Sony SRF-QT1 User manual

SRF-QT1
E Model SERVICE MANUAL
FM STEREO RADIO
MICROFILM
SPECIFICATIONS
Frequency range: FM 87.5 – 108 MHz
Output: i(headphones) jack
(ø 3.5 mm stereo minijack)
Power output: 1.5 mW + 1.5 mW
(at 10 % harmonic distortion)
Power requirements: 1.5 V DC, one R03 (size AAA) battery
Dimensions: Approx. 49.8 ×64.8 ×26.0 mm (w/h/d)
(2 ×2 5/8×1 1/16 inches) not incl.
projecting parts and controls
Mass: Approx. 50 g (1.8 oz) incl. a battery and
headphones
Accessories supplied: Stereo headphones (1)
Carrying pouch (1)
Design and specifications are subject to change without notice
Ver 1.0 1999. 12

Thissectionis extractedfrom
instruction manual.
SECTION 1
GENERAL
1. GENERAL .......................................................................... 2
2. DISASSEMBLY
2-1. Lid, Battery Case................................................................... 3
2-2. Cabinet (Front), Knob (Tune) ............................................... 3
2-3. Main Board ........................................................................... 4
3. ELECTRICAL ADJUSTMENT .................................... 5
4. DIAGRAMS
4-1. Printed Wiring Board — Main Board — .............................. 7
4-2. Schematic Diagram — Main Board — ................................. 9
5. EXPLODED VIEWS ...................................................... 11
6. ELECTRICAL PARTS LIST ....................................... 12
— 2 —

— 3 —
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
• The equipment can be removed using the following procedure.
2-2. CABINET (FRONT), KNOB (TUNE)
Lid ,Battery Case Cabinet (Front), Knob (Tune) Main Board
Set
2 Two screws (B1.7 × 8)
1 Slide Lid, Battery Case in
the direction of the arrow.
6 Screw (P1.7 × 2.5)
claw
two claws
7 Knob (Tune)
claw
5 Knob (Power)
3 Release from the claw.
4 Remove the Cabinet (Front)
in the direction of the arrow.
2 Release them
from the two claws.
1 Release from the claw.
108
88
96
2-1. LID, BATTERY CASE

— 4 —
2-3. MAIN BOARD
2 Remove the MAIN board
in the direction of the arrow.
1 Remove the leads at the two
points of battery terminals
(+)/(-) by unsoldering.
Lead wire (white)
Lead wire (red)

SRF-QT1
— 5 — — 6 —
• Repeat the procedures in each adjustment several times.
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1 86.5MHz
CT1 109.5MHz
FMVCO Adjustment
Procedure :
1. Connect frequency counter to the positions shown below.
2. Tune the set to 98 MHz.
3. Adjust L4 so that the value of the frequency counter reading
becomes 38 kHz.
Specification Value :
Frequency counter
37.95 – 38.05 kHz
0dB=1µV
Adjustment Location: MAIN board (Side B)
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L6 86.5MHz
CT2 109.5MHz
SECTION 3
ELECTRICAL ADJUSTMENT
0.01 µ F
FM RF signal
generator
to ANT (TP6)
75kHz (100%) amplitude modulation
by 1kHz signal.
Output level :as low as possible
16 Ω
Set +
–
Level mete
r
Headphones jack (J1)
0.01 µ F
FM RF signal
generator
to ANT (TP6
)
Carrier frequency : 98MHz
Modulation : no modulation
Output level :0.1V (100dB)
Frequency counte
r
1 µ F+
–
100k Ω
TP9
TP (GND)
TP8
10
µ F
SECTION 4
DIAGRAMS
• IC BLOCK DIAGRAMS
IC1 CXA1129N
IC3 LA4535M
Note on PrintedWiring Board:
•X: parts extracted from the conductor side.
•: parts extracted from the component side.
•a:Through hole.
•b: Pattern from the side which enables seeing.
Caution:
Pattern face side: Partsonthepattern face side seenfrom
(SIDE A) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(SIDE B) theparts face are indicated.
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ωand 1/4W or less unless otherwise
specified.
•C: panel designation.
•U: B+ Line.
•H: adjustment for repair.
• Powervoltageis dc1.5 Vandfedwith regulated dcpower
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
• Voltagesare taken with aVOM(Inputimpedance 10MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
F: FM
FM 2nd OSC Adjustment
Procedure :
1. Connect frequency counter to the positions shown below.
2. Tune the set to 98 MHz.
3. Adjust L2 so that the value of the frequency counter reading
becomes 57.1 MHz.
Specification Value :
0.01 µ F
FM RF signal
generator
to ANT (TP6
)
Carrier frequency : 98MHz
Modulation : no modulation
Output level :0.1V (100dB)
Frequency counte
r
1 µ F+
–
100k Ω
TP10
TP (GND)
TP8
10
µ F
Frequency counter
56.85 – 57.35 MHz
L2 (Side A)
FM 2nd OSC
adjustment
L4
FM VCO
adjustment
L6
FM frequency coverage adjustment
CT2
FM frequency
coverage adjustment
CT1
FM tracking
adjustment
L1
FM tracking
adjustment
CV1
1
30
15
16 TP
(GND)
TP (GND) TP9
10
1
6
5
TP6 TP10
IC3
IC1
TP8
12 6 8
FM/TV
RF AMP
FM/TV
MIX
FM/TV
1ST LOCAL
OSC
AFC
AM
RF AMP
OVER LOAD
AGC
MIX
1
MIX
2
PSN
1
PSN
2
AGC
AF AMP
LPF
DETUNE
DET
FM
LPF
AM
BPF
LOCAL
OSC
1/2
COUNTER
FM/TV
SELECT
FM
DISCRI
FM
LIMITTER
AMP
AM IF AMP
(FM TUN IND)
AM
DET
AGC
TUNING
IND
VCO
MUTE
SEP
CONTROL
ST.
DECORDER
INPUT
BUFF
VCO
LEVEL
CONTROL
BUFF
AMP
DC
AMP
PD
SYNC
DET
R CH
AMP
L CH
AMP
LOAD
SELECT
1/2
COUNTER
FM/AM
SELECT
M/ST.SW
ST.IND
FM/TV
30 29 25 24 232628 27 22 20
345 7 9 10 11 12 13 14 15
1617181921
FM/AM
FM/TV 38KHz
0
π/2
FM/TV
FM/AM
19KHz
π/2
19KHz
0
38KHz
FM IN TV IN NC FM RF GAIN ADJ OL AGC 2ND OSC AM OSC TUN IND PLL1 PLL2 VCO OSC VCO CONT R OUT L OUT
ST IND
PD2 PD1
MPX IN
DET OUT
MUTE
AGC2
NC
FM IF
NC
TV OSC
FM OSC
AGC1
AM IN
NC
POWER
SWITCH MUTE
BIAS
AMP
AMP
1
2
3
4
5 6
7
8
9
10 MUTE
R-OUT
GND
L-OUT
VCC
PWR
R-IN
GND
L-IN
REG

SRF-QT1
4-1. PRINTEDWIRING BOARD • Refer to page 6 for Note on PrintedWiring Board.
— 7 — — 8 —
MAIN BOARD (SIDE A) MAIN BOARD (SIDE B)
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION)
R03
1PCS, 1.5V
S1
(POWER)
ON
OFF
C8
L2
L6
TP9
L1
RV1
VOL
CV1
Tuning
1-676-431 11
(11) 1-676-431 11 (11)
CT1
CV1-2CV1-1
CT2
TP6
TP10
TP
(GND)
TP
(GND)
J1
10 6
51
115
1630
TP8
12
A
B
C
D
E
345678

SRF-QT1
4-2. SCHEMATIC DIAGRAM • Refer to page 6 for Note on Schematic Diagram and IC block diagrams.
— 9 — — 10 —
+
""
Tuning

— 11 —
SECTION 5
EXPLODEDVIEWS
NOTE:
• -XX, -X mean standardized parts, so they may
have some differences from the original one.
• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delayshould be anticipatedwhen orderingthese
items.
• Themechanical partswith noreference number
in the exploded views are not supplied.
• Hardware (# mark) list and accessories and
packing materials are given in the last of this
parts list.
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
1 3-318-203-21 SCREW(B1.7X8), TAPPING
2 3-041-670-01 LID,BATTERY CASE (BLUE)
2 3-041-670-11 LID,BATTERY CASE (GREEN)
2 3-041-670-21 LID,BATTERY CASE (WHITE)
2 3-041-670-31 LID,BATTERY CASE (PINK)
3 3-041-673-01 TERMINAL (+), BATTERY
4 3-041-671-01 KNOB(POWER) (BLUE)
4 3-041-671-11 KNOB(POWER) (GREEN)
4 3-041-671-21 KNOB(POWER) (WHITE)
4 3-041-671-31 KNOB(POWER) (PINK)
5 3-041-667-01 CABINET (FRONT) (BLUE)
5 3-041-667-11 CABINET (FRONT) (GREEN)
5 3-041-667-21 CABINET (FRONT) (WHITE)
5 3-041-667-31 CABINET (FRONT) (PINK)
6 3-041-669-01 PLATE, TRANSPARENT
7 3-044-855-01 SHEET, ADHESIVE
8 7-627-552-07 SCREW,PRECISION +P 1.7X2.5
9 3-041-672-41 KNOB(TUNE) (BLUE)
9 3-041-672-51 KNOB(TUNE) (GREEN)
9 3-041-672-61 KNOB(TUNE) (WHITE)
9 3-041-672-71 KNOB(TUNE) (PINK)
10 A-3663-442-A MAIN BOARD, COMPLETE
11 7-624-104-04 STOPRING 2.0, TYPE -E
12 3-041-676-01 RING, KEY
13 3-041-674-01 TERMINAL (-), BATTERY
14 3-041-668-41 CABINET (REAR) (BLUE)
14 3-041-668-51 CABINET (REAR) (GREEN)
14 3-041-668-61 CABINET (REAR) (WHITE)
14 3-041-668-71 CABINET (REAR) (PINK)
1
2
3
4
5
67
8
9
10
11
12
13
14
• Color Indication ofAppearance Parts Example:
KNOB, BALANCE (WHITE) . . . (RED)
↑ ↑
Parts of Color Cabinet’s Color

— 12 —
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
SECTION 6
ELECTRICAL PARTS LIST
NOTE:
• Due to standardization, replacements in the
parts list may be different from the parts
specifiedinthe diagramsor the components
used on the set.
• -XX, -X mean standardized parts, so they
may have some difference from the original
one.
• Items marked “*” are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when
ordering these items.
• CAPACITORS:
uF: µF
• RESISTORS
All resistors are in ohms.
METAL: metal-film resistor
METAL OXIDE: Metal Oxide-film resistor
F: nonflammable
• COILS
uH: µH
• SEMICONDUCTORS
In each case, u: µ, for example:
uA...: µA... , uPA... , µPA... ,
uPB... , µPB... , uPC... , µPC... ,
uPD..., µPD...
A-3663-442-A MAIN BOARD, COMPLETE
*********************
< CAPACITOR >
C1 1-163-233-11 CERAMIC CHIP 18PF 5.00% 50V
C2 1-135-181-21 TANTALUM CHIP 4.7uF 20% 6.3V
C3 1-162-927-11 CERAMIC CHIP 100PF 5% 50V
C6 1-115-156-11 CERAMIC CHIP 1uF 10V
C7 1-165-128-11 CERAMIC CHIP 0.22uF 16V
C8 1-136-683-11 FILM 0.0056uF 5.00% 100V
C9 1-165-128-11 CERAMIC CHIP 0.22uF 16V
C10 1-164-227-11 CERAMIC CHIP 0.022uF 10% 25V
C11 1-164-227-11 CERAMIC CHIP 0.022uF 10% 25V
C12 1-164-346-11 CERAMIC CHIP 1uF 16V
C13 1-163-085-00 CERAMIC CHIP 2PF 50V
C14 1-163-104-00 CERAMIC CHIP 30PF 5% 50V
C15 1-126-209-11 ELECT CHIP 100uF 20.00% 4V
C16 1-164-346-11 CERAMIC CHIP 1uF 16V
C17 1-164-346-11 CERAMIC CHIP 1uF 16V
C18 1-135-181-21 TANTALUM CHIP 4.7uF 20% 6.3V
C19 1-164-346-11 CERAMIC CHIP 1uF 16V
C20 1-135-201-11 TANTALUM CHIP 10uF 20% 4V
C21 1-164-346-11 CERAMIC CHIP 1uF 16V
C22 1-115-156-11 CERAMIC CHIP 1uF 10V
C23 1-115-156-11 CERAMIC CHIP 1uF 10V
C33 1-164-156-11 CERAMIC CHIP 0.1uF 25V
C34 1-164-156-11 CERAMIC CHIP 0.1uF 25V
C35 1-126-206-11 ELECT CHIP 100uF 20% 6.3V
C36 1-126-206-11 ELECT CHIP 100uF 20% 6.3V
C37 1-126-246-11 ELECT CHIP 220uF 20% 4V
C38 1-164-156-11 CERAMIC CHIP 0.1uF 25V
C39 1-162-927-11 CERAMIC CHIP 100PF 5% 50V
C40 1-162-927-11 CERAMIC CHIP 100PF 5% 50V
C41 1-124-778-00 ELECT CHIP 22uF 20% 6.3V
C43 1-164-357-11 CERAMIC CHIP 1000PF 5.00% 50V
C44 1-162-927-11 CERAMIC CHIP 100PF 5% 50V
C45 1-164-156-11 CERAMIC CHIP 0.1uF 25V
< VARIABLE CAPACITOR >
CV1 1-141-537-11 CAP, VAR 20PF (Tuning)
< TRIMMER >
CT1 1-141-537-11 CAP, VAR 20PF
< DIODE >
D1 8-719-800-76 DIODE 1SS226
< IC >
IC1 8-752-061-76 IC CXA1129N-T4
IC3 8-759-802-80 IC LA4535M
< JACK >
J1 1-764-624-11 JACK (HEADPHONES)
< COIL >
L1 1-411-769-11 COIL, AIR-CORE
L4 1-409-971-11 COIL (VCO)
L6 1-409-990-11 COIL, AIR-CORE
L7 1-412-987-31 INDUCTOR 4.7uH
L8 1-412-947-11 INDUCTOR 4.7uH
L9 1-412-947-11 INDUCTOR 4.7uH
L10 1-412-987-31 INDUCTOR 4.7uH
< RESISTOR >
R1 1-216-813-11 METAL CHIP 220 5% 1/16W
R2 1-216-821-11 METAL CHIP 1K 5% 1/16W
R3 1-216-795-11 RES-CHIP 6.8 5% 1/16W
R11 1-216-789-11 METAL CHIP 2.2 5% 1/16W
R14 1-216-821-11 METAL CHIP 1K 5% 1/16W
R15 1-216-821-11 METAL CHIP 1K 5% 1/16W
R16 1-216-821-11 METAL CHIP 1K 5% 1/16W
R17 1-216-821-11 METAL CHIP 1K 5% 1/16W
R18 1-216-801-11 METAL CHIP 22 5% 1/16W
R19 1-216-801-11 METAL CHIP 22 5% 1/16W
< VARIABLE RESISTOR >
RV1 1-225-467-11 RES, VAR, CARBON 30K/30K (VOL)
< SWITCH >
S1 1-572-922-11 SWITCH, SLIDE (POWER)
****************************************************************
ACCESSORIES & PACKING MATERIALS
********************************
3-042-459-01 CASE, CARRYING
3-042-460-01 HOLDER, KEY
3-042-654-11 MANUAL, INSTRUCTION
(ENGLISH,SPANISH,KOREAN,CHINESE)
8-953-301-94 RECEIVER,EAR MDR-E805LP/K4 SET
MAIN
SRF-QT1
Sony Corporation
Personal Audio Division Company 1999L1625-1
Printed in Japan ©1999.12
Published by General Engineering Dept.
9-927-625-11