Sony WRR-805A, Service Manual

Page: 26 / 54

3-6 WRR-805A (CE, AU)
(5) Turn ON the WRR-805A POWER switch (S501).
(6) Release (open) the jumper wire from the TP604 (land)
on the MB-861 board (A side), and check that the
following indication on the LCD appears as follows :
LCD display : “C 1 x x”
x x : About 3D to 58 (Hexadecimal)
(7) Change the FREQUENCY of the signal generator as
follows :
FREQUENCY (carrier frequency)
CE62 model : 806.000 MHz
CE69 model : 858.000 MHz
AU66 model : 799.000 MHz
(8) Short-circuit between TP604 (land) on the MB-861
board and GND (battery “ _ ” terminal)with a jumper
wire.
(9) Release (open) the jumper wire from the TP604 (land) on
the MB-861 board (A side) , and check that the
following indication on the LCD appears as follows :
LCD display : “C 2 x x”
x x : FAbout 3D to 58 (Hexadecimal)
(10)Change the FREQUENCY of the signal generator as
follows :
FREQUENCY (carrier frequency)
CE62 model : 811.000 MHz
CE69 model : 861.000 MHz
AU66 model : 804.000 MHz
(11)Short-circuit between TP604 (land) on the MB-861
board and GND (battery “
_
” terminal)with the jumper
wire.
(12) Release (open) the jumper wire from the TP604 (land)
on the MB-861 board (A side) , and check that the
following indication on LCD appears as follows:
LCD display : “C 3 x x”
x x : About 3D to 58 (Hexadecimal)
(13)Short-circuit between TP604 (land) on the MB-861
board and GND (battery “
_
” terminal) with the jumper
wire.
The WRR-805A Power is automatically turned OFF
and then ON.
3-2-4. S/N Checking
Equipment and Tools Required
DC power supply :
+
3.00 Vdc
±
0.02 V
Signal generator
Function generator
Audio analyzer with A-weighted filter
Mic amp (Noise mete)
Oscilloscope
MM-SMA conversion connector (Part No. J-6402-480-A)
SMA-BNC conversion connector (Part No. J-6402-490-A)
AF Input/Output cable (Sony K-1334 or equivalent)
Connection
MB-861 board (B side)
_
+
Signal
generator
Antenna input (J101)
Function
generator
Osilloscope
Mic amp
Audio
analyzer
(with A-weighted filter)
OUTPUT
AF Input/Output cable
NM - SMA conversion connector
with SMA - BNC conversion connector