HCD-RV900D, MHC-RV900D - Sony Audio Service Manual (repair manual). Page 20

20

Procedure:
1.

Supply a 25 dB 98 MHz signal from the ANTENNA terminal.

2.

Tune the set to 98 MHz.

3.

Adjust RV11 to the point (moment) when the TUNED indicator
will change from going off to going on.

Adjustment Location: MAIN board

Procedure:
1.

Supply a 60 dB

  

98 MHz signal from the ANTENNA terminal.

2.

Tune the set to 98 MHz.

3.

Measure voltage between pin 22 and pin 3 of IC 11.  Adjust
T11 ubtil the voltage becomes 0 V.

Adjustment Location: MAIN board

FM RF SSG

75 

Ω

 coaxial

Carrier frequency : 98 MHz
Modulation           : AUDIO 1 kHz, 75 kHz
                              deviation (100%)
Output level          : 25 dB  (at 75 

Ω

 open)

FM ANTENNA terminal
(TM1)

set

Ω

Ω 

T11

NULL

RV11

FM TUNED LEVEL

1

12

24

13

IC11

TM1

IC1104

       RFMON signal waveform

• Standard value

DVD

TDV-520CSO

1.09 

± 0.2 Vp-p

(J-2501-236-A)

CD

LUV-P01

1.05 

± 0.2 Vp-p

(4-999-032-01)

VOLT/DIV: 200 mV
TIME/DIV: 500 ns 

RFMON level

After parts related to the servo circuit (RF amplifier (IC001), DSP
(IC509), motor driver (IC501), EEPROM (IC203) so on) are
replaced, re-adjusting the servo circuit is necessary. Select “ALL”
at    “1. DRIVE AUTO ADJUSTMENT” (Refer to page 3
(SUPPLEMENT-1) in TEST MODE) and adjust DVD-SL (single
layer), CD and DVD-DL (dual layer).

Perform a RFMON level check before exchanging optical pick-up.

Measurement Point: MB board CN501

17 pin (RFMON) — 1 pin (AGND)