Record Bias Current Adjustment; Record Level Adjustment; Adjustment Location: Main Board - Sony HST-471 Service Manual

Record bias Current Adjustment

Procedure:
1. Mode: Record
CD IN connector (L: L-CH)

1) 315 Hz

50 mV (–23.8 dB)
2) 10 kHz

AF OSC
600 Ω
attenuator
2. Mode: Playback
recorded
portion
rear panel
set
VIDEO1
AUDIO OUT connector
(L: L-CH)
(R: R-CH)
Confirm playback the signal recorded in step 1 become adjustable
limits as follows.
If these levels do not adjustable limits, adjustment the RV341 (L-
CH) and RV441 (R-CH) on the AUDIO board to repeat steps 1 and 2.
Adjustable limits: Playback output of 315 Hz to playback output
of 10 kHz: ±0.5 dB
Adjustment Location: AUDIO and main boards
Record Level Adjustment DECK B
Procedure:
1. Mode: Record
CD IN connector (L: L-CH)
315 Hz, 50 mV (–23.8 dB)
AF OSC
600 Ω
attenuator
2. Mode: Playback
recorded
portion
rear panel
set
VIDEO1
AUDIO OUT connector
(L: L-CH)
(R: R-CH)
Confirm playback the signal recorded in step 1 become adjustable
limits as follows.
If these levels do not adjustable limits, adjustment the RV511 (L-
CH) and RV521 (R-CH) on the main board to repeat steps 1 and 2.
Adjustable limits:
CN207 PB level: 47.3 to 53.1 mV (–24.3 to –23.3 dB)
DECK B
(R: R-CH)
blank tape
CS-123
rear panel
set
level meter
+
–
(R: R-CH)
blank tape
CS-123
rear panel
set
level meter
+
–

Adjustment Location: main board

[MAIN BOARD] (Component Side)
J301
IC303
J302
CN361
[AUDIO BOARD] (Conductor Side)
RECORD
BAIS
R
RV301 L
RV401 RV441 RV341
R
PB LEVEL
— DECK B —
— 6 —
IC501
RV521
CN321
CN363
TAPE SPEED
L
(NORMAL)
RV651
RV311
PB
RV411
LEVEL
— DECK A —
RV511
CN317
(HIGH)
RV652
L
R