ICF-CD825RM - Sony Audio Service Manual (repair manual). Page 14

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The Test mode is used for board adjustment. In the Test mode, the
output of IC701 4 pin on the TX board varies.

Test Mode Setting Method:
1. Solder-bridge the TP-1 on the TX board (short IC701 2 pin

and 3 pin).

2. Apply the power (DC 3 V) to the set.
3. Short instantaneously the IC701 0 pin (RESET) on TX board

to the ground, so that the Test mode becomes active.

4. In the Test mode, the operation is as follows:

• Snooze data are sent successively, when

[SNOOZE/SLEEP OFF]

 button (S704) is pressed.

• Low (0 V) power is output, when 

[CD      ]

 button (S701) is

pressed.

• High (3 V) power is output, when 

[RADIO/SLEEP]

 button

(S702) is pressed.

• Low (0 V) is output or data transmission is stopped, when

[OFF/ALARM RESET]

 button (S703) is pressed.

Test Mode Releasing Method:
1. Turn the power OFF, then remove the solder bridge on TP-1

which was made in step 1 of Test Mode Setting Method.

2. Thus, the set can operate as usual.

^

Adjustment Method:
1. Set the Test mode.
2. Press the 

[RADIO/SLEEP]

 button (S702).

3. Adjust L703 so that the output level becomes maximum.
4. Adjust L704 so that the output level becomes maximum.
5. Adjust L708 so that the output level becomes maximum.
6. Repeat steps 3-5.

Adjustment Location: TX Board (See page 16)

Adjustment Method:
1. Set the Test mode.
2. Press the 

[RADIO/SLEEP]

 button (S702).

3. Adjust CT701 so that the output level becomes maximum.

Adjustment Location: TX Board (See page 16)

Power Source

(DC 3 V)

+3 V

+
–

GND

RESET

IC701

TP-1

TP-2

TP-3

[TX Board] (Conductor Side)

+
–

Spectrum analyzer or
modulation analyzer 
Input impedance 50 

Ω

TX Antenna terminal

TX Board

(RM-RW 1)

+
–

Spectrum analyzer or
modulation analyzer 
Input impedance 50 

Ω

TX Antenna terminal

TX Board

(RM-RW 1)

1 PF

Connect a capacitor 
having a small 
coupling loss.