Sony HCD-DP900D, Service Manual, Page: 19 / 102

19
HCD-DP900D
4. Mode: Record
5. Mode: Playback
6. Confirm playback the signal recorded in step 3 become
adjustable level as follows.
If these levels do not adjustable level, adjustment the RV301
(L-CH) and RV351 (R-CH) on the MAIN board to repeat steps
4 and 5.
Adjustable level:
CN301 PB level: 33.4 to 37.5 mV (–27.3 to –26.3 dB)
Adjustment Location: MAIN board
[MAIN BOARD] (Component Side)
[LEAF SW BOARD] (Component Side)
set
MD/VIDEO (AUDIO) IN
315 Hz, 50 mV (–23.8 dB)
blank tape
CS-123
600
Ω
attenuator
AF OSC
+
–
set
recorded
portion
CN301 (Pin
3
: L-CH)
(Pin
1
: R-CH)
level meter
TAPE SPEED
RV1002
RV1001
(NORMAL) (HIGH)
CN1001
         
CN301
RV354 RV304
RV351
CN304
T11
RV11
RV302
RV301
RV303
REC LEVEL (L)
(B)
PB LEVEL (L)
(A)
PB LEVEL (L)
(B)
REC LEVEL (R)
(B)
REC BIAS (R)
(B)
REC BIAS (L)
(B)
FM Tuned Level Adjustment
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
Null Adjustment
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
Adjustment Location
[MAIN BOARD] Component side
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
FM RF SSG
75
Ω
coaxial
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 60 dB (at 75
Ω
open)
FM ANTENNA terminal
(TM1)
set
CN301
RV354 RV304
RV351
CN304
T11
RV11
IC11
12
1
13 24
RV302
RV301
RV303
NULL
FM TUNED LEVEL