502D+
Voltage display precision	0.1V	0.1V	0.1V	0.1V
Current display precision	10mA	10mA	10mA	10mA
Output voltage choice	DC 0V~15V/0V~5V	DC 0V~15V	DC 0V~15V	DC0V~15V/0V~5V
Mobile signal shows	Yes	No	Yes	No
PSP power supply function	Yes	No	No	No

IV. Instruction Manual

Front panel introduction

The front panel of the YIHUA DC Power Supply models (PS-1502DD, PS-1502D, 1502USB) features the following controls and indicators:

1. Current indicator
2. Voltage indicator
3. Output current adjust knob
4. Voltage gears adjust knob
5. Power switch
6. Output negative terminal
7. Grounding terminal
8. Output positive terminal
9. Voltage fine tuning knob
10. Voltage coarse tuning knob
11. PHS/CDMA switch knob (specific models)
12. USB interface
13. Mobile phone RF signal indicator
14. Voltage adjust knob

Dedicated output connections

Diagram shows connections for various output terminals.

Use in

For maintenance of NOKIA, MOTOROLA, LG, Lenovo, Sony Ericsson, and other brand mobile phones, and BP machines. Adjust the voltage and overload protect current according to the mobile phone's requirements. Do not set the current too high to prevent damage to the phone.

V. Warning

Must set the output voltage and current properly before connecting the mobile phone. Do not adjust the voltage, current, or output pressure incorrectly, as this may burn the mobile phone.
The power supply is not designed for continuous full-load operation for extended periods. Control your utilization rate to be less than 60% to prevent premature failure. When ordering, consider the actual operating current and include an allowance.

VI. PSP Power Supply Function

The 1502USB model includes a PSP power supply function. It features a square USB port on the back panel and a flat-shaped USB port on the front panel. Use a separate USB data cable to connect the rear panel USB port to a host machine (computer) and the front panel USB port to the mobile phone to complete the PSP function. This allows the power supply to provide power and data transfer functions for the mobile phone.

VII. Maintenance

Fuse Replacement: If the fuse is blown and the LED indicator does not light up, the DC power supply will stop working. Identify the cause of the fuse failure and replace it.
Operating Environment: Do not operate in environments exceeding 40°C. Ensure the radiator in the rear equipment and the back of the chassis have sufficient space for cooling.
Calibration: The DC power supply is precisely adjusted at the factory. To avoid affecting the machine's precision, do not adjust the circuit parameters.

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