Sansui 7900Z - Bias Current Adjustment; FM Intermediate Frequency Selection

4 :
}
:
9900Z/89002DB/790
3.
Bias
Current
Adjustment
(See
Fig.
4-4
&
Top
View
on
Page
18,
19
&
20)
7
3. For Adjustment, run the unit for more than 5 minutes
after the power is switched on.
Note: 1. Master Volume ..... - Minimum
2. Room Temperature 18°C ~ 28°C (65°F ~ 85°F)
STEP SUBJECT MEASURE OUTPUT ADJUST ADJUST FOR REMARKS
© Before turning ON
power switch, turn
jVR2 fully counter-
clockwise.
This bias current
value into voltage b
Ohms law. :
© 9900Z/8900ZDB
Between JP4 & emitter terminal kQ2 on F-3308
(As shown @) & ®) in Fig. 4-4)
e@ 7900Z
Between emitter terminals kQ12 & kQ13 on F-3407
Top of View on page 20)
1. | Bias Current
Adj. L-ch kVR1 (L-ch)
(F-3308)
kVR1 (L-ch)
(F-3407) |
(As shown €) &
© 9900Z/8900ZDB
Between JP1 & emitter terminal kQ2 on F-3308
(As shown©) & (D) in Fig. 4-4)
© 7900Z
Between emitter terminals kQ12 & kQ13 on F-3407
(As shown &(H) Top of View on page 20)
2. | Bias Current
Adj. R-ch kVRt1 (R-ch)
(F-3308)
KVR (R-ch)
(F-3407)
Fig. 4-4 (9900Z, 8900ZDB)
ape @ Selection Intermediate Frequencies (FM) @ Note on Photo-couplers Replacement
* When the intermediate frequency (shown by color) of the cera- * Unity the ranks of photo-couplers (fPH51, fPH52) on the F-3313
mic filter is changed, rewire between the terminal No. 58 or 59 with same color.
(F-3300) and the point (A) or (F-3298) in accordance with ~* When the rank (shown by color) of the photo-coupler is changed,
table 1. replace the Resistor (fR51) as shwon on the table 2.
Unify the color marks of FM ceramic filters (4CF1, dCF2, dCF3
and dCF4 (9900Z Only) ) on the F-3300 with same color.
* In 9900Z, when the FM ceramic filter is replaced with new
ceramic filter set (dCF1 ~ dCF4/Stock No. 07248600), use a
ceramic filter marked with J the dCF4 only.
© Table 2
LE Ne ee a a ea TE
*
Photo Coupler
(fPH51, fPH52) Resistor (fR51)
Stock No.
nee”
Coupling Rankings | Value (2)
@ Table 1
CHANGE OF COLOURING
(Intermediate Frequency)
330 00233200
WIRING
180
00229000
FROM TO ORANGE 100 00224800
82 00239300
RED Remove a wire between Terminal No. 58 or
WHITE
(10.750 MHz)
(10.700 MHz)
59 (F-3300) and Point @ (F-3298).
BLACK
(10.650 MHz)
Change_a connection of Point (A) to
Point () (F-3298).
RED
(10.700 MHz)
WHITE
(10.750 MHz)
Connect a wire of 10 inch between Terminal
No. 59 and Point @ (F-3298).
BLACK
(10.650 MHz)
Connect a wire of 10 inch between Terminal
No. 58 and Point () (F-3298).
BLACK
(10.650 MHz)
WHITE
(10.750 MHz)
Change _a connection of Point ® to
Point (A) (F-3298).
RED
(10.700 MHz)
Remove a wire between Terminal No. 58 or
59 (F-3300) and Point @®) (F-3298).
F-3298 (Conductor Side)
10