Check Procedure (Handset); Preparation; Initial Power Tests - Panasonic KX-TCD725AXM Service Manual

9 CHECK PROCEDURE (HANDSET)

9.1.

PREPARATION

9.1.1. EQUIPMENT REQUIRED
• • DECT tester: Romde & Schwarz, CMD 60 is recommended.
• • Frequency counter: it must be precise to be able to measure 1Hz (precision;±4ppm).
Hewlett Packard, 53131A is recommended.
• • DC power: it must be able to output at least 1A current under 2.4V.
• • Digital multi-meter (DMM): it must be able to measure voltage and current.
• • Oscilloscope
9.1.2. JIGs AND PC
• • EEPROM serial JIGs
1. I2C PCB: PQZZTCD705BX
2. RS232C cable: PQZZ1CD705BX
3. Clip cable: PQZZ2CD705BX
4. DC cable: PQZZ3CD705BX
• • PC which runs in DOS mode.
• • Batch file for PC setting
9.2.

INITIAL POWER TESTS

1. Switch on the 2.4V supply.
2. Switch the handset on at the keypad.
3. Check for approx. 120mA current on the supply line for around 10s.
4. Check the 3.8V supply rail at TP11. It must be 3.8V ± 0.2V.
5. Check the 2.65V supply rail at the collector of transistor T6. It must be 2.65V ± 0.2V.
6. Switch off the 2.4V supply.
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