Sony HCD-H77 - Record Bias and Level Adjustments

Record Bias Adjustment
Procedure:
1. record mode
AF OSC blank tape
CS-122
e attenuator
Of pe
oO o
VIDEO/AUX (HCD-H70)
PHONO (HCD-H66/H77/H1200/H1400)
1) 315Hz
or rari } AGmV (—24.5dB)
2. playback mode
recorded VTVM
portion
DOLBY OUT TP701
Confirm playback the signal recorded in step 1 become
adjustment level as follows.
If these levels do not adjustment level, adjustment the RV42B
(deck A) and RV62B (deck B) to repeat step 1 and 2.
Adjustment level: Playback output of 315Hz to playback
output of 10kHz: —0.5dB to 0.5dB
Adjustment Location : MD-B board
HCD-H66/H70/H77/H1200/H1400
Confirm playback the signal recorded in step become adjust-
ment level as follows.
If these levels do not adjustment level, adjustment the RV701
(deck A) and RV751 (deck B) to repeat step 1 and 2.
Adjustment Level:
LINE OUT level: —6+0.5dB (0.37 to 0.41V)
Adjustment Location : main board
Adjustment Location :
mechanism deck—rear side—
TAPE HIGH SPEED
adjustment resistor (H)
TAPE NORMAL SPEED
adjustment resistor (L)
motors
deck A: M1
deck B: M2
RV62B :
RECORD BIAS ADJ
(R-CH) '
!
RV61A, B !
(R-CH)
|
PLAYBACK LEVEL ADJ
Ro
4
| eae
RV41A, B
(L-CH)
PLAYBACK LEVEL ADJ
RV42B deck A: MD-A board
Record Level Adjustment RECORD BIAS ADJ deck B: MD-B board
(L-CH)
Procedure :
1. record mode
AF
OSC
pe
a
main
board
—component
side—
ee)
RECORD
LEVEL
ADJ
attenuator —$—$——
AE
aeepaeer
RV751,
RV701
Il_o00 | (R-CH) (L-CH)
VIDEO/AUX (HCD-H70)
PHONO (HCD-H66/H77/H1200/H1400)
315Hz, 0.46V (—4.5dB)
2. playback mode
recorded VTVM
TB1
ANTENNA
test pin
TP701
DOLBY OUT
J701
DOLBY OUT TP701
VIDEO/AUX
(HCD-H70)
PHONO
(HCD-H66/H77/
H1200/H1400) 10604 = 10201
test pin
TP601
TEST MODE