Sony wm f 707 service manual

Page 2

WM - F707

SECTION 1
SERVICING NOTE

This set detects reel rotation by PH701 (photo sensor). FF/REW mode

Reel rotation cannot be detected when the main board is 1) Apply the square wave signal to the PH701

removed, because PH701 is mounted on the main board. 2) Press the « or » key,

As a result, the auto-off circuit and tape end detection

will misoperate. And. up and down of head and power PLAY mode

supply of playback circuit cannot operate when the main 1) Apply the square wave signal to the PH701.
board is removed. because S702 (head switch) is mounted 2) Press the (a)

to the main board (S702 is linked to on and off of the 3) Turn on $702 afew seconds later.

plunger solenoid.)

Therefore. operation check of the mechanism deck and
voltage check can be performed by the method shown
below.

-MAIN Board (side A) - -MAIN Board (side B) -

SQUARE WAVE
OSCILLATOR

® 20 Hz

0 dB (V)
(1V)